JP2001231054A - Mlutiplex.demultiplex method for video signal, transmission method and equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can process a signal of a 720p system even by a conventional production system adopting a 480p system by converting the signal of the 720p system into the signal of the 480p system while minimizing deterioration in the image quality. SOLUTION: A luminance component required for the 480p system and horizontal and vertical high frequency components more than the luminance component required for the 480p system are extracted from a luminance component of the 720p system. On the other hand, a color difference component required for the 480p (4:2:0p) system is extracted form a color difference component of the 720p system. Then the horizontal and vertical high frequency components of the extracted luminance component are frequency-converted and the result is multiplexed with the extracted color frequency component to generate the color difference component of the 480p (4:2:2p) system and a video signal of the 480p (4:2:2p) system can be produced from the color difference component and the luminance component required for the 480p system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for multiplexing and demultiplexing video signals, and more particularly to a technique for converting a video signal equivalent to a 720p system into a signal format equivalent to a 480p (4: 2: 2p) system and transmitting the converted signal. .

[0002]

2. Description of the Related Art In recent years, a number of television systems have been proposed along with higher image quality. Among them, the 720p method (horizontal 1280 pixels, vertical 720 pixels, 60 Hz sequential scanning)
And 480p method (720 horizontal pixels, 480 vertical pixels,
The production system of (60 Hz sequential scanning) is more advantageous in terms of price than the production system of the HDTV system or the like, and thus has a potential for spread. Also, the 480p method is 480p
There are a (4: 2: 2p) system and a 480p (4: 2: 0p) system, but the 480p (4: 2: 0p) system is mainly used. However, the 480p (4: 2: 2p) method is another system for the current 4: 2: 2i system.
480p by adding 2: 2i system
There is an advantage that a (4: 2: 2p) system can be realized.

[0003]

The production system of the 720p system is more expensive than the production system of the 480p system. On the other hand, since the signal format is completely different between the 720p system and the 480p system, it is impossible to directly handle the 720p signal in a 480p production system.

Accordingly, an object of the present invention is to solve the above-mentioned problems and convert a 720p signal into a 480p signal while minimizing the deterioration of image quality, thereby providing a conventional 480p system production system. Even 720
It is an object of the present invention to provide a technique capable of handling p-type signals.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for multiplexing / demultiplexing video signals, wherein a luminance component required for the 480p system and a luminance component required for the 480p system are obtained.
Extracting a horizontal high-frequency component and a vertical high-frequency component that are equal to or higher than the luminance component required for the 80p method, and extracting the color difference component required for the 480p (4: 2: 0p) method from the color difference components of the 720p method And the frequency conversion of the extracted horizontal high-frequency component and vertical high-frequency component, and multiplexing with the extracted color difference component, 480p (4: 2: 2p)
And generating a color difference component of the video signal.

[0006] As a separation method, 480p (4: 2:
2p) extracting the components corresponding to the horizontal high-frequency component and the vertical high-frequency component from the color difference components of the system, and performing frequency conversion; and the horizontal high-frequency component and the vertical height of the frequency-converted luminance returned. Adding the area component to the luminance component of the 480p method to generate a luminance component equivalent to 720p.

The extracted horizontal high-frequency component and vertical high-frequency component of the luminance include the bandwidth of the color difference signal in the 480p (4: 2: 2p) system and the color difference signal in the 480p (4: 2: 0p) system. Is preferably equivalent to the difference from the bandwidth.

[0008] It is preferable that identification information indicating multiplexing is embedded in a horizontal high-frequency component and / or a vertical high-frequency component of luminance multiplexed into a luminance signal or a color difference signal.

