JPH0548962A - Output video signal recording and reproducing device for telecine equipment - Google Patents

Abstract

PURPOSE:To improve image quality by recording/reproducing with two fields of a luminance signal and a half field of a color difference signal obtained with time axis compression as one unit to prevent the luminance signal and the color difference signal from being multipled. CONSTITUTION:First and second fields of the luminance signal from a telecine equipment 1 is synthesized into one frame of luminance signal in a synthesization circuit 4, and the band of the obtained signal is compressed and inputted to a synthesization circuit 9 by means of a 2-D oblique filter 5, a horizontal filter 7 and a subsamplling circuit 6. On the other hand, the color difference signal is compressed along time axis to 1/4 by a time axis compression circuit 8, the first and second fields of the color difference signal in a same frame are synthesized in a synthesization circuit 13, and the band of the obtained signal is compressed and inputted to the synthesization circuit 9. The synthesization circuit 9 synthesizes two fields of luminance signal and 1/2 fields of color difference signal into one unit and perform recording by means of such units. By reproducing such units, dot disturbance, cross-color and color shading can be prevented from occurring and the band of the luminance signal plus color difference signal can be widened.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an apparatus for recording and reproducing a video signal output from a telecine.

[0002]

2. Description of the Related Art In order to display an image such as a movie recorded on a film on a display such as a television receiver, it is recorded on a recording medium such as a video disk or a video tape. Number of frames per second and NTS
Since the number of images per second of the C system color television signal is different from 24:30, a telecine for converting a film image into a video signal is used. In this telecine, a film image is converted into a luminance signal Y and color difference signals BY and RY by a 2-3 pulldown system. The luminance signal Y and the color difference signals BY and RY are converted into a composite video signal by an encoder, and the composite video signal is recorded on a recording medium.

However, if the composite video signal is converted into a composite video signal in this way, since a luminance signal and a color signal are multiplexed in the composite video signal, there is a problem in that dot interference and cross color easily occur. It was In addition, since the color signals are modulated, there is a problem that the color unevenness is likely to occur due to the influence of the accuracy of the recording and reproducing system circuits, and the band of the color signals cannot be widened.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a telecine output video signal recording / reproducing apparatus capable of preventing the occurrence of dot interference, cross color and color unevenness and widening the bands of luminance signals and color signals. It is to be.

[0005]

A telecine output video signal recording apparatus of the present invention is an apparatus for recording a luminance signal and two color difference signals as a video signal obtained by converting a film image by a 2-3 pulldown type telecine on a recording medium. And n
2n field consisting of luminance signals for n frames (n is a positive even number)
And n / 2 fields obtained by time-compressing color difference signals for n frames are recorded as one unit.

The telecine output video signal reproducing apparatus according to the present invention comprises 2 luminance signals for n (n is a positive even number) frames.
Time field compression of n fields and color difference signals for n frames 1
A reproducing device for reading out a signal from a recording medium in which a field is recorded as one unit and reproducing it as a video signal. The color difference signal component in the read signal is time-axis expanded, and the read luminance signal and time-axis expanded 2 It is characterized in that two color difference signals are output in units of one field.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an encoder of a recording / reproducing apparatus according to the present invention. This encoder generates a component video signal to be written on a recording medium from the output signal of the telecine 1. The telecine 1 converts a film image into a luminance signal Y and color difference signals BY and RY of the NTSC method by the 2-3 pulldown method. That is, as shown in FIG. 2, the first frame of the film 51 is changed to the first frame of the first frame.
And the luminance signal Y and the color difference signals BY and R of the second field
-Y, the second frame of the film 51, the first of the second frame
And the second field and the first field of the third frame are converted into the luminance signal Y and the color difference signals BY and RY, which are repeated.

