JPH1098645A - Image information conversion method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide image information on movie film with PAL and N
When converting to a TSC video signal, the frequency of damaging the movie film is increased by applying the movie film to the telecine device a plurality of times. SOLUTION: A telecine apparatus 11 reproduces image information on a movie film 10 photographed at 24 Fps at 25 Fps and converts it into a 625/50 video signal. The digital video tape recording device 12 converts the 625/50 video signal converted by the telecine device 11 into a video tape cassette 13.
At the same number of scanning lines / field frequency.
The digital tape player 14 converts the video tape cassette 13 on which the video signal is recorded to a field frequency of 50 Hz.
To play. The modifying digital video tape reproducing device 15 reproduces the video tape cassette 13 at a field frequency of 47.952 Hz. NTSC converter 16
Converts a 625 / 47.952 video signal into a 525/59.
The video signal is converted to 94 video signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information conversion method for optically reading image information photographed on a cinema film and converting the image information into a PAL and NTSC standard video signal.

[0002]

2. Description of the Related Art Conventionally, image information photographed on a cinema film is transmitted to an NTSC (National Television System Commi- nation).
tee) method and PAL (Phase Alternating by Line)
A system shown in FIG. 11 using a telecine device, which is an image reading device, has been considered to convert the video signal into a standard video signal.

A PAL video signal used mainly in Europe has a number of scanning lines (lines) / field frequency (H).
z) is 625/50. In contrast, the NTSC video signal used mainly in the United States and Japan is 5
25 / 59.94 (accurately the field frequency is 60 /
1.001 = 59.94005994. . . In Although,
Hereinafter, it is described as 525 / 59.94. ).

[0004] Normally, the motion picture film 141 is 24 times a second.
In the system shown in FIG. 11, a 625/50 PAL video signal is obtained at a playback speed of the telecine device 142 of 25 frames per second in the system shown in FIG.

On the other hand, 525/5 of the NTSC system is used.
For the 9.94 video signal, the reproduction speed of the telecine device 142 is set to 24 frames per second (exactly 24 / 1.001 = 23.9760239) in the same manner as the shooting speed.
8. . . ), The field frequency was converted to 59.94 Hz by the field frequency converter 143 to obtain the data.

[0006]

When the image information on the cinema film is converted into the PAL and NTSC video signals by the system shown in FIG. 11, the following problems occur.

First, in the above system, the PAL system 6
When obtaining a 25/50 video signal and NTSC format 5
The telecine device 142 is used twice to obtain a 25 / 59.94 video signal. The telecine device 2 is expensive and it is rare that one user owns a plurality. For this reason, occupying the telecine device 142 deteriorates its use efficiency.

Further, in the telecine device 142, the movie film 141 is run at a constant speed or intermittently fed by, for example, a sprocket meshing with both side perforations formed in the width direction of the movie film 141. By applying the movie film 141 to the telecine device 142 several times, the frequency of damaging the movie film 141 increases.

The PAL system 6 obtained by the above system
25/50 video signal and NTSC 525/5
Before broadcasting the 9.94 video signal, it is common to edit each of them, but in this case, 625/5
Two master tapes are required for a video signal of 0 and a video signal of 525 / 59.94.

Also, NTSC system 525 / 59.94.
Of the video signal of the PAL system is only 0.1% longer than that of the original movie film 141.
In a 25/50 video signal, movie information captured at 24 frames per second in the conversion process is 25/50 per second.
The performance time is shortened by about 4% because the frame is reproduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image information conversion method in which the use of a telecine device is performed once, thereby increasing the use efficiency and reducing the frequency of damaging a movie film. .

Another object of the present invention is to provide an image information conversion method that can use only one master tape.

It is a further object of the present invention to provide an image information conversion method for making the performance time of the above two types of video signals practically the same as the performance time of a movie film.

[0014]

In order to solve the above-mentioned problems, the image information conversion method according to the present invention converts image information on a cinema film taken at a predetermined number of frames per second into a first conversion step. Converts the image signal into a video signal having 625 scanning lines / field frequency of 50 Hz.
The recording step is to record the video signal of 625/50 from the recording medium at a field frequency different from the field frequency of 50 Hz used in the first conversion step. The conversion step 2 converts the video signal into an NTSC 525 / 59.94 video signal.

Here, the image information conversion method includes another reproduction step of reproducing the recording medium on which the 625/50 video signal has been recorded in the recording step at a field frequency of 50 Hz. May be used.

