JP3063380B2 - High efficiency coding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (hereinafter abbreviated as VTR) for digitally recording and reproducing a video signal and an audio signal, and a digital signal recording and reproducing apparatus such as a video disk player. The present invention relates to a device that performs motion compensation prediction on a signal and performs compression encoding.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a high-efficiency coding apparatus using unidirectional motion compensation inter-frame prediction. 1 is a digital video input terminal, 2 is a blocking circuit for blocking a digital video input signal, 3 is a subtractor that outputs an error signal of an input block and a prediction block as an error block, and 7 is an encoding based on the determined mode. A first switch circuit 8 for selecting and outputting a block is a discrete cosine transform (hereinafter abbreviated as DCT) which is an orthogonal transform for the encoded block.
DCT circuit which performs, 9 quantization circuit for quantizing the DCT coefficients, the 10 first encoding circuit which performs the coding suitable for a transmission path, 11 is a transmission path.

[0003] 12 is an inverse quantization circuit for inversely quantizing the quantized DCT coefficient, 13 is an inverse DCT circuit for performing inverse DCT on the inversely quantized DCT coefficient, and 14 is an inverse DCT.
An adder for adding a prediction block to a decoded block, which is an output signal of the above, to generate an output block; 15, an image memory for storing an output block for performing motion compensation prediction; and 16, a past video stored in the image memory 15 MC circuit that performs motion detection from the motion compensation search block cut out from the current block and the current input block and performs motion compensation prediction.
A second encoding circuit 19 for encoding the output of the circuit is a second switch circuit for switching the prediction block according to the mode of the discrimination circuit.

Next, the operation will be described. The input digital video signal is m [pixel] × n [line] (m and n are positive integers) by the blocking circuit 2 irrespective of the intra-field where motion compensation prediction is not performed and the prediction field where motion compensation prediction is performed. Is divided into input blocks each of which is a unit and cut out. The difference between the input block and the prediction block is calculated in a pixel unit in the subtracter 3 to obtain an error block. Thus, the input block and the error block are input to the first switch circuit 7, respectively.

[0005] When the first switch circuit 7 processes the screen intra field, the input block is output, the dynamic so that the error block is outputted in the case of predictors
Make. The coding block selected by the first switch circuit 7 is converted into a DCT coefficient by a DCT circuit 8, further subjected to a weighting process and a threshold process by a quantization circuit 9, and a predetermined bit corresponding to each coefficient is obtained. Quantized to a number. The quantized DCT coefficient is converted into a code suitable for the transmission path by the first encoding circuit 10 and output to the transmission path 11.

[0006] The quantized DCT coefficients enter a decoding loop 20 and perform image reproduction for the next motion compensation prediction. The quantized DCT coefficients that have entered the decoding loop 20 are subjected to inverse weighting processing and inverse quantization by the inverse quantization circuit 12, and are further converted by the inverse DCT circuit 13 from DCT coefficients into decoded blocks. The decoded block is added by the adder 14 to the prediction block output from the second switch circuit 19 on a pixel-by-pixel basis, and the image is restored. This prediction block is the same as that used in the subtractor 3. The output of the adder 14 is written at a predetermined position in the image memory 15 as an output block.

The required memory amount of the image memory 15 differs depending on the prediction method. Assuming that the output block is composed of a plurality of field memories, the output block restored by the decoding loop is written to a predetermined position. From the image memory 15 to the MC circuit 16, a block which is a search range of motion detection cut out from a screen reconstructed from a past output block is output.

The size of the search range block for motion detection is i [pixel] × j [line] (i ≧ m, j ≧ n:
i and j are positive integers). The MC circuit 16 receives the search range data from the image memory 15 and the input block from the blocking circuit 2 as reference data, and extracts a motion vector. There are various methods for extracting a motion vector, such as a full search block matching method and a tree search block matching method, which are well-known and will not be described here.

[0009] The motion vector extracted by the MC circuit 16 is converted into a code suitable for the transmission path by the second encoding circuit 18 and output to the transmission path together with the corresponding encoded block. From the MC circuit 16 as a prediction block, a size (m [pixel] ×
n [line]) and output as a block signal. The prediction block output from the MC circuit 16 is generated from past image information. This prediction block is input to the second switch circuit 19. Here, a prediction block is output from one output of the second switch circuit 19 to the subtractor 3 according to the processing field. A prediction block is output from the other output according to the decoding mode at that time.

