JPH05328276A - Camcorder and reproducing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention enables a video tape recorder with a built-in camera to record and reproduce a still image with little blur. An image obtained from the optical-electrical conversion element by periodically controlling the charge accumulation time by an electronic shutter means when taking out a subject image light as a change amount of the accumulated electric charge in the optical-electrical conversion element. A shutter effect is added to the signal and this is recorded on a video tape together with the identification code signal. When the recorded video tape thus obtained is to be reproduced still, only the recording track for still reproduction to which the identification code signal is added is reproduced, and as a result, a still image with less blurring can be recorded and reproduced more easily. it can.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder with a built-in camera, and more particularly to a video tape recorder capable of more easily capturing sharp still images.

[0002]

2. Description of the Related Art A video tape recorder (V
With the spread of (TR), the opportunity to use this for imaging of outdoor sports has increased. When capturing a fast-moving subject such as sports, a technique is generally used in which the so-called electronic shutter function is used to minimize blurring of the movement every moment.

That is, in the case of a camera using an accumulated charge transfer type (CCD) element which is usually used as an optical sensor, when capturing an ordinary subject, it is 1/60 second so as to synchronize with a vertical synchronizing signal of a television signal. In the cycle of CC
While the video signal stored in the charge storage section of the D sensor is read out, when the electronic shutter effect is activated, a method is adopted in which the read out is performed at a faster timing than waiting for the charge storage for 1/60 seconds. ing.

Therefore, in the electronic shutter mode, even if the subject moves at high speed, the charge accumulation time is short, and the amount of accumulated charge that varies due to the movement of the subject is reduced, resulting in less blurring of the subject. Such an electronic shutter effect can be obtained.

[0005]

However, when an image is captured using the electronic shutter effect, a contradictory phenomenon occurs in which signal noise is noticeable with respect to the regular accumulated charge corresponding to the subject. Especially when the image is taken indoors in a dark place, the influence of signal noise may not be negligible.

Further, when an image is captured by using the electronic shutter effect, the setting operation is unavoidably complicated, so that the setting is forgotten or the subject is unexpected while the subject having a small amount of motion is being imaged. If there is a sudden movement of, it may not be possible to deal with it.

Therefore, in practice, the imager of the video tape recorder with a built-in camera often does not use the electronic shutter effect under special conditions in order to avoid complicated operations, and the electronic shutter effect cannot be effectively used in the end. There was an inconvenience.

On the other hand, when reproducing a recorded video tape which is actually picked up, a still picture reproduction mode is selected to monitor a still picture, or an arbitrary scene is displayed in the normal reproduction mode as needed. Various reproduction modes are adopted in which the specified scene is specified and the specified scene is printed out by the printer. In such a case, all the scenes of the video tape are based on the movement of the subject when capturing. It is desirable to record video that does not contain blur.

The present invention has been made in consideration of the above points, and a scene having an electronic shutter effect can be recorded without requiring a complicated operation at the time of image pickup, and each scene is required at the time of reproduction. We propose a camera-integrated videotape recorder that can be reproduced reliably according to the requirements.

[0010]

In order to solve such a problem, in the present invention, an optical-electrical conversion element 2 for taking out subject image light as a change amount of accumulated electric charge, and accumulation of electric charge in the optical-electrical conversion element 2. An electronic shutter means (2, 2D) for controlling the time, a control means (16, 17) for periodically operating the electronic shutter means (2, 2D), and an electronic shutter means () during image pickup by the optical-electrical conversion element 2. Two, two
Identification code signal I indicating that D) is operated periodically
The ID code generating means 21 for outputting D and the ID code signal ID in accordance with the video signal output RVD from the optical-electrical conversion element 2 when the electronic shutter means (2, 2D) are operated are video in a predetermined relationship. Recording track T on tape 8
Recording means (5, 6, 7) for recording on the RX is provided.

