JPH10174124A - Video data processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To process plural kinds of video data whose frequency band differs. SOLUTION: A reproduction device 14 applies reproduction/interpolation to video data of 4:2:0 band to obtain 4:2:2 band, which is fed to a changeover device 18. The changeover device 18 detects a frequency band flag added to the video data and only when the video data with the band flag added to them are not in violation of a band limit, band limit is conducted to prevent production of loopback distortion in the case of thinned out processing. Then the changeover device 18 applies thinned out processing to a chroma signal of the video data subject to band limit in a vertical direction with respect to a line to generate the video signal of 4:2:0 band and prescribed edit processing is conducted. Moreover, the changeover device 18 applies interpolation processing to the edited video data to obtain 4:2:2 band, which is outputted. A recording device 22 thins the video data outputted from the changeover device 18 into the 4:2:0 band, which is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital sampling interface standard [CCIR601].
(ITU-R601)], when video data of the 4: 2: 2 band and video data of the 4: 2: 0 band are mixed, the quality of the video data is reduced while suppressing the deterioration of the quality. The present invention relates to a video data processing device that can perform editing processing and the like collectively.

[0002]

2. Description of the Related Art For example, a digital sampling interface standard (C
In the case where video data of the 4: 2: 2 band of the CIR 601) is thinned in the vertical direction with respect to the line to generate video data of the 4: 2: 0 band, first, in order to prevent aliasing after the thinning, a low pass is performed. After the band is limited in the horizontal direction by the filter (LPF), the chroma component thinning process is performed. The video data thus thinned out and set to the 4: 2: 0 band is subjected to a predetermined process such as a superimposition process with video data of another 4: 2: 0 band, and further interpolated. It is interpolated by the filter and output as 4: 2: 2 band video data.

As described above, it may be necessary to further perform band limiting and thinning-out processing on video data that has been subjected to band limiting, thinning-out processing, and interpolation processing to perform editing processing and the like. Here, in the band limitation prior to the decimation process, since the characteristics of the low-pass filter are not picture ideal,
The amount of information in the pass band of the video data is always lost, and the quality of the video data deteriorates. On the other hand, when the thinning process is further performed on the video data that has been subjected to the band limitation prior to the thinning process at least once, the band limitation is not necessary.

However, conventionally, it has not been possible to determine whether or not video data has already been subjected to band limitation and thinning processing. In addition, the video data that has been subjected to the decimation process has been uniformly subjected to the decimation process after the band limitation, so that the quality of the video data subjected to the decimation process a plurality of times is unnecessarily deteriorated. That was the result.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a video data processing apparatus which can collectively process a plurality of types of video data having different bands. Aim. Also, the present invention
It is an object of the present invention to provide a video data processing device in which the quality of video data is less deteriorated even when the thinning process and the interpolation process are repeated for a plurality of types of video data having different bands.

[0006]

In order to achieve the above object, a first video data processing apparatus according to the present invention limits a band of a first video data which is not band-limited to a predetermined range. Band limiting means for generating the second video data, and a first bandwidth flag indicating that the bandwidth is not limited is added to the first video data, and a second bandwidth flag indicating that the bandwidth is limited is added. Flag adding means for adding the band flag of the second video data to the second video data.

[0007] Preferably, the flag adding means converts the first band flag or the second band flag and the first video data or the second video data into a predetermined transmission packet. Multiplex at the position.

Preferably, a video data thinning means for generating the third video data by reducing a band of the video data by thinning a predetermined component of the second video data in a direction perpendicular to a line. Have more.

Preferably, the first video data and the second video data are video data of 4: 2: 2 band of digital sampling interface standard (CCIR601), and the video data thinning means is , The chroma component at the same position of the first video data or the second video data is thinned out every other line in the vertical direction.
The third video data of the 2: 0 band is generated.

[0010] The first video data processing device according to the present invention can detect the presence or absence of a band limitation so that appropriate thinning processing can be performed on video data depending on whether or not the band limitation has been performed. Generates video data. In the first video data processing device according to the present invention, the band limiting unit includes:
First video data that has never been subjected to band limitation [for example, digital sampling interface standard (C
4: 2: 2 original video data of CIR 601) is filtered by a low-pass filter prior to the thinning process, and the band is limited to a range in which aliasing is not generated by the thinning process. 2
The second video data of the band is generated.

[0011] The flag adding means adds a first band flag indicating that the band is not limited to the original video data which has never been subjected to the band limitation, and performs the band limitation once or more. For the passed video data,
A second band flag indicating that the band is restricted is added. The first band flag and the second band flag are:
For example, SDI used when transmitting video data
The packet is multiplexed in the ancillary data area of the (SMPTE-259M) transmission packet and transmitted together with the video data.