As a prediction method performed in such a circuit block, for example, a method shown in FIG. 6 can be considered. In this method, an intra field is inserted every four fields, and three intervening fields are used as prediction fields. In FIG. 6, 40 is an intrafield, 41,
Reference numerals 42 and 43 are prediction fields. Prediction in this method is performed from the first field 40 of the intra-field to the second field.
The field 41 is predicted, and similarly, the first field 40 to the third field 42 are predicted. Then, the fourth field 43 is predicted from the reconstructed second field 41.

First, the first field 40 is divided into blocks in the field and subjected to DCT. Furthermore, after performing weighting processing and threshold processing and quantizing, encoding is performed. In the decoding loop, the quantized signal of the first field is decoded / reconstructed. The reconstructed image is used for the motion compensation prediction of the next second field 41 and third field 42. Next, the second field 41 is
After performing motion compensation prediction using the field 40 and subjecting the obtained error block to DCT, encoding is performed in the same manner as in the first field 40. The second field 41 is decoded / reconstructed in a decoding loop according to the mode signal of each block, and is used for motion compensation prediction of the fourth field 43.
On the other hand, similarly to the second field 41, the third field 42 is subjected to motion compensation prediction using the first field 40 and encoded. The fourth field 43 performs motion compensation prediction using the second field 41 reconstructed in the image memory 15,
Encoding is performed in the same manner as in the third field 42.

[0012]

In such a conventional high-efficiency coding apparatus, when the sampling frequency of the luminance signal differs from that of the chrominance signal like a 4: 2: 2 component digital signal, the luminance signal block is Since the area sizes of the color difference signal blocks are different, motion vectors that are originally the same cannot be shared, and it is necessary to obtain a motion vector for each of the luminance signal and the color difference signal. That is, two blocks of the block configuration shown in FIG. 5 are required, and there is a disadvantage that the hardware size becomes large. Further, when the area size of the block of the luminance signal and the block of the chrominance signal is the same, the luminance signal becomes twice as large as the block of the chrominance signal, so that the prediction error of the motion compensation prediction becomes large, and the orthogonal transform accompanying the enlargement of the orthogonal transform block becomes large. The calculation error increases, and the image quality deteriorates.

[0013]

According to a first aspect of the present invention, there is provided a high-efficiency encoding apparatus which divides a digitized video signal into a predetermined size and encodes the divided signal using motion compensation prediction. When the area size of the motion compensation block of the color signal is n times ( where n ≧ 2) the area size of the motion compensation block of the luminance signal, among the motion vectors for n luminance signal blocks corresponding to each color signal block, , the minimum prediction error at each luminance signal block
A motion vector corresponding to the luminance signal block is selected as a motion vector of a color signal, encoding only identification <br/> another signal indicating whether the selected one of the motion vectors of the motion vector of the upper Symbol luminance signal It is configured so that According to a second aspect of the present invention, there is provided a high-efficiency encoding apparatus for dividing a digitized video signal into a predetermined size and encoding using a motion compensation prediction. Is n times the area size of the motion compensation block of the luminance signal ( where n ≧ 2), the motion vector is calculated based on the motion vector among the motion vectors for the n luminance signal blocks corresponding to the color signal blocks.
Order to minimize the prediction error of the color signal block to be
A motion vector corresponding to the serial luminance signal block is selected as a motion vector of a color signal, and configured to encode only the identification signal indicating which selects one of the motion vectors of the motion vector of the upper Symbol luminance signal Things.

[0014]

According to the first aspect of the present invention, the block area size of the chrominance signal is n times the luminance signal (where n ≧ 2).
In motion compensation in the case where the motion the motion vector of the color signal of the motion vectors of the corresponding n number of luminance signals, the corresponding prediction error into a luminance signal block to be minimum vector
Since choosing Le as the motion vector of the color signal, Izu as the motion vector of the color signal among the motion vectors of Brightness signal
Since it is only necessary to encode an identification signal indicating whether or not the selected motion vector has been selected, the amount of generated code can be reduced, and there is no need to perform an operation for obtaining a motion vector for a color signal. According to a second aspect of the present invention, the block area size of the chrominance signal is n
In the motion compensation when the number is twice (where n ≧ 2) ,
The motion vector of the chrominance signal is represented by the corresponding n luminance signal motion vectors.
Among vector, since choosing the prediction error of the color signal obtained on the basis of the motion vector as a motion vector as to minimize, any motion vector of the motion vectors of Brightness signal as a motion vector of a color signal Select
Since only the identification signal shown needs to be encoded, the generated code amount for the color signal is reduced, and the number of operations for obtaining the motion vector of the color signal is also reduced.