In the case where the first conversion step reproduces image information on a cinema film shot at 24 frames per second at a speed of 25 frames per second, the second
In the conversion step, the field frequency of the video signal obtained in the reproduction step is increased to 5/4 times.

In the case where the first conversion step reproduces the image information on the cinema film taken at 25 frames per second at the same speed, the second conversion step is performed in the video image obtained in the reproduction step. 6/5 field frequency of signal
Double it.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the image information conversion method according to the present invention will be described below. First,
A first embodiment will be described with reference to FIGS. In the first embodiment, image information on the movie film 10 photographed at 24 frames per second, that is, at a frame rate of 24 frames per second (Fps) is converted into a PAL scanning line 625 (books) / field frequency 50 (Hz). ), And an image information conversion method to which an image information conversion method for converting into an NTSC 525 / 59.94 image signal is applied.

This image information conversion system uses 24 Fps.
Image information on the movie film 10 taken at 25 Fp
s, and a telecine device 11 that converts the video signal into a 625/50 video signal, and 62 converted by the telecine device 11.
A digital video tape recorder 12 for recording a 5/50 video signal on a video tape cassette 13 at the same number of scanning lines / field frequency, and a video on which a 625/50 video signal is recorded by the digital video tape recorder 12. A digital tape reproducing device 14 for reproducing the tape cassette 13 at a field frequency of 50 Hz;
625 by the digital video tape recorder 12
Video tape cassette 1 on which a / 50 video signal is recorded
3 with a field frequency of 47.952 Hz (60
/1.001×4/5=47.95204795 ...
However, it is described as 47.952 below. ) And the 625 / 47.952 video signal obtained by the modified digital video tape reproducing apparatus 15 is converted to 525/5.
And an NTSC converter 16 for converting the image signal into a 9.94 video signal.

The NTSC converter 16 converts the 625 from the modified digital video tape playback device 15
A scanning line number conversion device 17 for converting the number of scanning lines of a video signal of /47.952 into 525 lines, and a field frequency of 5
Field frequency converter 18 for converting to 9.94 Hz
Consisting of

The movie film 10 has a perforation 10a for feeding the film on both sides in the width direction. The telecine device 11 runs the movie film 10 at a constant speed by a sprocket meshing with the perforation 10a, and converts the image information of each frame into a 625/50 video signal.

FIG. 2 shows the configuration of the telecine apparatus 11. The telecine device 11 is mounted such that the movie film 10 is pulled out from a supply reel 21 and wound up on a take-up reel 27 via guide rollers 22, tension rollers 23, guide rollers 24, drive rollers 25 and guide rollers 26. The film running system is provided with an information reading unit 30 provided between the guide roller 24 and the driving roller 25 of the film running system.
Image information and audio information are optically read from 0, a video signal and an audio signal are generated by the signal processing unit 40 from the read signal, and output to the digital video tape recorder 12 from each signal output terminal 51, 52. It has become.

The supply reel 21, the drive roller 25, and the take-up reel 27 of the film running system function as transport means for transporting the movie film 10 at a constant speed, and are respectively driven and controlled by a motor control circuit 28. The movie film 10 is rotated by a drive motor.
At a constant speed.

The tension roller 23 has one end provided at the tip of a tension arm 23B elastically urged by a tension coil spring 23A.
The tension is kept constant by rolling contact with the movie film 10 with the elastic biasing force of 3A. And
The movie film 10 is mounted on the tension controller 2
While the tension is kept constant at 3, the drive roller 25 travels at a constant speed and winds up the take-up reel 27. The drive roller 25 rotates the movie film 10 at a constant speed by rotating the movie film 10 at a constant speed while holding the movie film 10 therebetween.

The information reading section 30 optically reads various kinds of information imprinted on the movie film 10 between the guide roller 24 and the drive roller 25 of the film running system. And a CCD linear sensor 32 that receives the information reading light emitted from the light source 31 via the movie film 10. This CCD linear sensor 32
Are arranged corresponding to the full width of the Information reading unit 3
0 indicates that the CCD linear sensor 32 reads information for the entire width of the movie film 10 running at a constant speed on the film running system at every unit time, and supplies the read signal to the signal processing unit 40.