The video data thinning means converts the chroma component of the band-limited 4: 2: 2 second video data, for example, every other line (in a direction perpendicular to the line).
The third video data of the 4: 2: 0 band is generated by thinning. The third video data thus generated is recorded on, for example, a VTR device or the like.

[0013] The second video data processing apparatus according to the present invention further comprises a band flag detecting means for detecting the band flag from the first video data to which a band flag indicating whether the band has been reduced is added. Filtering the first video data only when the detected bandwidth flag indicates that the bandwidth of the first video data is not reduced, and setting the bandwidth of the first video data within a predetermined range. Between the band limiting means for generating the second video data by restricting the first video data or the second video data in the vertical direction with respect to the line to generate the third video data. And a video data processing unit for performing predetermined processing on the generated third video data.

Preferably, the first video data and the band flag are multiplexed at predetermined positions of a predetermined transmission packet, respectively, and the band flag detecting means is configured to multiplex the band flag at a predetermined position of the transmission packet. Detect band flag.

Preferably, the third processing is performed after a predetermined processing.
Video data interpolation means for interpolating the video data in the vertical direction with respect to the line to generate fourth video data in the same band as the first video data.

Preferably, the first video data and the second video data are video data of 4: 2: 2 band of digital sampling interface standard (CCIR601), and the video data thinning means is , The chroma component of the first video data or the second video data is thinned out every other line in the vertical direction to 4: 2: 0.
The second video data of the band is generated, and the video data processing means performs a predetermined process on the second video data of the 4: 2: 0 band, and performs the predetermined processing on the second video data of the 4: 2: 0 band. Third
Is generated.

Preferably, the video data interpolation means includes:
The fourth video is obtained by interpolating each of the thinned chroma components of the 4: 2: 0 band of the third video data in the vertical direction from the corresponding chroma component of the third video data in an adjacent line. Generate data.

The second video data processing device according to the present invention performs, for example, a predetermined process such as an editing process on video data to which a band flag has been added by the first video data processing device according to the present invention. I do. In the second video data processing device according to the present invention, the band flag detecting means includes:
For example, a band flag (a first band flag or a second band flag) indicating whether the band of video data multiplexed in the data region is reduced from the ancillary data region of the transmission packet of the SDI system. Is detected.

The band limiting means indicates that the band flag detected by the band flag detecting means is the first band flag, and that the first video data is the original 4: 2: 2 band video data. In this case, the first video data is filtered by a low-pass filter, the band of the first video data is limited to a range where aliasing does not occur after the thinning-out processing, and the second video data is generated.
Also, the band limiting unit, when the band flag detected by the band flag detecting unit is the second band flag, and indicates that the first video data is video data that has passed the band restriction once or more, The first video data is passed through without any further band limitation to obtain second video data.

As in the first video data processing device according to the present invention, the video data decimation means converts the chroma component of the second video data of the band-limited 4: 2: 2 band into, for example, one line. Every vertical thinning 4:
The third video data of the 2: 0 band is generated. The video data processing unit performs a predetermined process such as an editing process on the third video data generated by the video data thinning unit. The video data interpolating means filters the third video data of the 4: 2: 0 band, which has been edited by the video data processing means, using an interpolation filter, for example. The video data is interpolated using, for example, the chroma components of the corresponding pixels on the adjacent line to generate fourth video data.
The fourth video data thus generated is supplied to, for example, the outside of the video data processing device.

According to a third aspect of the present invention, there is provided a third image data processing apparatus, wherein band detecting means for detecting whether or not the band of the first image data is reduced, and wherein the band of the first image data is reduced. Band limiting means for filtering the first video data only when it is detected that the first video data is not detected, and limiting the bandwidth of the first video data to a predetermined range to generate second video data; 1st video data or 2nd
Of video data in the vertical direction with respect to the line
And a video data processing means for performing a predetermined process on the generated third video data.

[0022]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing a configuration of an editing system 1 according to the present invention. As shown in FIG. 1, the editing system 1 includes an editing console 10, an editing control unit 12, a first playback device (player # 1).
14, second playback device (player # 2) 16, switching device 18
And a recording device 22. With these components, the editing system 1 uses the 4: 2: 2 band video data VIN # 1 to VIN # 3 of the digital sampling interface standard (CCIR601) input from three input terminals, and the playback device 14, 1
6 is reproduced in the 4: 2: 0 band or the 4: 1: 1 band, and interpolated and edited together with the video data in the 4: 2: 2 band, and the edited data obtained by the editing process is processed. The video data VOUT is output to the outside or recorded in the recording device 22.

Hereinafter, the configuration and operation of each part of the editing system 1 will be described. The editing control unit 12 controls each component of the editing system 1 in accordance with an operation performed on the editing console 10 by an editor. That is, the edit control unit 12 controls the playback devices 14 and 16 to play back video data, and controls the switching device 18 to control the video data (S14 and S16) played back by the playback devices 14 and 16 and the external device. Edit processing of video data VIN # 1 to VIN # 3 input from
The recording device 22 is controlled to record the edited video data VOUT (S18) generated by the switching device 18.