[0015]

[Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a digital video input terminal; 51, a block circuit for blocking a luminance signal inputted from the digital video input terminal 1; 57, a luminance signal for storing a reproduced image of the luminance signal as a reference image of the luminance signal Signal memory 55 for performing motion compensation prediction between the block output from the luminance signal blocking circuit 51 and the reference pattern output from the luminance signal image memory 57, and outputting a motion vector and a prediction error. Circuit 52, a switch circuit for switching the output of the luminance signal blocking circuit 51 and the luminance signal motion compensation circuit 55 in the case of the intra mode and the case of the prediction mode, and 53, which is orthogonal to the luminance signal block output from the switch circuit 52 An orthogonal transformation circuit for performing transformation; 54 is a quantization circuit for quantizing the output of the orthogonal transformation circuit 53; Inverse quantization circuit inverse-quantizes the output of the quantization circuit 54, 5
Reference numeral 9 denotes an inverse orthogonal transform circuit that performs an inverse orthogonal transform on the output of the inverse quantization circuit 58.

Reference numeral 60 denotes a chrominance signal blocking circuit for blocking the chrominance signal, 64 denotes a chrominance signal motion vector calculation circuit for obtaining a motion vector of the chrominance signal from the motion vector of the luminance signal output from the luminance signal motion compensation circuit 55, and 66.
Is a color difference signal image memory that stores a reproduced image of the color difference signal as a reference image of the color difference signal, and 65 is a color difference that outputs an error between the output of the color difference signal blocking circuit 60 and the reference pattern output from the color difference signal image memory 66. The signal error calculation circuit 61 includes a chrominance signal blocking circuit 60 and a chrominance signal error calculation circuit 6 for the intra mode and the prediction mode.
5, a switch circuit for switching the output of 5, a reference numeral 62 denotes an orthogonal transform circuit for performing orthogonal transform on the color difference signal block output from the switch circuit 61, a reference numeral 63 denotes a quantization circuit for quantizing the output of the orthogonal transform circuit 62, and a reference numeral 67 An inverse quantization circuit for inversely quantizing the output of the quantization circuit 63;
An orthogonal transform circuit for performing an inverse orthogonal transform on the output of
Is an encoder for performing variable length encoding on the outputs of the luminance signal quantization circuit 54 and the color difference signal quantization circuit 63, and 11 is an encoder 69
Output terminal.

As a prediction method performed in such a circuit block, for example, a method shown in FIG. 6 can be considered. In this method, an intra field is inserted every four fields, and three intervening fields are used as prediction fields. In FIG. 6, 40 is an intrafield, 41,
Reference numerals 42 and 43 are prediction fields. Prediction in this method is performed from the first field 40 of the intra-field to the second field.
The field 41 is predicted, and similarly, the first field 40 to the third field 42 are predicted. Then, the fourth field 43 is predicted from the reconstructed second field 41.

First, the first field 40 is divided into blocks in the field and subjected to DCT. Furthermore, after performing weighting processing and threshold processing and quantizing, encoding is performed. In the decoding loop, the quantized signal of the first field is decoded / reconstructed. The reconstructed image is used for the motion compensation prediction of the next second field 41 and third field 42. Next, the second field 41 is
After performing motion compensation prediction using the field 40 and subjecting the obtained error block to DCT, encoding is performed in the same manner as in the first field 40. The second field 41 is decoded / reconstructed in a decoding loop according to the mode signal of each block, and is used for motion compensation prediction of the fourth field 43.
On the other hand, similarly to the second field 41, the third field 42 is subjected to motion compensation prediction using the first field 40 and encoded. The fourth field 43 performs motion compensation prediction using the second field 41 reconstructed in the image memory 15 ,
Encoding is performed in the same manner as in the third field 42.