It is an object of the present invention to provide a method of transmitting a video signal, wherein a luminance component required for the 480p system and a horizontal height higher than or equal to the luminance component required for the 480p system are converted from the luminance component of the 720p system. Extracting the gamut component and the vertical high-frequency component;
(4: 2: 0p) extracting a chrominance component required for the method, and frequency-converting the extracted high-frequency and high-frequency components of the luminance, multiplexing the extracted chrominance components with the extracted chrominance components, and Generating a (4: 2: 2p) color difference component; and extracting the extracted 480p luminance component and the generated 480p (4: 2: 2p) color difference component into a 480p (4: 2p) color difference component. 2: 2p) transmitting the video signal as a video signal.

As a separation method, the transmitted 48
Extracting the components corresponding to the horizontal high-frequency component and the vertical high-frequency component of the luminance from the color difference components of the 0p (4: 2: 2p) method, and performing frequency conversion;
From the color difference components of the (4: 2: 2p) system, components corresponding to the horizontal high-frequency component and the vertical high-frequency component of the luminance are cut, and 48
Returning to the 0p (4: 2: 0p) color difference component, and adding the horizontal and vertical high frequency components of the frequency-converted and returned luminance to the 480p luminance component, and 720
generating a luminance component corresponding to p.

The extracted horizontal high-frequency component and vertical high-frequency component of the luminance are the color difference signal bandwidth in the 480p (4: 2: 2p) system and the color difference signal in the 480p (4: 2: 0p) system. Is preferably equivalent to the difference from the bandwidth.

[0012] Also, identification information indicating that the luminance is multiplexed into the horizontal high-frequency component and / or the vertical high-frequency component of the luminance multiplexed into the luminance signal or the chrominance signal is embedded, and the receiving side performs the above-mentioned processing. It is preferable to distinguish the multiplexed video signal and the non-multiplexed video signal on the receiving side by detecting the identification information.

An object of the present invention is to provide an encoder for a video signal, in which a luminance component of the 720p system is converted into a luminance component required for the 480p system, and a horizontal high frequency range equal to or higher than the luminance component required for the 480p system. First extracting means for extracting a component and a vertical high-frequency component, and second extracting means for extracting a color difference component required for the 480p (4: 2: 0p) method from the color difference component of the 720p method, The extracted horizontal high-frequency component and vertical high-frequency component of the luminance are frequency-converted and multiplexed with the extracted color difference component, and 480p (4: 2: 2p)
Means for generating a color difference component of a video signal.

[0014] The first extracting means is 480p
(4: 2: 2p) color difference signal bandwidth and 48
It is preferable to extract the horizontal high-frequency component and the vertical high-frequency component of the luminance corresponding to the difference from the bandwidth of the color difference signal in the 0p (4: 2: 0p) method.

Further, the encoder embeds identification information indicating that the luminance signal or the chrominance signal is multiplexed in one or more of the horizontal high-frequency component and the vertical high-frequency component of the luminance multiplexed into the chrominance signal. It is preferred to have a means.

An object of the present invention is to provide a decoder for a video signal, which extracts components corresponding to a horizontal high-frequency component and a vertical high-frequency component of luminance from a 480p (4: 2: 2p) color difference component. Extraction means, frequency conversion of the extracted components, and conversion into a horizontal high-frequency component and a vertical high-frequency component having a luminance of 480p (4: 2: 0p) or higher, and a horizontal conversion of the frequency-converted luminance. A video signal decoder characterized by having a generating means for adding a high-frequency component and a vertical high-frequency component to a luminance component of the 480p system to generate a luminance component equivalent to 720p.

[0017] The decoder includes a detecting means for detecting embedded identification information from the luminance signal or the color difference signal;
When the identification information is detected by the detection means, the extraction means performs the extraction processing, and when the identification information is not detected, the extraction means does not perform the extraction processing. Is preferred.

[0018]

Embodiments of the present invention will be described with reference to the drawings. First, a multiplexing method according to the present embodiment will be described. FIG. 1 is a diagram for explaining a multiplexing method according to the present embodiment.

In general, the output of the luminance component of a 720-system video signal is 1280 horizontal pixels and 720 vertical pixels. Here, if the luminance component of the above-described 720p video signal is shown in FIG. 1, a rectangular area surrounded by horizontal 1280 Lpw and vertical 720 Lph is a 720p luminance component. A rectangular area surrounded by 720 Lpw in the horizontal direction and 480 Lph in the vertical direction is a luminance component required by the 480P standard.