FIG. 2 shows the reproducing apparatuses 14 and 16 shown in FIG.
FIG. 3 is a diagram showing the configuration of FIG. As shown in FIG.
Reference numerals 4 and 16 have the same configuration, and include a reproducing unit 140, an interpolation filter 142, and an output processing unit 24. These components operate under the control of the editing control unit 12. The reproducing unit 140 is a recording medium that records 4: 2: recorded on a video tape or a magneto-optical disk (MO).
The video data of the 0 band or the 4: 1: 1 band is reproduced and output to the interpolation filter 142.

FIG. 3 shows the interpolation filter 142 shown in FIG.
FIG. 3 is a diagram showing the configuration of FIG. As shown in FIG. 3, the interpolation filter 142 applies one
2n delay circuits 260 _n for giving a delay time for a line
To 260- _{n + 1} , the video data input from the reproduction unit 140, and the video data delayed by the delay circuits 260n to 260- _{n + 1} , respectively, with weighting factors an to
by multiplying the a-n weights (n + 1) of the weighting circuit 262 _n ~262 _-n, weighting circuit 262 _n ~ 26
Addition circuit (Σ) 264 for calculating the sum of video data weighted by 2- _n, addition circuit 26 input to input terminal a
A switch circuit (SW) 266 that selects the fourth output video data or the output image data of the weighting circuit 262 _0, a configuration of the low-pass filter of FIR type. The weighting circuit 2 when the number of taps is 3, 7, 11
62 _n -262 _-n weighting coefficients a0, a ± 1, a ±
Numerical examples of 2, a ± 3, a ± 4, and a ± 5 are as shown in Table 1 below.

[0026]

A1; a ± 2; a ± 3; a ± 4; a ± 5; number of taps 3: 1; 数; 0; 0; 0; 1; 9/16; 0; -1/16; 0; 0; 11; 1: 150/256; 0; -25/256; 0; 3/256;

Referring further to FIG. 4, interpolation filter 142
Will be described. FIGS. 4A to 4D show digital sampling interface standards (CCIR601).
The relationship between the 4: 2: 2 band video data and the 4: 2: 0 band video data, and the 4: 2: 0 band video data is interpolated in the vertical direction. FIG. 4 is a diagram illustrating a method for generating video data.

The video data of the 4: 2: 0 band is shown in FIG.
In FIG. 4A, a chroma signal of 4: 2: 2 band video data indicated by a circle is added to every other line as indicated by a triangle in FIG. 4B. Generated by vertical thinning. Interpolation filter 142
Is obtained by filtering the video data of the 4: 2: 0 band to convert the thinned chroma signal into a chroma signal of a corresponding pixel on an adjacent line as shown by an arrow in FIG. To interpolate in the vertical direction. That is, when the interpolation filter has three taps, a chroma signal indicated by a triangle is generated using the chroma signal indicated by a circle of two adjacent lines, and a chroma signal indicated by a triangle is generated when the interpolation filter has seven taps. 4 generates a chroma signal indicated by a circle using a chroma signal indicated by a circle of a plurality of nearby lines, and FIG.
As shown in (D), the original 4: 2: 2 band video data is generated (vertical mode).

When the interpolation filter 142 operates in the vertical mode, the switch circuit 266 outputs the chroma signal (○) at the position not thinned out as shown in FIG. b and weighting circuit 262 ₀
4 is output as it is, and the video data input from
When outputting the chroma signal (△) at the thinned-out position shown in (C), the chroma signal reproduced by interpolation input from the adder circuit 264 is output. As described above, when the chroma signals output from the switch circuit 266 are alternately selected for each line, the interpolation filter 142 can not only interpolate the thinned chroma signal (△) as usual by filtering but also does not thin out the chroma signal (△). Chroma signal (○
Unnecessary interpolation processing is performed on the mark () to change its value, thereby preventing a problem that the quality of the video data is rather deteriorated.

In the interpolation filter 142 (FIG. 3), the delay circuits 260 _{n to} 260 _{-n + 1} delay the video data by one pixel (one clock), and the switch circuit 266 switches the input terminal every clock cycle. By changing so that a and b are alternately selected, the 4: 2: 1 band video data is interpolated in the vertical direction with respect to the line, and 4: 2: 2 is interpolated.
Band image data can be generated.

Referring to FIG. 5, a method of generating video data of 4: 2: 2 band by interpolating video data of 4: 1: 1 band by the interpolation filter 142 whose operation has been changed will be described. . FIGS. 5A to 5E show the digital sampling interface standard (CCIR601) of 4:
The relationship between the 2: 2 band video data and the 4: 1: 1 band video data, and the 4: 2: 1 band video data is interpolated in the horizontal direction to convert the 4: 2: 2 band video data. FIG. 6 is a diagram illustrating a generation method.

