TW201345269A - Image encoder, image coding method, image coding program, transmitter, transmission method, and transmission program, and image decoder, image decoding method, image decoding program, receiver, reception method, and reception program - Google Patents

Abstract

A quantization parameter determination unit (102) sets the quantization parameters of a block. An orthogonal transform and quantization unit (108) quantizes the image signal of a block based on quantization parameters, compresses, and codes the image signal. A PCM coding unit (104) codes the uncompressed block image signal. A deblocking filter (111) uses the quantization parameter values set for each of the blocks on both sides of a block boundary to calculate the filtering strength, and applies a filtering process to the blocks on both sides of the block boundary. The deblocking filter (111) outputs the input signal before filtering without any modification as the output signal if the block is a coded uncompressed block.

Description

Image coding device, image coding method, image coding program, transmission device, transmission method, and transmission program, and image decoding device, image decoding method, image decoding program, receiving device, receiving method, and receiving program

The present invention relates to video encoding and decoding techniques, and more particularly to image encoding and decoding techniques that utilize filtering.

Representatives of the compression coding method for moving pictures include MPEG-2 video, MPEG-4 video, and MPEG-4 AVC/H.264. Among these specifications, an image is divided into a plurality of rectangular blocks and encoded/decoded in block units. Since intra-picture prediction, inter-picture prediction, orthogonal conversion, and quantization are performed in block units, encoding is performed at the boundary of the block. This distortion is called block distortion. The block distortion is a pattern that is interposed between the upper and lower sides of the block boundary or between the two blocks on the left and right sides, the image referred to between the inter-picture predictions, and the inter-picture prediction. Occurs due to differences in motion vectors, quantization parameters, and the like. The process of removing or reducing the block distortion for the decoded image is called deblocking filtering.

[Previous Technical Literature] [Non-patent literature]

[Non-Patent Document 1] ISO/IEC 14496-10 Information technology--Coding of audio-visual objects--Part 10: Advanced Video Coding

In order to reduce the block distortion caused by quantization, the intensity of the deblocking filter must be appropriately set with the quantization parameter.

The present invention has been developed in view of such a situation, and an object thereof is to provide an image coding technique capable of appropriately setting the intensity (filtering strength) of deblocking filtering in order to reduce block distortion and an image decoding technique corresponding thereto .

In order to solve the above problems, a video encoding apparatus according to an aspect of the present invention is a video encoding apparatus for encoding a video signal including a luminance signal and a color difference signal in a block unit, and includes: a quantization parameter determining unit (102) And setting a quantization parameter of the block; and the first coding unit (108) quantizes, compresses, and encodes the video signal of the block based on the pre-quantization parameter; and the second coding unit (104), The image signal of the block is uncompressed and encoded; and the deblocking filter unit (111) uses the quantization parameter values set by the blocks on both sides of the block boundary to derive the filter strength. The blocks on both sides of the boundary of the preceding block are subjected to filtering processing. The pre-recorded block filter unit (111) is based on the pre-record On the block that is not compression-coded, the input signal before the pre-filtering process is implemented as an output signal.

Another aspect of the invention is also an image encoding device. The device is a video encoding device that encodes an image signal including a luminance signal and a color difference signal in a block unit, and includes: a quantization parameter determining unit (102) that sets a quantization parameter of the block; and the first The encoding unit (108) quantizes, compresses, and encodes the video signal of the block based on the pre-quantified quantization parameter; and the second encoding unit (104) performs non-compression encoding on the video signal of the block; The block filter unit (111) determines the filter strength by using the quantization parameter values set by the blocks on both sides of the block boundary, and performs filtering processing on the blocks on both sides of the boundary of the preceding block. The pre-blocking filter unit (111) is a block that performs non-compression coding if the pre-block is a block, and the input signal before filtering is directly used as an output signal.

Another aspect of the present invention is an image encoding method. The method is a video encoding method for encoding an image signal containing a luminance signal and a color difference signal in a block unit, comprising: a quantization parameter determining step of setting a quantization parameter of the block; and a first encoding step, The image signal of the block is quantized, compressed and encoded based on the pre-quantified quantization parameter; and the second encoding step is to perform non-compression coding on the image signal of the block; and the deblocking filtering step is to use the block The quantization parameter values set by the blocks on both sides of the boundary are used to derive the filter strength, and the blocks on both sides of the boundary of the preceding block are subjected to filtering processing. The pre-blocking filtering step is performed on the block that was previously uncompressed and encoded. The input signal before the filtering process is directly used as the output signal.

Still another aspect of the present invention is also an image encoding method. The method is a video encoding method for encoding an image signal containing a luminance signal and a color difference signal in a block unit, comprising: a quantization parameter determining step of setting a quantization parameter of the block; and a first encoding step, The image signal of the block is quantized, compressed and encoded based on the pre-quantified quantization parameter; and the second encoding step is to perform non-compression coding on the image signal of the block; and the deblocking filtering step is to use the block The quantization parameter values set by the blocks on both sides of the boundary determine the filtering strength, and the filtering processing is performed on the blocks on both sides of the boundary of the preceding block. The pre-blocking filtering step is that if the pre-block is a block that is not compression-coded, the input signal before filtering is directly used as an output signal.

Another aspect of the invention is a signal transmitting device. The apparatus includes a packet processing unit that encapsulates a coded bitstream to obtain a coded stream, the coded bitstream is an image in which a video signal including a luminance signal and a color difference signal is encoded in a block unit. The encoding method is encoded; and the transmitting unit transmits the encoded stream before being packetized. The pre-image encoding method includes: a quantization parameter determining step of setting a quantization parameter of the block; and a first encoding step of quantizing, compressing, and encoding the image signal of the block based on the pre-quantified parameter; The second encoding step is to perform uncompressed encoding on the image signal of the block; and the deblocking filtering step is to use the quantization parameter values set by the blocks on both sides of the block boundary to derive the filtering strength. Filtering is performed on the blocks on both sides of the boundary of the preceding block. Pre-blocking filter The wave step is performed on the block which is previously uncompressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal.

Another aspect of the present invention is a method of transmitting. The method includes: a packet processing step of packetizing a coded bit column to obtain a coded stream, wherein the coded bit string is an image obtained by encoding a video signal including a luminance signal and a color difference signal in a block unit. The encoding method is encoded; and the sending step is to encode the stream before being packetized and send it. The pre-image encoding method includes: a quantization parameter determining step of setting a quantization parameter of the block; and a first encoding step of quantizing, compressing, and encoding the image signal of the block based on the pre-quantified parameter; The second encoding step is to perform uncompressed encoding on the image signal of the block; and the deblocking filtering step is to use the quantization parameter values set by the blocks on both sides of the block boundary to derive the filtering strength. Filtering is performed on the blocks on both sides of the boundary of the preceding block. The pre-blocking filtering step is performed on the block which is previously uncompressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal.

A video decoding apparatus for decoding a video signal including a luminance signal and a color difference signal in a block unit includes a quantization parameter deriving unit (205), which is a block. And the first decoding unit (209) performs inverse quantization and decoding on the video signal of the block that has been compression-coded based on the pre-determined quantization parameter; and the second decoding unit (207) The image signal of the block that has been uncompressed coded is decoded; and the deblocking filter unit (211) is used to set the amount of each block on both sides of the block boundary. The parameter values are used to derive the filter strength, and the decoded image signals of the blocks on both sides of the pre-block boundary are subjected to filtering processing. The pre-blocking block filter unit (211) directly converts the input signal before the pre-filtering process into the output signal on the pre-recorded video signal of the block which is uncompressed.

Another aspect of the present invention is also a video decoding device. The device is a video decoding device for decoding an image signal including a luminance signal and a color difference signal in a block unit, and includes: a quantization parameter deriving unit (205) for deriving the quantization parameter of the block; and the first The decoding unit (209) performs inverse quantization and decoding on the video signal of the block that has been compression-coded based on the pre-quantization parameter; and the second decoding unit (207) is a block that has been non-compressed. The image signal is decoded; and the deblocking filter unit (221) determines the filter strength by using the quantization parameter values set by the blocks on both sides of the block boundary, and the two sides of the boundary of the preceding block are determined. The decoded video signal of the block is subjected to filtering processing. The pre-blocking filter unit (221) is used to directly convert the input signal before filtering into an output signal if the pre-block is a block that is subjected to non-compression coding.

Another aspect of the present invention is a video decoding method. The method is a video decoding method for decoding an image signal containing a luminance signal and a color difference signal in a block unit, comprising: a quantization parameter deriving step of deriving a quantization parameter of the block; and a first decoding step, The image signal of the block that has been compression-coded is inverse quantized and decoded based on the pre-quantified quantization parameter; and the second decoding step is to decode the image signal of the block that has been uncompressed, and de-algorithm Block filtering step The filtering intensity is derived by using the quantization parameter values set by the blocks on both sides of the block boundary, and the decoded image signals of the blocks on both sides of the pre-block boundary are subjected to filtering processing. The pre-blocking filtering step is performed on the pre-recorded decoded video signal of the block which is not compressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal.

Still another aspect of the present invention is also a video decoding method. The method is a video decoding method for decoding an image signal containing a luminance signal and a color difference signal in a block unit, comprising: a quantization parameter deriving step of deriving a quantization parameter of the block; and a first decoding step, The image signal of the block that has been compression-coded is inverse quantized and decoded based on the pre-quantified quantization parameter; and the second decoding step is to decode the image signal of the block that has been uncompressed, and de-algorithm The block filtering step determines the filtering strength by using the quantization parameter values set by the blocks on both sides of the block boundary, and performs filtering processing on the decoded image signals of the blocks on both sides of the pre-block boundary. The pre-blocking filtering step is to treat the input signal before filtering as an output signal if the pre-block is a block that has been non-compressed.

Another aspect of the invention is a receiving device. The device belongs to a receiving device that receives and decodes a coded bit sequence encoded by an image, and includes a receiving unit that receives a coded stream, and the encoded stream is a brightness signal. And the image signal of the color difference signal is encapsulated by the coded bit column encoded by the block unit; and the restoring unit encapsulates the received pre-coded stream to recover the original Encoded bit column; and quantization parameter derivation unit (205), the quantization parameter of the block is derived; and the first decoding unit (209) records the video signal of the block that has been compression-coded from the original coded bit sequence before being restored. Performing inverse quantization and decoding based on the pre-quantization parameter; and the second decoding unit (207) decodes the video signal of the block that has been non-compressed encoded from the original encoded bit sequence before being restored; The block filter unit (211) uses the quantization parameter values set by the blocks on both sides of the block boundary to derive the filter strength, and the decoded image signals of the blocks on both sides of the boundary of the preceding block boundary. Perform filtering processing. The pre-blocking block filter unit (211) directly converts the input signal before the pre-filtering process into the output signal on the pre-recorded video signal of the block which is uncompressed.

Another aspect of the present invention is a receiving method. The method belongs to a receiving method for receiving and decoding a coded bit sequence encoded by an image, which comprises: a receiving step of receiving a coded stream, wherein the encoded stream is a brightness signal And the image signal of the color difference signal is encapsulated by the coded bit column encoded by the block unit; and the restoration step is to packetize the received pre-coded stream to recover the original a coding bit column; and a quantization parameter derivation step of deriving the quantization parameter of the block; and a first decoding step of recording the originally coded bit column from the original encoded bit column before being restored The image signal of the block is inversely quantized and decoded based on the pre-quantitative parameter; and the second decoding step is to decode the original image bit sequence from the original bit before decoding, and decode the image signal of the block that has been non-compressed. And the deblocking filtering step, the blocks on both sides of the block boundary are respectively set. The parameter values are quantized to derive the filter strength, and the decoded image signals of the blocks on both sides of the pre-block boundary are subjected to filtering processing. The pre-blocking filtering step is performed on the pre-recorded decoded video signal of the block which is not compressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal.

Further, even if any combination of the above constituent elements and the expression of the present invention are converted between a method, an apparatus, a system, a recording medium, a computer program, etc., it is effective for the aspect of the present invention.