In the encoder, an LPF (low-pass filter) 2 to which the luminance signal Y output of the telecine 1 is supplied
Is provided. The LPF 2 limits the supplied luminance signal Y to a signal in a band of 8 MHz or less and supplies it to the A / D converter 3. The A / D converter 3 uses the luminance signal Y from the LPF 2.
Is sampled at a sampling frequency of 16 MHz and digitized. The synthesizing circuit 4 is connected to the output of the A / D converter 3. The synthesizing circuit 4 synthesizes the luminance signal of the first field and the luminance signal of the second field of the same frame.
A two-dimensional diagonal filter 5 is connected to the output of the synthesizing circuit 4 to eliminate a component whose resolution is visually unnecessary. Further, an in-frame offset subsampling circuit 6 is connected to the output of the two-dimensional diagonal filter 5. The sub-sampling circuit 6 sub-samples the luminance signal output from the two-dimensional diagonal filter 5 at a frequency of 8 MHz and supplies it to the horizontal filter 7. Horizontal filter 7 is 4MHz
The above processing removes the high frequency component. A synthesis circuit 9 is connected to the output of the horizontal filter 7, and the output signal of the synthesis circuit 9 is D / A.
It is output via the converter 19.

In the encoder, telecine 1
LPF 11 to which the color difference signals BY and RY output of
Is provided. The LPF 11 is supplied with the color difference signal B
-Y and RY are limited to signals in the band below 2 MHz and A
It is supplied to the / D converter 12. The A / D converter 12 is an LPF
The color difference signals BY and RY from 11 are sampled and digitized at a sampling frequency of 16 MHz. A
The time axis compression circuit 8 is connected to the output of the / D converter 12. The time axis compression circuit 8 extends the frequency band to 8 MHz by thinning out sampling points. A synthesis circuit 13 is connected to the output of the time axis compression circuit 8. The synthesizing circuit 13 synthesizes the color difference signal of the first field and the color difference signal of the second field of the same frame. A vertical filter 14 is connected to the output of the synthesizing circuit 13. The vertical filter 14 outputs 525 /
A vertical high frequency component of 4 (cycle / height) or more is removed and supplied to the scanning line thinning circuit 15. The scanning line thinning circuit 15 thins the number of scanning lines to 1/2. The output of the scanning line thinning circuit 15 is connected to a two-dimensional diagonal filter 16 for visually eliminating unnecessary components. Further, an in-frame offset sub-sampling circuit 17 is connected to the output of the two-dimensional diagonal filter 16. The sub-sampling circuit 17 sub-samples the luminance signal output from the two-dimensional diagonal filter 16 at a frequency of 8 MHz and supplies it to the horizontal filter 18. The output of the horizontal filter 18 is connected to the synthesis circuit 9.

In the encoder having such a structure, the luminance signal Y output from the telecine 1 is 8M by the LPF 2.
After the band is limited to below Hz, it is sampled by the A / D converter 3 at a sampling frequency of 16 MHz and converted into a digital signal. The synthesizing circuit 4 synthesizes the digitized luminance signals of the first field and the second field into a luminance signal of one frame. A two-dimensional spectrum representation of the combined luminance signal is as shown in FIG. The luminance signal of one frame is passed through the two-dimensional diagonal filter 5 so that the diagonal component is removed and the passing area becomes narrow as shown in FIG. 3 (b). The output signal of the two-dimensional diagonal filter 5 is sub-sampled by the in-frame offset sub-sampling circuit 6. That is, the A / D converter 3
If the sampling point at is the position of ● as shown in Fig. 4 (a), the phase is inverted between the first field and the second field as shown in Fig. 4 (b) by the offset sub-sampling in the frame. The folding is performed as shown in FIG. 3 (c). High frequency component of 4-8MHz before sub-sampling is 0-4M
Since it was folded back to Hz, 4 MHz was set by the horizontal filter 7.
Band components are compressed by removing high frequency components of z or more. The two-dimensional spectral representation after band compression is as shown in Fig. 3 (d). Also, since it is interpolated, the sampling points are as shown in Fig. 4 (c). The luminance signal thus band-compressed is supplied to the synthesizing circuit 9.

