JPH11234543A - Video camera equipment - Google Patents

Abstract

(57) [Problem] To provide a function of detecting that dirt is attached to a lens of a video camera and outputting a message urging the user to clean the lens, thereby preventing recording failure. In addition, this is realized with a simple configuration at the lowest possible cost. SOLUTION: An MPEG2 encoding process is monitored, and a fixed pattern in a sample image is detected based on a level of a predetermined low frequency component of image data corresponding to lens contamination and a motion detection process. Then, based on the detected level of the predetermined low frequency component and the state of the fixed pattern, the presence or absence of dirt on the lens is detected, and if an affirmative result is obtained, a message urging the cleaning of the lens is output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera device.

[0002]

2. Description of the Related Art At present, portable video cameras in which an image pickup device such as a camera and a video deck capable of recording and reproducing video and audio are integrated have been widely used.

[0003]

[Problems to be solved by the invention]

In such a video camera, if dirt such as dust or fingerprints adheres to the imaging lens, it is natural that the recorded image is not affected by the dirt on the lens and good image quality cannot be obtained. . For this reason, if it is important to always record a good image, the user should always directly check whether the lens is clean when recording, and if dirt is present, clean the lens frequently. It is necessary to keep.

[0005] However, such a work is apt to be forgotten, and unless it is very dirty, a viewfinder or a display section on which a monitor image is being displayed is displayed so that the user can clearly recognize it. Is invisible to you. For this reason, the user may naturally take a picture without noticing the dirt on the lens. In such a case, if there is a chance to display the recorded image on a monitor having a relatively large screen at that time, only then can the lens stain remain on the image in a spot-like state. May be confirmed. In this case, the user feels that the recording has failed due to dirt on the lens.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in consideration of the above-described problems, and has been made to provide a function capable of notifying that a lens is dirty in a video camera. An object of the present invention is to prevent a recording failure caused by an error. In order to achieve the above-mentioned object, it is preferable that the object is realized by a configuration as simple as possible.

For this reason, an optical system having a lens means for obtaining a picked-up image light and a required signal processing including a compression encoding process as a signal processing for image data obtained based on the picked-up image light can be performed. Image signal processing means, recording means capable of recording image data subjected to signal processing by the image signal processing means on a predetermined recording medium, and a predetermined signal processing result executed by the image signal processing means. A dirt discriminating means for discriminating whether or not dirt has adhered to the lens means, and a message in a predetermined output form when the dirt discriminating means determines that dirt has adhered to the lens means. And a message output means for outputting a message.

According to the above arrangement, it is possible to output a message by detecting that dirt has adhered to the lens. At this time, it is determined whether or not dirt has adhered to the lens. Is performed by using a signal processing operation of a signal processing circuit system for performing required signal processing including image compression encoding processing on the image data.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A video camera according to an embodiment of the present invention will be described below. The recording / reproducing device section mounted on the video camera of the present embodiment adopts a configuration for recording and reproducing data corresponding to a so-called mini disk, which is known as a kind of magneto-optical disk. The description will be made in the following order. 1. Disk format 2. 2. External configuration of video camera 3. Internal configuration of video camera 4. Configuration of media drive section 5. Overview of lens dirt detection and message output 6. Detection method of lens dirt Processing operation

[0010] 1. Disc Format The recording / reproducing device section mounted on the video camera of this example is assumed to be compatible with a format called MD data, which records / reproduces data in correspondence with a mini disc (magneto-optical disc). . As this MD data format, two types of formats called MD-DATA1 and MD-DATA2 have been developed, but the video camera of this example is capable of recording at higher density than MD-DATA1. It is assumed that recording and reproduction are performed in accordance with the format. So first, MD
-Disc format of DATA2 will be described.

FIGS. 1 and 2 conceptually show an example of a track structure of a disk as MD-DATA2. FIGS. 2A and 2B are a cross-sectional view and a plan view, respectively, showing an enlarged portion enclosed by a broken line A in FIG. As shown in these figures, two types of grooves (grooves) are previously formed on the disk surface: a wobbled groove WG provided with wobbles (meandering) and a non-wobbled groove NWG provided with no wobble. It is formed. The wobbled groove WG and the non-wobbled groove NWG
Exist in a double spiral on the disk so as to form a land Ld therebetween.

In the MD-DATA2 format, the land Ld is used as a track. Since the wobbled groove WG and the non-wobbled groove NWG are formed as described above, the track Tr.A is used as the track. , Tr and B are independently formed in a double spiral (double spiral) shape. The track Tr · A is a track in which the wobbled groove WG is located on the outer peripheral side of the disk and the non-wobbled groove NWG is located on the inner peripheral side of the disk. On the other hand, the track Tr · B is a track in which the wobbled groove WG is located on the inner peripheral side of the disk and the non-wobbled groove NWG is located on the outer peripheral side of the disk. In other words, it can be considered that a wobble is formed only on one side on the outer peripheral side of the disk for the track Tr.A, and a wobble is formed only on one side on the inner peripheral side of the disk for the track Tr.B. . In this case, the track pitch is the track Tr adjacent to each other.
・ It is the distance between each center of A and track Tr ・ B,
The track pitch is 0.95 μm as shown in FIG.
It has been.

Here, the wobbles formed in the groove as the wobbled groove WG are formed based on a signal in which a physical address on the disk is encoded by FM modulation + biphase modulation. Therefore, it is possible to extract the physical address on the disc by demodulating the reproduction information obtained from the wobbling given to the wobbled groove WG at the time of recording / reproduction. Further, the address information as the wobbled groove WG is commonly effective for the tracks Tr · A and Tr · B. In other words, the track Tr · A located on the inner periphery of the wobbled groove WG and the track Tr · B located on the outer periphery share the address information by the wobbling given to the wobbled groove WG. . Note that such an addressing scheme is also called an interlace addressing scheme. By adopting this interlace addressing method, for example, it is possible to reduce the track pitch while suppressing crosstalk between adjacent wobbles. For a method of recording an address by forming a wobble in a groove, A
Also called DIP (Adress In Pregroove) method.

The identification of which one of the tracks Tr.A and Tr.B sharing the same address information is being traced as described above can be performed as follows. For example, in a state where the main beam is tracing a track (land Ld) by applying a three-beam method, the remaining two side beams trace grooves located on both sides of the track being traced by the main beam. It is possible to make it.