Next, the operation will be described. A luminance signal (Y signal) and two color difference signals (RY, BY) are input to the digital video input terminal 1, and a Y signal blocking circuit 51 and a color difference signal (C signal) blocking circuit 6 are provided, respectively.
At 0, a block is formed using, for example, 8 pixels × 8 lines as one unit regardless of the intra-field and the prediction field. In the case of a prediction field, the Y signal motion compensating circuit 55 uses the intra-field reproduced image data stored in the Y signal image memory 57 as a reference image for a motion vector for the input block output from the Y signal blocking circuit 51. Is detected.

Here, the operation of motion vector detection in the Y signal motion compensation circuit 55 will be described. The motion vector is detected by an input block Xi (i, j) (i,
j = 1-8), the motion vector search range is 16
This is performed with a size of pixels × 16 lines. That is, when the input block Xi (i, j) and the position information of the input block in the field are input from the Y signal blocking circuit 51 to the Y signal motion compensation circuit 55, the Y signal motion compensation circuit 55 The position information in the field of the input block is output to 57. Intra-field reproduction image data is stored in the Y signal image memory 57, and reference is made to a motion vector detection range for the input block based on position information in the field of the input block output from the Y signal motion compensation circuit 55. The block is output to the Y signal motion compensation circuit 55. Here, when the input block is Xi (i, j) (i, j = 1 to 8), the detection range of the motion vector is set to 16 pixels × 16 lines.
The signal image memory 57 stores Xr (i +
x, j + y) (x, y = -8 to 7; i, j = 1 to 8) are output.

In the Y signal motion compensation circuit 55, the reference data Xr (i + x, j) output from the Y signal image memory 57
+ Y) to obtain a motion vector by full search. Here, the motion vector detection method is as follows. First, input data Xi (i, j) and reference data Xr (i + x, j +) are searched in a search range of 16 pixels × 16 lines (x, y = −8 to 7).
The prediction error E (x, y) with respect to y) is obtained by the following equation.

[0022]

(Equation 1)

In the search range (x, y = -8 to 7), E
(X0, y0) that minimizes (x, y) is obtained as a motion vector. Further, the Y signal motion compensation circuit 55 calculates the motion vector Mv (x0, y0) and the prediction error Xe in this case.
(I, j) Xe (i, j) = Xi (i, j) -Xr (i + x0, j
+ Y0) is output to the switch circuit 52.

In the switch circuit 52, in the case of the intra mode, the output Xi (i, j) of the Y signal blocking circuit 51
Is selected, and in the case of the prediction mode, the Y signal motion compensation circuit 55
Is selected and output to the orthogonal transformation circuit 53. The orthogonal transform circuit 53 performs, for example, a two-dimensional discrete cosine transform on each of the input 8 × 8 blocks. The quantization circuit 54 quantizes the orthogonal transform coefficients output from the orthogonal transform circuit 53. Here, the quantization circuit 54
In the intra mode, only the orthogonal transform coefficients are output to the encoder 69. In the prediction mode, motion vector information is output to the encoder 69 in addition to the orthogonal transform coefficients. The quantization circuit 54 outputs a signal to the encoder 69 at the head of each field to identify whether this field is in the intra mode or the prediction mode.

The output of the quantization circuit 54 is decoded by an inverse quantization circuit 58 in order to use the reference data in the prediction mode. The inverse orthogonal transform circuit 59 performs a two-dimensional discrete inverse cosine transform on the output of the inverse quantization circuit 58 to restore image data used as reference data. The Y signal image memory 57 stores two fields of the restored image as each block restored by the inverse orthogonal transform circuit 59 as reference data in the prediction mode. Further, it outputs reference image data of the detection range of the motion vector to the Y signal motion compensation circuit 55.

Next, a method of detecting a motion vector of a color difference signal will be described. Originally, when the video signal has motion, since the luminance signal and the color difference signal move simultaneously, when the sampling frequency of the luminance signal and the color difference signal is the same, the motion vector of the color difference signal becomes the same as the motion vector for the luminance signal. Should be. However, in the case of the 4: 2: 2 component digital signal, the sampling frequency of the two color difference signals RY and BY is equal to the sampling frequency of the luminance signal.
1/2. For this reason, as shown in FIG.
When the blocking of 8 pixels × 8 lines is performed on the Y signal, each area size is twice as large as that of the Y signal. It can be seen that the blocks correspond.
However, the motion vector for the C signal block has a strong correlation with the motion vector for the corresponding two Y signal blocks. Therefore, even if one of the motion vectors for these two Y signals is used as the motion vector of the C signal to perform motion compensation prediction, it can be said that the prediction error of the C signal is sufficiently small. Also, of the two Y signal motion vectors corresponding to the C signal block, one having a smaller prediction error for the Y signal block is considered to be more appropriate as the motion vector for the C signal block. Therefore, in the present invention, of the two motion vectors for the Y signal obtained by the Y signal motion compensation circuit 55, the one with the smaller prediction error for the Y signal block is selected as the C signal motion vector.