[0011]

When the object image light is taken out as the change amount of the accumulated charge in the optical-electrical conversion element 2, the charge accumulation time is periodically controlled by the electronic shutter means (2, 2D), thereby optimizing the optical-electricity. A shutter effect is added to the video signal RVD obtained from the conversion element 2 and this is recorded on the video tape 8 together with the identification code signal ID. When still reproducing the recorded video tape 8 thus obtained, only the still reproducing recording track to which the identification code signal ID is added is reproduced, and as a result, a still image with less blurring is more easily recorded and reproduced. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, CVTR shows a camera-integrated video tape recorder as a whole, and the image pickup light transmitted through the lens 1 forms an image on a sensor area 2S of a solid-state image pickup element 2 which is a CCD as an optical-electric conversion element. Accumulates electric charges corresponding to the subject image. The solid-state image pickup device 2 is, for example, an interline CCD, and is designed to obtain a shutter effect by sweeping out unnecessary charges CG from the sweeping drain 2D, and outputs a video signal VD from a normal signal output shift register 2R. To do.

The video signal VD is supplied to the luminance signal / color signal (Y / C) recording processing circuit 4 via the preamplification circuit 3. The recording video signal RVD obtained from the luminance signal / color signal recording processing circuit 4 is sequentially passed through the switch selector 5 and the recording amplification circuit 6 and given to the rotary magnetic head 7, whereby the video tape 8 is provided with a predetermined format, for example, as shown in FIG. The recording video signal RVD for one field is recorded in each of the video regions TRV on one end side of the recording tracks TR which are sequentially formed obliquely based on the standard 8 mm VTR for home use as shown in FIG.

At the same time, the audio signal AD obtained from the microphone 11 is sent to the PC via the preamplifier circuit 12.
It is given to the M audio recording processing circuit 13. Recording audio signal R obtained from the PCM audio recording processing circuit 13
AD is applied to the rotary magnetic head 7 through the switch selector 5 and the recording / amplifying circuit 6 in sequence, whereby the PCM audio area T on the other end side of the recording track TR (FIG. 2).
The recording voice signal RAD is recorded in the RPCM.

Here, the audio signal AD can be recorded using various recording methods such as FM modulation in the PCM audio recording processing circuit 13 and then frequency-multiplexed and recorded in the video signal in the switch selector 5.

Camera integrated video tape recorder CVT
R is controlled by the system controller 15 so as to respond to a command signal given from an operation command circuit (not shown), that is, a recording command SR, a variable shutter selection command SS, a still reproduction shutter effect command SE, and the like. ..

When the variable shutter selection command SS is given, the system controller 15 gives the corresponding solid-state image pickup device drive signal S1 to the shutter speed control circuit 16 and the solid-state image pickup device driver 17, thereby the shutter speed control circuit. 16, the shutter pulse signal S2
And the transfer clock signals φ1 to φ3 and the charge sweep pulse signal φ4 are generated in the solid-state image pickup device driver 17 based on the shutter pulse signal S2.

The transfer clock signals .phi.1 to .phi.3 and the charge sweep pulse signal .phi.4 are given to the solid-state image pickup device 2, whereby the transfer clock signals .phi.1 to .phi.3 cause charges to be discharged from the shift register 2R at a timing of 1/60 [sec]. By reading out, the video signal VD is transmitted, and at the same time as this operation, the charge sweep pulse signal φ4 is controlled to sweep out the unnecessary charges CG from the sweep drain 2D.

Here, the transfer clock signals φ1 and φ2 represent horizontal and vertical transfer pulses, respectively, and the transfer clock signal φ3 represents a stored charge read pulse for driving the shift register 2R.

In addition to the above configuration, the camera-integrated video tape recorder CVTR has an identification code generating circuit 21, and a shutter pulse signal S2 obtained from the shutter speed control circuit 16 is supplied as a recording command signal from the system controller 15. SRX, variable shutter selection command signal SSX, and still reproduction shutter effect command signal SEX
In response to this, when the solid-state image pickup device 2 executes the shutter effect operation, an identification (ID) code signal S3 is generated at that timing to indicate that the image pickup with the shutter effect is performed.

In the case of this embodiment, the identification code generating circuit 2
When the solid-state image pickup device 2 receives the time information S4 indicating the image pickup time from the timer 22 and performs the image pickup operation with the shutter effect, an identification code signal S3 of 8 bits representing the time is generated.

The identification code signal S3 is sequentially passed through the switch selector 5 and the recording / amplifying circuit 6, and the rotary magnetic head 7 is supplied.
Of the recording track TR of the video tape 8 (FIG. 2), the identification code area T formed between the video area TRV and the PCM audio area TRPCM.
The identification code signal S3 is recorded in the RID.