FIG. 2B shows a specific example in which the main beam spot SPm traces the track Tr · A. In this case, of the two side beam spots SPs1 and SPs2, the inner side beam spot SPs1 traces the non-wobbled groove NWG and the outer side beam spot S
Ps2 traces the wobbled groove WG. On the other hand, although not shown, if the main beam spot SPm traces the tracks Tr and B, the side beam spot SPs1 traces the wobbled groove WG and the side beam spot SP
s2 traces the non-wobbled groove NWG. Thus, the main beam spot SPm
Tracing the track Tr · A and the track T
In the case of tracing r · B, the grooves to be traced by the side beam spots SPs1 and SPs2 are necessarily replaced by the wobbled groove WG and the non-wobbled groove NWG.

Side beam spots SPs1, SPs2
As a detection signal obtained by the photodetector due to the reflection of light, different waveforms are obtained depending on which of the wobbled groove WG and the non-wobbled groove NWG is being traced. By determining which of the side beam spots SPs1 and SPs2 traces the wobbled groove WG (or the non-wobbled groove NWG), the main beam is moved to the tracks Tr · A,
Which of Tr and B is being traced can be identified.

FIG. 3 shows the main specifications of the MD-DATA2 format having the track structure as described above.
It is a figure shown in comparison with D-DATA1 format.
First, in the MD-DATA1 format, the track pitch is 1.6 μm and the pit length is 0.59 μm / bi.
t. The laser wavelength λ is set to 780 nm, and the aperture ratio NA of the optical head is set to 0.45. As a recording method, a groove recording method is adopted. That is, the groove is used as a track for recording and reproduction. As a method of addressing, a method of forming a groove (track) by a single spiral and using a wobbled groove in which wobbles are formed as address information on both sides of the groove is adopted.

As a modulation method of recording data, EFM (8
-14 conversion). As an error correction method, ACIRC (Advanced Cross Interleave Reed-
Solomon Code) and a convolutional data interleave. Therefore, the data redundancy is 46.3%.

In the MD-DATA1 format, a CLV (Constant Linear V) is used as a disk drive system.
erocity) is adopted, and the linear velocity of CLV is
1.2 m / s. The standard data rate during recording and reproduction is 133 kB / s, and the recording capacity is 140 MB.

On the other hand, the MD-DATA2 format which can be supported by the video camera of this embodiment has a track pitch of 0.95 μm and a pit length of 0.39 μm / b.
It can be seen that both are shorter than the MD-DATA1 format. For example, in order to realize the pit length, the laser wavelength λ = 650 nm and the aperture ratio NA of the optical head are set to 0.52, thereby narrowing the beam spot diameter at the in-focus position and expanding the band as an optical system. .

As described with reference to FIGS. 1 and 2, a land recording method is adopted as a recording method, and an interlace addressing method is adopted as an address method. As a modulation method of recording data, an RLL (1,7) method (RLL;
Run Length Limited), an RS-PC method is used as an error correction method, and a block complete type is used as data interleaving. As a result of adopting each of the above methods, the data redundancy can be suppressed to 19.7%.

Also in the MD-DATA2 format, CLV is adopted as a disk drive system, but its linear velocity is 2.0 m / s, and the standard data rate for recording / reproducing is 589 kB / s. It is said. As a result, a recording capacity of 650 MB can be obtained. Compared with the MD-DATA1 format, this means that a high-density recording of almost four times is realized. For example, assuming that a moving image is to be recorded in the MD-DATA2 format, MPEG
In the case where the compression encoding by 2 is performed, it is possible to record a moving image of 15 minutes to 17 minutes in time, depending on the bit rate of the encoded data. Also, assuming that only audio signal data is recorded, the ATR
When a compression process using AC (Adaptive Transform Acoustic Coding) 2 is performed, recording can be performed for about 10 hours.

2. 6A, 6B, and 6C are a side view, a plan view, and a rear view showing an example of the appearance of the video camera of this example. As shown in these figures, the main body 200 of the video camera of the present embodiment includes:
A camera lens 201 provided with an imaging lens and a diaphragm for taking a picture is provided so as to be exposed. A pair of left and right microphones 202 is provided. That is, in this video camera, recording of an image taken by the camera lens 201 and
It is possible to record stereo sound collected by the microphone 202.

On the side surface of the main body 200, a display section 6A, a speaker 205, and an indicator 206 are provided.
The display unit 6A is a part that displays and outputs a captured image, an image reproduced by an internal recording and reproducing device, and the like. The display device actually employed as the display unit 6A is not particularly limited here, but may be a liquid crystal display, for example. The display unit 6A also displays a message such as a character or a character for notifying a user of a required message in accordance with the operation of the device. When the recorded sound is reproduced from the speaker 205, the reproduced sound is output, and a required message sound such as a beep sound is output, for example. The indicator 206 emits light during a recording operation, for example, to indicate to the user that the video camera is performing a recording operation.

A viewfinder 204 is provided on the back side of the main body 200, and displays an image taken from the camera lens 201, a character image, and the like during a recording operation and a standby state. The user can shoot while looking at the viewfinder 204. In the present embodiment, viewfinder 204
For example, a display device such as a liquid crystal display is adopted. On the back side of the main body 200, a disk slot 203, a video output terminal T1, a headphone / line terminal T2, and an I / F terminal T3 are further provided. The disk slot 203 is a slot portion for inserting or ejecting a disk as a recording medium corresponding to the video camera of this example. The video output terminal T1 is a terminal for outputting a reproduced image signal or the like to an external video device, and the headphone / line terminal T2 is a terminal for outputting a reproduced audio signal to an external audio device or headphones. The I / F terminal T3 is, for example, an input / output terminal of an interface for performing data transmission with an external data device.

Further, various parts for user operation as described below are provided in each part of the main body 200. The main dial 300 is for turning on / off the video camera.
An operator for setting off, recording operation, and reproduction operation. When the main dial is at the "OFF" position as shown in the figure, the power is off. When the main dial is turned to the "STBY" position, the power is turned on and the recording operation is in a standby state. Further, by turning to the position of “PB”, the power is turned on and a standby state of the reproducing operation is set.

The release key 301 functions as a recording start or a recording shutter operator when in a recording standby state.

A zoom key 304 is an operator for operating a zoom state (tele side to wide side) regarding image shooting. The eject key 305 is
This is an operator for ejecting the disc loaded in the inside. Play / pause key 306, stop key 307,
Search keys 308 and 309 are prepared for various operations during reproduction with respect to the disc.

The appearance of the video camera shown in FIG. 6 is merely an example, and may be appropriately changed in accordance with the use conditions and the like actually required for the video camera of the present embodiment. Of course, various types of operation elements, operation methods, and connection terminals with external devices can be considered.