The motion vector for the C signal is calculated by the C signal motion vector calculation circuit 64. Hereinafter, the operation of the C signal motion vector calculation circuit 64 will be described.
In the Y signal motion compensation circuit 55, the Y signal motion vector component Mv (x0, y0) and the Y signal
1 is the sum of the absolute values Er of the error components between the output Di (i, j) of the No. 1 and the reference block Dr (i + x0, j + y0) indicated by the motion vector of the Y signal.

[0028]

(Equation 2)

The sum Er of the absolute value of the error component is expressed by C
The signal is output to the signal motion vector calculation circuit 64. Where C
In the signal motion vector calculation circuit 64, RY,
Of the motion vectors of the two Y signals corresponding to the block of the BY signal, the sum of the absolute values of the prediction errors is compared, and the smaller motion vector is set as the motion vector of the C signal. That is, the motion vectors of the Y signal corresponding to the blocks of each C signal are Mv1 and Mv2, and the absolute value sums Er1 and E2 of the error components thereof.
Assuming that r2, if Er1> Er2, Mv1 is set to Er1
If ≦ Er2, Mv2 is selected as the motion vector of the entire block of the C signal.

The C signal error calculating circuit 65 predicts the reference block output from the C signal image memory 66 and the block output from the C signal blocking circuit 60 according to the motion vector obtained by the C signal motion vector calculating circuit 64. An error is obtained and output to the switch circuit 61 together with the motion vector. Here, the motion vector of the C signal is Y
Since either one of the two motion vectors Mv1 and Mv2 for the signal is used, Mv1 or Mv
Only a control signal indicating which motion vector of v2 is selected is output as a motion vector. The operations of the switch circuit 61, the orthogonal transformation circuit 62, and the quantization circuit 63 for the C signal, and the operations of the inverse quantization circuit 67 and the inverse orthogonal transformation circuit 68 are the same as those for the Y signal, and thus will not be described.

Next, the output of the quantization circuit 54 for the Y signal and the output of the quantization circuit 63 for the C signal are encoded by an encoder 69.
Is input to The encoder 69 performs variable length coding on the data of the Y and C signals and outputs the data to the transmission line 11.

In the above embodiment, the motion vector of the C signal is selected as the motion vector of the C signal from the motion vectors of the two Y signals, in which the prediction error in each Y signal block is smaller. , The respective prediction errors may be calculated using the motion vectors of the two Y signals, and the smaller prediction error may be used as the motion vector of the C signal. Alternatively, the average of two motion vectors for Y may be selected as the motion vector of the C signal. However, in this case, the motion vector of the C signal in the decoding system is Y
Since it can be synthesized from the motion vector of the signal, the motion vector information for the C signal need not be transmitted.

In the above embodiment, the sampling frequency of the two chrominance signals of the input signal is 1/2 times that of the luminance signal. However, the sampling frequency is not necessarily 1/2 times, and the sampling frequency is 1 / n times. May be performed. For example, when the color difference signal is 1/4 times the luminance signal, one color difference signal block corresponds to four luminance signal blocks as shown in FIG.
For this reason, the C signal motion vector calculation circuit 64 selects an optimal one of the four Y signal motion vectors corresponding to each C signal as the C signal motion vector.

In the above embodiment, the C signal is not line-sequential, but the C signal may be line-sequentially arranged at an arbitrary interval. For example, when line-sequentially is performed for every two lines on a color difference signal, four luminance signal blocks correspond to one color difference signal block as shown in FIG. Therefore, the C signal motion vector calculation circuit 64 may select the optimum one of the four Y signal motion vectors corresponding to each C signal as the C signal motion vector.