According to the present invention, the filter strength can be appropriately set to reduce block distortion.

101‧‧‧Image memory

102‧‧‧Quantity Parameter Determination Department

103‧‧‧Intra-frame prediction department

104‧‧‧PCM coding department

105‧‧‧Inter-picture prediction department

106‧‧‧Code Method Determination Department

107‧‧‧Residual Signal Generation Department

108‧‧‧Orthogonal Conversion ‧Quantity Department

109‧‧‧ inverse quantization ‧ inverse orthogonal transformation

110‧‧‧Decoded image signal overlap

111‧‧‧Deblocking Filter Section

112‧‧‧ Coded information storage memory

113‧‧‧1st decoded image memory

114‧‧‧2nd decoded image memory

115‧‧‧1st coded bit column generation unit

116‧‧‧2nd coded bit column generation unit

117‧‧‧3rd coded bit column generation unit

118‧‧‧Coded bit column

119‧‧‧ switch

201‧‧‧Coded bit column separation

202‧‧‧1st coded bit column decoding unit

203‧‧‧2nd coded bit column decoding unit

204‧‧‧3rd coded bit column decoding unit

205‧‧‧Quantity Parameter Derivation Department

206‧‧‧Intra-frame prediction department

207‧‧‧PCM decoding department

208‧‧‧Inter-picture prediction department

209‧‧‧ inverse quantization ‧ inverse orthogonal transformation

210‧‧‧Decoded image signal overlap

211‧‧‧Deblocking Filter Division

212‧‧‧ Coded information storage memory

213‧‧‧1st decoded image memory

214‧‧‧2nd decoded image memory

215‧‧‧ switch

216‧‧‧ switch

Fig. 1 is a block diagram showing the configuration of a video encoding apparatus according to an embodiment.

Fig. 2 is a block diagram showing the configuration of a video decoding device according to an embodiment.

Fig. 3 is an explanatory diagram of a tree block and a coding block defined in the present embodiment.

Fig. 4 is an explanatory diagram of a division mode defined in the present embodiment.

[Fig. 5] An explanatory diagram of an example of quantizing a group block.

[Fig. 6] A flowchart for explaining the determination of the quantization parameter and the description of the encoding processing procedure.

[Figure 7] Decoding of quantization parameters. The flow chart is used to describe the export handler.

8] The amount in step S1109 of FIG. 6 and step S1206 of FIG. A flow chart is used to explain the procedure for deriving the predicted value of the parameter.

[Fig. 9] An explanatory diagram of an example of a pixel at a block boundary.

FIG. 10 is a flowchart for explaining a procedure of processing performed by the deblocking filter unit 111 of the video encoding device and the deblocking filter unit 211 of the video decoding device.

[Fig. 11] A flowchart for explaining the deblocking filter processing procedure for each coding block.

[Fig. 12] An explanatory diagram of an example of a vertical boundary and a horizontal boundary of a conversion block in a coding block.

[Fig. 13] An explanatory diagram of an example of a vertical boundary and a horizontal boundary of a prediction block in a coding block.

FIG. 14 is a flowchart of a filter processing procedure of the signal of step S2204 of FIG.

Fig. 15 is a flowchart showing a filter processing procedure of the block edge in step S2302 of Fig. 14 of the first embodiment.

FIG. 16 is an explanatory diagram of a table in which an index indexB and a variable β are associated with each other.

FIG. 17 is an explanatory diagram of a table in which an index indexTc is associated with a variable tc.

Fig. 18 is a flowchart showing a procedure of filtering processing of signals of each line in step S3114 of Fig. 15 of the first embodiment.

Fig. 19 is a flowchart showing a filter processing procedure of the block edge in step S2302 of Fig. 14 of the second embodiment and the third embodiment.

20] Each line in step S3114 of FIG. 19 of the second embodiment Flowchart of the program for filtering the signal.

Fig. 21 is a flowchart showing a procedure of filtering processing of signals of each line in step S3114 of Fig. 19 of the third embodiment.

In the present embodiment, the encoding of the moving image is performed, in particular, by dividing the image into blocks of a rectangle of an arbitrary size and shape, and performing intra-frame prediction, inter-frame prediction, orthogonal conversion, and quantization, which will be described later. And coding.

First, the technique and technical terms used in the present embodiment are defined.

(about tree block, coding block)

In the embodiment, as shown in FIG. 3, the image is equally divided into rectangular units of any square of the same size. This unit is defined as a tree block, which is used to encode/decode the target block in the image (the encoding process block is the encoding target block and the decoding process is the decoding target block. Unless otherwise stated) This is the basic unit of address management that is specifically required. A tree block other than monochrome is composed of one luminance signal and two color difference signals. The size of the tree block corresponds to the size of the image or the texture within the image, and can be freely set to the size of the power of two. In order to optimize the encoding process, the tree block system can change the brightness signal and the color difference signal in the tree block back to the ground (2 divisions in the vertical and horizontal directions) according to the texture in the image. Small size blocks. Define this block as The coding block is the basic unit of processing at the time of encoding and decoding. The coding block except for monochrome is also composed of one luminance signal and two color difference signals. The maximum size of the coding block is the same as the size of the tree block. The coding block of the smallest size of the coding block is called the minimum coding block and can be freely set to the size of the power of 2.

In FIG. 3, the coding block A does not divide the tree block and treats it as one coding block. The coding block B is a coding block in which the tree block is divided into four. The coding block C is a coding block in which a block in which the tree block is divided into four is further divided into four. The coding block D is a coding block in which a block in which a tree block is divided into four and is divided into four and is divided into four, and is a coding block of a minimum size.

In the description of the embodiment, the size of the tree block is set to a luminance signal of 64×64 pixels and a color difference signal of 32×32 pixels in a manner that the color difference format is 4:2:0, and the minimum coding block is The size is set to 8×8 pixels for the luminance signal and 4×4 pixels for the color difference signal. In FIG. 3, the size of the coding block A is 64×64 pixels for the luminance signal and 32×32 pixels for the color difference signal, and the size of the coding block B is 32×32 pixels for the luminance signal and 16× for the color difference signal. 16 pixels, the size of the coding block C is 16×16 pixels, the color difference signal is 8×8 pixels, and the size of the coding block D is 8×8 pixels for the luminance signal and 4×4 pixels for the color difference signal. . In addition, when the color difference format is 4:4:4, the luminance signal of each coding block is equal to the size of the color difference signal. When the color difference format is 4:2:2, the size of the coding block A is 32×64 pixels in the color difference signal, and the size of the coding block B is 16×32 pixels in the color difference signal, and the coding block C is The size is 8 × 16 pixels, and the smallest coding block, that is, the size of the coding block D is 4 × 8 pixels.

(about prediction mode)

In the coding block unit, switching to not use the encoded/decoded (in the encoding process, the image, the prediction block, the video signal, etc., which are used to decode the encoded signal, are used in the decoding process. In-picture mode (MODE_INTRA) in which an image to be decoded is encoded in an encoding/decoding target image, and an image to be decoded, a prediction block, an image signal, and the like, which will be used in the following sense unless otherwise specified An inter-picture mode (MODE_INTER) for performing inter-picture prediction by referring to the decoded video signal of the encoded/decoded picture. The mode for identifying the intra mode (MODE_INTRA) and the inter mode (MODE_INTER) is defined as a prediction mode (PredMode). The prediction mode (PredMode) has the value of the intra mode (MODE_INTRA) or the inter mode (MODE_INTER), and can be selected and encoded.

(About split mode, prediction block, prediction unit)

When intra-picture prediction and inter-picture prediction are performed by dividing an intra-picture into blocks, in order to make the switching unit of the intra-picture prediction and the inter-picture prediction method smaller, the coding block is divided and predicted as necessary. A mode for identifying a segmentation method of the luminance signal and the color difference signal of the coding block is defined as a split mode (PartMode). Then, the divided block is also defined as a prediction block as needed. As shown in Figure 4, with The division method of the luminance signal of the coding block defines eight division modes (PartMode).

The division mode (PartMode) in which the luminance signal of the coding block is not divided as shown in FIG. 4(a) is regarded as 2N×2N division (PART_2Nx2N). 4(b), (c), and (d), the division mode (PartMode) of the two prediction blocks that are not divided into upper and lower side by the luminance signal of the coding block is defined as 2N×N division (PART_2NxN). ), 2N × nU segmentation (PART_2NxnU), 2N × nD segmentation (PART_2NxnD). However, the 2N×N segmentation (PART_2NxN) is a segmentation mode in which the upper and lower divisions are divided by a ratio of 1:1, and the 2N×nU segmentation (PART_2NxnU) is a segmentation mode in which the upper and lower divisions are divided by a ratio of 1:3, 2N×nD segmentation. (PART_2NxnD) is a split mode in which the upper and lower divisions are divided by a ratio of 3:1. 4(e), (f), and (g) show that the luminance signal of the coding block is not divided into two partitioning modes (PartMode) of the two prediction blocks, which are defined as N×2N partitions (PART_Nx2N). ), nL × 2N division (PART_nLx2N), nR × 2N division (PART_nRx2N). However, the N×2N segmentation (PART_Nx2N) is a segmentation mode in which the left and right are divided by a ratio of 1:1, and the nL×2N segmentation (PART_nLx2N) is a segmentation mode in which the ratio is divided by a ratio of 1:3, nR×2N segmentation. (PART_nRx2N) is a split mode in which the ratio is divided by a ratio of 3:1. The luminance signal of the coding block shown in FIG. 4(h) is divided into four upper and lower divisions, and the division mode (PartMode) which becomes four prediction blocks is defined as N×N division (PART_NxN).

In addition, each split mode (PartMode) is respectively bright and bright The vertical and horizontal division ratio of the signal is equally divided into the color difference signals.

When the prediction mode (PredMode) is the inter mode mode (MODE_INTER), the partition mode (PartMode) defines 2N×2N segmentation (PART_2Nx2N), 2N×N segmentation (PART_2NxN), 2N×nU segmentation (PART_2NxnU), 2N×nD segmentation. (PART_2NxnD), N×2N division (PART_Nx2N), nL×2N division (PART_nLx2N), and nR×2N division (PART_nRx2N). Only the coding block D of the smallest coding block, the partition mode (PartMode) is 2N×2N partition (PART_2Nx2N), 2N×N partition (PART_2NxN), 2N×nU partition (PART_2NxnU), 2N×nD partition (PART_2NxnD), N×N division (PART_NxN) may be defined in addition to N×2N division (PART_Nx2N), nL×2N division (PART_nLx2N), and nR×2N division (PART_nRx2N). Further, the reason why the N×N division (PART_NxN) is not defined outside the minimum coding block is that, outside the minimum coding block, the coding block cannot be divided into four to represent a smaller coding block.

When the prediction mode (PredMode) is the intra mode (MODE_INTRA), except for the minimum coding block, that is, the coding block D (the luminance signal of the embodiment is 8×8 pixels), the partition mode (PartMode) defines only 2N. × 2N partition (PART_2Nx2N), only the coding block D of the minimum coding block, and the partition mode (PartMode) defines 2N×2N partition (PART_2Nx2N) and N×N partition (PART_NxN). Further, the reason why the N×N division (PART_NxN) is not defined outside the minimum coding block is that, outside the minimum coding block, the coding block cannot be divided into four to represent a smaller coding block.

(About intra prediction, intra prediction mode)

In intra-picture prediction, the value of the pixel of the processing target block is predicted based on the value of the pixel of the surrounding decoded block in the same image. In the encoding device and the decoding device of the present embodiment, intra-frame prediction is performed by selecting from among 34 kinds of intra-screen prediction modes. The intra prediction mode (intraPredMode) is a vertical prediction (intra picture prediction mode intraPredMode=0) that is predicted in the vertical direction according to the decoded block above, and is predicted in the horizontal direction according to the decoded block on the left side. Horizontal prediction (intra-picture prediction mode intraPredMode=1), an average value is calculated from the surrounding decoded blocks to perform prediction average prediction (intra-picture prediction mode intraPredMode=2), and obliquely 45 according to surrounding decoded blocks In addition to the average prediction of the angle of the degree (intraPredMode=3), 31 kinds of angle predictions for predicting in the direction inclined at various angles according to the surrounding decoded blocks are defined (intra-picture prediction mode intraPredMode=4) ...34).