Further, the signal processing section 40 is provided with an A / D converter 41 to which a read signal is supplied from the CCD linear sensor 32 of the information reading section 30. The A / D converter 41 reads the digitized read signal. A buffer memory 42 to which data is supplied, a screen position control block 43 to which the read data is read and supplied from the buffer memory 42, an image processing block 44 and an audio processing block 45, and a screen A video timing block 46 to which frame timing information is supplied; a D / A converter 47 to which video data is supplied from the image processing block 44;
The D / A converter 47 includes an encoder 48 to which a video signal obtained by converting the video data into an analog signal is supplied, a D / A converter 49 to which audio data is supplied from the audio processing block 45, and the like.

The buffer memory 42 stores information reading unit 3
The A / D converter 41 digitizes the read signal from the 0 CCD linear sensor 32 and temporarily stores the read data. The read data temporarily stored in the buffer memory 42 includes image information obtained by digitizing a read signal for the screen area of the movie film 10, frame position information, control information of each frame, digital audio information, and the like. .

The reading of the read data from the buffer memory 42 is performed by the screen position control block 43.
Is controlled by a video timing block 46 on the basis of the frame timing information of the screen supplied from the CPU. The image information, the frame position information, the control information of each frame, the digital audio information, etc. are separated from the buffer memory 42. Read out. Then, the frame position information and control information of each frame are supplied to the screen position control block 43, the image information is supplied to the image processing block 44, and the digital audio information is supplied to the audio processing block 45. Supplied to

The screen position control block 43 generates film feed control information and screen frame timing information from the frame position information and the control information of each frame, and supplies this information to the motor control circuit 28, The timing information is transferred to the video timing block 4
6

The motor control circuit 28 drives the respective drive motors according to the control information to control the rotation of the supply reel 21, the drive roller 25 and the take-up reel 27 of the film running system. 10 is run at a constant speed.

In the telecine apparatus 11, the motor control circuit 28 drives each drive motor according to the control information so that the movie film 10 photographed at 24 Fps is reproduced at 25 Fps.
1. The rotation of the drive roller 25 and the take-up reel 27 is controlled.

The image processing block 44 includes a frame memory for temporarily storing image data for one frame, and performs image processing such as color correction and screen size correction on the image information. The image processing block 44 supplies the video data subjected to the image processing to the D / A converter 47. Then, the D / A converter 47 is connected to the image processing block 4
Then, the image information subjected to the image processing is converted into an analog signal and supplied to the encoder 48. The encoder 48 has a D
The video signal converted into an analog signal by the / A converter 47 is converted into a video signal conforming to a predetermined television system such as Hi-Vision, and this video signal is output from the output terminal 51 to the digital video tape recorder 12.

The audio processing block 45 performs an audio process such as an error correction process on the digital audio information read from the buffer memory 42. The audio processing block 45 supplies the digital audio data subjected to the audio processing to the D / A converter 49. Then, the D / A converter 49 converts the digital audio data subjected to the audio processing by the audio processing block 45 into an analog signal. This D
An audio signal converted into an analog signal by the / A converter 49 is output from the signal output terminal 52 to the digital video tape recorder 12.

As described above, the cinema film 10 originally photographed at 24 Fps is reproduced at 25 Fps from the telecine apparatus 11 to the digital video tape recording apparatus 12.
5/50 video and audio signals will be supplied.

As the digital video tape recording device 12, for example, a D-1 format video tape recording device (hereinafter, referred to as a D-1 video tape recording device) can be used. The D-1 videotape recorder is C
CIR. Rec. So-called 4: 2: 2 corresponding to 601
This is a standard video tape recording device based on the component coding system. Therefore, when the D-1 video tape recording device is used as the digital video tape recording device 12, the video signal supplied from the telecine device 11 is a 4: 2: 2 component encoding video signal. I have.

FIG. 3 shows a schematic configuration of a video and audio processing system of the D-1 video tape recording apparatus. The component video signals Y, BY, and RY output by the telecine device 11 via the output terminal 51 are converted by the A / D converter 61 into digital video signals Y, Cb, and Cr, respectively. These digital video signals Y, Cb, Cr are supplied to a source coding circuit 62.

The source coding circuit 62 encodes the digital video signals Y, Cb, and Cr using a weight order code. This is, for example, 8
This is a coding process for converting a bit code in accordance with a code arranged in the order of weight. As a result, the influence of an error that cannot be detected by the error correction code and remains on the screen is reduced. The digital video signals Y, Cb, Cr encoded by the source coding circuit 62 are supplied to an inter-sector shuffling circuit 63.