3. FIG. 4 is a block diagram showing an example of the internal configuration of the video camera of the present embodiment. The lens block 1 shown in FIG. 1 includes, for example, an optical system 11 actually including an imaging lens and a diaphragm. The camera lens 201 shown in FIG. 6 is included in the optical system 11. The lens block 1 includes a focus motor for causing the optical system 11 to perform an autofocus operation, a zoom motor for moving the zoom lens based on the operation of the zoom key 304, and the like.
Provided as

The camera block 2 is provided with a circuit section for mainly converting image light taken by the lens block 1 into a digital image signal. For the CCD (Charge Coupled Device) 21 of the camera block 2,
An optical image of the subject transmitted through the optical system 11 is provided. C
In the CD 21, an image pickup signal is generated by performing photoelectric conversion on the optical image, and a sample hold / AGC (A
utomatic Gain Control) circuit 22. The sample hold / AGC circuit 22 adjusts the gain of the imaging signal output from the CCD 21 and performs waveform shaping by performing sample hold processing. The output of the sample hold / AGC circuit 2 is a video A / D
By being supplied to the converter 23, it is converted into digital image signal data.

The above CCD 21, sample hold / AG
Signal processing timing in the C circuit 22 and the video A / D converter 23 is controlled by a timing signal generated by a timing generator 24. The timing generator 24 receives a clock used for signal processing in a data processing / system control circuit 31 (in the video signal processing circuit 3) described later and generates a required timing signal based on the clock. Is done. Thereby, the signal processing timing in the camera block 2 is synchronized with the processing timing in the video signal processing unit 3. Camera controller 2
Reference numeral 5 is for performing necessary control so that each of the functional circuit units provided in the camera block 2 operates properly, and for performing autofocus, automatic exposure adjustment, aperture adjustment, zooming, and the like on the lens block 1. Is controlled. For example, in the case of auto-focus control, the camera controller 25 performs, based on focus control information obtained in accordance with a predetermined
Controls the rotation angle of the focus motor. As a result, the imaging lens is driven to be in the just-focused state.

At the time of recording, the video signal processing unit 3 performs a compression process on the digital image signal supplied from the camera block 2 and the digital audio signal obtained by collecting sound by the microphone 202, and compresses the compressed data. The data is supplied to the subsequent media drive unit 4 as user recording data. Further, an image generated from the digital image signal and the character image supplied from the camera block 2 is supplied to the viewfinder drive unit 207 and displayed on the viewfinder 204. Further, at the time of reproduction, demodulation processing is performed on user reproduction data (data read from the disk 51) supplied from the media drive unit 4, that is, image signal data and audio signal data that have been subjected to compression processing, and these are reproduced. , And output as a reproduced audio signal.

In this example, as a compression / expansion processing method for image signal data (image data), MPEG (Moving Picture Experts Group) 2 is adopted for moving images, and JPEG (Joint Photographic) is used for still images.
Coding Experts Group). The audio signal data compression / expansion processing method includes ATR
AC (Adaptive Transform Acoustic Coding) 2 shall be adopted.

The data processing / system control circuit 31 of the video signal processing section 3 mainly performs control processing relating to compression / expansion processing of image signal data and audio signal data in the video signal processing section 3 and video signal processing section 3. Executes the process for controlling the input and output of data passing through. Further, it also generates display image data to be displayed on the viewfinder 204 and the display unit 6A, and performs signal processing for display output. The control processing for the entire video signal processing unit 3 including the data processing / system control circuit 31 is executed by the video controller 38. The video controller 38 includes, for example, a microcomputer and the like, and can communicate with the camera controller 25 of the camera block 2 and a driver controller 46 of the media drive unit 4 described later via, for example, a bus line (not shown). Have been.

As a basic operation at the time of recording in the video signal processing unit 3, image data supplied from the video A / D converter 23 of the camera block 2 is input to the data processing / system control circuit 31. The data processing / system control circuit 31 supplies the input image signal data to, for example, the motion detection circuit 35. The motion detection circuit 35 performs image processing such as motion compensation on the input image signal data while using the memory 36 as a work area, and then supplies the processed image signal data to the MPEG2 video signal processing circuit 33.

In the MPEG2 video signal processing circuit 33, for example, while using the memory 34 as a work area, the input image signal data is subjected to compression processing in accordance with the MPEG2 format, and a bit stream of compressed data as a moving image (MPEG2 Bit stream). In the MPEG2 video signal processing circuit 33, for example, when extracting image data as a still image from image signal data as a moving image and performing compression processing on the extracted image data, the compressed image data as a still image in accordance with the JPEG format is used. Is configured to generate It should be noted that JPEG was not adopted and MPEG
As compressed image data in the second format, an I picture (Intra Picture), which is regular image data, may be treated as still image data. MPEG
The image signal data (compressed image data) compressed and encoded by the two-video signal processing circuit 33 is written into the buffer memory 32 at a predetermined transfer rate and temporarily stored. In the MPEG2 format, as is well known, a so-called encoding bit rate (data rate) is used as a constant bit rate (CBR).
ate) and a variable bit rate (VBR), and the video signal processing unit 3 can cope with these.

For example, when performing image compression processing by VBR, for example, the motion detection circuit 35 performs motion detection on the image data within a range of several tens to several hundreds of frames in units of macroblocks, and determines that there is motion. Then, the detection result is transmitted to the MPEG2 video signal processing circuit 33 as motion vector information. The MPEG2 video signal processing circuit 33 determines the quantization coefficient for each macroblock so as to use the required information such as the motion vector information so that the image data after compression and encoding has a certain required data rate. It is made to do.

The audio compression encoder / decoder 37 includes:
A / D converter 64 (display / image / audio input / output unit 6)
For example, the sound collected by the microphone 202 is input as digital sound signal data. The audio compression encoder / decoder 37 performs compression processing on the input audio signal data in accordance with the ATRAC2 format as described above. This compressed audio signal data is also written into the buffer memory 32 by the data processing / system control circuit 31 at a predetermined transfer rate, and is temporarily stored here.

As described above, the compressed image data and the compressed audio signal data can be stored in the buffer memory 32. The buffer memory 32 mainly absorbs a speed difference between the data transfer rate between the camera block 2 or the display / image / audio input / output unit 6 and the buffer memory 32 and the data transfer rate between the buffer memory 32 and the media drive unit 4. Has a function for Buffer memory 3
The compressed image data and the compressed audio signal data stored in 2 are read out sequentially at a predetermined timing during recording, and transmitted to the MD-DATA2 encoder / decoder 41 of the media drive unit 4. However, for example, during the reproduction, the reading of the data stored in the buffer memory 32 and the operation of recording the read data from the media drive unit 4 to the disk 51 via the deck unit 5 are performed intermittently. No problem. Such control of writing and reading data to and from the buffer memory 32 is executed by, for example, the data processing / system control circuit 31.