The video data of the 4: 1: 1 band is shown in FIG.
The chroma signal of 4: 2: 2 band video data indicated by a circle in FIG. 5A is horizontal with respect to the line every other pixel as indicated by a triangle in FIG. 5B. Generated by decimating in the direction. The interpolation filter 142
By filtering the video data in the 4: 1: 1 band, the decimated chroma signal is converted to the chroma signal of the adjacent pixel as shown by an arrow in FIG. The line is interpolated in the horizontal direction in synchronization with the clock signal shown in (E) to generate the original 4: 2: 2 band video data as shown in FIG. 5D (horizontal mode).

When the interpolation filter 142 operates in the horizontal mode, similarly to the case where the interpolation filter 142 operates in the vertical mode,
The switch circuit 266, when outputting a chroma signal of the position that is not thinned out as shown in FIG. 5 (C) (○), the image data input by selecting an input terminal b from the weighting circuit 262 ₀ When outputting as it is and outputting the chroma signal (△) at the thinned-out position shown in FIG. 5C, the chroma signal reproduced by interpolation input from the adder circuit 264 is output. As described above, when the chroma signal output from the switch circuit 266 is alternately selected for each pixel, the interpolation filter 142 can not only normally interpolate the thinned chroma signal (△) by filtering but also does not thin out the chroma signal (△). Unnecessary interpolation processing is performed on the chroma signal (marked by ○), the value of which is changed, and the problem that the quality of video data is rather deteriorated can be prevented.

FIG. 6 is a diagram showing a configuration of the output processing unit 24 shown in FIG. FIGS. 7A and 7B are diagrams illustrating an operation in which the output processing unit 24 (FIG. 2) adds a band flag to video data. As shown in FIG. 6, the output processing unit 24
Are a horizontal band bit generation circuit 240, a vertical band bit generation circuit 242, AND circuits 244 and 246, a switch circuit (SW) 248, and an interface circuit (I / F) 2.
50 and a synchronization signal generation circuit 252.

The horizontal band bit generation circuit 240 and the vertical band bit generation circuit 242 generate the horizontal band bit and the vertical band bit (Table 2) of the band flag, and output them to the AND circuits 244 and 246. The synchronization signal generation circuit 252 generates a synchronization signal shown in FIG. 7B from a horizontal synchronization signal or the like, and outputs it to the switch circuit 248.

The AND circuit 244 calculates the logical product of the horizontal band bit input from the horizontal band bit generation circuit 240 and the least significant (0th) bit of the video data input from the interpolation filter 142, and the switch circuit 248 Output to The AND circuit 246 calculates the logical product of the horizontal band bits input from the vertical band bit generation circuit 242 and the first bit of the video data input from the interpolation filter 142, and outputs the result to the switch circuit 248.

The switch circuit 248 selects the input terminal b when the synchronizing signal shown in FIG. 7B has a logical value of 1 (H), and performs an AND operation on the lower two bits of the video data input from the interpolation filter 142. The band flags input from the circuits 244 and 246 are multiplexed. Interface circuit 25
2 is, for example, an SDI (SMPTE-
259M), multiplexes video data, control data, and the like into transmission packets and outputs the multiplexed data.

The output processing unit 24 multiplexes the video data interpolated by the interpolation filter 142 into transmission packets of the SDI system, for example, as shown in FIG. Further, the output processing unit 24 is configured as shown in FIG.
As shown in (B), a synchronization signal indicating a predetermined position of an ancillary data (ANC) area used for transmission of control data and audio data in a transmission packet of the SDI system is generated, and synchronized with the synchronization signal. A band flag having a 2-bit configuration (a chroma horizontal band bit and a chroma vertical band bit) is multiplexed into an SDI transmission packet. The value of the band flag is, for example, as shown in Table 2 below.

[0038]

(Table 2) Chroma horizontal band bit; Chroma vertical band bit; Video data band; 1; 1; 4: 2: 2; 0; 1; 4: 1: 1; 1; 0; 4: 2. : 0; 0; 0; 4: 1: 0;

As can be seen from Table 1, the fact that the value of the chroma vertical band bit is 0 means that the chroma signal is thinned out every other line as shown in FIG. The fact that the value of the chroma vertical band bit is 1 indicates that the chroma signal is not thinned out every other line. Further, the fact that the value of the chroma horizontal band bit is 0 indicates that the chroma signal is thinned out every other pixel as shown in FIG. 5B, and the value of the chroma horizontal band bit is 1 Indicates that the chroma signal is not thinned out every other pixel.