On the other hand, the color difference signals BY and RY output from the telecine 1 are band-limited to 2 MHz or less by the LPF 11, and then 16 MHz by the A / D converter 12.
It is sampled at a sampling frequency of z and converted to a digital signal. The time axis compression circuit 8 outputs the color difference signal to 1/4.
Compress the time axis. The synthesizing circuit 13 synthesizes the digitized color difference signals of the first field and the second field of each frame to make each of BY and RY a color difference signal of one frame, and two frames. -Combining the color difference signals of the colors. Since the color difference signals BY and RY output from the telecine 1 have a band of 2 MHz, the signal output from the time base compression circuit 8 has a bandwidth of 8 MHz and is output from the synthesis circuit 13. The signal comprises two consecutive frames of first and second field color difference signals BY and RY components. The color difference signal from the synthesizing circuit 13 is passed through the vertical filter 14, and then the scanning line thinning circuit 15 thins out the number of scanning lines to 1/2. Subsequent processing is similar to that for the luminance signal. That is, the two-dimensional diagonal filter 16 removes the diagonal component, the in-frame offset sub-sampling circuit 17 performs sub-sampling, and the horizontal filter 18 removes the high-frequency component of 4 MHz or more and performs band compression. The band-compressed continuous two-frame color difference signals of the first and second fields are passed through the synthesizing circuit 9 to D /
It is supplied to the A converter 19.

The synthesizing circuit 9 includes a first field of an odd frame and a second frame of an odd frame of two continuous frames of the luminance signal band-compressed by interlacing. Field, first field of even frame, second field of even frame, and color difference between first and second fields of two consecutive band-compressed frames 5 at the signal
It is converted into a video signal forming a field. This video signal is the output signal of the encoder, and this is recorded on a recording medium such as a video disk. Figure 5
Shows the flow of the above-mentioned operation of the encoder for the first and second frames of the film.

The signal read from the recording medium on which the video signal obtained by the encoder is recorded is restored by the decoder as a luminance signal and a color difference signal. The decoder is provided with the LPF 31 to which the read video signal is supplied as shown in FIG. LPF
Reference numeral 31 limits the read signal to a signal in a band of 4 MHz or less and supplies the signal to the A / D converter 32. A / D converter 3
Reference numeral 2 samples and digitizes the read signal from the LPF 31 at a sampling frequency of 16 MHz. A
A separation circuit 33 is connected to the output of the / D converter 32. The luminance / color difference separation circuit 33 separates and extracts a luminance signal component and a color difference signal component from the output signal of the A / D converter 32. The synthesizing circuit 34 is provided for the luminance signal component output of the separating circuit 33
Are connected. The synthesizing circuit 34 synthesizes the luminance signal of the first field and the luminance signal of the second field of the same frame and supplies them to the in-frame offset sub-sampling circuit 35. An interpolation circuit 37 is connected to the output of the sub-sampling circuit 35 via a two-dimensional diagonal filter 36. The luminance signal interpolated by the interpolation circuit 37 is supplied to the double speed conversion and Y, C time adjustment processing circuit 38. The intra-frame offset sub-sampling circuit 39, the two-dimensional diagonal filter 40, and the interpolation circuit 41 are also connected in order to the color difference signal component output of the separation circuit 33. The separation circuit 42 is connected to the output of the interpolation circuit 41. Separation circuit 42
Separates the color difference signal of the first field and the color difference signal of the second field. A time axis expansion circuit 43 is connected to the output of the separation circuit 42, and the output of the time axis expansion circuit 43 is supplied to the double speed conversion and Y, C time adjustment processing circuit 38. The double speed conversion and Y, C time adjustment processing circuit 38 has a memory and outputs a luminance signal and a color difference signal at a timing.

In the decoder having such a structure, the video signal read from the recording medium is 4M by the LPF 31.
After the band is limited to Hz or less, it is sampled by the A / D converter 32 at a sampling frequency of 16 MHz and converted into a digital signal, and after conversion, supplied to the luminance / color difference separation circuit 33. The separation circuit 33 separates and extracts a luminance signal component and a color difference signal component from the output signal of the A / D converter 32. The luminance signal component is supplied to the synthesis circuit 34. In the synthesizing circuit 34, the first field and the second field
The field digitized luminance signals are combined to form a one-frame luminance signal. A two-dimensional spectrum representation of the combined luminance signal is as shown in FIG. 7 (a). The luminance signal of one frame is sub-sampled by the in-frame offset sub-sampling circuit 35. This sub-sampling is similar to the operation of the in-frame offset sub-sampling circuit 6 shown in FIG. 4 (b). In the two-dimensional spectrum representation, folding is formed as shown in FIG. 7 (b) and the bandwidth becomes 8 MHz. .. The output signal of the sub-sampling circuit 35 is supplied to the two-dimensional diagonal filter 36, whereby the diagonal interference component due to folding is removed. In the two-dimensional spectral representation, the folded portion is removed as shown in FIG. 7 (c). The luminance signal that has passed through the two-dimensional diagonal filter 36 is interpolated by an interpolating circuit 37 and then supplied to a double speed conversion and Y, C time adjustment processing circuit 38.