The inter-sector shuffling circuit 63 performs shuffling in the inter-sector on the digital video signals Y, Cb, Cr. Rear outer encoder 6
The error correction code (ECC) performed in step 4 can detect the presence of an error but cannot correct the error. In this case, the processing is performed so as to be inconspicuous due to the modification. However, if the modified pixels are concentrated in the screen, the image quality deterioration cannot be ignored.
For this purpose, the inter-sector shuffling circuit 63 changes the order of generation of image codes and the order of recording codes in the inter-sector. The shuffling output of the inter-sector shuffling circuit 63 is supplied to the outer encoder 64.

The outer encoder 64 adds an ECC code to the shuffling output. Specifically, the shuffling output is divided into blocks of a predetermined length, and a 2-word Reed-Solomon product code (check code) for an outer code is generated and added by a predetermined operation. Outer encoder 64
Is supplied to an intra-sector shuffling circuit 65.

The intra-sector shuffling circuit 65
A shuffling process is performed on the intra sector of the encoded output. Specifically, the two-dimensionally arranged codes after the generation of the outer check code are rearranged as randomly as possible in the same two-dimensional block.

On the other hand, an analog audio signal output from the telecine device 11 via the output terminal 52, for example, R, L
The A / D converter 66 converts the channel signal into a digital audio signal. This digital audio signal is supplied to a pre-processing circuit 67 and subjected to pre-processing,
This is supplied to the blocking circuit 68.

The blocking circuit 68 blocks the audio signal and supplies it to the outer encoder 69. The outer encoder 69 adds an ECC code to the blocked audio signal and supplies the audio signal to the shuffling circuit 70. The shuffling circuit 70 shuffles the encoded output.

The video shuffling output from the intra-sector shuffling circuit 65 and the audio shuffling output from the shuffling circuit 70 are supplied to a multiplexing circuit 71.

The multiplexing circuit 71 time-division multiplexes the video shuffling output and the audio shuffling output. This multiplexed output is supplied to the inner encoder 72.

The inner encoder 72 adds a common inner code (inner code), which is a kind of ECC code, to the multiplexed output. This encoded output is supplied to the synchronization / ID addition circuit 73.

The audio signal and the video signal are configured in a common format called a synchronous block. The synchronous / ID adding circuit 73 adds a synchronous pattern and an ID pattern indicating a block number to two inner code blocks. The data is output to the scramble circuit 74 as one sync block.

The scramble output from the scramble circuit 74 is supplied as a recording current to a head 76 via a recording amplifier 75 and a rotary transformer, and is digitally recorded on a magnetic tape 77 by unsaturated recording suitable for high-density recording.

A digital video tape recorder such as a D-1 video tape recorder can improve the image quality and sound quality of a recording signal and the dubbing characteristics as compared with an analog video tape recorder. The reproduction image quality by digital recording mainly depends on the encoding parameters, and is hardly affected by the recording / reproduction characteristics. For example,
The waveform distortion of the reproduced image is only the distortion of the analog circuit before and after the A / D and D / A conversion. Also, distortion during recording and playback,
The noise causes an error in the reproduced code and causes a deterioration in image quality. However, if the error rate is equal to or less than a certain value, the error can be corrected or corrected by using an error correction code. For these reasons, digital recording can be expected to have higher image quality,
This is particularly noticeable during dubbing.

The video signal from the telecine unit 11 is recorded on the magnetic tape 77 of the video tape cassette 13 at 625/50 by the D-1 video tape recording device which is the digital video tape recording device 12. A video tape cassette 13 in which a video signal of the 625/50 standard is recorded by the digital video tape recorder 12 is
D-1 in the playback system of the AL system and the playback system of the NTSC system
By using the video tape reproducing device as the digital video tape reproducing device 14 and the modifying digital video tape reproducing device 15, a common master video tape cassette 13 can be obtained.

The use of one master video tape cassette 13 means that the telecine device 11 is used only once, so that the frequency of damaging the cinema film 10 having a very high software value can be reduced.

Even when editing the NTSC video signal, the master video tape cassette 13 on which the 625/50 video signal is recorded is used.
0 can be edited, and the vertical resolution can be improved.

If the digital video tape reproducing device 14 reproduces the magnetic tape 77 of the master video tape cassette 13 at the field frequency of 50 Hz as it is, the PA
An L-type 625/50 video signal can be obtained. In this case, the reproduction time of the video signal is reduced by 4% because it depends on the tape speed of 25 Fps reproduction in the telecine device 11. For example, a 120-minute movie
Reproduction as a 5/50 video signal will end in 115 minutes.

As the digital reproducing device 14, a D-1 video tape reproducing device can be used.