In-screen prediction mode used for intra-prediction prediction from the video signal around the encoded/decoded mode in the intra-picture mode (MODE_INTRA), the luminance signal and the color difference signal are separately prepared, and the luminance signal is used in the screen. The prediction mode is defined as an intra-picture luminance prediction mode, and an intra-picture prediction mode for a color difference signal is defined as an intra-screen color difference prediction mode. In the intra-picture luma prediction mode encoding and decoding, the correlation is determined by the intra-picture luma prediction mode of the neighboring block, and the intra-picture luma prediction mode of the peripheral block is determined on the encoding side. The specific information transmitted by the referenced block is transmitted. If it is determined that the prediction is based on the intra-picture brightness prediction mode of the peripheral block, it is better to set a different value for the intra-picture brightness prediction mode. The mechanism for encoding or decoding the value of the intra-picture luminance prediction mode is to adopt such a mechanism. The prediction is predicted by the intra-picture luminance prediction mode of the neighboring block. By decoding the intra-picture luminance prediction mode of the target block, the amount of code transmitted can be reduced. On the other hand, in the intra-picture color difference prediction mode encoding and decoding, the correlation between the intra-picture luminance prediction modes of the prediction blocks of the luminance signal at the same position as the prediction block of the color difference signal is used, and it is judged on the encoding side. When the prediction is performed according to the intra-picture luminance prediction mode, the value of the intra-screen chrominance prediction mode is predicted based on the value of the intra-picture luminance prediction mode, and if it is determined that the prediction is based on the intra-picture luminance prediction mode, it is not as good as When the color difference prediction mode sets a value unique to itself, the value of the intra-screen color difference prediction mode is encoded or decoded, and such a mechanism is employed. By predicting the intra-screen chrominance prediction mode based on the intra-picture luminance prediction mode, the amount of code transmitted can be reduced.

(About PCM encoding in the screen)

In the embodiment, in the intra-screen mode (MODE_INTRA), in addition to the intra-screen predictive coding that performs intra-picture prediction based on the encoded/decoded surrounding video signal, the non-use picture is defined. The compression processing of intra prediction, inter-picture prediction, orthogonal conversion, quantization, etc., directly encodes the video signal into the intra-picture PCM code of the PCM signal without compression. In the PCM in the picture, along with the coding block The size and the bit depth of the PCM signal, the amount of encoding will be a fixed length, so it can be used as an emergency mode to ensure the coding amount of the specified unit. Further, when the amount of encoding is increased when the quantization is performed, the PCM encoding in the uncompressed picture is selected, and sometimes the encoding can be performed with a small amount of encoding. In addition, it is also possible to support and perform all-in-one image signal PCM coding in the picture to become lossless coding. The intra-picture PCM coding is performed in coding block units.

(conversion block)

Similarly to the prior art, in the present embodiment, DCT (Discrete Cosine Transform), DST (Discrete Sine Transform), or the like is used, and the discrete signal is converted into orthogonal conversion and inverse conversion in the frequency domain to reduce the amount of coding. The coding block can be adapted to the texture in the image. In order to optimize the coding process, the luminance signal and the color difference signal in the coding block can be recursively divided into 4 segments, and then smaller. Block unit for conversion, or inverse conversion. A block that has been divided as an object of orthogonal transform or inverse orthogonal transform is defined as a conversion block as needed.

(quantization parameter)

In the embodiment, the quantization parameter required to derive the magnitude of the quantization step when the coefficients that have been orthogonally converted are quantized is set and transmitted in the quantized group block unit described below. By controlling the value of this quantization parameter on the encoding side, the size of the quantization step can be controlled, the amount of coding can be controlled, and the subjective image quality can be controlled. Quantize by setting the value of the quantization parameter to be small The stepping will be smaller and can be finely quantified. In this case, although a large amount of code is required, the deterioration of the image can be reduced, and the coding distortion such as block distortion or mosquito noise can be prevented from becoming conspicuous. On the other hand, by setting the value of the quantization parameter to be large, the quantization step becomes large and coarse quantization can be performed. In this case, although the encoding can be performed with a small amount of encoding, the deterioration of the image is high, and the coding distortion such as block distortion or mosquito noise is likely to become conspicuous. In an embodiment, the quantization parameter QPY may take a value of -QpBdOffsetY to 51. The variable QpBdOffsetY is a variable that is set according to the bit depth of the encoded video signal, and is derived from the following equation. QpBdOffsetY=6 * bit_depth_luma_minus8, where the variable bit_depth_luma_minus8 is a syntax element set according to the bit depth of the encoded luminance signal, with a value after subtracting 8 from the value of the bit depth of the encoded luminance signal . When the bit depth of the luminance signal is 8 bits, the values of bit_depth_luma_minus8 and QpBdOffsetY are all 0. When 10 bits, the value of bit_depth_luma_minus8 is 2, and the value of QpBdOffsetY is 12.

Then, the quantization parameter QPY' of the luminance signal actually used for quantization and inverse quantization, and the quantization parameters QPCb' and QPCr' of the color difference signals Cb and Cr are derived by the following equation. QPY'=QPY+QpBdOffsetY QPCb'=QPY+cb_qp_offset+QpBdOffsetC QPCr'=QPY+cr_qp_offset+QpBdOffsetC, where the variable QpBdOffsetC is a variable that is set according to the bit depth of the encoded color difference signal, and is of the following formula Is exported. QpBdOffsetC=6 * bit_depth_chroma_minus8 wherein the variable bit_depth_chroma_minus8 is a syntax element set according to the bit depth of the encoded color difference signal, with a value after subtracting 8 from the value of the bit depth of the encoded color difference signal. . When the bit depth of the color difference signal is 8 bits, the values of bit_depth_chroma_minus8 and QpBdOffsetC are 0. When 10 bits, the value of bit_depth_luma_minus8 is 2, and the value of QpBdOffsetC is 12. Further, the quantization parameter QPY' of the luminance signal can take a value of 0 to 51 + QpBdOffsetY. Further, the quantization parameters QPCb' and QPCr' of the color difference signals Cb and Cr can take values of 0 to 51 + QpBdOffsetC.

(quantized group block)

In the embodiment, the basic unit of the quantization parameter, that is, the quantized group block is defined, and one quantization parameter is set for each quantized group block.

(tree block, coding block, prediction block, conversion block location)

The position of each block headed by the tree block, the coding block, the prediction block, and the conversion block in this embodiment is such that the pixel position of the leftmost luminance signal of the image of the luminance signal is the origin (0, 0). The pixel position of the leftmost luminance signal included in each block field is represented by a two-dimensional coordinate of (x, y). The direction of the coordinate axis is a direction in which the horizontal direction is toward the right direction and the direction perpendicular to the vertical direction is a positive direction, and the unit is a pixel unit of the luminance signal. The image size (number of pixels) on the luminance signal and the color difference signal is the same. The color difference format is 4:4:4. Needless to say, the image size (pixel number) on the luminance signal and the color difference signal is different. The color difference format is 4:2:0. In the case of 4:2:2, the position of each block of the color difference signal is also represented by the coordinates of the pixel of the luminance signal included in the field of the block, and the unit is 1 pixel of the luminance signal. By designing this, not only the position of each block of the color difference signal can be specified, but also by comparing the values of the coordinates, the positional relationship between the block of the luminance signal and the block of the color difference signal is also clear. In the embodiment, regardless of the type of the color difference format or the shape and size of the block, only when the coordinates of the block of the defined luminance signal and the values of the x and y components of the block of the color difference signal are the same. These blocks are defined as the same location.

Fig. 1 is a block showing the configuration of a video encoding apparatus according to an embodiment. The video encoding device according to the embodiment includes an image memory 101, a quantization parameter determining unit 102, an intra-screen prediction unit 103, a PCM encoding unit 104, an inter-picture prediction unit 105, an encoding method determining unit 106, and a residual signal generating unit 107. Orthogonal conversion ‧ quantization unit 108, inverse quantization ‧ inverse The orthogonal transform unit 109, the decoded video signal superimposing unit 110, the deblocking filter unit 111, the encoded information storage memory 112, the first decoded video memory 113, the second decoded video memory 114, and the first encoded bit sequence The generating unit 115, the second encoding bit sequence generating unit 116, the third encoding bit column generating unit 117, the encoding bit column multiplexing unit 118, and the switch 119.

In the image memory 101, the image signal of the encoding target supplied in chronological order is temporarily stored. The image signals of the coded objects stored in the image memory 101 are sorted into a coding order, and are divided into respective coding block units corresponding to the set complex combination, and then divided into respective prediction block units. It is supplied to the intra-screen prediction unit 103, the inter-screen prediction unit 105, and the residual signal generation unit 107.

The quantization parameter determining unit 102 determines the quantization parameter in units of quantized group blocks from the viewpoints of encoding amount control, adaptive quantization, and the like. The determined quantization parameter is supplied to the encoding method determination unit 106, the orthogonal conversion ‧ quantization unit 108, the inverse quantization ‧ inverse orthogonal conversion unit 109, and stored in the encoded information storage memory 112.

The intra-screen prediction unit 103 is for the encoding target based on the decoded video signal stored in the first decoded video memory 113 in the prediction block unit corresponding to each partition mode (PartMode) in the complex coding block unit. The luminance signal and the color difference signal of the prediction block are respectively subjected to intra-screen prediction corresponding to the intra-picture luminance prediction mode and the intra-screen color difference prediction mode to obtain an intra-frame prediction signal.

Obtaining the intra-frame prediction signal of the prediction block unit per pixel from the signal of the coding object supplied by the prediction block unit Predict residual signal. The prediction residual signal is used to calculate an evaluation value required for evaluating the amount of coding and the amount of distortion, and the block unit is predicted, and from among the complex intra-picture prediction modes, the optimal coding amount and the distortion amount are selected. The optimal mode is used as a candidate for the intra prediction of the prediction block, and the intra prediction information, the intra prediction signal, and the intra prediction prediction value corresponding to the selected intra prediction mode are supplied to the coding. Method decision unit 106.

The PCM encoding unit 104 arranges the PCM signals required to be encoded into PCM signals in units of coding blocks. The PCM signal generated by the PCM encoding unit 104 is determined by the size of the code block and the bit depth of the signal. Further, since there is no coding degradation and no coding distortion occurs, the amount of distortion is set to zero. These code amounts and distortion amounts are used as evaluation values of PCM code in the picture, and are supplied to the coding method determination unit 106 together with the PCM signal.

The inter-screen prediction unit 105 is based on the unit corresponding to each partition mode (PartMode) in the complex coding block unit, that is, the prediction block unit, based on the decoded video signal stored in the second decoded image memory 114. The inter-picture prediction mode (L0 prediction, L1 prediction, and bi-prediction) and each inter-picture prediction corresponding to the reference picture are obtained, and an inter-picture prediction signal is obtained. At this time, motion vector exploration is performed, and inter-picture prediction is performed in accordance with the motion vector that is explored. In addition, in the case of bi-prediction, two inter-picture prediction signals are averaged per pixel or added to perform inter-picture prediction for bi-prediction. Calculating the prediction block unit per pixel from the signal of the coding object supplied by the prediction block unit The inter-picture prediction signal obtains the prediction residual signal. Using the prediction residual signal to calculate an evaluation value required for evaluating the amount of coding and the amount of distortion, in order to predict the block unit, and selecting from the viewpoint of the optimal coding amount and the distortion amount from among the complex inter-picture prediction modes The optimal mode is used as a candidate for the inter-picture prediction of the prediction block, and the inter-picture prediction information, the inter-picture prediction signal, and the inter-picture prediction evaluation value corresponding to the selected inter-picture prediction mode are supplied to the coding. Method decision unit 106.