The operation at the time of reproduction in the video signal processing section 3 is roughly as follows. At the time of reproduction, compressed image data and compressed audio signal data (user reproduction data) read from the disk 51 and decoded according to the MD-DATA2 format by the processing of the MD-DATA2 encoder / decoder 41 (in the media drive unit 4) Data processing / system control circuit 31
Will be transmitted. The data processing / system control circuit 31 temporarily stores the input compressed image data and compressed audio signal data in the buffer memory 32, for example. Then, the compressed image data and the compressed audio signal data are read from the buffer memory 32 at a required timing and at a transfer rate at which the reproduction time axis can be matched.
The compressed audio signal data is supplied to the video signal processing circuit 33, and the compressed audio signal data is supplied to the audio compression encoder / decoder 37.

In the MPEG2 video signal processing circuit 33,
Decompresses the input compressed image data,
It is transmitted to the data processing / system control circuit 31. In the data processing / system control circuit 31,
The expanded image signal data is supplied to the video D / A converter 61 (in the display / image / audio input / output unit 6). The audio compression encoder / decoder 37 performs an expansion process on the input compressed audio signal data,
/ A converter 65 (in display / image / audio input / output unit 6)
To supply.

In the display / image / audio input / output unit 6,
The image signal data input to the video D / A converter 61 is converted into an analog image signal here, and is branched and input to the display controller 62 and the composite signal processing circuit 63. The display controller 62 drives the display unit 6A based on the input image signal. As a result, a reproduced image is displayed on the display unit 6A. Further, in the display unit 6A, not only an image obtained by reproducing from the disk 51 but also a captured image obtained by photographing with a camera part including the lens block 1 and the camera block 2 is naturally displayed. It is possible to display and output almost in real time. Further, in addition to the reproduced image and the captured image, as described above, a message display such as a character or a character for notifying the user of a required message in accordance with the operation of the device is also performed. Such a message display is output to the video D / A converter 61 in the data processing / system control circuit 31 so that required characters, characters, and the like are displayed at predetermined positions under the control of the video controller 38, for example. Processing for synthesizing required image signal data with image signal data of required characters, characters, or the like may be performed. Therefore, the data processing / system control circuit 31 includes a signal processing circuit including an on-screen display function.

The composite signal processing circuit 63 converts the analog image signal supplied from the video D / A converter 61 into a composite signal and outputs it to the video output terminal T1. For example, if a connection is made to an external monitor device or the like via the video output terminal T1, an image reproduced by the video camera can be displayed on the external monitor device.

In the display / image / audio input / output section 6, the audio signal data input from the audio compression encoder / decoder 37 to the D / A converter 65 is converted into an analog audio signal here, and the signals are supplied to a headphone / line terminal. T
2 is output. In addition, the analog audio signal output from the D / A converter 65 is also branched and output to the speaker SP via the amplifier 66, whereby the reproduced audio and the like are output from the speaker SP. Become.

At the time of recording, the media drive unit 4 mainly encodes the recording data in accordance with the MD-DATA2 format so as to conform to the disk recording and transmits the encoded data to the deck unit 5, and at the time of reproduction, the deck unit 5 transmits the data from the disk 51. By performing decoding processing on the read data, reproduced data is obtained and transmitted to the video signal processing unit 3.

The MD-DAT of the media drive unit 4
When recording, the A2 encoder / decoder 41
Recording data (compressed image data + compressed audio signal data) is input from the data processing / system control circuit 31, the recording data is subjected to a predetermined encoding process in accordance with the MD-DATA2 format, and the encoded data is temporarily stored. The data is stored in the buffer memory 42. Then, the data is transmitted to the deck unit 5 while being read at a required timing.

At the time of reproduction, the digital reproduction signal read from the disk 51 and input through the RF signal processing circuit 44 and the binarization circuit 43 is subjected to MD-DAT.
A decoding process according to the A2 format is performed, and the data is transmitted to the data processing / system control circuit 31 of the video signal processing unit 3 as reproduction data. Also at this time, if necessary, the reproduced data is temporarily stored in the buffer memory 42, and the data read therefrom at a required timing is transmitted to the data processing / system control circuit 31 for output. Such writing / reading control for the buffer memory 42 is performed by the driver controller 46. Note that, for example, when the servo is disengaged due to disturbance or the like during reproduction of the disk 51 and reading of a signal from the disk becomes impossible, the read data is stored in the buffer memory 42 during the period during which the read data is accumulated. If the reproduction operation for the disc is resumed, the chronological continuity as the reproduction data can be maintained.

The RF signal processing circuit 44 includes a disk 51
By performing the required processing on the read signal from
For example, it generates an RF signal as reproduction data, a servo control signal such as a focus error signal and a tracking error signal for servo control of the deck unit 5, and the like. RF
The signal is binarized by the binarization circuit 43 as described above, and input to the MD-DATA2 encoder / decoder 41 as digital signal data. The generated various servo control signals are supplied to the servo circuit 45. In the servo circuit 45, based on the input servo control signal,
The required servo control in the deck section 5 is executed.

In this example, MD-DATA1
An encoder / decoder 47 corresponding to the format is provided. The encoder / decoder 47 encodes the recording data supplied from the video signal processing unit 3 in accordance with the MD-DATA1 format and records the encoded data on the disk 51. It is also possible to perform decoding processing on data encoded in accordance with the MD-DATA1 format, and transmit and output it to the video signal processing unit 3. That is, as the video camera of this example, the MD-DATA2 format and the MD-DATA2 format are used.
It is configured to obtain compatibility with the DATA1 format. The driver controller 46 is a functional circuit unit for controlling the media drive unit 4 as a whole.

The deck section 5 is a part comprising a mechanism for driving the disk 51. Although not shown here, in the deck section 5, the disk 5 to be loaded is
1 is detachable and has a mechanism (disc slot 203 (see FIG. 6)) that can be replaced by a user's work. Further, it is assumed that the disk 51 here is a magneto-optical disk corresponding to the MD-DATA2 format or the MD-DATA1 format.

In the deck section 5, a spindle motor 5 for rotating the loaded disk 51 by CLV is used.
2 is driven to rotate by the CLV. The optical head 53 irradiates the disk 51 with laser light during recording / reproduction. The optical head 53 performs high-level laser output for heating the recording track to the Curie temperature during recording, and performs relatively low-level laser output for detecting data from reflected light by the magnetic Kerr effect during reproduction. . Therefore, the optical head 53
Although not shown in detail here, a laser diode as a laser output unit, an optical system including a polarizing beam splitter and an objective lens, and a detector for detecting reflected light are mounted. The objective lens provided in the optical head 53 is held by a biaxial mechanism so as to be displaceable in a radial direction of the disk and in a direction of coming and coming from the disk.