In the above embodiment, the block size of the orthogonal transform is set to 8 pixels × 8 lines. However, the block size is not necessarily 8 pixels × 8 lines, and the block size is set to n pixels × m lines. Is also good. Similarly, the detection range of the motion vector need not be 16 pixels × 16 lines, but may be k pixels × l lines (k ≧ n, l ≧ m). In addition, although predictive encoding is completed every four fields, it is not always necessary to use four fields, and predictive encoding may be completed every arbitrary field.

[0036]

According to the first aspect of the present invention, the motion vector of the color signal minimizes the prediction error among the motion vectors for the corresponding n (where n ≧ 2) luminance signals .
Since choosing a motion vector corresponding to the luminance signal as a motion vector of a color signal, selecting one of the motion vectors of the motion vector of Brightness signal as a motion vector of a color signal
Since it is only necessary to encode an identification signal indicating whether or not the color signal has been generated, it is possible to reduce the amount of generated code, and it is not necessary to perform an operation for obtaining a motion vector for the color signal.
There is an effect that a high-efficiency encoding device with a small hardware scale can be realized. According to claim 2 of the present invention, the number of motion vectors of the color signal is n (where n
≧ 2) of the motion vectors of the luminance signal ,
A prediction error of the color signal obtained based on Le chosen as a motion vector that a minimum, any motion base of the motion vector of Brightness signal as a motion vector of a color signal
Since it is only necessary to encode the identification signal indicating whether the vector has been selected, the amount of generated codes for the color signal is reduced, the number of operations for obtaining the motion vector of the color signal is also reduced, and a high-efficiency code with a small hardware scale is used. There is an effect that the conversion device can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing block sizes of a luminance signal and a color difference signal in the first embodiment of the present invention.

FIG. 3 is a diagram showing block sizes of a luminance signal and a color difference signal in another embodiment of the present invention.

FIG. 4 is a diagram showing block sizes of a luminance signal and a color difference signal in another embodiment of the present invention.

FIG. 5 is an explanatory diagram of motion compensation prediction in a conventional encoding device.

FIG. 6 is an explanatory diagram of motion compensation prediction.

[Explanation of symbols]

 Reference Signs List 1 digital image input terminal 11 transmission line 51 luminance signal blocking circuit 52 luminance signal switch circuit 53 luminance signal orthogonal transformation circuit 54 luminance signal quantization circuit 55 luminance signal motion compensation circuit 57 luminance signal image memory 58 luminance signal inverse quantization Circuit 59 Luminance signal inverse orthogonal transformation circuit 60 Color difference signal blocking circuit 61 Color difference signal switch circuit 62 Color difference signal orthogonal transformation circuit 63 Color difference signal quantization circuit 64 Color difference signal motion vector calculation circuit 65 Color difference signal error calculation circuit 66 Image for color difference signal Memory 67 Color difference signal inverse quantization circuit 68 Color difference signal inverse orthogonal transform circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-241289 (JP, A) JP-A-58-27489 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 11/00-11/24 H03M 7/30 H04N 7/24-7/68 H04N 9/79-9/898

Claims (2)

(57) [Claims] 1. An apparatus for dividing a digitized video signal into a predetermined size and coding using motion compensation prediction, wherein an area size of a motion compensation block of a chrominance signal is equal to an area of a motion compensation block of a luminance signal. N times the size ( where n ≧
If it is 2), among the motion vectors for n luminance signal blocks corresponding to each color signal block, the luminance signal blanking to minimum prediction error at each luminance signal block
A motion vector corresponding to the locked selected as the motion vector of the color signal, the inner of the motion vector of the upper Symbol luminance signal noise
A high-efficiency encoding device encoding only an identification signal indicating whether the selected motion vector has been selected . 2. An apparatus for dividing a digitized video signal into a predetermined size and encoding using a motion compensation prediction, wherein an area size of a motion compensation block of a chrominance signal is equal to an area of a motion compensation block of a luminance signal. N times the size ( where n ≧
If it is 2), among the motion vectors for n luminance signal blocks corresponding to the color signal block, the motion vector
Motion corresponding to the luminance signal block that minimizes the prediction error in the color signal block obtained based on the
Select vector as the motion vector of a color signal, one of the motion vectors of the motion vector of the upper Symbol luminance signal selection
A high-efficiency encoding apparatus that encodes only an identification signal indicating whether or not the selection has been made.