FIG. 4 shows a schematic configuration of a video and audio processing system of the D-1 video tape reproducing apparatus. The digital signal recorded on the magnetic tape 77 of the master video tape cassette 13 is reproduced by a reproducing head 81 and then amplified by a reproducing amplifier 82. The reproduction output of the reproduction amplifier 82 is supplied to the synchronization / ID detection circuit 83.

The synchronization / ID detection circuit 83 detects a synchronization signal and an ID from the reproduced output, and clarifies a signal break and a block number.

The descrambling circuit 84 descrambles the reproduction output and supplies the descrambled reproduction signal to the inner decoder 85.

The inner decoder 85 performs error correction using the inner code added to the reproduction signal, and supplies the output to a data separation circuit 86.

The digital video signal separated by the data separation circuit 86 is supplied to an intra-sector deshuffling circuit 87, and the digital audio signal is supplied to a deshuffling circuit 92.

Intra-sector deshuffling circuit 87
De-shuffles the digital video signal in the intra sector, and supplies the component digital video signals Y, Cb, and Cr to the outer decoder 88.

Digital video signals Y, Cb, and Cr that have been subjected to error correction using an outer code in outer decoder 88.
Are supplied to a D / A converter 91 via an inter-sector deshuffling circuit 89 and a source decoder 90. D /
The A converter 91 outputs the digital video signals Y, Cb,
Cr is converted to an analog component video signal Y, B-
Y and R-Y are output after conversion.

On the other hand, the deshuffling circuit 92 deshuffles the digital audio signal separated by the data separation circuit 86. The digital audio signal from which the shuffling has been performed is subjected to error correction processing by an outer decoder 93 and then supplied to a D / A converter 96 via a post-processing circuit 94 and an audio concealment circuit 95.

The D / A converter 96 converts the digital audio signal into an analog audio signal, and outputs it as, for example, R and L channel audio signals.

On the other hand, the master video tape cassette 1
In order to obtain a video signal of 3 to 525 / 59.94, it is necessary to perform reproduction using the modified digital video tape reproducing device 15. The modified digital video tape reproducing device 15 can also use a D-1 video tape reproducing device. In this case, the configuration of the video and audio processing system of the D-1 video tape reproducing apparatus is also shown in FIG.
The description is omitted here.

In this modified digital video tape reproducing apparatus 15, the servo system is configured as shown in FIG.
The 625/50 video signal recorded on the magnetic tape 77 of the master video tape cassette 13 is reproduced at a field frequency of 47.952 Hz.

The synchronizing signal separating circuit 101 extracts a horizontal synchronizing signal from the input reference signal and supplies it to a phase locked loop (PLL) circuit 102. This PLL circuit 1
Numeral 02 uses a voltage controlled oscillator circuit (voltage controlled oscillator, VCO) with variable LC, as will be described later. The value of C changes according to the field frequency of the input reference signal, and the frequency of the oscillation clock is changed. Can be varied. The clock output from the PLL circuit 102 is supplied to a vertical (V) synchronization (SYNC) generator 103. The vertical synchronization signal generated by the VSYNC generator 103 is transmitted to the drum servo system 104 and the capstan servo system 1.
10 is supplied. The VSYNC generator 103 also generates various clocks required for the video and audio processing systems, but the description is omitted here.

In the drum servo system 104, the phase comparator 106 compares the phase of the drum rotation pulse (PG) from the drum motor 105 with the above-mentioned vertical synchronizing signal, and supplies the phase control signal to the inverting input terminal of the operational amplifier 107. doing.
The operational amplifier 107 is also supplied with a speed control signal detected by the speed detector 109 from a frequency generation (FG) pulse from the drum motor 105. The operational output of the operational amplifier 107 is amplified by the drive amplifier 108 and then supplied to the drum motor 105, which is used to correct the rotational speed and rotational phase of the drum motor 105.

In the capstan servo system 110, the phase of the signal obtained by dividing the reproduction control signal by the frequency divider 115 and the vertical synchronizing signal are compared by the phase comparator 112, and the phase control signal is input to the inverting input of the operational amplifier 113. Supply to terminal. The operational amplifier 113 includes a capstan motor 11
Speed detector 11 from frequency generation (FG) pulse from
The speed control signal detected by 6 is also supplied. The operational output of the operational amplifier 113 is amplified by the drive amplifier 114 and then supplied to the capstan motor 111, which is used to correct the rotational speed and rotational phase of the capstan motor 111.