The fact that at least one of the chroma horizontal band bit and the chroma vertical band bit is 0 means that these bits (band flags) are added as described later with reference to FIGS. This indicates that the video data that has been subjected to the band limitation in order to prevent the occurrence of aliasing distortion prior to the thinning processing.

FIG. 8 is a diagram showing the configuration of the switching device 18 shown in FIG. 8, the same components as those of the reproducing devices 14 and 16 shown in FIG. 2 among the components of the switching device 18 are denoted by the same reference numerals. As shown in FIG. 8, the switching device 18 includes an input processing circuit 180, selection circuits (SEL) 182, 184, a low-pass filter 2
6, 28, thinning circuits 190 and 192, editing processing circuit 1
94, an interpolation filter 142, and an output processing unit 24, which operate under the control of the editing control unit 12;
Video data of 2: 2 band is converted to 4: 2: 0 band or 4: 2: 0 band.
The data is converted into video data of 1: 1 band and a predetermined editing process is performed.

The input processing circuit 180 controls the video data VIN # input from outside under the control of the editing control unit 12.
1, VIN2, and video data S14 and S16 input from the playback devices 14 and 16 to a band flag [FIG.
(A), Table 2] is detected. The selection circuit 182 selects one of the video data VIN # 1, S14, and S16,
Output to the low-pass filter 26. Selection circuit 18
4 selects any one of the video data VIN # 2, S14 and S16 and outputs it to the low-pass filter 28.

FIG. 9 shows the low-pass filter 2 shown in FIG.
It is a figure which shows the structure of 6,28. In FIG. 9, among the components of the low-pass filters 26 and 28, FIG.
The same components as those of the interpolation filter 142 shown in FIG. As shown in FIG. 8, the low-pass filters 26 and 28 have the same configuration, and similarly to the interpolation filter 142, the delay circuits 260 _{n to} 260 _{−n + 1} , the weighting circuits 262 _{n to} 262 _−n , the addition circuit 264 It has a switch circuit 266 and constitutes an FIR type low-pass filter.

In the low-pass filters 26 and 28, the weighting coefficients a0, a ± 1, and a ± 1 of the weighting circuits 262 _{n to} 262 _-n when the number of taps is 3, 7, and 11, respectively.
Numerical examples of 2, a ± 3, a ± 4, and a ± 5 are as shown in Table 3 below.

[0045]

(Table 3); a0; a ± 1; a ± 2; a ± 3; a ± 4; a ± 5; the number of taps; 3; 1/2; 1/4; 0; 0; 0; 0. 7; 1/2; 9/32; 0; -1/32; 0; 0; 11; 1/2; 150/512; 0; -25/512; 0; 3/512;

The delay circuits 260 _{n to} 260 _{-n + 1} are:
Similarly to the interpolation filter 142, when operating in the vertical mode for processing signals in the 4: 2: 0 band, a delay time of one line is given to each input video data. When operating in the horizontal mode for processing a signal of one band, a delay time of one pixel is given to each input video data.

The switch circuit 266 of the low-pass filters 26 and 28 is used when the values of the horizontal band bit and the vertical band bit of the band flag of the video data selected by the selection circuits 182 and 184 are both 1 (the selection circuits 182 and 184 select). Input terminal a is selected only when the input video data is original), and the input terminal b is selected otherwise. By selecting the above-described switch circuit 266, only the video data that has never been subjected to the band limitation is band-limited, and the band-limited video data is passed through at least once, so that the quality of the already band-limited video data is improved. Is prevented from being unnecessarily reduced.

The editing control unit 12 includes a thinning circuit 19
To cause 0,192 to generate video data in the 4: 2: 0 band, the delay circuits 260 _{n to} 260 _{-n + 1} are set to the vertical mode, and conversely, video data in the 4: 1: 1 band is generated. In this case, the delay circuits 260 _{n to} 260 _{-n + 1} are set to the horizontal mode. Prior to the decimation processing by the decimation circuits 190 and 192, the low-pass filters 26 and 28 generate the video data input from the selection circuits 182 and 184 based on the settings by the editing control unit 12 described above. Filtering is performed in accordance with the band of the video data to be processed, thereby preventing the occurrence of aliasing distortion in the thinning processing.

When the thinning circuits 190 and 192 (FIG. 8) generate the video data of the 4: 2: 0 band in accordance with the settings of the editing control unit 12, they are shown in FIGS. 4A and 4B. Decimating the chroma signal perpendicular to the line as follows:
When generating video data of a 1: 1 band, FIG.
As shown in (A) and (B), the thinning process is performed by thinning out the chroma signal horizontally with respect to the line, and the 4: 2: 0 band or the 4: 1: 1 band obtained as a result of the thinning process is obtained. The video data is output to the editing processing circuit 194.

The editing processing circuit 194 performs predetermined editing processing (multiple processing) on the video data input from the thinning circuits 190 and 192 under the control of the editing control unit 12 in accordance with the operation of the editor on the editing console 10. ) And outputs the edited video data to the interpolation filter 142.