The coding method determination unit 106 is based on the intra-screen prediction evaluation value corresponding to the intra-screen prediction information selected by each of the prediction blocks in the complex coding block unit, and the inter-frame prediction evaluation value corresponding to the inter-frame prediction information. Determining the optimal coding block division method, prediction mode (PredMode), partition mode (PartMode), whether to encode into a PCM signal, and a division method of the conversion block, and a segmentation method including the coding block conforming to the decision, and a representation Whether or not to encode the intra-frame prediction information or the inter-picture prediction information of the information of the PCM signal is supplied to the second coded bitstream generation unit 116 and stored in the coded information storage memory 112, which is in accordance with the determined decision. The prediction signal that has been predicted by the intra-frame prediction or the inter-picture is supplied to the residual signal generating unit 107 and the decoded video signal overlapping unit 110. Then, the quantization parameter that conforms to the determination and the division method of the conversion block are supplied to the orthogonal transform ‧ quantization unit 108, inverse quantization ‧ inverse orthogonal transform unit 109, third coded bit sequence generation unit 117, and stored to the code Information storage memory 112. Moreover, when the intra-picture PCM code is selected, it is supplied to the second coded bit line generation unit 116.

The residual signal generation unit 107 is a coding method determination unit. In 106, when it is determined that intra-picture prediction or inter-picture prediction is performed, a residual signal is generated by subtracting a prediction signal that has been predicted by intra-picture prediction or inter-picture from each pixel of the encoded video signal. It is supplied to the orthogonal conversion ‧ quantization unit 108.

Orthogonal conversion ‧ The quantization unit 108 determines the residual signal supplied from the encoding method determining unit 106 when using the intra-frame prediction or the inter-picture prediction when the encoding method determining unit 106 determines to encode the residual signal supplied from the encoding method determining unit 106. The quantization parameter QPY' of the luminance signal derived from the quantization parameter QPY supplied from the parameter determination unit 102, and the quantization parameters QPCb' and QPCr' of the color difference signals of the color difference signals Cb and Cr are converted into frequencies such as DCT or DST. The orthogonal transform and quantization of the domain generate a residual signal that has been orthogonally converted and quantized, and is supplied to the third coded bitstream generation unit 117 and the inverse quantization and inverse orthogonal transform unit 109.

The first coded bitstream generation unit 115 calculates the values of the syntax elements related to the coded information of the sequence, the image, and the slice unit in accordance with the meaning of the syntax element and the semantic rule of the definition derivation method, and calculates the calculated values of the syntax elements. The value of the syntax element is subjected to entropy coding such as variable length coding and arithmetic coding according to the grammar rule, and the first coded bitstream column is generated, and the encoded first coded bitstream column is supplied to the coded bitstream column to be multiplexed. Department 118.

The second coded bitstream generation unit 116 calculates the segmentation information of the coding block and the coding information of the coding block unit for each tree block in accordance with the meaning of the syntax element and the semantic rule of the definition derivation method. The value of the syntax element related to the encoded information determined by the encoding method determining unit 106 is calculated for each prediction block. Specifically, in addition to calculating the code The coding information of the coding block unit such as the segmentation method of the block, the prediction mode (PredMode), and the division mode (PartMode), and the value of the syntax element related to the coding information of the prediction block unit are also calculated. When the prediction mode (PredMode) is the intra mode (MODE_INTRA) and the intra prediction coding is performed, the syntax element pcm_flag indicating whether or not the intra-picture PCM coding is set to 0, and the intra-picture luminance prediction mode and the intra-picture color difference are calculated. The value of the syntax element related to the intra prediction mode of the prediction mode is set to 1 if the intra-picture mode (MODE_INTRA) and intra-picture PCM coding is used, and if the intra-picture PCM coding syntax element pcm_flag is set to 1, if the prediction mode (PredMode) is an inter-picture mode (MODE_INTER), and calculates a value of a syntax element related to inter-picture prediction mode, information for specifying a reference picture, and inter-picture prediction information such as a motion vector. The values of the grammatical elements that have been calculated are subjected to entropy coding such as variable length coding and arithmetic coding according to grammar rules, to generate a second coding bit sequence, and to supply the encoded second coding bit sequence to The bit row multiplexer 118 is encoded. Then, if it is PCM coded in the picture, the PCM signal is encoded.

The third coded bitstream generation unit 117 encodes the segmentation information and the quantization parameter information of the conversion block. The residual signal that has been orthogonally converted and quantized is subjected to entropy coding such as variable length coding and arithmetic coding according to a predetermined syntax rule to generate a third coding bit sequence, and the third coding bit sequence is supplied to The bit row multiplexer 118 is encoded. The detailed processing of the quantization parameter information coding will be described later.

In the coded bit column multiplexing unit 118, the first code is used The bit sequence, the second coded bitstream, and the third coded bitstream are multiplexed according to a predetermined grammar rule to generate a bitstream, and the multiplexed bitstream is streamed and output. .

The inverse quantization ‧ inverse orthogonal transform unit 109 converts the residual signal that has been orthogonally converted and quantized by the orthogonal transform ‧ quantization unit 108 using the quantization parameter QPY supplied from the quantization parameter determining unit 102 The quantization parameter QPY′ of the derived luminance signal and the quantization parameters QPCb′ and QPCr′ of the color difference signals of the color difference signals Cb and Cr are subjected to inverse quantization and inverse orthogonal conversion to calculate a residual signal, which is supplied to the decoded video signal overlapping unit. 110. The decoded video signal superimposing unit 110 inversely quantizes the prediction signal that has been subjected to intra-frame prediction or inter-picture prediction with the inverse quantization ‧ inverse orthogonal transform unit 109 as determined by the encoding method determination unit 106 The residual signals after the inverse orthogonal transform are superimposed to generate a decoded image, which is stored in the first decoded image memory 113.

The deblocking filter unit 111 performs decoding of the decoded video stored in the first decoded video memory 113 in accordance with the encoded information stored in the encoded information storage memory 112 to reduce block distortion caused by encoding, and the like. The filtering process is then stored in the second decoded image memory 114. The detailed processing of the deblocking filter unit 111 will be described later.

Fig. 2 is a block diagram showing the configuration of the video decoding device according to the embodiment corresponding to the video encoding device of Fig. 1. The video decoding device according to the embodiment includes a coded bit column separation unit 201, a first coded bitstream decoding unit 202, a second coded bitstream decoding unit 203, a third coded bitstream decoding unit 204, and quantization parameters. Derivation unit 205 and intra-screen prediction unit 206, PCM decoding unit 207, inter-picture prediction unit 208, inverse quantization ‧ inverse orthogonal conversion unit 209, decoded video signal superimposing unit 210, deblocking filter unit 211, coded information storage memory 212, and first decoded video memory The body 213, the second decoded video memory 214, and the switches 215, 216, and 217.

The bit stream supplied to the coded bit column separation unit 201 is separated according to a predetermined syntax rule, and the first code bit sequence indicating the coded information of the sequence, the image, and the slice unit is supplied to the first bit. The coded bitstream decoding unit 202 supplies the second coded bitstream including the coded information of the coded block unit to the second coded bitstream decoder unit 203, and includes the residual signal that has been orthogonally converted and quantized. The third coded bitstream is supplied to the third coded bitstream decoding unit 204.

The first coded bitstream decoding unit 202 entropy decodes the supplied first coded bitstream according to a grammar rule, and obtains values of syntax elements related to the coded information of the sequence, the image, and the slice unit. According to the meaning of the grammatical elements, defining the semantic rules of the derivation method, and calculating the coding information of the sequence, the image, and the slice unit according to the values of the related grammatical elements of the decoded sequence, the image, and the coding information of the slice unit. . The first coded bitstream decoding unit 202 corresponds to the coded bitstream decoding unit of the first coded bitstream generation unit 115 on the encoding side, and has a sequence including the coded by the first coded bitstream generation unit 115. The encoded bit column of the encoded information of the image, and the slice unit, restores the function of each encoded information. The coded information of the sequence, image, and slice unit obtained by the first coded bitstream decoding unit 202 is supplied to the coded information storage memory 212. And is used in all blocks not shown.

The second coded bitstream decoding unit 203 entropy decodes the supplied second coded bitstream according to a grammar rule, and obtains the segmentation information, the coded block, and the prediction of the coded block for each tree block. The values of the relevant grammatical elements of the block information of the block unit. Decoding the segmentation information of the supplied coding block according to the meaning of the grammatical element and defining the semantic rules of the derived method, and according to the coding block unit and the value of the related grammatical element of the coding information of the prediction block unit, The coding information of the coding block unit and the prediction block unit is calculated. The second coded bitstream decoding unit 203 corresponds to the coded information calculation unit of the second coded bitstream generation unit 116 on the encoding side, and has a coded block including the coded block encoded by the second coded bitstream generation unit 116. And the second coded bit column that predicts the coding information of the block unit, and restores the function of each coded information. Specifically, the decoding method of the coding block, the prediction mode (PredMode), and the prediction mode of the division mode (PartMode) are decoded from the syntax elements obtained by decoding the second coding bit sequence in accordance with a predetermined syntax rule. (PredMode) is an intra-picture mode (MODE_INTRA), and is used to indicate whether or not the PCM-encoded syntax element pcm_flag in the picture is decoded. If pcm_flag is 0, it is intra-picture prediction coding, and an intra-picture prediction mode including an intra-picture luminance prediction mode and an intra-screen color difference prediction mode is obtained. If pcm_flag is 1, it is PCM coded in the picture, and the PCM signal is obtained. On the other hand, if the prediction mode (PredMode) is the inter-picture mode (MODE_INTER), the inter-picture prediction mode, the information for specifying the reference picture, the motion vector, and the like are obtained. If the prediction mode (PredMode) is the screen When the internal mode (MODE_INTRA) and the pcm_flag are 0, the intra-screen prediction mode including the intra-screen luminance prediction mode and the intra-screen chroma prediction mode is supplied to the intra-screen prediction unit 206 via the switch 215, and the prediction mode (PredMode) is used. In the inter-picture mode (MODE_INTER), the inter-picture prediction mode, the information for specifying the reference picture, and the inter-picture prediction information such as the motion vector are supplied to the inter-picture prediction unit 208 via the switch 215. The PCM signal is supplied to the PCM decoding unit 207 in the case of intra-picture PCM coding.

The third coded bitstream decoding unit 204 decodes the supplied coded bitstream to obtain the split information of the converted block, the quantization parameter information, and the residual signal that has been orthogonally converted and quantized, and is already positive. The residual ‧ quantized residual signal is supplied to the inverse quantization ‧ inverse orthogonal transform unit 209. Then, the quantization parameter information (syntax element cu_qp_delta, which will be described later) is supplied to the quantization parameter deriving unit 205. The quantization parameter derivation unit 205 derives the quantization parameter QPY from the supplied quantization parameter information (the syntax element cu_qp_delta to be described later) and the coding information obtained by the first coding bit column decoding unit 202, and supplies the quantization parameter QPY to the inverse quantization ‧ The conversion unit 209 is exchanged and stored in the encoded information storage memory 212.

The intra-screen prediction unit 206 is based on the decoded intra-prediction mode including the intra-screen luminance prediction mode and the intra-screen chroma prediction mode, and the decoded peripheral block stored in the first decoded video memory 213. The predicted video signal is generated by intra-picture prediction, and the predicted video signal is supplied to the decoded video signal overlapping unit 210 through the switch 216. Further, in the present embodiment, the prediction mode is based on the brightness in the screen. When the value of the formula is used to predict the value of the intra-picture color difference prediction mode, the method of deriving the intra-picture color difference prediction mode differs depending on the color difference format. At this time, intra-screen prediction is performed using an intra-screen prediction mode that is derived in accordance with a method different from the color difference format.

The PCM decoding unit 207 performs decoding processing of the input signal to obtain a PCM signal of the coding block unit. The PCM signal of the obtained coding block unit is stored in the first decoded image memory 213 through the switch 217.