By the way, the demand for high resolution in video is only increasing, and it is advantageous to have information of many luminance components in a transmission signal. However, the 720p production system is more expensive than the 480p production system, and the 720p and 480p production systems are expensive.
Since the signal format is completely different from that of the system, it is impossible to directly handle the signal of the 720p system in the production system of the 480p system.

On the other hand, the 480p method uses 480p (4:
The system has shifted from the 2: 2p) system to the 480p (4: 2: 0p) system. However, the 480p (4: 2: 2p) system can be used by preparing two 4: 2: 2i equipment. This is also advantageous in terms of cost. In addition, human eyes have a characteristic that it is difficult to detect an image in which a color component and a high-frequency component of luminance are somewhat lost. For example, FIG.
In, components having high frequencies in both the horizontal and vertical directions (horizontal / vertical high frequency components) have a lower importance than other low frequency components.

Therefore, the 480p (4: 2: 2p) 480p (4: 2p) signal format can be used by making use of the 720p system luminance component and preparing two 4: 2: 2i devices. : 0p) or higher luminance component (7
(Approximately 20p luminance), the following signal processing is performed. (1) In the 720p luminance signal, a luminance component (luminance component of 480p) which is horizontal 720 Lpw or less and vertical 480 Lph or less is cut out. (2) In a 720p luminance signal, a vertical high-frequency component (VH) of 360 Lpw or less in the horizontal direction and 480 Lph or more in the vertical direction.
And a horizontal high-frequency component (HH) of 720 Lpw or more and 1080 Lpw or less and 240 Lph or less in vertical direction. (3) Among the 720p color difference signals, 480p (4: 2: 0)
The corresponding color difference components Cb and Cr of p) (horizontal 360 Lpw or less and vertical 240 Lph or less) are cut out. (4) The frequency of the cut vertical high frequency component (VH) and horizontal high frequency component (HH) is converted, and the frequency-converted vertical high frequency component (VH) and horizontal high frequency component (HH) are converted into a color signal C.
Superimposed on the vertical high frequencies of b and Cr.

The signal generated through such a process (encoding) has a signal format of 480p
(4: 2: 2p) signal format, the practical content is that the luminance component has an amount closer to 720p than the 480p (4: 2: 0p) method, and the image quality is close to the 720p method. Can be obtained. Furthermore, the signal format is 480p
Since the (4: 2: 2p) system is used, it can be used by adding one 4: 2: 2i device to the already installed 4: 2: 2i device. Note that the image signal encoded as described above is decoded by performing the above-described reverse processing.

Next, an apparatus (encoder) for realizing the above-described multiplexing method will be described. FIG. 2 is a block diagram of an encoder that performs the multiplexing method according to the present embodiment.

In FIG. 2, reference numeral 21 denotes a low-pass filter for cutting a component of 720p or more in the 720p luminance signal, and reference numeral 22 denotes a horizontal signal from the output of the low-pass filter 21.
A low-pass filter that cuts components of 80 Lpw or more,
Reference numeral 23 denotes a horizontal 360 Lp from the output of the low-pass filter 22.
a low-pass filter that cuts components equal to or greater than w; 24, a low-pass filter that cuts components equal to or greater than 480 Lph vertically from the output of the low-pass filter 23; 25, an adder that adds the output of the low-pass filter 23 and the output of the low-pass filter 24; Is a vertical frequency converter for shifting the output of the adder 25 to the lower frequency side.

Reference numeral 27 denotes a low-pass filter that cuts components of horizontal 720 Lpw or more from the output of the low-pass filter 22, and reference numeral 28 denotes a low-pass filter that cuts components of vertical 480 Lph or more from the output of the low-pass filter 27.