The interpolation filter 142 is provided for the reproducing devices 14 and 1
6 (FIGS. 1 and 2), the edit processing circuit 19
Interpolation processing is performed in accordance with the 4: 2: 0 band or the 4: 1: 1 band of video data input from step 4:
It generates video data of two bands and outputs it to the output processing unit 24. The output processing unit 24 converts the video data input from the interpolation filter 142 and the band flag under the control of the editing control unit 12 into, for example, a SDI transmission packet [FIG.
(A)], and multiplexes it at a predetermined position and outputs the multiplexed signal.

FIG. 10 is a diagram showing the configuration of the recording device 22 shown in FIG. In FIG. 10, the same reference numerals are given to the same components of the recording device 22 as those of the switching device 18 shown in FIG. FIG.
As shown in FIG. 2, the recording device 22 includes an input processing circuit 220,
Selection circuit 222, low-pass filter 26, thinning circuit 1
90 and a recording unit 228.

The input processing circuit 220 operates under the control of the editing control section 12 to input video data VIN #
3 and video data S18 input from the switching device 18
, A band flag [FIG. 7 (A), Table 2] is detected. The selection circuit 222 selects one of the video data VIN # 3 and S18 and outputs it to the low-pass filter 26.

The low-pass filter 26 is connected to the switching device 18
Similarly to (FIG. 8), according to the control of the editing control unit 12 based on the value of the band flag detected by the input processing circuit 220, of the video data input from the selection circuit 222,
Only the video data that has never undergone the band limitation is filtered, and the band limitation is performed so that aliasing distortion does not occur in the thinning circuit 190. Thinning circuit 190
Operates in the vertical mode or the horizontal mode according to the control of the edit control unit 12, as in the switching device 18.
The recording unit 228 generates video data of the 4: 2: 0 band or 4: 1: 1 band from the video data of the 4: 2: 2 band.
Output to The recording unit 228 includes a thinning circuit 190
Is recorded on a recording medium such as a video tape or MO disk.

Image of 4: 2: 2 band and 4: 2: 0 band
Operation when Image Data is Handled Hereinafter, the operation of the editing system 1 will be described by taking as an example a case where each component of the editing system 1 processes video data of 4: 2: 2 band and 4: 2: 0 band. . Editing control unit 12
(FIG. 1) controls the playback devices 14 and 16 (FIGS. 1 and 2) to reproduce / interpolate 4: 2: 0 band video data and switch 4: 2: 2 band video data. The device 18 is supplied.

In the switching device 18, the input processing circuit 18
0 (FIG. 8) detects the band flag [FIG. 7 (A), Table 2] from the input video data. The switching device 18
Video data S14, S1 of the video data input to
The value of the vertical band flag of 6 is 0, and the value of the horizontal band flag is 1
The values of the vertical band flag and the horizontal band flag of the video data # 1 and # 2 that have not been subjected to the band limitation are both 1. The selection circuits 182 and 184 select, for example, the video data S14 and the video data # 2 that have been subjected to the band limitation,
Output to the low-pass filter 28.

The low-pass filter 26 (FIGS. 8 and 9)
The video data S14 input from the selection circuit 182 is passed through and output to the thinning circuit 190. The low-pass filter 28 operates in the vertical mode, filters the video data # 2 input from the selection circuit 184, limits the band, and outputs it to the thinning circuit 192. The thinning circuits 190 and 192 operate in the vertical mode, respectively, and thin out the chroma signal in the vertical direction with respect to the line as shown in FIGS.
Output to

The edit processing circuit 194 includes the thinning circuit 19
A predetermined editing process is performed on the video data input from 0,192. The interpolation filter 142 (FIG. 3) operates in the vertical mode, interpolates the 4: 2: 0 band video data input from the editing processing circuit 194, and performs 4: 2:
It generates video data of two bands. The output processing unit 24 multiplexes the input video data and the band flag into an SDI transmission packet and outputs the multiplexed transmission data to the recording device 22.

In the recording device 22, the input processing circuit 22
0 (FIG. 10) is a band flag [FIG. 4 (A), Table 2] from video data # 3 and S18 input from the switching device 18.
Is detected. The selection circuit 222 includes, for example, the video data S
18 is selected and output to the low-pass filter 26.

The low-pass filter 26 includes a selection circuit 222
Video data S1 that has been input from
Pass through 8. The thinning circuit 190 operates in the vertical mode and generates video data of the 4: 2: 0 band from video data of the 4: 2: 2 band. The recording unit 228 records the thinned video data.