In the camera-integrated video tape recorder CVTR shown in FIG. 1, in the normal recording mode, the system controller 15 generates transfer clock signals φ1 to φ3 in the solid-state image pickup device driver 17 in response to the recording command SR, and shifts the shift. By driving the register 2R by using the transfer clock signal φ3 (FIG. 3 (A)) as the accumulated charge read pulse, the charge accumulated in the cell corresponding to each pixel is transferred to the video signal as shown in FIG. 3 (B). Read as VD. At this time, the cell of each pixel stores the charge accumulated for 1/60 [sec] as a charge forming a video signal for one field every 1/60 [sec] read cycle T _R.
It is sent as video information for pixels.

On the other hand, the system controller 15
When the variable shutter selection command SS or the still reproduction shutter effect command SE is given simultaneously with the recording command SR,
Transfer clock signal φ in the solid-state image sensor driver 17
The charge sweep pulse signal φ4 is sent simultaneously with 1 to φ3.

Here, as shown in FIG. 3C, the timing at which the charge sweep pulse φ4 is generated is a time point before the shutter effect time T _S with reference to the transfer clock signal φ3 which is the accumulated charge read pulse. As a result, the solid-state image sensor driver 17 causes the charge sweep pulse φ to be generated after the previous transfer clock signal φ3 (FIG. 3A) is generated.
4 is generated, that is, the charge accumulated during the sweep time T _D is swept as the unnecessary charge CG by driving the sweep drain 2D by the charge sweep pulse φ4, and then the charge sweep pulse φ4 is generated. Time from generation to generation of next transfer clock signal φ3,
That is, the drain 2D swept out during the shutter effect time T _S
The solid-state imaging device 2 is operated so as to accumulate electric charge by not driving.

Thus, the accumulated charge amount sent out as the video signal VD at the timing when the transfer clock signal φ3 is generated is, as shown in FIG.
_The size corresponds to the length of _S , which makes it possible to obtain the video signal VD representing the subject image during the Shutter effect time T _S which is much shorter than the read cycle T _R, and the subject image is high in the end. Even if it moves at a speed, it can be recorded as an instantaneous image without being blurred practically.

In the case of this embodiment, the shutter effect time T _S
Is a variable shutter selection instruction S when the system controller 15 is provided with the variable shutter selection instruction SS.
The length becomes the length designated by S, and in response to this, the system controller 15 issues a still reproduction shutter effect command S.
When E is given, it becomes a predetermined constant value.

Further, as shown in FIG. 3, the solid-state image pickup device driver 17 outputs the charge sweep pulse φ4 to, for example, 1/2 [se
c] _occurs for each shutter effect imparting period T _SCYL and for adjacent field periods ( _hence , one frame period). In response to this, the switch selector 5 causes the magnetic tape 8 to move on the magnetic tape 8 as shown by a broken line in FIG. 2 recording tracks TRX formed at intervals of 30 recording tracks TR (recording tracks for 30 fields) corresponding to a cycle T _SCYL of 1/2 [sec] for still reproduction with recording tracks for 2 fields. A recording video signal RVD corresponding to the video signal VD to which the shutter effect is added is recorded in a recording track).

At the same time, the identification code generating circuit 21
At the timing of the still reproduction recording track TRX for recording the recording video signal RVD to which the shutter effect has been added, the identification code signal S3 representing the recording time of the two still reproduction recording tracks TRX is sequentially transmitted, thereby An identification code SID indicating that the recording track has a shutter effect is recorded in the identification code area TRID of the two still reproduction recording tracks TRX, and thus each recording track TR is reproduced when the recorded video tape 8 is reproduced. The recording track TRX for still reproduction in which the recording video signal S3 with the shutter effect is recorded by reading the recording information from the identification code area TRID of
It is possible to create a recorded video tape 8 that can identify the.

A recorded video tape 8 recorded by the camera-integrated video tape recorder CVTR shown in FIG.
Are reproduced by the video tape reproducing device PBD having the configuration shown in FIG.

The video tape reproducing device PBD reproduces the recorded video signal RVD from the recorded video tape 30 including the still reproduction mode.
The pick-up signal S11 reproduced by the reproduction head 31 from 0 is sequentially applied to the selector switch 33 via the reproduction amplifier circuit 32, and is separated into three kinds of signals in the selector switch 33.