FIG. 6 shows the configuration of the PLL circuit 102. The PLL circuit 102 includes a phase comparator 121, a low-pass filter 122, a VCO 123, and a frequency divider 124.

The phase comparator 121 is a synchronizing signal separating circuit 1
The phases of the horizontal synchronizing signal separated and extracted in step 01 and the clock obtained by dividing the output clock of the VCO by a predetermined dividing ratio are compared.

The output of the low-pass filter 122 is V
The VCO 123 is supplied to the CO 123. The VCO 123 changes the LC value according to the filter output, and the generated clock can be switched by a reference signal supplied to the servo system 100 such as 47.952 Hz, 49.95 Hz or 50 Hz. .

Therefore, in the modifying digital video tape reproducing device 15, the field frequency is 47.
By inputting a 625 / 47.952 reference signal of 952 Hz, a 625/50 video signal is
It can be reproduced as a 47.952 video signal.

The 525 / 47.952 video signal obtained by the modifying digital video tape reproducing device 15 is supplied to the NTSC conversion section 16 and is supplied to the 525/5
It is converted to a 9.94 video signal.

As described above, the NTSC conversion unit 16
It comprises a scanning line number converter 17 for converting the number of scanning lines of a 625 / 47.952 video signal into 525 lines, and a field frequency converter 18 for converting a field frequency to 59.94 Hz.

The number-of-scanning-lines conversion device 17 interpolates 625 scanning lines into 525 scanning lines (line interpolation). The scanning line number conversion device 17 vertically filters 625 scanning lines from 576 active lines to 486 active lines to obtain 525 scanning lines. Since the vertical resolution in the case of 625 scanning lines is higher than the vertical resolution in the case of 525 scanning lines, loss of the vertical resolution in the resampling process is eliminated, and high image quality can be expected.

The field frequency conversion device 18 includes:
The field frequency of 952 Hz is multiplied by 5/4 to 5
To convert to 9.94 Hz, a so-called 3: 2 pull-down process is performed.

The so-called 3: 2 bull down processing will be described with reference to FIGS. 7 and 8. A video signal having a field frequency of 47.952 Hz is scanned by interlacing, and the even field of the input side 18a is converted to the output side 18b.
Are converted so that the odd field of the input side 18a becomes the odd field of the output side 18b.
Since the video signal on the input side 18a is based on the video output of the telecine device 11, there is no time difference in the same frame. Therefore, the video signal converted to the output side 18b does not cause any inconvenience in time. For every four frames on the input side, one new frame is created on the output side. However, since no inconvenience occurs in the field order within the frame, the movement does not seem unnatural.

The playback time of the 525 / 59.94 video signal obtained by the NTSC converter 16 is longer than the normal playback time of the movie film 10 by 0.1%.

As described above, the image information conversion system according to the first embodiment converts a movie film 10 shot at 24 Fps into a 625/50 video signal of the PAL system and a 525 / 59.94 of the NTSC system. It can be converted to a video signal.

In this case, the master video tape cassette 1
3 means that the use of the telecine device 11 is performed only once.
Can be less frequent. Also, the NTSC system uses a 625/50 master video tape cassette,
Since 525 scanning lines are formed by line interpolation from 625 scanning lines, higher image quality can be expected than in the case of conversion using 525 scanning lines from the beginning. Further, the modifying digital video tape reproducing device 15 only needs to change the PLL circuit of the existing D-1 video reproducing device and change the external reference signal, so that the cost can be reduced.

Next, a second embodiment will be described with reference to FIGS. 9 and 10.

In the second embodiment, image information on the movie film 20 photographed at 25 Fps is converted into a PAL scanning line 625 (line) / field frequency 50 (Hz) video signal and an NTSC 525. This is an image information conversion system to which an image information conversion method of converting an image signal into a /59.94 video signal is applied.

The difference between this image information conversion system and the first embodiment is that the movie film 20 photographed at 25 Fps is reproduced at 25 Fps by the telecine apparatus 11 and the modified digital video tape reproducing apparatus 131 is used. Reproduction of a field frequency of 49.95 Hz
(Accurately 50 / 1.001 = 49.950004995
, But will be described as 49.95 below. ), And the field frequency conversion in the field frequency conversion device 133 of the NTSC conversion unit 132 is made 6/5 times. The other components are the same as those in the first embodiment, and a detailed description thereof will be omitted.