An adder 29 adds the output of the low-pass filter 22 and the output of the low-pass filter 27.
0 is a low-pass filter that cuts a component of 240 Lph or more from the output of the adder 29, 31 is a horizontal frequency converter that shifts the output of the low-pass filter 30 to the horizontal lower frequency side, and 32 is the output of the horizontal frequency converter 31. Is a vertical frequency conversion unit that shifts.

Reference numeral 33 denotes a low-pass filter which cuts a horizontal 360 Lpw or more component from the 720p color difference signal Cb;
This is a low-pass filter that cuts out components of 0 Lph or more. It is.

Reference numeral 35 denotes a low-pass filter that cuts a component of horizontal 360 Lpw or more from the 720p color difference signal Cr, and reference numeral 36 denotes a vertical 24 from the output of the low-pass filter 35.
This is a low-pass filter that cuts out components of 0 Lph or more.

An adder 37 adds the output of the vertical frequency converter 26 and the output of the low-pass filter 34.
8 is the output of the horizontal frequency converter 31 and the low-pass filter 3
6 is an adder for adding the output of the third embodiment. And 39
The output of the adder 37, the output of the low-pass filter 28,
The multiplexing circuit multiplexes the output of the adder 38 and the output of the low-pass filter 36.

Also, 40, 41, 42, 43 and 44
Is a downconverter for thinning out the scanning lines and horizontal pixels from the 720p signal and downconverting it to a 480p (4: 2: 2p) signal.

In such a configuration, the encoder operates as follows. First, a luminance signal Y of a 720p image signal from a camera or the like is input to the low-pass filter 21. The low-pass filter 21 cuts out components of vertical 720 Lph or more from the input luminance signal.
The output of the low-pass filter 21 is
, And a component of horizontal 1080 Lpw or more is cut. The output of the low-pass filter 22 is output to the low-pass filter 23, the low-pass filter 27, and the adder 29.
Is input to

In the low-pass filter 23, components of the output signal of the low-pass filter 22 that are equal to or more than 360 Lpw are cut off and output to the low-pass filter 24 and the adder 25. In the low-pass filter 24, components of the output signal of the low-pass filter 23 that are equal to or greater than 480 Lph are cut off and output to the adder 25. The output of the low-pass filter 23 (horizontal 36
0 Lpw or less and vertical 720 Lph or less luminance component)
And the output of the low-pass filter 24 (a luminance component of 360 Lpw or less in the horizontal direction and a luminance component of 480 Lph or less in the vertical direction) are subtracted (the output signal of the low-pass filter 23-the output signal of the low-pass filter 24), and the horizontal 0 to 360 Lpw and the vertical 480 to 720 Lph The luminance component, that is, VH in FIG.
Is output from the adder 25. Further, the output signal of the adder 25 is input to the vertical frequency conversion unit 26, and the input horizontal 0-360 Lpw and vertical 480-720 Lph signals are converted into horizontal 0-360 Lp
w, and frequency conversion to a vertical band of 240 to 480 Lph. This frequency conversion is performed by applying 240 Lp to the input signal.
h. Then, the output of the vertical frequency conversion unit 26 is down-converted by the down converter 40 from a signal of the 720p system to a signal of the 480p system.

On the other hand, in the low-pass filter 27, components of the output signal of the low-pass filter 22 that are equal to or more than 720 Lpw are cut off and input to the low-pass filter 28 and the adder 29. In the low-pass filter 28, components of 480 Lph or more in the vertical direction are cut out of the output signal of the low-pass filter 27, and luminance components of horizontal 0 to 720 Lpw and vertical 0 to 480 Lph, that is, luminance components corresponding to Y in FIG. 1 are output. . The output of the low-pass filter 28 is output to the
The signal of the system is down-converted into a signal of the 480p system.