That is, in the recording track TR (FIG. 2) of the recorded video tape 30, the reproduced audio signal S12 reproduced from the PCM audio signal area TRPCM is the PC.
After being PCM-decoded by the M audio reproduction processing circuit 34, it is output as an audio output signal S13 via the audio amplifier circuit 35.

Further, the reproduced video signal S14 composed of the luminance signal and the color signal reproduced from the video area TRV is the luminance signal /
The color signal reproduction processing circuit 36 performs reproduction processing and outputs the video output signal S15 via the video amplification circuit 37.

On the other hand, the identification code signal S16 reproduced from the identification code area TRID is discriminated by the discrimination code discriminating circuit 38, and the discrimination code data S17 representing the content thereof is displayed on the display device 39 which is, for example, a liquid crystal panel. It In the case of this embodiment, as the display contents, together with the recording time information indicating the address of the recording track TR,
An identification display indicating whether or not the still reproduction recording track TRX recorded with the shutter effect is reproduced is displayed.

Further, the identification code data S17 obtained from the identification code discrimination circuit 38 is supplied to the system controller 40, and the recording track TRX for still reproduction in which the recording video signal with the shutter effect is recorded or the identification code signal is recorded. Recorded track TR for playback
Preparation is made so that the recorded video tape 30 is stopped at a position where a recording track having a predetermined relationship with X can be reproduced and still reproduction is performed.

Thus, the system controller 40, based on the identification code data S17, the command signal given from the operation command circuit (not shown), that is, the reproduction command SP.
B, the playback command S in response to the still playback command SST, etc.
Capstan servo circuit 41 when PB is given
The capstan motor 42 is driven in the normal reproduction mode by the drive control signal S18 given to the recording track TR so that the recording signals can be sequentially reproduced from the respective recording tracks TR.

In addition to this, the system controller 40
Receives the still reproduction command SST together with the reproduction command SPB, the target still reproduction of the recorded video tape 30 based on the identification code data S17 in which the recording video signal of the recording track TR to which the shutter effect is added is recorded. A drive control signal S18 is sent to stop the recording track TRX for reproduction at a position for reproducing and control the state for executing still reproduction.

In actuality, in the still reproduction mode, the capstan servo circuit 41 actually takes a predetermined value after the drive control signal S18 representing the stop command is sent from the system controller 40 in consideration of the overrun of the drive system. After the lapse of the track amount, a response operation for stopping the recorded video tape 30 is performed.

According to the above configuration, the recording video signal RV to which the shutter effect is automatically _added every predetermined cycle T _SCYL.
By recording D on the video tape 8,
Even if the subject moves, it is possible to record an image with little blur at the timing of the recording track TRX for still reproduction that is periodic.

In addition to this, the identification code SID is recorded in the recording track TRX in which a video with less blurring is recorded by imparting the shutter effect periodically, so that when the reproduction is performed using this identification code signal. It is possible to reproduce the still image of a clearer image by stopping the tape at the position of the recording track TRX for still reproduction and reproducing the image with less blur.

On the other hand, at the time of reproduction, even if this periodic track TRX for still reproduction does not stand out practically, the influence on the image quality deterioration at the time of normal reproduction can be neglected practically.

FIG. 5 shows another embodiment of the present invention.
Unlike the standard of the 8 mm video tape recorder as in the case of FIG. 2, the recorded video tape 51 on which the recorded video signal is recorded by the recording format of the standard of the VHS video tape recorder is shown in a simplified manner.

In this case, the identification code SID for the still reproducing recording track TRX in which the recording video signal with the shutter effect is recorded is the servo control signal track TC formed along the longitudinal direction at the edge of the video tape 51. It is recorded so as to be superimposed on the control signal CTL.

In the case of the VHS system, the control signal CTL is recorded at the position corresponding to the recording position of each recording track TR by sequentially reversing the magnetization direction. As a method of superimposing the identification code SID on the control signal CTL, for example, a configuration in which the magnetization reversal period of the control signal CTL is changed according to the content of the identification code SID can be applied.