The digital video tape recording device 12 comprises:
625/50 reproduced by the telecine device 11 at 25 Fps
Is recorded on the video tape cassette 13.
The digital video tape recorder 12 uses 625/5
A video tape cassette 13 on which a video signal of the standard 0 is recorded is a PAL-type playback system and an NTSC-type playback system, which are a D-1 video tape playback device, a digital video tape playback device 14, and a modified digital video tape playback device. By using it as 131, a common master video tape cassette 13 can be obtained.

The use of one master video tape cassette 13 means that the telecine device 11 is used only once, so that the frequency of damaging the cinema film 10 having a very high software value can be reduced.

Further, even when editing the NTSC video signal, the master tape 13 on which the 625/50 video signal is recorded is used, so that the 625/50 editing can be performed and the vertical resolution can be improved. it can.

If the digital video tape reproducing device 14 reproduces the magnetic tape 77 of the master video tape cassette 13 as it is at a field frequency of 50 Hz, PA
An L-type 625/50 video signal can be obtained. In this case, the reproduction time of the video signal can be made exactly the same since the reproduction of the movie film 20 of the 25 Fps recording by the telecine device 11 is performed at the same speed of 25 Fps.

Modify digital playback device 131
Indicates that the servo system is configured as shown in FIG.
6 is configured as shown in FIG. 6, and a 625 / 49.95 reference signal having a field frequency of 49.95 Hz is input from the outside, and the 625/50. The video signal is reproduced so as to have a field frequency of 49.95 Hz.

The 525 / 49.95 Hz video signal obtained by the modifying digital video tape reproducing apparatus 131 is supplied to the NTSC conversion section 132 and
It is converted to a 5 / 59.94 video signal.

As described above, the NTSC conversion unit 132 sets the number of scanning lines of the 625 / 49.95 video signal to 525.
It is provided with a scanning line number conversion device 17 for converting into a book, and a field frequency conversion device 133 for converting a field frequency to 59.94 Hz.

The scanning line number conversion device 17 interpolates 625 scanning lines into 525 scanning lines (line interpolation). The scanning line number conversion device 17 vertically filters 625 scanning lines from 576 active lines to 486 active lines to obtain 525 scanning lines. Since the vertical resolution in the case of 625 scanning lines is higher than the vertical resolution in the case of 525 scanning lines, loss of the vertical resolution in the resampling process is eliminated, and high image quality can be expected.

The field frequency converter 133
The field frequency of 9.95 Hz is 6/5 times 5
To convert to 9.94 Hz, so-called 3: 2: 3:
A 2: 2 pull-down process is performed.

The so-called 3: 2: 3: 2: 2 pull-down processing will be described with reference to FIG. A video signal having a field frequency of 49.95 Hz is interlaced and converted so that the even field of the input 133a becomes the even field of the output 133b and the odd field of the input 133a becomes the odd field of the output 133b. Since the video signal on the input side 133a is based on the video output of the telecine device 11, there is no time difference within the same frame. Therefore, the video signal converted to the output side 133b does not cause any inconvenience in terms of time. For every five frames on the input side, one new frame is created on the output side. However, since no inconvenience occurs in the field order within the frame, the movement does not seem unnatural.

Note that the 525 / 59.94 video signal obtained by the NTSC converter 132 is longer than the movie film 20 by 0.1%.

As described above, the image information conversion system according to the second embodiment converts a movie film 20 photographed at 25 Fps into a PAL 625/50 video signal and an NTSC 525 / 59.94 video signal. It can be converted to a video signal.

In this case, the master video tape cassette 1
Since only three are required, the telecine device 11 is used only once, and the frequency of damaging the movie film 20 can be reduced. Also, in the NTSC system, a 625/50 master video tape cassette is used, and 525 scanning lines are formed by line interpolation from 625 scanning lines. Therefore, higher image quality can be expected than in the case of converting from 525 original scanning lines.

Also, since the movie film 20 shot at 25 Fps is used, when converted to a video signal, a 525 / 59.94 video signal and a 625/5
The video signal of 0 has a performance time practically the same as the performance time of the movie film.

Further, the modifying digital video tape reproducing device 131 is a PL of the existing D-1 video reproducing device.
Since it is only necessary to change the L circuit and change the external reference signal, the cost can be reduced.

In the first and second embodiments, the digital video tape reproducing device and the modified digital video tape reproducing device use the 625/5
Although a video signal of 0 and a video signal of 525 / 59.94 are both obtained, any of them may be selectively operated to obtain any of the video signals.