The optical head 5 with the disk 51 interposed therebetween
A magnetic head 54 is arranged at a position facing 3. The magnetic head 54 performs an operation of applying a magnetic field modulated by recording data to the disk 51. Although not shown, the thread motor 55
And a thread mechanism driven by the thread mechanism. By driving the sled mechanism, the entire optical head 53 and the magnetic head 54 can be moved in the disk radial direction.

The operation unit 7 is provided with each of the operators 300, shown in FIG.
301, 304 to 309, etc., and various kinds of operation information of the user by these operators are supplied to, for example, the video controller 38. The video controller 38 supplies, to the camera controller 25 and the driver controller 46, operation information and control information for causing each unit to execute necessary operations according to a user operation.

The external interface 8 is provided so that data can be transmitted between the video camera and the external device. For example, the external interface 8 is provided between the I / F terminal T3 and the video signal processing unit as shown in FIG. Can be The external interface 8 is not particularly limited here, but may be, for example, IEEE 1394 or the like. For example, when an external digital imaging device and the video camera of this embodiment are connected via the I / F terminal T3, it becomes possible to record an image (audio) captured by the video camera on the external digital imaging device. . In addition, image (sound) data reproduced by an external digital image device or the like is captured via the external interface 8 so that MD-
It is also possible to record on the disk 51 in accordance with the DATA2 (or MD-DATA1) format.

The power supply block 9 supplies a required level of power supply voltage to each functional circuit unit using a DC power supply obtained from a built-in battery or a DC power supply generated from a commercial AC power supply. On / off of the main power supply by the power supply block 9 is controlled by the video controller 38 in accordance with the operation of the main dial 300 described above. During the recording operation, the video controller 38 operates the indicator 20.
The light emitting operation of No. 6 is executed.

4. Configuration of Media Drive Unit Next, as the configuration of the media drive unit 4 shown in FIG. 4, a detailed configuration in which a functional circuit unit corresponding to MD-DATA2 is extracted will be described with reference to the block diagram of FIG. In FIG. 5, the deck unit 5 is shown together with the media drive unit 4. However, since the internal configuration of the deck unit 5 has been described with reference to FIG. 4, the same reference numerals as in FIG. I do. In the media drive unit 4 shown in FIG. 5, the same reference numerals are given to the ranges corresponding to the blocks in FIG.

Information detected by data reading operation of the optical head 53 from the disk 51 (photocurrent obtained by detecting laser reflected light by a photodetector)
Is supplied to the RF amplifier 101 in the RF signal processing circuit 44. The RF amplifier 101 generates a reproduction RF signal as a reproduction signal from the input detection information and supplies the reproduction RF signal to the binarization circuit 43. The binarization circuit 43 binarizes the input reproduction RF signal to obtain a digital reproduction RF signal (binary RF signal). This binarized RF signal is supplied to the MD-DATA2 encoder / decoder 41, and first, the AGC / clamp circuit 103
Are input to the equalizer / PLL circuit 104 after gain adjustment, clamp processing, and the like have been performed. The equalizer / PLL circuit 104 performs an equalizing process on the input binary RF signal, and
5 is output. In addition, binarization R after equalizing processing
By inputting the F signal to the PLL circuit, the binarized RF
Clock C synchronized with signal (RLL (1,7) code string)
Extract LK.

The frequency of the clock CLK corresponds to the current disk rotation speed. Therefore, the CLV processor 11
1, the clock C is output from the equalizer / PLL circuit 104.
LK is input, error information is obtained by comparing with a reference value corresponding to a predetermined CLV speed (see FIG. 3), and this error information is used as a signal component for generating a spindle error signal SPE. Further, the clock CLK includes, for example, the RLL (1, 7) demodulation circuit 106 and the like.
It is used as a clock for processing in a required signal processing circuit system.

The Viterbi decoder 105 has an equalizer / P
The binary RF signal input from the LL circuit 104 is subjected to a decoding process according to a so-called Viterbi decoding method. As a result, reproduced data as an RLL (1, 7) code string is obtained. This reproduced data is RLL (1,
7) The signal is input to the demodulation circuit 106, where RLL (1,
7) The data stream is subjected to demodulation.

The data stream obtained by the demodulation processing in the RLL (1, 7) demodulation circuit 106 is written to the buffer memory 42 via the data bus 114 and is developed on the buffer memory 42. The data stream expanded on the buffer memory 42 in this manner is first subjected to error correction processing in error correction block units according to the RS-PC system by the ECC processing circuit 116, and further descramble / E
The DC decoding circuit 117 performs a descrambling process and an EDC decoding process (error detection process). The data processed so far is the reproduction data DA
TAp. The reproduction data DATAp is transmitted at a transfer rate according to the transfer clock generated by the transfer clock generation circuit 121, for example, from the descrambling / EDC decoding circuit 117 to the data processing / processing of the video signal processing unit 3.
The data is transmitted to the system control circuit 31.

The transfer clock generation circuit 121 includes, for example,
When a crystal clock is used for data transmission between the media drive unit 4 and the video signal processing unit 3 and data transmission between functional circuit units in the media drive unit 4,
It is a part for generating a transfer clock (data transfer rate) having a frequency appropriately determined. In addition, an operation clock having a required frequency to be supplied to each functional circuit unit of the media drive unit 4 and the video signal processing unit 3 is generated according to the operation state of the video camera.

The detection information (photocurrent) read from the disk 51 by the optical head 53 is transmitted to the matrix amplifier 1
07 is also supplied. The matrix amplifier 107 performs required arithmetic processing on the input detection information, thereby obtaining a tracking error signal TE, a focus error signal FE, and groove information (absolute address information recorded as a wobbled groove WG on the disk 51) GFM. Are supplied to the servo circuit 45. That is, the extracted tracking error signal TE and focus error signal FE are supplied to the servo processor 112, and the groove information GFM is stored in the ADIP bandpass filter 108.
Supplied to

The groove information GFM band-limited by the ADIP band-pass filter 108 is supplied to an A / B track detection circuit 109, an ADIP decoder 110, and a CLV.
It is supplied to the processor 111. In the A / B track detecting circuit 109, based on the input groove information GFM, for example, the track currently being traced is determined based on the method described with reference to FIG.
A, TR or B is determined, and the track determination information is transmitted to the driver controller 46.
Output to The ADIP decoder 110 decodes the input groove information GFM to extract an ADIP signal, which is absolute address information on the disk, and outputs the signal to the driver controller 46. The driver controller 46 executes necessary control processing based on the track identification information and the ADIP signal.

The CLV processor 111 receives the clock CLK from the equalizer / PLL circuit 104 and the groove information GFM via the ADIP bandpass filter 108. The CLV processor 111 generates a spindle error signal SPE for CLV servo control based on, for example, an error signal obtained by integrating a phase error between the groove information GFM and the clock CLK, and outputs the spindle error signal SPE to the servo processor 112. The required operation to be executed by the CLV processor 111 is controlled by the driver controller 46.