In the adder 29, the output of the low-pass filter 22 (horizontal 0 to 1080 Lpw or less and vertical 0
輝 度 720 Lph or less) and low-pass filter 2
7 (horizontal 0 to 720 Lpw or less and vertical 0 to 7
20Lph or less) (the output signal of the low-pass filter 22-the output signal of the low-pass filter 27), and 720-1080 Lpw in the horizontal direction and 0-72 in the vertical direction.
A luminance component of 0 Lph is output. And the adder 29
Is output by the low-pass filter 30 in the vertical direction of 240 Lp.
h component is cut, horizontal 720-1080 Lpw,
In addition, a luminance component of 0 to 240 Lph in the vertical direction, that is, a signal component corresponding to HH in FIG. 1 is output. Further, the output signal of the low-pass filter 30 is input to the horizontal frequency conversion unit 31, and the input horizontal 720-1080 Lpw and vertical 0-240 Lph luminance components are converted to horizontal 0-360 Lph.
Lpw and frequency conversion to a vertical band of 0 to 240 Lph. This frequency conversion applies 720L to the input signal.
This is performed by applying a carrier of pw. And
The output signal of the horizontal frequency converter 31 is output by the vertical frequency converter 32 from 0 to 360 Lpw horizontally and from 240 to 360 Lpw vertically.
The frequency is converted to a luminance component of 480 Lph. This frequency conversion is performed by applying a carrier of 240 Lph to the input signal. The output of the vertical frequency conversion unit 32 is supplied to the
The signal of the system is down-converted into a signal of the 480p system.

On the other hand, in the color difference signal Cb, components of 360 Lpw or more in the horizontal direction of the signal are cut by the low-pass filter 33, and components of 240 Lph or more in the vertical direction of the signal are cut by the low-pass filter 34. In addition, the color difference signal Cb in the vertical band of 0 to 240 Lph is obtained. Then, the output of the low-pass filter 34 is down-converted by the down converter 43 from a signal of the 720p system to a signal of the 480p system.

In the color difference signal Cr, components of 360 Lpw or more in the horizontal direction are cut off by the low-pass filter 35, and components of 240 Lph or more in the vertical direction are cut off by the low-pass filter 36. Further, it becomes a color difference signal Cr in a band of 0 to 240 Lph in the vertical direction. The output of the low-pass filter 36 is down-converted by the down-converter 44 from a 720p signal to a 480p signal.

The adder 37 performs frequency conversion and down-converted luminance component VH (horizontal 0 to 360 Lp).
w and vertical 240 to 480 Lph) and the output signal (color difference signal Cb) of the low-pass filter 34 are added (multiplexed).
Is done. The adder 38 converts the frequency components of the converted and down-converted luminance components HH (horizontal 0 to 360 Lpw and vertical 240 to 480 Lph) and the low-pass filter 3.
4 (color difference signal Cr) are added (multiplexed). Then, the multiplexing circuit 39 outputs the luminance signal Y, the color difference signal Cb in which the luminance component VH is multiplexed, and the luminance component H
H is multiplexed with the color difference signal Cr in which
A video signal equivalent to the p (4: 2: 2p) system is output.

In the above description, the case where an ideal low-pass filter is used has been described. However, since a steep low-pass filter cannot be realized in practice, it is necessary to take a certain margin for the band to be passed. .

In the present embodiment, the luminance component VH is multiplexed on the chrominance signal Cb and the luminance component HH is multiplexed on the chrominance signal Cr. However, the luminance component VH is multiplexed on the chrominance signal Cr, and the luminance component HH is multiplexed on the chrominance signal Cb. Each may be multiplexed.

Next, a decoder for decoding the video signal multiplexed by the encoder will be described. FIG. 3 is a block diagram of the decoder.

In FIG. 3, reference numeral 51 denotes a vertical 2 of the color difference signals Cb.
A low-pass filter that cuts components of 40 Lph or more,
52, an adder for adding the low-pass filter 51 and the color difference signal Cb; 53, a vertical frequency converter for shifting the output of the adder 52 to the higher vertical side; 55, an adder that adds the low-pass filter 54 and the color difference signal Cr, 56, a vertical frequency converter that shifts the output of the adder 55 to the vertical high frequency side, and 57, an output of the vertical frequency converter 56. A horizontal frequency converter for shifting to the horizontal high frequency side; 58, an adder for adding the output of the vertical frequency converter 53, the horizontal frequency converter 57, and the luminance signal Y;
Reference numerals 0, 61, 62, and 63 denote upconverters for inserting a scanning line and horizontal pixels from a signal of the 480p system and upconverting the signal to a signal of the 720p system.