The color difference signal components output from the separation circuit 33 are in-frame offset sub-sampling circuits 39 and 2.
Band extension processing is performed by the dimensional diagonal filter 40 and the interpolation circuit 41 in the same manner as the above-described luminance signal component, and a color difference signal in the band of 8 MHz is obtained. This color difference signal is the first of the two frames.
And the color difference signal of the second field, the separation circuit 4
The color difference signal B between the odd frame and the even frame depending on 2.
-Y and RY. Further, the color difference signal is expanded four times by the time axis expansion circuit 43 to become a band of 2 MHz and double speed conversion and Y, C time adjustment processing circuit 38.
Is supplied to.

Double speed conversion and Y, C time adjustment processing circuit 38
In the above, the timing is adjusted so that the luminance signal Y and the color difference signals B-Y and R-Y having 525 scanning lines are sequentially output in a field unit. That is, if it is output from the first frame, first, the first field of the first frame is the luminance signal Y and the color difference signal B- of the first field corresponding to the first frame of the film. Y, RY, and the second field of the first frame are the luminance signal Y and the color difference signals BY, R- of the second field corresponding to the first frame of the film.
Y, the first field of the second frame is the luminance signal Y and color difference signals BY, RY of the first field corresponding to the second frame of the film, and the second field of the second frame. The field is the luminance signal Y of the second field corresponding to the second frame of the film.
And the color difference signals BY, RY, the first field of the third frame is the luminance signal Y of the first field and the color difference signals BY, RY corresponding to the second frame of the film. , The third frame
The second field of the film is the luminance signal Y and the color difference signals BY and RY of the first field corresponding to the third frame of the film.
Is repeated and this is repeated. This double speed conversion and Y, C time adjustment processing circuit 38 is composed of D / A converters 44, 4
5, 46 are connected and D / A converted. Each D / A
The output video signal from the converter is supplied to a display (not shown) and displayed as an image. FIG. 8 shows the flow of the above-mentioned operation of the decoder for the first and second frames of the film.

[0017]

As described above, according to the present invention, the 2n file consisting of the luminance signals for n frames output from the telecine.
Field and n / 2 fields obtained by time-compressing color difference signals for n frames are recorded as one unit on a recording medium. In addition, a signal is read from the recording medium, the color difference signal component in the read signal is expanded in the time axis, and the read luminance signal and the two color difference signals expanded in the time axis are output in units of one field. Therefore, even if the video signal output from the telecine is recorded on the recording medium and the reproduced signal is not multiplexed with the luminance signal and the color signal, dot interference, cross color and uneven color are prevented. In addition, it is possible to widen the band of the luminance signal and the color signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an encoder.

FIG. 2 is a diagram showing an operation of a telecine.

FIG. 3 is a diagram showing a two-dimensional spectrum representation of a luminance signal in an encoder.

FIG. 4 is a diagram showing sampling points.

FIG. 5 is a diagram showing a flow of operation of an encoder.

FIG. 6 is a block diagram showing a configuration of a decoder.

FIG. 7 is a diagram showing a two-dimensional spectrum representation of a luminance signal in a decoder.

FIG. 8 is a diagram showing a flow of operation of the decoder.