The servo processor 112 receives various servo control signals based on the tracking error signal TE, the focus error signal FE, the spindle error signal SPE, the track jump command and the access command from the driver controller 46, and the like. (A tracking control signal, a focus control signal, a thread control signal, a spindle control signal, and the like) are generated and output to the servo driver 113. In the servo driver 113,
A required servo drive signal is generated based on the servo control signal supplied from the servo processor 112. Here, the servo drive signal includes a two-axis drive signal (two types of focus direction and tracking direction) for driving the two-axis mechanism, a sled motor drive signal for driving the sled mechanism, and a spindle motor drive signal for driving the spindle motor 52. Becomes By supplying such a servo drive signal to the deck section 5, focus control and tracking control on the disk 51 and CLV control on the spindle motor 52 are performed.

When a recording operation is performed on the disk 51, for example, data processing /
Scramble / ED from system control circuit 31
The recording data DATAR for the C encoding circuit 115
Will be input. This user record data DAT
Ar is input in synchronization with, for example, a transfer clock generated by the transfer clock generation circuit 121.

Scramble / EDC encoding circuit 11
In step 5, for example, the recording data DATAR is written into the buffer memory 42 and developed,
DC encoding processing (addition processing of an error detection code by a predetermined method) is performed. After this processing, for example, the ECC processing circuit 116 adds an error correction code according to the RS-PC method to the recording data DATAR developed in the buffer memory 42. The recording data DATAR that has been processed up to this point is read from the buffer memory 42 and transmitted to the RL via the data bus 114.
The signal is supplied to the L (1, 7) modulation circuit 118.

The RLL (1, 7) modulation circuit 118 applies RLL (1, 7) to the input recording data DATAR.
7) A modulation process is performed, and the recording data as the RLL (1, 7) code string is output to the magnetic head drive circuit 119.

Incidentally, in the MD-DATA2 format, a so-called laser strobe magnetic field modulation system is adopted as a recording system for a disk. The laser strobe magnetic field modulation method refers to a recording method in which a magnetic field modulated by recording data is applied to a recording surface of a disk, and a laser beam to be irradiated on the disk is pulsed in synchronization with the recording data. In such a laser strobe magnetic field modulation method, the process of forming a pit edge recorded on a disk does not depend on transient characteristics such as the reversal speed of a magnetic field, but is determined by the laser pulse irradiation timing. For this reason, the laser strobe magnetic field modulation method is compared with, for example, a simple magnetic field modulation method (a method in which a laser beam is constantly irradiated onto a disk and a magnetic field modulated by recording data is applied to a disk recording surface). In this case, it is possible to make the jitter of the recording pit extremely small. That is, the laser strobe magnetic field modulation method is a recording method advantageous for high-density recording.

The magnetic head drive circuit 119 of the media drive unit 4 operates so that a magnetic field modulated by the input recording data is applied from the magnetic head 54 to the disk 51. Further, the RLL (1, 7) modulation circuit 118 outputs a clock synchronized with the recording data to the laser driver 120. The laser driver 120 controls the optical head 5 so that the disk is irradiated with a laser pulse synchronized with recording data generated as a magnetic field by the magnetic head 54 based on the input clock.
The third laser diode is driven. At this time, the laser pulse emitted and output from the laser diode is based on a required laser power suitable for recording. In this way, the recording operation as the laser strobe magnetic field modulation method is enabled by the media drive unit 4 of the present embodiment.

5. Outline of Detection of Dirt on Lens and Output of Message Subsequently, detection of dirt on the camera lens 201 by the video camera according to the present embodiment having the above-described configuration and output of a message to the user based on the detection information will be schematically described. The “dirt” of the camera lens mentioned here
The term includes not only so-called dirt such as fingerprints attached to the camera lens 201, but also dirt such as dust attached to the camera lens 201.

If any dirt is attached to the camera lens 201, the dirt on the camera lens 201 appears in the captured image. Therefore, in the present embodiment, the presence or absence of dirt adhering to the camera lens 201 is configured to be detected based on a signal processing result obtained in the course of signal processing in the video signal processing unit 3. In addition,
A specific detection method will be described later.

When it is detected that dirt is attached to the camera lens 201, in the present embodiment, a message notifying that dirt is attached to the lens is provided to the user as a message for cleaning the camera lens 201. A message prompting (cleaning) is output.

Here, the following forms can be considered as the output form of the message prompting the cleaning of the camera lens 201. One is to display a message prompting cleaning of the camera lens 201 on at least one of the viewfinder 204 and the display unit 6A. For example, as shown in FIG. 7, a message display MSS prompting cleaning of the camera lens 201 is displayed on the viewfinder 204 or the display screen of the display unit 6A where the monitor image is displayed. Here, a state is shown in which a message with the words “Please clean the lens” is displayed by superimposition as the message display MSS.

The message display MSS is not limited to the form shown in FIG. 7, but may be any form that allows the user to intuitively understand that the camera lens 201 is being cleaned. Symbol display may be used. Further, if the message display MSS is displayed in a blinking manner, the message display MSS can be recognized more reliably as long as the user is looking into the viewfinder 204 or the display unit 6A.

Further, it has been described above that the message display MSS is to be displayed on at least one of the viewfinder 204 and the display unit 6A. However, one of the viewfinder 204 and the display unit 6A is actually used. In the case of adopting a configuration in which only the image is displayed, the user often monitors the captured image while looking through the viewfinder 204 rather than looking at the display unit 6A. Displaying the message display MSS on the finder 204 is preferable for the user's convenience.

Another form of outputting a message prompting cleaning of the camera lens 201 is to output the message by voice. In this case, for example,
If it is detected that the camera lens 201 is contaminated under the operation state in which the captured image data is supplied to the video signal processing unit 3, a message prompting the camera 205 to clean the camera lens 201 by sound from the speaker 205. Will be output.

Here, the output form of the message as a voice may be a beep sound with a specific tone or rhythm, or may be output by a human voice such as “Please clean the lens”. Is also good.

6. Method for Detecting Dirt on Lens Subsequently, a method for detecting dirt on the lens in the present embodiment will be described. FIG. 8A shows the video signal processing unit 3.
For example, a sample image for one field is schematically shown as captured image data obtained in. Here, the state of the sample image shown in FIG. 8A corresponds to a state in which no dirt is attached to the camera lens 201. FIG. 8B schematically shows frequency characteristics of line data corresponding to the scanning lines shown in FIG. 8A.