In the case of this embodiment, in order to stop the running of the recorded video tape 51 at the position of the still reproduction recording track TRX, the position of the recorded video tape 51 several tracks before the still reproduction recording track TRX. When the still reproduction mode is selected, the recorded video tape 51 which has detected the auxiliary identification code SIDX is run by inertia force, and when the identification code SID is subsequently detected, the video tape 51 is stopped. By doing so, the still reproduction recording track TRX can be reproduced still.

In the above-mentioned embodiment, the charge storage element of the solid-state image pickup device 2 is constituted by the CCD sensor, but the present invention is not limited to this, and for example, a MOS type charge storage element may be used. You can

Further, in the above-mentioned embodiment, the recording track TRX for still reproduction for giving the image with the shutter effect.
However, the present invention is not limited to this, and a plurality of tracks may be recorded if necessary.

In the above embodiment, the recording cycle T _SCYL of the still reproducing recording track TRX is 1/2 [sec].
Although the case of selecting (for 30 tracks) has been described, the present invention is not limited to this, and in short, it is sufficient if the interval does not affect the reproduced image when reproducing at the normal speed in practical use.

Further, in the above embodiment, the identification code SI
If D and SIDX are recorded by using the coding method disclosed in Japanese Patent Laid-Open No. 62-22278, the circuit configuration that has been conventionally used can be used as it is.
Further, it can be recorded together with various kinds of coding data of the conventional example.

In the above embodiment, the still reproducing recording track TRX recorded by utilizing the shutter effect.
Although the identification code SID is added only to the target track, by recording over several tracks before and after the track, even if there is inertia in the tape drive mechanism for tape running during still playback, the target still recording Track TRX
Can be selected without error.

For example, the tape may be designed to stop completely after the tape has been run for several tracks after the identification code signal is detected, and the still reproduction recording track TRX may be still reproduced. ..

[0053]

As described above, according to the present invention, the identification code signal is added to the recording track for still reproduction for recording on the video tape by adding the shutter effect, so that a still image with less blurring can be obtained. It is possible to realize a camera-integrated video tape recorder that can more easily record and reproduce a video signal on a recorded video tape.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a camera-integrated video tape recorder according to the present invention.

FIG. 2 is a schematic diagram showing a recorded video tape created by the camera-integrated video tape recorder of FIG.

FIG. 3 is a signal waveform diagram for explaining a shutter effect imparting function.

FIG. 4 is a block diagram showing a video tape reproducing apparatus for reproducing the recorded video tape of FIG.

FIG. 5 is a schematic diagram showing another embodiment of a recorded video tape.

[Explanation of symbols]

CVTR-camera integrated videotape recorder, PB
D ... Video tape reproducing device, 1 ... Lens, 2 ... Solid-state image sensor, 4 ... Luminance signal / color signal recording processing unit, 5 ...
... switch selector, 7 ... magnetic head, 8 ... video tape, 11 ... microphone, 13 ... PCM audio recording processing circuit, 15 ... system controller, 1
6 ... Shutter speed control circuit, 17 ... Solid-state image sensor driver, 30 ... Recorded video tape, 33 ...
Selector switch, 34 ... PCM video reproduction processing circuit, 36 ... Luminance signal / color signal reproduction processing circuit, 38 ...
Identification code discrimination circuit.

Claims (3)

[Claims] 1. An optical-electrical conversion element for taking out an optical video signal as a variation of accumulated electric charge, an electronic shutter means for controlling an electric charge accumulation time in the optical-electrical conversion element, and the electronic shutter means for a cycle. Control means for operating the electronic shutter means, an identification code generating means for outputting an identification code signal indicating that the electronic shutter means is periodically operated at the time of imaging by the optical-electrical conversion element, and the electronic shutter means are operated. A camera-integrated video, comprising: a recording means for recording the identification code signal in a recording track on a video tape in a predetermined relationship in accordance with a video signal output from the optical-electrical conversion element when the video signal is output. Tape recorder. 2. The camera-integrated video tape recorder according to claim 1, wherein the video signal output and the identification code signal are periodically recorded in a plurality of recording tracks. 3. An identification code signal recorded on a recorded video tape formed by a video tape recorder integrated with a camera is detected, and the video tape is stopped at a predetermined recording track synchronized with the identification code signal. A reproducing apparatus characterized by performing still reproduction.