Video in 4: 2: 2 band and 4: 1: 1 band
Operation when Image Data is Handled Hereinafter, the operation of the editing system 1 will be described by taking as an example a case where each component of the editing system 1 processes video data of 4: 2: 2 band and 4: 1: 1 band. . Editing control unit 12
(FIG. 1) controls the reproducing devices 14 and 16 (FIGS. 1 and 2) to reproduce and interpolate the video data of the 4: 1: 1 band and switch the video data of the 4: 2: 2 band. The device 18 is supplied.

In the switching device 18, the input processing circuit 18
0 (FIG. 8) detects the band flag [FIG. 7 (A), Table 2] from the input video data. The switching device 18
Video data S14, S1 of the video data input to
The value of the vertical band flag of 6 is 1 and the value of the horizontal band flag is 0
The values of the vertical band flag and the horizontal band flag of the video data # 1 and # 2 that have not been subjected to the band limitation are both 1. The selection circuits 182 and 184 select, for example, the video data S14 and the video data # 2 that have been subjected to the band limitation,
Output to the low-pass filter 28.

The low-pass filter 26 (FIGS. 8 and 9)
The video data S14 input from the selection circuit 182 is passed through and output to the thinning circuit 190. The low-pass filter 28 operates in the horizontal mode, filters the video data # 2 input from the selection circuit 184, limits the band, and outputs it to the thinning circuit 192. The thinning circuits 190 and 192 operate in the horizontal mode, respectively, and thin out the chroma signal in the horizontal direction with respect to the line as shown in FIGS.
Output to

The editing processing circuit 194 includes the thinning circuit 19
A predetermined editing process is performed on the video data input from 0,192. The interpolation filter 142 (FIG. 3) operates in the horizontal mode, interpolates the video data of the 4: 1: 1 band input from the editing processing circuit 194, and performs 4: 2:
It generates video data of two bands. The output processing unit 24 multiplexes the input video data and the band flag into an SDI transmission packet and outputs the multiplexed transmission data to the recording device 22.

In the recording device 22, the input processing circuit 22
0 (FIG. 10) is a band flag [FIG. 4 (A), Table 2] from video data # 3 and S18 input from the switching device 18.
Is detected. The selection circuit 222 includes, for example, the video data S
18 is selected and output to the low-pass filter 26.

The low-pass filter 26 includes a selection circuit 222
Video data S1 that has been input from
Pass through 8. The thinning circuit 190 operates in the horizontal mode, and generates video data of the 4: 1: 1 band from video data of the 4: 2: 2 band. The recording unit 228 records the thinned video data.

The editing control unit 12 of the editing system 1
However, for example, by accepting the setting of the editor by a GUI (graphic user interface) and performing setting of each component of the editing system 1, the band flag is not multiplexed with the video data, as shown in the present embodiment. It is possible to realize the operation of the editing system 1 equivalent to the one. Further, the editing control unit 12 determines that each of the video data # 1 to # 3, S14, S1
6, by automatically determining whether or not S18 has passed the band limitation and by setting each component of the editing system 1, the band flag is not multiplexed with the video data, and is shown in the present embodiment. It is possible to realize the operation of the editing system 1 equivalent to the one.

Further, in the above embodiment, the interpolation filter 142 is used to set the video data of the 4: 1: 1 band or 4:
Although it is possible to set the horizontal / vertical mode for performing the processing of the 2: 0 band, depending on the use of the editing system 1, such a setting is not performed, and the interpolation filter 142 sets the video data of the 4: 1: 1 band and 4 : 2: 0 band may be filtered. As described above, when the interpolation filter 142 is configured to filter only one of the video data of the 4: 1: 1 band and the 4: 2: 0 band, the device scale can be reduced, and the cost can be reduced.

Also, for example, when the playback device 14 is 4: 2: 0
The playback device 16 handles 4: 1: 1 video data, and the switching device 18 handles video data S14,
Even in the case where the editing process is performed for S16, the editing process can be collectively performed on these pieces of video data by appropriately setting each component of the switching device 18. The configuration of the editing system 1 shown in the present embodiment is an exemplification, and each component of the editing system 1 can be arbitrarily replaced by means capable of realizing the same function and performance. Irrespective of whether it is implemented or hardware.

[0070]

As described above, according to the video data processing apparatus of the present invention, a plurality of types of video data having different bands can be processed collectively. Further, according to the video data processing device of the present invention, even if the thinning process and the interpolation process are repeatedly performed on a plurality of types of video data having different bands, the quality of the video data is less deteriorated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an editing system according to the present invention.

FIG. 2 is a diagram showing a configuration of a reproducing apparatus shown in FIG.

FIG. 3 is a diagram illustrating a configuration of an interpolation filter illustrated in FIG. 2;

FIGS. 4A to 4D show the relationship between 4: 2: 2 band video data and 4: 2: 0 band video data of the digital sampling interface standard (CCIR601), and 4: 2: FIG. 4 is a diagram illustrating a method of generating video data of 4: 2: 2 band by interpolating video data of 0 band in the vertical direction.