For example, in the video signal processing unit 3,
For compression encoding of image data, the motion detection circuit 35 performs motion detection for each of the sample images. Here, the portion represented by the white and black grids in FIG. 8A is assumed to indicate a captured image excluding the camera lens 201 from being stained. In general, in a captured image obtained by shooting with a video camera, some motion is detected as the shooting time elapses. Therefore, the motion detection circuit 35 generates almost a motion of the sample image shown in FIG. That is, it is detected that there is some movement in all areas.

When it is assumed that there is no image portion corresponding to the dirt on the camera lens 201 in the sample image, it depends on the actual image content. , FIG.
As shown in (b), it is known that a result such that a peak is obtained near a certain predetermined frequency is detected.

On the other hand, FIG.
1 shows a sample image in a state where dirt is attached. Here, a white circle indicated by a white arrow A in the sample image is an image part obtained due to contamination of the camera lens 201. FIG. 8D schematically shows frequency characteristics of line data corresponding to the scanning lines shown in FIG. 8C.

The camera lens 2 as shown in FIG.
When motion detection is performed by the motion detection circuit 35 on a sample image in which dirt is attached to the sample image 01, for example, for an image portion represented by a white and black grid,
The arrow A indicates that some movement is detected.
In the white circle image portion indicated by, the state in which no motion is detected continues. That is, regardless of the progress of the processing of the motion detection circuit 35 with respect to the sample image, the white circle image portion indicated by the arrow A is recognized as a “fixed pattern” in which no motion is detected.

Further, the image portion where the camera lens 201 is stained tends to have an out-of-focus image state due to, for example, the focal point of the lens.
For this reason, as the frequency characteristics of the sample image in which the camera lens 201 is contaminated, in addition to the peak of the frequency band corresponding to the original image, as shown in FIG. In the frequency band B lower than the frequency band corresponding to the original image which is unique to the image portion generated by the above, a corresponding amplitude level can be obtained.

Therefore, in order for the video signal processing unit 3 to determine the presence or absence of dirt adhering to the camera lens 201 based on the captured image data, as a first method, only a specific image area in a sample image is used. It is determined whether or not a fixed pattern with no movement is detected. If this fixed pattern is detected, it is determined that the lens is dirty. If no fixed pattern is detected, it is determined that the lens is not dirty. .

The second method is to look at the frequency characteristics of pixel sample data forming a sample image,
When an amplitude equal to or higher than a predetermined threshold level is detected in the frequency band B of FIG. 8D, it is determined that the lens is dirty, and when an amplitude lower than the threshold level is detected, it is determined that the lens is not dirty. Will be. Note that the threshold level of the frequency band B may be set to an appropriate value according to the degree of the effect of dirt actually attached to the camera lens 201 on the recorded image.

Whether the first or second discrimination method is adopted may be set according to actual use conditions and the like. For example, if the detection accuracy is to be improved. For example, it is naturally possible to obtain a final determination result in accordance with the determination results of both the first determination method and the second determination method.

7. Processing Operation Next, based on the description so far, a configuration for detecting lens dirt by the video camera of the present embodiment and outputting a message according to the detection result will be described with reference to FIG. I do. In this processing, the data processing / system control circuit 31 executes necessary control processing and necessary signal processing for the MPEG2 video signal processing circuit 33 and the motion detection circuit 35, for example, based on the overall control of the video controller 38. It is realized by doing.

In this case, the captured image data is supplied from the camera block 2 to the video signal processing unit 3 so that the video signal processing unit 3 can perform image signal processing (for example, in a standby mode or a recording mode). First, in step S101, the data processing / system control circuit 31
Monitor the signal processing operation in the MPEG2 encoder (here, formed by the MPEG2 video signal processing circuit 33 and the motion detection circuit 35).

Here, in the MPEG2 encoder, analysis of frequency characteristics of sample image data of a picked-up image can be executed as a signal processing process for executing the image compression coding process. Therefore, in the data processing / system control circuit 31, step S
In step 102, a process for detecting the frequency characteristics of the captured image data is executed by taking in the result information of the frequency characteristics analysis process executed in the MPEG2 encoder. The detection result here is determined in step S104 described later.
Is temporarily stored in a RAM or the like in the data processing / system control circuit 31, for example. In order to increase the detection accuracy, the above-described step S1
It is preferable that the process of 02 is performed on sample image data corresponding to, for example, a plurality of field images, and, for example, a detection result is comprehensively derived from detection information on each sample image data.

In the following step S103, the processing for detecting the fixed pattern described with reference to FIG. 8C is executed by fetching the motion detection information in the motion detection circuit 35. Note that the detection result here is also temporarily held for the determination processing in the next step S104. In addition, it is preferable that the process of step S103 is also performed over a period with a corresponding time length in order to improve detection accuracy.

In the following step S104, a determination process is performed to determine whether or not the camera lens 201 is considered to be contaminated using the detection results obtained in steps S102 and S103.

[0094] The determination process may be actually performed as follows, for example. For example, it is determined whether or not the level of the low frequency band B detected in step S102 is equal to or higher than a threshold, and
It is determined whether or not a fixed pattern has been detected as the process of step S103. Then, when the level of the frequency band B is determined to be equal to or higher than the threshold and a fixed pattern is detected, it is determined that the camera lens 201 is dirty. On the other hand, if the fixed pattern is not detected even if the level of the frequency band B is equal to or higher than the threshold, or if the level of the frequency band B is equal to or lower than the threshold even if the fixed pattern is detected. Is to judge that the camera lens 201 is dirty.

[0095] However, the actual captured image varies in image state, and depending on the image capturing situation, it is conceivable that the captured image may have many portions of the subject that do not move or a low frequency band is likely to appear. Therefore, step S
At the time of the detection processing of 102 and S103, it is conceivable that the actual state of the subject is estimated based on the detection result over a certain period, and the determination method in step S104 is changed according to the estimation result.

As an example, in the case where it is detected from the detection result in step S103 that there is not much movement in the entire image area and it is predicted that a still object with no movement is a rough subject, step S104 is performed. In, the determination element depends on the detection information of the frequency band in step S102, and the detection result in step S103 is used as an auxiliary to execute the arithmetic processing for the determination. As described above, by changing the specific gravity using the detection results of steps S102 and S103 as a determination element in accordance with the predicted subject, a highly accurate determination result can be obtained regardless of a difference in a shooting situation.

In step S105, the camera lens 20 is determined as a result of the determination in step S104.
1 is determined to be dirty or not, and if the result of determination that the camera lens 201 is dirty is obtained, the process proceeds to step S106.

In step S106, control processing for outputting a message urging the user to clean the lens is performed, and this processing is terminated.