The inter-screen prediction unit 208 uses the inter-picture prediction mode supplied, the information for specifying the reference picture, the inter-picture prediction information such as the motion vector, and the decoded reference stored in the second decoded video memory 214. The image is generated by using motion compensated inter-picture prediction to generate a predicted video signal, and the predicted video signal is supplied to the decoded video signal overlapping unit 210 via the switch 216. In addition, in the case of double prediction, the two motion compensated prediction image signals for the L0 prediction and the L1 prediction are adaptively multiplied by the weight coefficients to generate a final predicted image signal.

The inverse quantization ‧ inverse orthogonal transform unit 209 uses the quantization parameter QPY' of the luminance signal derived from the quantization parameter QPY supplied from the quantization parameter deriving unit 205, and the quantization parameter QPCb of the color difference signal of the color difference signals Cb and Cr ', QPCr', and the residual signal that has been orthogonally converted and quantized by the third coded bit column decoding unit 204 is subjected to inverse orthogonal transform and inverse quantization to obtain inverse orthogonal transform. The inverse quantized residual signal.

The decoded video signal overlapping unit 210 is already pre-screened The predicted video signal predicted by the measuring unit 206 or the inter-picture predicting unit 208 and the inverse orthogonal transform unit 209 are inverse orthogonally converted. The inverse quantized residual signals are superimposed to decode the decoded video signal and stored in the first decoded video memory 213 through the switch 217.

The deblocking filter unit 211 performs filtering processing for reducing the block distortion caused by the encoding on the decoded video stored in the first decoded video memory 213, and stores the result in the second decoded video memory 214. The decoded video signals stored in the second decoded video memory 214 are output in the order of output.

Next, the quantized group block of the first aspect of the embodiment will be described in detail.

As described above, in the present embodiment, a quantization group block in which a quantization parameter is encoded is defined, and a quantization parameter is set for each quantization group block. Fig. 5 is an explanatory diagram of an example of quantizing a group block. In FIG. 5, blocks A, B0, B1, B2, C0, C1, C2, and D0, D1, D2, and D3 depicted by solid lines are coded blocks, and blocks depicted by broken lines are quantized groups. Block. In the example shown in Fig. 5, the size of the tree block is set to 64 x 64 pixels for the luminance signal and 32 x 32 pixels for the color difference signal. The coding block A does not divide the tree block, but is regarded as one coding block. The size of the coding block A is 64×64 pixels in the luminance signal and 32×32 pixels in the color difference signal. The coding blocks B0, B1, and B2 are coding blocks formed by dividing the tree block into four. The coding blocks B0, B1, and B2 are of a size of 32×32 pixels and a color difference signal of 16×. 16 pixels. Code blocks C0, C1, C2 are the tree areas The block is divided into four blocks and then divided into four blocks. The coding blocks C0, C1, and C2 are of a size of 16×16 pixels and a color difference signal of 8×8 pixels. The code blocks D0, D1, D2, and D3 are code blocks formed by dividing the tree block into 4 blocks and then dividing the block by 2 degrees, and coding blocks D0, D1, D2, and D3. The size is 8×8 pixels for the luminance signal and 4×4 pixels for the color difference signal. In the example shown in FIG. 5, the size of the quantized group block is set to 32×32 pixels in the luminance signal, and the color difference signal is set to 16×16 pixels.

In the present embodiment, the quantization parameters of the coding block and the conversion block existing at the same position as the quantization group block are the same. The size of the quantized group block can also be set to be the same as the size of the tree block, or can be set to be smaller. Even the size of the quantized group block may be the same as the size of the coded block, or may be larger or smaller than the size of the coded block.

When the size of the quantized group block is smaller than the size of the coded block, although the quantized group block may contain a plurality of code blocks, the quantization parameters of the code blocks are the same value. In the example shown in FIG. 5, the quantization parameters of the four coding blocks D0, D1, D2, and D3 smaller than the rightmost quantization group block are set to the same value.

When the size of the quantized group block is larger than the size of the coded block, although the plurality of quantized group blocks are included in the code block, the quantization parameters of the quantized group blocks are the same value. In the example shown in FIG. 5, the quantization parameters of the 16 quantized group blocks included in the coding block A are set to the same value, and the four quantities included in the coding block B0. The quantization parameters of the group block are set to the same value, and the quantization parameters of the four quantized group blocks included in the code block B1 are set to the same value, and the four quantizations included in B2. The quantization parameters of the group block are set to the same value.

Next, the determination, encoding/decoding, and derivation of the quantization parameter of the first aspect of the embodiment will be described in detail.

Fig. 6 is a flow chart for explaining the determination of the quantization parameter and the description of the encoding processing program. These processes are performed by the quantization parameter determination unit 102 and the third coding bit sequence generation unit 117 of the video encoding device. The processing of steps S1102 to S1122 is performed for each slice in the image (steps S1101 to S1123). Then, the processing of steps S1103 to S1121 is performed for each coding tree block in the slice (steps S1102 to S1122).

First, quantization parameter QPY quantization is determined for each quantized group block in the coding tree block (steps S1103 to S1105). These processes are performed in the quantization parameter determination unit 102 of the video encoding device. The quantization parameter QPY is used in the encoding amount control. When the amount of encoding decreases, a larger value is set for the quantization parameter QPY, and when the amount of encoding increases, a smaller value is set for the quantization parameter QPY. When it is used to adjust the adaptive quantization required for subjective image quality, the coded column will be easy to quantize the quantized group block, which is a large value for the quantization parameter QPY, and the quantization group is easy to be conspicuous. The quantization parameter QPY sets a smaller value.

Next, the processing of steps S1107 to S1120 is performed by encoding each coding block in the coding tree block to encode the quantization parameter QPY of the quantized group block (steps S1106 to S1121). These treatments The video encoding device is implemented in the third coded bitstream generation unit 117. When the quantization parameter QPY is encoded, the syntax element cu_qp_delta is derived, and the derived syntax element cu_qp_delta is encoded.

First, when the coding block that is the target is located at the beginning of the quantization group block in the coding order (YES in step S1107), it is used to represent the quantized group block corresponding to the coding block that is the object. Whether or not the syntax element cu_qp_delta corresponding to QPY has the encoded variable IsCuQpDeltaCoded set to 0 (step S1108), and the predicted value QPPRED of the quantization parameter is derived (step S1109). The processing of step S1109 will be described in detail using FIG.

Next, the value of the predicted value QPPRED of the quantization parameter derived in step S1109 is set to QPY of the quantized group block of the encoded information storage memory 112 (step S1110). When the coded information storage memory 112 is set, if the size of the coded block is larger than the size of the quantized group block, the value of the predicted value QPPRED of the same quantization parameter is set to the coding area. The quantization parameter QPY of all quantized group blocks included in the block.

On the other hand, if the coding block that is the target is not located at the beginning of the quantization group block in the coding order (NO in step S1107), the process proceeds to step S1111.

Next, when the coding block is intra-picture PCM coding (NO in step S1111), the processing of steps S1112 to S1220 is skipped and the process proceeds to step S1221. If the coding block is not in-picture PCM coding (step In step S1111, YES), the quantization parameter QPY of the quantized group block is encoded by performing the processing of steps S1113 to S1119 for each of the conversion blocks in the coding block (steps S1112 to S1120). First, the values of the variables cbf_luma, cbf_cb, and cbf_cr of the conversion block that is the target are determined (step S1113). Here, the variable cbf_luma is a coefficient (non-zero coefficient) in which the conversion block of the luminance of the object is non-zero, and is 1 when the coefficient is encoded, and does not include a coefficient other than 0, and is 0 when the coefficient is not encoded. Variables. The variable cbf_cb is a variable containing a coefficient (non-zero coefficient) of a non-zero conversion block of the color difference Cb of the object, and a coefficient of 1 when the coefficient is encoded, and a coefficient of 0 when the coefficient is not encoded and 0 is not encoded. . The variable cbf_cr is a variable containing a coefficient of non-zero (non-zero coefficient) of the color difference Cr of the object, and a coefficient of 1, when the coefficient is encoded, and a coefficient of 0 when the coefficient is not encoded and 0 is not encoded. . When any of the variables cbf_luma, cbf_cb, and cbf_cr of the target conversion block is 1 (YES in step S1113), the processing of steps S1114 to S1119 is performed, when the variables of the conversion block cbf_luma, cbf_cb, and cbf_cr are converted. When none of them is 1, that is, when all of them are 0 (NO in step S1113), the processing of steps S1114 to S1119 is skipped, and the processing proceeds to step S1120.

In step S1114, the variable IsCuQpDeltaCoded is determined (step S1114), and if the variable IsCuQpDeltaCoded is 0 (YES in step S1114), the processing of steps S1115 to S1118 is performed, and if the variable IsCuQpDeltaCoded is 1 (NO in step S1114), skipping The processing of steps S1115 to S1118 proceeds to step S1119.

The value of the quantization parameter QPY of the quantized group block set in step S1104 is set to the quantization parameter QPY of the quantized group block of the encoded information storage memory 112 (step S1115). When the size of the coded block is larger than the size of the quantized group block, the value of the same quantization parameter QPY is set to the code block. The quantization parameter QPY of all quantized group blocks included. The quantization parameter QPY of the quantized group block stored in the encoded information storage memory 112 is overwritten in step S1110.

In step S1116, the syntax element cu_qp_delta is derived by the following equation (step S1116). QPDIFF=QPY-QPPRED cu_qp_delta=(QPDIFF+78+QpBdOffsetY+(QpBdOffsetY/2))%(52+QpBdOffsetY)-26-(QpBdOffsetY/2); wherein the variable QpBdOffsetY is set according to the bit depth of the image signal The variable is 0 in 8-bit and 12 in 10-bit.

Next, the syntax element cu_qp_delta is entropy encoded (step S1117), the variable IsCuQpDeltaCoded is set to 1 (step S1118), and the coefficients of the conversion block are encoded (step S1119).

If the processing of all the conversion blocks in the coding block is completed, the process proceeds to step S1111 to perform the processing of the next coding block.

If all the coding blocks in the coding tree block are processed If yes, proceed to step S1122 to perform processing of the next coding tree block.

If the processing of all the coding tree blocks in the slice is completed, the process proceeds to step S1123 to perform the processing of the next slice.

If the processing of all the slices in the slice is completed, the quantization parameter determination and the encoding process are ended.

Figure 7 is the decoding of the quantization parameters. The flow chart is used to describe the export handler. These processes are performed in the quantization parameter deriving unit 205 of the video decoding device. However, the entropy decoding process of step S1212 is performed by the third coded bitstream decoding unit 204 of the video decoding device. The processing of steps S1202 to S1219 is performed for each slice in the image (steps S1201 to S1220). Then, the processing of steps S1203 to S1218 is performed for each coding tree block in the slice (steps S1202 to S1219).

Next, the processing of steps S1204 to S1217 is performed on each coding block in the coding tree block to decode and derive the quantization parameter QPY of the quantized group block (steps S1203 to S1218). These processes are implemented in the video encoding device in the third coded bitstream decoding unit 204 and the quantization parameter deriving unit 205. When the quantization parameter QPY is derived, the predicted value QPPRED of the quantization parameter is derived, the syntax element cu_qp_delta is decoded, and the quantized parameter QPY is derived using the decoded syntax element cu_qp_delta.

First, when the coding block that is the target is located at the beginning of the quantization group block in the decoding order (YES in step S1204), it is used to represent the quantized group block corresponding to the coding block that is the object. Whether the syntax element cu_qp_delta corresponding to QPY has decoded variables IsCuQpDeltaCoded is set to 0 (step S1205), and the predicted value QPPRED of the quantization parameter QPY is derived (step S1206). The processing of step S1206 will be described in detail using FIG.

Next, the value of the predicted value QPPRED of the quantization parameter derived in step S1109 is set to the quantization parameter QPY of the quantized group block of the encoded information storage memory 212 (step S1207). When the coded information storage memory 212 is larger than the size of the quantized group block, the size of the coded block is larger, and the value of the predicted value QPPRED of the same quantization parameter is set to the code block. The quantization parameter QPY of all quantized group blocks included.