[Explanation of symbols for main parts]

 1 Telecine 5, 16, 36, 40 Two-dimensional diagonal filter 6, 17, 35, 39 Sub-sampling circuit 7, 18 Horizontal filter 8 Time axis compression circuit 14 Vertical filter 15 Scan line thinning circuit 19, 44, 45, 46 D / A converter 37, 41 Interpolation circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Tajima, Keiichi Tajima 4-15-5 Omorinishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (72) Kenichiro Hosoi, 4-15 Omorinishi, Ota-ku, Tokyo 5 Pioneer Co., Ltd. Omori Plant (72) Inventor Shinichi Ogura 4-15 Omori Nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (72) Inventor Tomihiro Oguchi 4-Chome Omori Nishi, Ota-ku, Tokyo # 15-5 Pioneer Co., Ltd. Omori Plant (72) Inventor Yasuo Yagi 4-15-5 Omori Nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (72) Inventor Shigeru Iwaoka Omori Nishi, Ota-ku, Tokyo 4-15-5 Pioneer Co., Ltd. Omori Factory

Claims (5)

[Claims] 1. A recording device for recording on a recording medium a luminance signal and two color difference signals as a video signal obtained by converting an image of a film by a 2-3 pull-down type telecine, wherein n (n is a positive even number). ) A recording apparatus which records a 2n field consisting of luminance signals for frames and an n / 2 field obtained by time-compressing color difference signals for n frames as one unit. 2. A four field consisting of a luminance signal for two frames and one field obtained by time-compressing a color difference signal for two frames are recorded as one unit. Recording device. 3. An encoder for converting a luminance signal as a video signal converted by a 2-3 pull-down type telecine and two color difference signals into a recording signal for recording on a recording medium. , The encoder is
A / D conversion means for sampling the luminance signal and the two color difference signals at a predetermined frequency to convert them into digitizers, and first and second same frames output from the A / D conversion means.
First synthesizing means for synthesizing the digitized luminance signal of the field as a signal of one frame, and the digitized color difference signals of the first and second fields of the same frame outputted from the A / D converting means. Is combined as a signal into one frame, a time axis compression means for time axis compression of the output signal of the second synthesizing means to 1/4, and an output signal of the time axis compression means are continuous. The third synthesizing means for synthesizing only two frames and the scanning line 1 from the output signal of the third synthesizing means.
Scanning line thinning means for thinning out to 1/2, a two-dimensional diagonal filter for removing the output signal of the first combining means and the diagonal component of the scanning line thinning means, respectively, and a luminance signal and a color difference passed through the two-dimensional diagonal filter. Sub-sampling means for respectively sub-sampling the signal at a frequency half the predetermined frequency, band compression means for removing the high frequency component of each output signal of the sub-sampling means and performing interpolation processing, and output of the band compression means. A luminance field and a color difference signal are combined to form a 4 field and 2 field consisting of a luminance signal for 2 frames.
Fourth synthesizing means for outputting the recording signal in which one field consisting of color difference signals for one frame is set as one unit;
The recording apparatus according to claim 1, further comprising D / A conversion means for converting an output signal of the synthesizing means into an analog signal. 4. A recording in which a 2n field composed of luminance signals for n (n is a positive even number) frames and an n / 2 field obtained by time-compressing color difference signals for n frames are recorded as one unit. A reproducing device for reading a signal from a medium and reproducing it as a video signal, in which a color difference signal in a read signal is expanded in a time axis, and a read luminance signal and two color difference signals expanded in a time axis are output in units of one field. Playback device characterized by. 5. A signal read from a recording medium on which a recording signal in which one field is one field consisting of four frames of luminance signals for two frames and one field of color difference signals for two frames is recorded. The decoder has a decoder for restoring it as a video signal, and the decoder outputs from the A / D converting means for sampling the read signal at a predetermined frequency and converting it into a digitizer. First separating means for separating the generated signal into a luminance signal and a color difference signal, a first combining means for combining the luminance signal separated by the first separating means into a signal of one frame, and the first combining means. Subsampling means for respectively subsampling the luminance signal combined by the above and the color difference signal separated by the first separating means at a frequency half the predetermined frequency, and each output of the subsampling means A two-dimensional diagonal filter for removing diagonal components of the signal, an interpolating means for interpolating each output signal of the sub-sampling means, and a color difference signal interpolated by the interpolating means are separated into two frames. Second separating means, and time axis expanding means for expanding the color difference signals for two frames separated by the second separating means by four times in the time axis,
Second synthesizing means for timing-adjusting the luminance signal interpolated by the interpolating means and the color difference signal expanded in the time axis and outputting the luminance signal and the color difference signal in one field units. The reproducing apparatus according to claim 4, wherein