Next, the operation of the decoder having the above configuration will be described. First, the low-pass filters 51 and 54 convert the input color difference signals Cb and Cr into vertical 240
Cut the components above Lph. The adders 52 and 55 subtract the output signals of the low-pass filters 51 and 54 from the input color difference signals Cb and Cr.

On the other hand, the outputs of the low-pass filters 51 and 54 are up-converted from the signal of the 480p system to the signal of the 720p system by the up-converters 59 and 61, and are converted into the color difference signal Cb and the color difference signal Cr of the 720p system.

In the vertical frequency converter 53, the outputs of the adder 52 (horizontal 0 to 360 Lpw, vertical 240 to 480 Lp
h) is converted to a horizontal 0-360 Lp
w, converted to a vertical band of 480 to 720 Lph, that is, converted to a signal component corresponding to VH in FIG. And
The output of the vertical frequency conversion unit 53 is
Thus, the signal of the 480p system is up-converted into the signal of the 720p system.

In the vertical frequency converter 56, the output of the adder 55 (horizontal 0-360 Lpw, vertical 240-48
0Lph) is vertically frequency-converted to 0-36
0Lpw, vertical 0 to 240 Lph. Further, this signal is converted by the horizontal frequency
The signal is converted into a band of 20 to 1080 Lpw and a vertical of 0 to 240 Lph, that is, converted into a signal component corresponding to HH in FIG. The output of the horizontal frequency converter 57 is converted by the up-converter 62 from the signal of the 480p method into 720
The signal is up-converted into a p-type signal.

In the adder 58, the upconverter 63 up-converts the luminance signal Y (horizontal 0 to 720Lp) from the 480p signal to the 720p signal.
w, vertical 0-480 Lph) and upconverter 60
Output (horizontal 0-360Lpw, vertical 480-720L
ph) and the output of the upconverter 62 (horizontal 720 to 720)
1080 Lpw, vertical 0 to 240 Lph) to obtain a luminance signal equivalent to 720p.

In the above description, the case where an ideal low-pass filter is used has been described. However, since a steep low-pass filter cannot be realized in practice, the band to be passed must be dealt with with some margin. .

In the above embodiment, both the high frequency component in the horizontal direction and the high frequency component in the vertical direction are multiplexed on the color difference signal. However, depending on the situation, either the high frequency component in the horizontal direction or the high frequency component in the vertical direction is used. Only one of them may be multiplexed. In this case, the decoding side may be configured to extract only one of the multiplexed signal components.

Next, a second embodiment will be described. The second embodiment is characterized in that a pilot signal (identification signal) indicating that a luminance component is multiplexed into a color difference signal is inserted.

FIG. 4 is a block diagram of the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 4, 100 and 10
Reference numeral 1 denotes a pilot signal generation circuit that generates a pilot signal indicating that a part of the luminance component is multiplexed with the color difference component. This pilot signal generation circuit 100
And 101, as shown in FIG. 5, sequentially generate contradictory signals, for example, + X and -X signals. Then, the pilot signals generated by the pilot signal generation circuits 100 and 101 are input to adders 37 and 38, and are multiplexed into the color signals Cb and Cr.

The multiplexed pilot signal is inverted in all directions of pixels, lines, and frames, and has the highest frequency in each direction. Therefore, the pilot signal is not conspicuous as an image, and is an optimal method for inserting the pilot signal.

On the other hand, on the decoding side, by detecting the pilot signal, it is possible to determine whether the input video signal is a multiplexed signal, and appropriate processing can be performed.