On the other hand, if the coding block that is the target is not located at the beginning of the quantization group block in the decoding order (NO in step S1204), the process proceeds to step S1208.

Next, when the coding block is intra-picture PCM coding (NO in step S1210), the processing of steps S1209 to S1217 is skipped, and the process proceeds to step S1218. If the coding block is not intra-picture PCM coding (YES in step S1210), the quantization parameter QPY of the quantization group block is to be performed by performing the processing of steps S1210 to S1216 for each conversion block in the coding block. It is decoded and derived (steps S1209 to S1217). First, the values of the variables cbf_luma, cbf_cb, and cbf_cr of the conversion block that is the target are determined (step S1210). Here, the variable cbf_luma is a coefficient (non-zero coefficient) in which the conversion block of the luminance of the object is non-zero, and is 1 when the coefficient is encoded, and does not include a coefficient other than 0, and is 0 when the coefficient is not encoded. Variables. The variable cbf_cb is a conversion block containing the color difference Cb of the object A coefficient that is non-zero (non-zero coefficient) and that is 1 when the coefficient is encoded, does not contain a coefficient other than 0, and is a variable that is 0 when the coefficient is not encoded. The variable cbf_cr is a variable containing a coefficient of non-zero (non-zero coefficient) of the color difference Cr of the object, and a coefficient of 1, when the coefficient is encoded, and a coefficient of 0 when the coefficient is not encoded and 0 is not encoded. . When any of the variables cbf_luma, cbf_cb, and cbf_cr of the target conversion block is 1 (YES in step S1210), the processing of steps S1211 to S1216 is performed, when the variables of the conversion block cbf_luma, cbf_cb, and cbf_cr are converted. When none of them is 1, that is, when all of them are 0 (NO in step S1210), the processing of steps S1211 to S1216 is skipped, and the processing proceeds to step S1217.

In step S1211, the variable IsCuQpDeltaCoded is determined (step S1211), and if the variable IsCuQpDeltaCoded is 0 (YES in step S1211), the processing of steps S1212 to S1215 is performed, and if the variable IsCuQpDeltaCoded is 1 (NO in step S1211), skipping is performed. The processing of steps S1212 to S1215 proceeds to step S1216.

Next, the syntax element cu_qp_delta is entropy decoded (step S1212).

Next, the quantization parameter QPY of the quantized group block is derived by the following equation (step S1213). QPY=(((QPPRED+cu_qp_delta+52+2 * QpBdOffsetY)%(52+QpBdOffsetY))-QpBdOffsetY The variable QpBdOffsetY is a variable that is set according to the bit depth of the image signal.

The value of the quantization parameter QPY of the quantized group block derived in step S1213 is set to the quantization parameter QPY of the quantized group block to the coded information storage memory 212 (step S1214). When the size of the coded block is larger than the size of the quantized group block, the value of the same quantization parameter QPY is set to the code block. The quantization parameter QPY of all quantized group blocks included. The quantization parameter QPY of the quantized group block stored in the encoded information storage memory 212 is overwritten in step S1207.

Next, the variable IsCuQpDeltaCoded is set to 1 (step S1215), and the coefficients of the conversion block are decoded (step S1216).

If the processing of all the conversion blocks in the coding block is completed, the process proceeds to step S1218, where the processing of the next coding block is performed.

If the processing of all the coding blocks in the coding tree block is completed, the process proceeds to step S1219 to perform the processing of the next coding tree block.

If the processing of all the coding tree blocks in the slice is completed, the process proceeds to step S1220 to perform the processing of the next slice.

If the processing of all the slices in the slice is completed, the quantization parameter decoding and derivation processing is ended.

FIG. 8 is a flowchart for explaining the process of deriving the predicted value of the quantization parameter of step S1109 of FIG. 6 and S1206 of FIG. 7. These processes are performed in the third coded bitstream generation unit 117 of the video encoding device and the quantization parameter derivation unit 205 of the video decoding device. First, it is stored to The encoded information storage memory 112 of the video encoding device or the encoded information storage memory 212 of the video decoding device.

Determining whether the left adjacent quantized group block is available, and if the left adjacent quantized group block is available (YES in step S1301), the value of the quantization parameter QPLEFT of the left adjacent quantized group block, If the quantization parameter QPA is set (step S1302), if it is not available (NO in step S1301), the value of the quantization parameter QPPREV of the previous quantization group block in the encoding/decoding order is set to the quantization parameter QPA (step S1303). ).

Determining whether the adjacent adjacent quantized group block is available, and if the upper adjacent quantized group block is available (YES in step S1304), the quantization parameter QPLEFT of the upper adjacent quantized group block is determined. The value is set to the quantization parameter QPB (step S1305), and if it is not available (NO in step S1304), the value of the quantization parameter QPPREV of the previous quantization group block in the encoding/decoding order is set to the quantization parameter QPB. (Step S1306).

Next, the average value of the quantization parameter QPA and the quantization parameter QPB is calculated by the following equation, and is used as the predicted value QPPRED of the quantization parameter (step S1307), and the present quantization parameter derivation processing is ended. QPPRED=(QPA+QPB+1)>>1

Although quantization is not performed in the intra-picture PCM coding, in the present embodiment, quantization parameters are used in deblocking filtering. Thus, the quantization parameter is also set for the coding block of the PCM in the picture. Similarly to the quantization parameter of the non-intra-picture PCM coded block, the quantization parameter of the quantized group block containing the coded block of the intra-picture PCM is regarded as the quantization parameter of the coded block of the PCM in the picture.

The relationship between the size of the PCM block in the picture and the size of the quantized group block and the value of the quantization parameter are described.

When the coding block is intra-picture PCM coding, and the size of the coding block is greater than the size of the quantization group block, the syntax element cu_qp_delta is not encoded, and the value of the quantization parameter QPY of the PCM block in the picture is The predicted value QPPRED of the quantization parameter is equal, and the value of the quantization parameter QPY equal to the predicted value QPPRED of the quantization parameter is stored in the encoded information storage memory 112 of the video encoding device or the encoded information storage memory 212 of the video decoding device. .

If the coding block is intra-picture PCM coding, and the size of the coding block is less than the size of the quantized group block, the syntax element cu_qp_delta in the non-intra-picture PCM coding coding block in the same quantization group block It is possible to be encoded, and the value of the quantization parameter QPY of the coded block of the PCM code in the picture is not necessarily equal to the value of the predicted value QPPRED of the quantization parameter, and the value of the quantization parameter QPY to be encoded/decoded is stored to the image. The encoded information storage memory 112 of the encoding device or the encoded information storage memory 212 of the video decoding device.

In addition, in order to more appropriately set the filtering strength of the deblocking filter to reduce block distortion, even when the coding block is intra-picture PCM coding, the value of the quantization parameter QPY can be encoded/solved. code. In this case, the value of the quantization parameter QPY to be encoded/decoded is stored in the encoded information storage memory 112 of the video encoding apparatus or the encoded information storage memory 212 of the video decoding apparatus.

Next, the encoding/decoding of the deblocking filter of the first aspect of the embodiment will be described in detail. In the present embodiment, the deblocking filter processing is performed on the boundary of the transition block and the prediction block located at the boundary when the image is cut into 8×8 pixel blocks in the luminance signal. Fig. 9 is an explanatory diagram showing an example of a pixel at the boundary of a block. When the vertical edge filtering process is performed, as shown in FIG. 9(a), the block on the left side sandwiching the vertical boundary is the block P, and the block on the right side is the block Q. Then, the pixel p which is the vertical boundary of the filtering object included in the block P is sequentially ordered from the boundary of the block to the left pixel as p0, p1, p2, and p3, and is included in the block Q. The pixel q is sequentially ordered as a pixel q0, q1, q2, q3 from the boundary of the block. Although only the uppermost one line is illustrated, the vertical crossing and the vertical direction are filtered in the horizontal direction. On the other hand, when the horizontal edge filtering process is performed, as shown in FIG. 9(b), the block on the upper side sandwiching the horizontal boundary is the block P, and the block on the lower side is the block Q. Then, the pixel p which is the vertical boundary of the filtering object included in the block P is sequentially ordered as the pixel p0, p1, p2, and p3 from the boundary of the block, and is included in the block Q. The pixel q is sequentially ordered as a pixel q0, q1, q2, q3 from the boundary of the block. Although only the leftmost one line is illustrated, the horizontal crossing and the horizontal direction are filtered in the vertical direction.

The first embodiment will be described. 10, FIG. 11, FIG. 14, FIG. 15, and FIG. 18 are deblocking filter sections 111 and images of the video encoding apparatus. A flowchart of the processing procedure of the first embodiment of the deblocking filter unit 211 of the decoding device will be described. In the video encoding apparatus, all the decoded video signals of the image to be encoded are stored in the first decoded video memory 113, and then subjected to deblocking filter processing by the deblocking filter unit 111, and stored in the first block. 2 Decode the image memory 114. In the video decoding device, all the decoded video signals of the image to be decoded are stored in the first decoded video memory 213, and then subjected to deblocking filter processing by the deblocking filter unit 211, and stored in the first block. 2 Decode the image memory 214.

First, the deblocking filter processing procedure of Fig. 10 will be explained. The processing of steps S2102 and S2103 is repeated for each coding block in the image stored in the first decoded video memory 113 of the video encoding device or the first decoded video memory 213 of the video decoding device (steps S2101 to S2104). ). The horizontal edge filtering processing is performed (step S2102), and the output images p' and q' are stored in the image memory (step S2103). At this time, it is stored in the image memory for temporary storage of intermediate data. Next, the processing of steps S2106 and S2107 is repeated for each code block in the image processed by the deblocking filter (steps S2105 to S2108). The filtering process in the vertical direction of the horizontal edge is performed (step S2106), and the output images p' and q' are stored in the image memory (step S2107). At this time, it is stored in the second decoded video memory 114 of the video encoding device or the second decoded video memory 214 of the video decoding device. The filtering process in the horizontal direction of the vertical edge of step S2102 and the filtering process in the vertical direction of the horizontal edge of step S2106 are different only in the processing direction, and the processing procedures are common, and FIG. 11, FIG. 14, FIG. 15 and FIG. 18 to elaborate.

A deblocking filter processing procedure for each coding block of Fig. 11 will be described. First, the coded information stored in the coded information storage memory 112 or the coded information storage memory 212 is used to derive the boundary of the conversion block in the coded block (step S2201). Figure 12 is an explanatory diagram showing an example of a vertical boundary and a horizontal boundary of a conversion block in a coding block. When the vertical edge filtering process is performed, the boundary between the vertical direction of the conversion block in the coding block is derived from the thick line of FIG. 12(a) on the inner side and the left side of the coding block, and is given to the boundary 3101 of the vertical direction of the conversion block in the coding block. Export. On the other hand, when the horizontal edge filtering process is performed, the horizontal direction of the conversion block in the coding block is derived from the thick line of FIG. 12(b) on the inner side and the upper side of the coding block. Junction 3102 is derived.

Next, the prediction block boundary is derived (step S2202). Figure 13 is an explanatory diagram showing an example of a vertical boundary and a horizontal boundary of a prediction block in a coding block. When the vertical edge filtering process is performed, the boundary between the vertical direction of the prediction block in the coding block is deduced from the inner and left sides of the coding block as indicated by the thick line of FIG. 13(a). Export. On the other hand, when the horizontal edge filtering process is performed, the horizontal direction of the prediction block in the coding block is derived from the thick line of FIG. 13(b) on the inner side and the upper side of the coding block. Junction 3202 is derived.

Next, the strength of the boundary of each block of the conversion block and the prediction block is derived (step S2203). For each block boundary, not the same intensity deblocking filter processing is performed, but the extent of the strength of the deblocking filter should be determined according to the conditions of the boundary of each block. Processing.

When the pixel p0 or q0 is included in the coding block coded by the intra prediction mode, the value of the variable bS indicating the strength of the block boundary is set to 2. The 2 system indicates the value of the strongest intensity.