FIGS. 5A to 5E show the relationship between 4: 2: 2 band video data and 4: 1: 1 band video data of the digital sampling interface standard (CCIR601), and 4: 1: FIG. 5 is a diagram illustrating a method of generating video data of 4: 2: 2 band by interpolating video data of one band in the horizontal direction.

FIG. 6 is a diagram illustrating a configuration of an output processing unit illustrated in FIG. 2;

FIGS. 7A and 7B are diagrams showing an operation in which an output processing unit (FIG. 2) adds a band flag to video data.

FIG. 8 is a diagram showing a configuration of a switching device shown in FIG.

FIG. 9 is a diagram showing a configuration of a low-pass filter shown in FIG.

FIG. 10 is a diagram showing a configuration of the recording apparatus shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Editing system, 10 ... Editing desk, 12 ... Editing control part,
14, 16: playback device, 140: playback unit, 142: interpolation filter, 260 _{n to} 260 _{-n + 1} ... delay circuit, 262 _n
262 _-n ... weighting circuit, 264 ... addition circuit, 266
... Switch circuit, 18 switching device, 180 input processing circuit, 182, 184 selection circuit, 26, 28 low-pass filter, 190, 192 thinning circuit, 194 editing processing circuit, 22 recording device, 220 input Processing circuit, 2
22, a selection circuit, 228, a recording unit, 24, an output processing unit,
240 ... horizontal band bit generation circuit, 242 ... vertical band bit generation circuit, 244, 246 ... AND circuit, 248 ...
Switch circuit, 250 interface circuit, 252
... Synchronous signal generation circuit.

Claims (10)

[Claims] 1. A band limiting means for limiting a band of a first video data which is not limited to a predetermined range to generate a second video data, and a second means for indicating that the band is not limited. A video data processing apparatus comprising: a first bandwidth flag added to the first video data; and a second bandwidth flag indicating that the bandwidth has been limited is added to the second video data. 2. The apparatus according to claim 1, wherein said flag adding means stores said first band flag or said second band flag and said first video data or said second video data in a predetermined position of a predetermined transmission packet. 2. The video data processing device according to claim 1, wherein the video data is multiplexed. 3. A video data thinning means for generating a third video data by reducing a band of the video data by thinning a predetermined component of the second video data in a direction perpendicular to a line. The video data processing device according to claim 1. 4. The system according to claim 1, wherein the first video data and the second video data are video data of 4: 2: 2 band of a digital sampling interface standard (CCIR601). The chroma component at the same position of the first video data or the second video data is thinned out every other line in the vertical direction, and the third component of the 4: 2: 0 band is removed.
4. The video data processing device according to claim 3, wherein the video data is generated. 5. A band flag detecting means for detecting a band flag from first video data to which a band flag indicating whether or not a band has been reduced is added, and the detected band flag is used as the first image data. A band for generating the second video data by filtering the first video data only when it indicates that the data bandwidth is not reduced, and limiting the bandwidth of the first video data to a predetermined range; Limiting means; video data thinning means for generating third video data by thinning the first video data or second video data in a direction perpendicular to a line; A video data processing unit for performing predetermined processing on the video data. 6. The first video data and the band flag are multiplexed at predetermined positions of a predetermined transmission packet, respectively, and the band flag detecting means is configured to detect the band flag at a predetermined position of the transmission packet. 6. The video data processing device according to claim 5, wherein 7. A video data interpolator for generating a fourth video data of the same band as the first video data by vertically interpolating the third video data subjected to a predetermined process with respect to a line. 6. The video data processing device according to claim 5, further comprising a unit. 8. The first video data and the second video data are video data of 4: 2: 2 band of a digital sampling interface standard (CCIR601), and the video data thinning means includes: The chroma component of the first video data or the second video data is thinned out every other line in the vertical direction to generate the second video data of the 4: 2: 0 band, and the video data processing means includes: The second of the 4: 2: 0 bands
The predetermined processing is performed on the video data of 4: 2: 0
The video data processing device according to claim 7, wherein the third video data of a band is generated. 9. The video data interpolation means converts each of the thinned-out chroma components of the 4: 2: 0 band of the third video data into a chroma component of the third video data corresponding to an adjacent line. The video data processing apparatus according to claim 8, wherein the fourth video data is generated by interpolating in a vertical direction from the video data. 10. Band detection means for detecting whether or not the band of the first video data has been reduced, and said first video only when it is detected that the bandwidth of said first video data has not been reduced. Band limiting means for filtering data and limiting the band of the first video data to a predetermined range to generate second video data; and converting the first video data or the second video data to a line. A video data processing apparatus, comprising: video data thinning means for generating third video data by thinning the video data in the vertical direction; and video data processing means for performing predetermined processing on the generated third video data.