In the second embodiment, the pilot signal is multiplexed on the color signal Cb and the color signal Cr, but may be multiplexed on the luminance signal Y. In this case, as shown in FIG. 6, an adder 200 for adding a pilot signal is newly provided at the subsequent stage of the low-pass filter 28, and the pilot signal of the pilot signal generation circuit 100 is input to this adder, and the luminance signal Y The pilot signal is multiplexed. Even with this configuration, the same effect as in the above case can be obtained.

[0055]

According to the conversion technique (multiplexing) of the present invention,
It is possible to convert a 720p signal into a 480p signal while minimizing image quality degradation.
As a result, even with a 480p production system, 72
An excellent effect that a 0p signal can be handled is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a multiplexing method according to the present embodiment.

FIG. 2 is a block diagram of an encoder that implements a multiplexing method according to the present embodiment.

FIG. 3 is a block diagram of a decoder that implements a multiplexing method according to the present embodiment.

FIG. 4 is a block diagram according to a second embodiment.

FIG. 5 is a diagram for explaining a pilot signal according to the second embodiment.

FIG. 6 is a diagram for explaining another embodiment of the second embodiment.

[Explanation of symbols]

 21 to 24 Low-pass filter 25 Adder 26 Frequency converter 39 Multiplexer 40 Downconverter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/66 F term (Reference) 5C057 AA01 AA06 BA11 BB01 DA03 EA02 EA07 EA17 EE01 GC01 GJ01 GJ02 GL01 5C063 AA10 AB05 AC01 BA03 CA21 5C066 AA01 AA03 BA08 CA01 CA06 DD01 GA02 GA05 JA01 KC02 KE02 KF06

Claims (17)