When the pixel p0 or q0 is not included in the coding block coded in the intra-picture prediction mode, when the pixel p0 or q0 is included in the conversion block containing the non-zero conversion coefficient, the strength of the block boundary will be indicated. The value of the variable bS is set to 1. The 1 indicates the value of the medium intensity.

When the pixel p0 or q0 is not included in the coding block that is encoded in the intra-picture prediction mode, and the pixel p0 or q0 is not included in the conversion block including the non-zero conversion coefficient, the prediction block containing the pixel p0 is When the number of motion vectors differs from the prediction block including the pixel q0 or the prediction vector of the different prediction block, the value of the variable bS indicating the strength of the block boundary is set to 1.

When the pixel p0 or q0 is not included in the coding block that is encoded in the intra-picture prediction mode, the pixel p0 or q0 is not included in the conversion block containing the non-zero conversion coefficient, and the prediction block containing the pixel p0 is When the prediction block containing the pixel q0 is the same reference image and the number of motion vectors of the same prediction block, the value of the motion vector of the prediction block containing the pixel p0 and the motion vector of the prediction block containing the pixel q0 When the value of the motion vector is a difference equal to or greater than the fixed value, the value of the variable bS indicating the strength of the block boundary is set to 1.

When the pixel p0 or q0 is not included in the coding block that is encoded in the intra-picture prediction mode, the pixel p0 or q0 is not included in the non-zero conversion system. The number of conversion blocks includes that the prediction block containing the pixel p0 and the prediction block containing the pixel q0 are the same reference image and the motion vector number of the same prediction block and the motion vector of the prediction block containing the pixel p0 When the value of the motion vector of the motion vector containing the prediction block of the pixel q0 is not greater than the predetermined value, the value of the variable bS indicating the strength of the block boundary is set to 0. The 0 system indicates the weakest intensity. Value.

Next, filtering of the luminance signal is performed (step S2204). The filter processing procedure for the luminance signal of step S2204 will be described in detail using FIG. Next, filtering of the color difference signals is performed (step S2205), and the present deblocking filter processing program is ended. As for the filtering of the color difference signal, it is also the same as the filtering of the luminance signal, and thus detailed description is omitted.

Fig. 14 is a flow chart showing the filtering processing procedure of the signal of step S2204. For each 8×8 block in the coding block (steps S2301 to S2303), filtering of the luminance block edge is performed (step S2302).

Fig. 15 is a flowchart showing a filter processing procedure of the block edge in step S2302 of the first embodiment. First, the quantization parameter QPP of the block P including the pixel p (pixels p0, p1, p2, p3) is obtained (step S3101). The quantization parameter QPQ of the block Q including the pixel q (pixels q0, q1, q2, q3) is obtained (step S3102). When the block P including the pixel p is the intra-picture PCM block (YES in step S3103), no quantization is performed and no coding is deteriorated, so the quantization parameter QPP is set to 0 (step S3104). Similarly, when the block Q including the pixel q is the intra-picture PCM block (YES in step S3105), no quantization is performed and no coding is deteriorated, so the quantization parameter QPQ is set to 0 (step S3106). In addition, when there is a block P When the coding block of the block Q is an intra-picture PCM block, in steps S3104 and S3106, although the quantization parameters QPP and QPQ of the PCM block in the picture are set to 0, in particular, the syntax will be described later. When the values of the elements beta_offset_div2 and tc_offset_div2 are relatively wide, the quantization parameters QPP and QPQ of the PCM block in the picture are not set to 0, and are instead set to the minimum value of the quantization parameter QY, that is, -QpBdOffsetY. The values of the variable β and the variable tc to be described later become small. At this time, by reducing the filter strength involved in the PCM block in the picture without deterioration of the picture quality, the filter strength of the deblocking filter can be set more appropriately. Then, the average value of the quantization parameter QPP and the quantization parameter QPQ is derived as the QPA by the following equation (step S3107). QPA=(QPP+QPQ+1)>>1

Next, the variable β is derived (step S3108). The variable β is the variable used when the strength of the deblocking filter is determined. The larger the average QPA of the quantization parameters, the larger the value of the variable β becomes. In the derivation of the variable β, the index indexB is derived by the following equation. If the index indexB is less than 0, it is set to 0. If it is greater than 51, the limit is 51. By referring to the table of Fig. 16, the variable β is derived. indexB=QPA+(beta_offset_div2<<1) where beta_offset_div2 is the syntax encoded in sequence units Element with a value from -13 to 13. When the coding block containing the block P or the block Q is an intra-picture PCM block, the value of the average value QPA of the quantization parameter is set by setting the quantization parameter QPP or QPQ of the PCM block in the picture to -QpBdOffsetY or 0. Will become smaller, the value of β will become smaller. When the value of β is small, as will be described later, it is easy to change the filter, and it is easy to select a weak filter.

Next, the variable tc is derived (step S3109). The value of the variable tc is a variable used when the strength of the deblocking filter is determined. The larger the value QPA of the quantization parameter or the value of the variable bS indicating the boundary strength, the larger the value of the variable tc. In the derivation of the variable tc, the index indexTc is derived by the following equation. If the index indexTc is less than 0, it is set to 0. If it is greater than 53, the limit is 53. The variable tc is derived by referring to the table of FIG. indexTc=QPA+2 * (bS-1)+(tc_offset_div2<<1) where tc_offset_div2 is a syntax encoded in sequence units with a value of -13 to 13.

Next, the evaluation value d is derived based on the relationship of the pixel values in the vicinity of the boundary (step S3110). When the evaluation value d is equal to or greater than the variable β (NO in step S3111), the input pixel is directly regarded as an output pixel (step S3116), and the filtering processing of the luminance signal is ended. If the value of the variable β is small, it is easy to become a filter.

If the evaluation value d is smaller than the variable β (YES in step S3111), the de-arrangement is determined based on the relationship between the pixel value in the vicinity of the boundary and the variable β. The type of the block filter (step S3112). In the present embodiment, two types of filters, a strong filter and a weak filter, are used for switching. If the value of the variable β is large, it is easy to select a strong filter, and if the value of the variable β is small, it is easy to select a weak filter.

Next, the signal is filtered for each line of the filtering block (steps S3113 to S3115). The filtering of the pixels p (pixels p0, p1, p2, p3) and the pixels q (pixels q0, q1, q2, q3) at the boundary of the block of each line signal is performed (step S3114).

Fig. 18 is a flow chart showing the filtering processing procedure for each line signal of step S3114 of the first embodiment. If a strong filter is applied (YES in step S3201), a strong filter is applied (step S3202). If not (NO in step S3201), a weak filter is applied (step S3203). The pixel p' (pixels p0', p1', p2', p3') and pixel q' (pixels q0', q1', q2', q3') to which the filter is applied are regarded as output pixels, and the filtering is ended. Processing program.

Next, a second embodiment will be described. 10, FIG. 11, FIG. 14, FIG. 19, and FIG. 20 are flowcharts for explaining the processing procedure of the second embodiment of the deblocking filter unit 111 of the video encoding apparatus and the deblocking filter unit 211 of the video decoding apparatus. Figure. In the first embodiment, FIG. 10, FIG. 11, and FIG. 14 are the same, FIG. 15 is changed to FIG. 19, and FIG. 18 is changed to FIG. The same number is assigned to the same process (step). FIG. 19 of the second embodiment is the determination of whether the block blocks of the block P and the block Q in the steps S3103 to S3106 of FIG. 15 of the first embodiment are intra-picture PCM blocks, and if it is intra-screen PCM. Then the process of setting the quantization parameter QPP or QPQ to 0 is Omitted, this is different. Fig. 20 of the second embodiment differs from Fig. 18 of the first embodiment in that the processing of steps S3205 to S3208 is added.

Fig. 19 is a flowchart showing a filter processing procedure of the block edge in step S2302 of the second embodiment. First, the quantization parameter QPP of the block P including the pixel p is obtained (step S3101). The quantization parameter QPQ of the block Q including the pixel q is obtained (step S3102). The processing in and after step S3107 in Fig. 19 is the same as that in Fig. 15 of the first embodiment, and thus the description thereof is omitted.

Fig. 20 is a flowchart showing a filtering processing procedure of the luminance signal for each line of step S3114 of the second embodiment. If a strong filter is applied (YES in step S3201), a strong filter is applied (step S3202). If not (NO in step S3201), a weak filter is applied (step S3203). The pixels p', q' to which the filter has been applied are treated as output pixels.

When the block P including the pixel p is the intra-picture PCM block (YES in step S3205), the pixel value of the input image p is set to the output pixel p' (step S3206). That is, in a state where a filter is not applied to the pixel p of the PCM block in the picture, it is directly output as an output pixel. When the block containing the pixel p is not the intra-picture PCM block (YES in step S3205), the pixel p' to which the filter has been applied is directly regarded as the output pixel, and the process proceeds to step S3207.

When the block containing the pixel q is the PCM block in the picture (YES in step S3207), the pixel value of the input image q is set to the output pixel q' (step S3208). That is, in a state where a filter is not applied to the pixel q of the PCM block in the picture, it is directly regarded as an output pixel. To output. When the block containing the pixel q is not the intra-picture PCM block (YES in step S3207), the pixel q' to which the filter has been applied is directly regarded as the output pixel, and the filtering processing routine is ended.

In the first embodiment, if either of the block P or the block Q is the intra-picture PCM, the quantization parameter of the PCM block in the picture is set to 0 or the minimum value of the quantization parameter to calculate the value of the variable β. In the other block of the PCM in the non-screen, the value of the variable β is also small, and the filter is not applied, so that it is easy to select the weak filter, and the deblocking filter cannot be applied appropriately. . For example, in FIG. 9(a) or (b), the bit depth of the luminance signal is 8 bits, and the block P is intra-picture PCM coding and the quantization parameter QPP has a value of 30, and the block Q is intra-picture prediction. The mode and the encoding parameter QPQ have a value of 30. When the value of the syntax element beta_offset_div2 is 0, the value of the quantization parameter QPP is set to 0, the value of the encoding parameter QPA becomes 15, and the value of the variable β becomes 0. At this time, not only the block P but also the block Q does not apply a filter, and block distortion cannot be removed.

On the other hand, in the second embodiment, it is not necessary to distinguish whether or not the intra-picture PCM is used, but the quantization parameter is used, so that a filter having a suitable intensity can be applied. For example, in FIG. 9(a) or (b), the bit depth of the luminance signal is 8 bits, and the block P is intra-picture PCM coding and the coding parameter QPP has a value of 30, and the block Q is intra-picture prediction. When the mode and encoding parameter QPQ has a value of 30 and the syntax element beta_offset_div2 has a value of 0, the value of the encoding parameter QPA becomes 30, and the value of the variable β becomes 22. At this time, a suitable filter is applied to the block Q to remove block distortion. also Regarding the intra-picture PCM block without coding degradation, no filter is always applied, so that encoding degradation does not occur with respect to the intra-picture PCM block.

Next, a third embodiment will be described. 10, FIG. 11, FIG. 14, FIG. 19, and FIG. 21 are flowcharts for explaining the processing procedure of the third embodiment of the deblocking filter unit 111 of the video encoding apparatus and the deblocking filter unit 211 of the video decoding apparatus. Figure. In the second embodiment, FIG. 10, FIG. 11, FIG. 14, and FIG. 19 are the same, and FIG. 20 is changed to FIG. The same number is assigned to the same process (step). Fig. 21 of the second embodiment differs from Fig. 20 of the second embodiment in that the processing of step S3204 is added. The processing of Figs. 10, 11, 14, and 19 is the same as that of the second embodiment, and thus the description thereof is omitted.

Fig. 21 is a flowchart showing a filtering processing procedure of the luminance signal for each line of step S3114 of the third embodiment. If a strong filter is applied (YES in step S3201), a strong filter is applied (step S3202). If not (NO in step S3201), a weak filter is applied (step S3203).