Also, using only the modified digital video reproducing apparatus, 625/50 and 625 / 47.95
2 or the 625/50 and 625 /
A video signal of 49.95 may be reproduced. In this case, the operation of the NTSC converter for obtaining 525 / 59.94 is made selective.

[0100]

According to the image information converting method of the present invention, the first converting step converts the image information on the cine film photographed at a predetermined number of frames per second into a number of scanning lines of 625 (lines) / field frequency of 50. (Hz) video signal.
The recording step records a 25/50 video signal on a recording medium,
After reproducing a video signal of 625/50 in the reproducing step from the recording medium at a field frequency different from the field frequency of 50 Hz used in the first converting step, the second converting step converts the video signal into an NTSC 525 signal. Since the video signal is converted into a video signal of /59.94, the use of the telecine device can be reduced to one time, the usage efficiency can be increased, and the frequency of damaging the movie film can be reduced. Also, only one master tape can be used.

In the case where the first conversion step reproduces the image information on the cinema film taken at 25 frames per second at the same speed, the second conversion step is performed by using the video information obtained in the reproduction step. 6/5 field frequency of signal
Since it is doubled, the performance time of the video signal of the above two systems can be made practically the same as the performance time of a movie film.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of an image information conversion method according to the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a telecine device used in the first embodiment.

FIG. 3 is a block diagram of a video and audio processing system of a D-1 video tape recording device applicable to the digital video tape recording device used in the first embodiment.

FIG. 4 is a block diagram of a video and audio processing system of a D-1 video tape reproducing apparatus applicable to the digital video tape reproducing apparatus used in the first embodiment.

FIG. 5 is a block diagram of a servo system of a D-1 video tape reproducing apparatus applicable to the modifying digital video tape reproducing apparatus used in the first embodiment.

FIG. 6 is a block diagram showing a specific example of a PLL circuit of the servo system.

FIG. 7 is a diagram showing interlaced scanning used for explaining a so-called 3: 2 bull-down process of the field frequency conversion device used in the first embodiment.

FIG. 8 is a principle diagram of so-called 3: 2 bull-down processing performed by the field frequency conversion device used in the first embodiment.

FIG. 9 is a block diagram of a second embodiment of the image information conversion method according to the present invention.

FIG. 10 is a principle diagram of a so-called 3: 2: 3: 2: 2 pull-down process performed by the field frequency conversion device used in the second embodiment.

FIG. 11 is a block diagram showing a configuration of a conventional image information conversion system.

[Explanation of symbols]

10 movie film, 11 telecine device, 12 digital video tape recording device, 13 master video tape cassette, 14 digital video tape reproducing device,
15 Modified digital video tape playback device,
16 NTSC converter, 17 Scan destination number converter, 18
Field frequency converter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kiriyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Tomoyoshi Kato 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation (72) Inventor Hiroaki Kikuchi 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Luke Freeman 94065 Redwood City Compass Circle 560, California, United States of America

Claims (6)

[Claims] 1. An image information conversion method for converting image information on a cinema film into a standard video signal, comprising: converting image information on a cinema film taken at a predetermined number of frames per second into the number of scanning lines (lines) / field Frequency (H
z) a first conversion step of converting to a video signal having 625/50, a recording step of recording the 625/50 video signal converted in the first conversion step on a recording medium, A reproducing step of reproducing the video signal from a recording medium on which a 625/50 video signal is recorded at a field frequency different from the field frequency of the first conversion step; .94
A second conversion step of converting the image signal into a video signal. 2. A reproducing method for reproducing a video signal having a field frequency of 50 Hz from a recording medium on which a 625/50 video signal has been recorded in the recording step, wherein the reproducing method is used by switching from the reproducing step. 2. The image information conversion method according to claim 1, wherein: 3. The method according to claim 1, wherein the first conversion step is performed at a rate of 2 seconds per second.
2. The image information conversion method according to claim 1, wherein the image information on the movie film photographed in four frames is reproduced at a speed of 25 frames per second. 4. The method according to claim 3, wherein the second conversion step includes a field frequency conversion step of making the field frequency of the image information obtained in the reproduction step 5/4 times. Image information conversion method. 5. The method according to claim 1, wherein the first conversion step comprises:
2. The image information conversion method according to claim 1, wherein the image information on the movie film taken in five frames is reproduced at the same speed. 6. The method according to claim 5, wherein the second conversion step includes a field frequency conversion step of making the field frequency of the video signal obtained in the reproduction step 6/5 times. Image information conversion method.