[Claims] 1. A method of multiplexing / demultiplexing a video signal, comprising: a luminance component required for a 480p system, a horizontal high frequency component higher than a luminance component required for a 480p system, Extracting a vertical high frequency component; and 480p (4: 2: 0) from the 720p color difference component.
p) a step of extracting a color difference component required for the method; and a frequency conversion of the extracted horizontal high-frequency component and vertical high-frequency component of the luminance, and multiplexing the extracted color difference component with the extracted color difference component.
generating a p (4: 2: 2p) color difference component;
A multiplexing / demultiplexing method for a video signal, comprising: 2. A step of extracting a component corresponding to a horizontal high-frequency component and a vertical high-frequency component of luminance from a 480p (4: 2: 2p) color difference component, and performing frequency conversion; The horizontal high-frequency component and the vertical high-frequency component of the obtained luminance are added to the luminance component of the 480p method,
Generating a luminance component corresponding to 0p. 3. The method according to claim 1, further comprising the steps of: 3. The extracted horizontal high-frequency component and vertical high-frequency component of luminance are a color difference signal bandwidth in a 480p (4: 2: 2p) system and a color difference signal in a 480p (4: 2: 0p) system. 3. The method according to claim 1, wherein the difference corresponds to a difference from the bandwidth of the video signal. 4. 4. The method according to claim 1, wherein identification information indicating that the luminance is multiplexed is embedded in one or both of a horizontal high-frequency component and a vertical high-frequency component of luminance multiplexed on the color difference signal. The method of multiplexing / demultiplexing video signals according to any one of claims 1 to 3. 5. The video signal multiplexing / demultiplexing method according to claim 1, wherein identification information indicating multiplexing is embedded in the luminance signal. 6. A method of transmitting a video signal, comprising: a luminance component required for a 480p system, a horizontal high-frequency component and a vertical height higher than a luminance component required for a 480p system, from a luminance component of a 720p system. Extracting a gamut component; and 480p (4: 2: 0) from the 720p color difference component.
p) a step of extracting a color difference component required for the method; and a frequency conversion of the extracted horizontal high-frequency component and vertical high-frequency component of the luminance, and multiplexing the extracted color difference component with the extracted color difference component.
generating a p (4: 2: 2p) color difference component; 480p converting the extracted 480p luminance component and the generated 480p (4: 2: 2p) color difference component.
Transmitting the video signal as a (4: 2: 2p) system video signal. 7. The transmitted 480p (4: 2: 2)
extracting the components corresponding to the horizontal high-frequency component and the vertical high-frequency component of the luminance from the chrominance components of the p) system and performing frequency conversion; and the transmitted 480p (4: 2: 2p) chrominance components. A component corresponding to the horizontal high-frequency component and the vertical high-frequency component of the luminance, and returning to a 480p (4: 2: 0p) color difference component; and a horizontal height of the luminance converted and returned. The band component and the vertical high band component are added to the luminance component of the 480p system,
7. The method according to claim 6, further comprising: generating a luminance component corresponding to 0p. 8. The extracted horizontal high-frequency component and vertical high-frequency component of luminance are the bandwidth of a chrominance signal in a 480p (4: 2: 2p) system and the color difference signal in a 480p (4: 2: 0p) system. The method according to claim 6 or 7, wherein the difference corresponds to a difference from a bandwidth of the video signal. 9. An identification information indicating that multiplexing is performed is embedded in one or more of a horizontal high-frequency component and a vertical high-frequency component of luminance multiplexed on a color difference signal, and the identification information is encoded on a receiving side. 9. The video signal transmission method according to claim 6, wherein the detection discriminates the multiplexed video signal and the non-multiplexed video signal on the receiving side. 10. An image that is not multiplexed with a video signal multiplexed on the receiving side by embedding identification information indicating that the video signal is multiplexed in a luminance signal and detecting the identification information on the receiving side. 9. The video signal transmission method according to claim 6, wherein the signals are distinguished. 11. An encoder for a video signal, comprising: a luminance component required for the 480p system, a horizontal high-frequency component and a vertical high frequency component higher than the luminance component required for the 480p system, from the luminance component of the 720p system. First extraction means for extracting the component and the 480p (4: 2: 0) from the 720p color difference component.
p) second extracting means for extracting a color difference component required for the method, frequency conversion of the extracted horizontal high-frequency component and vertical high-frequency component, multiplexing with the extracted color difference component, and 480
means for generating a p (4: 2: 2p) color difference component;
An encoder for a video signal, comprising: 12. The method according to claim 12, wherein the first extracting means is 480p
(4: 2: 2p) color difference signal bandwidth and 48
12. The image processing apparatus according to claim 11, wherein the horizontal high-frequency component and the vertical high-frequency component of the luminance corresponding to the difference from the bandwidth of the color difference signal in the 0p (4: 2: 0p) method are extracted. Encoder of the video signal described. 13. A method for embedding identification information indicating that the luminance is multiplexed in one or both of a horizontal high-frequency component and a vertical high-frequency component of luminance multiplexed on a color difference signal. The video signal encoder according to claim 11. 14. The video signal encoder according to claim 11, further comprising means for embedding identification information indicating multiplexing in a luminance signal. 15. A video signal decoder, comprising: extraction means for extracting components corresponding to a horizontal high-frequency component and a vertical high-frequency component of luminance from a 480p (4: 2: 2p) color difference component; The frequency of the extracted component is converted to 480p (4: 2:
0p) a conversion means for converting the luminance into a horizontal high-frequency component and a vertical high-frequency component having a luminance of not less than the method, and adding the horizontal high-frequency component and the vertical high-frequency component of the frequency-converted luminance to the luminance component of the 480p method, Generating means for generating a considerable luminance component. 16. A detection means for detecting identification information embedded in the color difference component, and when the identification information is detected by the detection means, the extraction means performs an extraction process, and the identification information is detected. 16. The video signal decoder according to claim 15, wherein the extraction unit is configured not to perform the extraction process when there is no video signal. 17. A detection means for detecting identification information embedded in the luminance component, and when the identification information is detected by the detection means, the extraction means performs an extraction process to detect the identification information. 16. The video signal decoder according to claim 15, wherein the extraction unit is configured not to perform the extraction process when there is no video signal.