The actual control process in step S106 differs depending on the actual message output mode.
That is, as described above, if the message display MSS is displayed on the viewfinder 204 or the display unit 6A, the data processing / system control circuit 3
1, the display image data for displaying the monitor image on the viewfinder 204 or the display unit 6A is combined with the image data of the message display MSS so as to be mapped, and the viewfinder drive unit 20 is synthesized.
7. Video D / A converter 61 → Display controller 6
Feed to 2. If the message is output by voice, the data processing / system control circuit 3
1 to execute processing so as to generate audio signal data of a message audio to be output by the speaker 205 and supply it to the D / A converter 65 at the preceding stage of the speaker 205 via the audio compression encoder / decoder 37. Become. In this case, the data processing / system control circuit 31 has a configuration in which voice waveform data for message voice is stored.

On the other hand, if it is determined in step S105 that the camera lens 201 is free from dirt, the process is terminated.

Note that the present invention is not limited to the above configuration. For example, in the present embodiment, an image signal processing circuit system used for detecting dirt on a lens is an MPEG signal processing circuit.
Although the system is provided with the image data compression processing system of the two systems, for example, a system capable of compressing and encoding other moving image data may be adopted. Also, the compression method for still image data and audio data need not be particularly limited to those exemplified as the present embodiment (JPEG, ATRAC2, etc.).

In the above embodiment, a video camera provided with a recording / reproducing apparatus for recording / reproducing a disc is described as an example. However, the present invention is not limited to this. The present invention is also applicable to a video camera equipped with a video deck compatible with the recording media of the above types. Further, as long as a signal processing circuit having a configuration capable of detecting dirt on the lens is provided, a single imaging device (camera device) configured independently of the video signal recording / reproducing unit
However, the configuration of the present invention can be applied to the above.

[0103]

As described above, the present invention provides, for example,
Based on a fixed pattern of image data detected by a motion detection process performed by an image compression encoding processing circuit provided in the imaging device, a level detection result of a predetermined frequency band corresponding to lens contamination in the image data, and the like. The presence or absence of dirt attached to the lens is determined, and if there is dirt, for example, a message prompting the user to clean the lens is output by display or sound. This provides the video camera with a function of notifying the user of the actual lens dirt condition. For this reason, when dirt is attached to the lens when recording a captured image, the user can immediately know this by outputting a message, so that a good image almost free of noise due to dirt on the lens should be recorded. Can be done. That is, it is possible to prevent recording failures caused by dirt attached to the lens.

In order to detect dirt on the lens, a detection result obtained in a signal processing process of a compression encoding processing circuit provided for recording image data of a captured image on a recording medium is used. In particular, there is no need to separately provide a configuration for detecting lens dirt, and there is also an effect that it can be easily realized at low cost by processing of internal software.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a track structure of a disc corresponding to a video camera according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a track portion of a disc corresponding to the video camera of the embodiment in an enlarged manner.

FIG. 3 is an explanatory diagram showing specifications of a disc corresponding to the video camera of the embodiment.

FIG. 4 is a block diagram of an internal configuration of the video camera according to the embodiment.

FIG. 5 is a block diagram of an internal configuration of a media drive unit of the video camera according to the embodiment.

FIG. 6 is a side view, a plan view, and the like of the video camera according to the embodiment;
And a rear view.

FIG. 7 is an explanatory diagram showing an example of a display form when a message prompting lens cleaning is output and displayed.

FIG. 8 is an explanatory diagram showing a principle for detecting lens contamination using signal processing on image data.

FIG. 9 is a flowchart showing a processing operation for realizing detection of dirt on the lens and output of a message according to the detection result.

[Explanation of symbols]

1 lens block, 2 camera block, 3 video signal processing section, 4 media drive section, 5 deck section,
6 display / image / audio input / output unit, 6A display unit, 7 operation unit, 8 external interface, 9 power supply block,
11 optical system, 12 motor unit, 21 CCD, 22
Sample hold / AGC circuit, 23 A / D converter, 24 timing generator, 25 camera controller, 31 data processing / system control circuit, 32 buffer memory, 33 video signal processing circuit,
34 memories, 35 motion detection circuits, 36 memories, 3
7 audio compression encoder / decoder, 38 video controller, 41 MD-DATA2 encoder / decoder, 42 buffer memory, 43 binarization circuit, 44
RF signal processing circuit, 45 servo circuit, 46 driver controller, 51 disk, 52 spindle motor, 53 optical head, 54 magnetic head, 55 thread motor, 61 video D / A converter, 62 display controller, 63 composite signal processing circuit, 6
4 A / D converter, 65 D / A converter, 66
Amplifier, 101 RF amplifier, 103 AGC / clamp circuit, 104 Equalizer / PLL circuit, 105
Viterbi decoder, 106 RLL (1,7) demodulation circuit,
107 matrix amplifier, 108 ADIP bandpass filter, 109 A / B track detection circuit, 110
ADIP decoder, 111 CLV processor, 11
2 Servo processor, 113 Servo driver, 11
4 data bus, 115 scramble / EDC encoding circuit, 116 ECC processing circuit, 117 descramble / EDC decoding circuit, 118 RLL (1, 7)
Modulation circuit, 119 magnetic head drive circuit, 120 laser driver, 121 transfer clock generation circuit, 201
Camera lens, 202 microphone, 203 disk slot, 204 viewfinder, 205 speaker, 207 viewfinder drive unit, 300
Main dial, 301 release key, 304 zoom key, 305 eject key, 306 playback key, 3
07 Stop key, 308, 309 Search key, Ld
Land, NWG non-wobbled groove, WG wobbled groove, Tr A, Tr B track

Claims (3)

[Claims] An optical system including a lens unit for obtaining a captured image light, and a required signal process including a compression encoding process is performed as a signal process for image data obtained based on the captured image light. Image signal processing means capable of recording, image data subjected to signal processing by the image signal processing means on a predetermined recording medium, and a predetermined signal executed by the image signal processing means A dirt discriminating means for discriminating whether or not dirt is attached to the lens means based on the processing result; and a predetermined method when the dirt discriminating means determines that dirt is attached to the lens means. A video camera device comprising: a message output unit that outputs a message according to an output mode. 2. The image forming apparatus according to claim 1, wherein the dirt determining unit is configured to determine whether dirt adheres to the lens unit based on detection information about a fixed pattern in the image data obtained by a motion detection process that is a signal process performed by the image signal processing unit. 2. The video camera device according to claim 1, wherein the video camera device is configured to determine whether or not the video camera is operating. 3. The method according to claim 1, wherein the dirt determining unit determines whether dirt is attached to the lens unit based on a level state of a predetermined frequency band in the image data, which is detected as signal processing of the image signal processing unit. 2. The apparatus according to claim 1, wherein the apparatus is configured to determine
The video camera device according to item 1.