Next, the value of the flag pcm_loop_filter_disable_flag is determined (step S3204). The pcm_loop_filter_disable_flag is a flag for indicating whether or not to apply a deblocking filter or other loop filter to pixels encoded in the intra-picture PCM, and is set and encoded in a sequence, an image, or a slice unit. If pcm_loop_filter_disable_flag is 1 (YES in step S3204), the process proceeds to step S3205, and if pcm_loop_filter_disable_flag is 0 (NO in step S3204), pixels p' and q' to which the filter has been applied are regarded as output pixels, and the process ends. This filter processing program.

When the block containing the pixel p is the PCM block in the picture (YES in step S3205), the pixel value of the input image p is set to the output pixel p' (step S3206). That is, in a state where a filter is not applied to the pixel p of the PCM block in the picture, it is directly output as an output pixel. When the block containing the pixel p is not the intra-picture PCM block (YES in step S3205), the pixel p' to which the filter has been applied is directly regarded as the output pixel, and the process proceeds to step S3207.

When the block containing the pixel q is the PCM block in the picture (YES in step S3207), the pixel value of the input image q is set to the output pixel q' (step S3208). That is, in a state where a filter is not applied to the pixel q of the PCM block in the picture, it is directly output as an output pixel. When the block containing the pixel q is not the intra-picture PCM block (YES in step S3207), the pixel q' to which the filter has been applied is directly regarded as the output pixel, and the filtering processing routine is ended.

In the third embodiment, since the deblocking filter can be applied to the pixels encoded with the intra-picture PCM according to the flag pcm_loop_filter_disable_flag, the flag pcm_loop_filter_disable_flag is set to 0, especially at a high bit rate. Then, it is possible to omit whether or not the block is a PCM in the picture, and the amount of calculation can be reduced.

Further, in the first embodiment, the filtering processing program for each line signal of Fig. 18 may be omitted, and the filtering processing program for each line signal of Fig. 21 described in the third embodiment may be modified. Due to the flag Pcm_loop_filter_disable_flag to switch whether to apply a deblocking filter to pixels encoded in the intra-picture PCM, so especially when the bit rate is low, the flag pcm_loop_filter_disable_flag is set to 1, and no deblocking filter is applied to the intra-picture PCM block. Thereby, deterioration of image quality can be suppressed.

The coded bitstream of the video output by the video encoding apparatus according to the above embodiment has a specific data format for decoding in accordance with the encoding method used in the embodiment, and corresponds to the video encoding apparatus. The video decoding device can decode the encoded bit sequence of this particular data format.

In the case where a video or wireless network is used between the video encoding device and the video decoding device to receive the encoded bit sequence, the encoded bit sequence can be converted into a data format suitable for the transmission mode of the communication path for transmission. In this case, there is provided an image transmitting device that converts the encoded bit sequence output by the image encoding device into a packetized encoded stream suitable for the data format of the communication path and then transmits the encoded encoded stream to the network. And a video receiving device that receives the encoded encoded stream from the network and restores the encoded bit sequence to the video decoding device.

The image transmitting device includes: a memory for buffering a coded bit column output by the video encoding device, a packet processing unit for packetizing the encoded bit column, and a packetized encoded stream through the network The transmitting unit that performs the transmission. The video receiving device includes a receiving unit that receives the encoded encoded stream through the network, and a memory that buffers the received encoded data, and encapsulates the encoded data. The packet processing unit that generates the encoded stream and supplies it to the video decoding device is generated.

The above processing for encoding and decoding can be implemented by means of hardware, transmission, accumulation, and receiving device. Of course, it can also be stored in ROM (read only memory) or flash memory. The firmware, or software such as a computer, is implemented. The firmware program and software program can also be recorded on a readable recording medium such as a computer, or can be provided from a server through a wired or wireless network, or can be broadcast by means of a surface wave or satellite digital broadcast. Come and provide it.

The present invention has been described above based on the embodiments. The embodiments are exemplified, and there are various possible modifications in the combinations of these constituent elements or processing programs, and these modifications are also within the scope of the invention and can be understood by the practitioner.

[Possibility of industrial use]

The invention can be utilized to utilize filtered image encoding and decoding techniques.

101‧‧‧Image memory

102‧‧‧Quantity Parameter Determination Department

103‧‧‧Intra-frame prediction department

104‧‧‧PCM coding department

105‧‧‧Inter-picture prediction department

106‧‧‧Code Method Determination Department

107‧‧‧Residual Signal Generation Department

108‧‧‧Orthogonal Conversion ‧Quantity Department

109‧‧‧ inverse quantization ‧ inverse orthogonal transformation

110‧‧‧Decoded image signal overlap

111‧‧‧Deblocking Filter Section

112‧‧‧ Coded information storage memory

113‧‧‧1st decoded image memory

114‧‧‧2nd decoded image memory

115‧‧‧1st coded bit column generation unit

116‧‧‧2nd coded bit column generation unit

117‧‧‧3rd coded bit column generation unit

118‧‧‧Coded bit column

119‧‧‧ switch

Claims (30)

An image encoding device is a video encoding device for encoding a video signal including a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter determining unit is configured to set a quantization parameter of the block; And the first coding unit quantizes, compresses, and encodes the video signal of the block based on the pre-quantified quantization parameter; and the second coding unit performs uncompressed coding on the video signal of the block; and deblocking filtering The device uses the quantization parameter values set by the blocks on both sides of the block boundary to derive the filter strength, and performs filtering processing on the blocks on both sides of the boundary of the preceding block; In the block that is previously uncompressed, the input signal before the pre-filtering process is directly used as the output signal. The video encoding apparatus according to claim 1, wherein the pre-deblocking filter unit is based on a flag for indicating whether or not the block to be uncompressed by the pre-recording is invalidated by the filter processing. When the flag indicates that it is not set to be invalid, the input signal after the implementation of the pre-filtering process is output, and when the current flag indicates that it is to be invalid, the pre-recording filter is implemented on the block which is previously uncompressed. The input signal before processing is directly used as the output signal. The image coding apparatus according to claim 1 or 2, wherein the pre-deblocking filter unit uses the average of the quantized parameter values before the blocks on both sides of the boundary of the preceding block are set. The value is used to derive the pre-filter strength. An image encoding device is a video encoding device for encoding a video signal including a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter determining unit is configured to set a quantization parameter of the block; And the first coding unit quantizes, compresses, and encodes the video signal of the block based on the pre-quantified quantization parameter; and the second coding unit performs uncompressed coding on the video signal of the block; and deblocking filtering The device uses the quantization parameter values set by the blocks on both sides of the block boundary to determine the filter strength, and performs filtering processing on the blocks on both sides of the boundary of the preceding block; If the pre-record block is a block that is not compression-coded, the input signal before filtering is directly used as an output signal. An image encoding method belongs to an image encoding method for encoding an image signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter determining step is performed, and the quantization parameter of the block is set. And the first encoding step, the image signal of the block is quantized, compressed and encoded based on the pre-quantified quantization parameter; and the second encoding step is to uncompress the image signal of the block; The block filtering step is to use the quantization parameter values set by the blocks on both sides of the block boundary to derive the filter strength, and perform filtering processing on the blocks on both sides of the boundary of the preceding block; In the block that is previously uncompressed, the input signal before the pre-filtering process is directly used as the output signal. The image encoding method according to claim 5, wherein the pre-deblocking filtering step is based on a flag used to indicate whether the block to which the pre-recorded non-compressed code is set to invalidate the filter processing, current record When the flag indicates that it is not invalid, the input signal after the pre-filtering process is output on the block which is pre-compressed by the pre-recording. When the current flag indicates that it is set to be invalid, the pre-filtering process is implemented. The previous input signal is directly used as the output signal. The image encoding method according to Item 5 or Item 6 of the patent application, wherein the pre-deblocking filtering step uses an average value of the quantized parameter values before the blocks on both sides of the boundary of the preceding block are set. To derive the pre-filter strength. An image encoding method belongs to an image encoding method for encoding an image signal containing a luminance signal and a color difference signal in a block unit. The method includes: a quantization parameter determining step of setting a quantization parameter of the block; and a first encoding step of quantizing, compressing, and encoding the image signal of the block based on the pre-quantified parameter; 2 encoding step, the image signal of the block is uncompressed and encoded; and the deblocking filtering step is to determine the filtering strength by using the quantized parameter values set by the blocks on both sides of the block boundary. The blocks on both sides of the boundary of the preceding block are subjected to filtering processing; the pre-blocking filtering step is to directly convert the input signal before filtering into an output signal if the preceding block is a block that performs non-compression coding. An image encoding program is an image encoding program for encoding a video signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that the computer performs: a quantization parameter determining step, and the quantization parameter of the block is given And the first encoding step, the image signal of the block is quantized, compressed and encoded based on the pre-quantified quantization parameter; and the second encoding step is to uncompress the image signal of the block; Block filtering step, using blocks on both sides of the block boundary The filter strength is derived from the set quantization parameter values, and the filtering processing is performed on the blocks on both sides of the boundary of the preceding block; the pre-blocking filtering step is performed on the block which is previously uncompressed and encoded, and the pre-record is implemented. The input signal before the filtering process is directly used as the output signal. The image coding program according to claim 9 , wherein the pre-deblocking filtering step is based on a flag used to indicate whether the block to be uncompressed by the pre-recording is invalidated, and the current record is When the flag indicates that it is not invalid, the input signal after the pre-filtering process is output on the block which is pre-compressed by the pre-recording. When the current flag indicates that it is set to be invalid, the pre-filtering process is implemented. The previous input signal is directly used as the output signal. For example, the image coding program described in claim 9 or 10, wherein the pre-blocking filtering step uses the average value of the quantized parameter values before the blocks on both sides of the boundary of the preceding block are set. To derive the pre-filter strength. An image encoding program is an image encoding program for encoding a video signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that the computer performs: a quantization parameter determining step, and the quantization parameter of the block is given And the first encoding step of quantizing, compressing, and encoding the image signal of the block based on the pre-quantitative parameter; The second encoding step is to perform uncompressed encoding on the image signal of the block; and the deblocking filtering step is to determine the filtering strength by using the quantization parameter values respectively set by the blocks on both sides of the block boundary. The filtering process is performed on the blocks on both sides of the boundary of the pre-record block; the pre-blocking filtering step is that if the pre-record block is a block that performs non-compression coding, the input signal before filtering is directly regarded as an output signal. A transmitting device, comprising: a packet processing unit that encapsulates a coded bitstream to obtain a coded stream, the coded bitstream comprising a luminance signal and a color difference signal by a block unit The video signal encoding method for encoding the video signal is encoded; and the transmitting unit transmits the encoded stream before being packetized; the pre-recording image encoding method includes: a quantization parameter determining step, which is to block The quantization parameter is set; and the first encoding step quantizes, compresses, and encodes the image signal of the block based on the pre-quantified quantization parameter; and the second encoding step performs uncompressing the image signal of the block The coding and deblocking filtering steps are performed by using the quantized parameter values respectively set by the blocks on both sides of the block boundary to derive the filtering strength, and the pre-recorded block is handed over. The blocks on both sides of the boundary are subjected to filtering processing; the pre-blocking filtering step is performed on the block which is previously uncompressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal. A method for transmitting a packet, comprising: a packet processing step of packetizing a coded bitstream to obtain a coded stream stream, wherein the coded bitstream column comprises a luminance signal and a color difference signal by using a block unit The image signal encoding method is encoded by the image encoding method; and the sending step is to encode the stream before being encapsulated and sent; the pre-recording image encoding method includes: a quantization parameter determining step, which is to block The quantization parameter is set; and the first encoding step quantizes, compresses, and encodes the image signal of the block based on the pre-quantified quantization parameter; and the second encoding step performs uncompressing the image signal of the block The coding and deblocking filtering steps are performed by using the quantization parameter values respectively set by the blocks on both sides of the block boundary to derive the filtering strength, and performing filtering processing on the blocks on both sides of the boundary of the preceding block; The deblocking filtering step is performed on the block which is previously uncompressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal. number. A transmitting program, characterized in that the computer performs: a packet processing step of packetizing a coded bit column to obtain a coded stream, the coded bit string comprising luminance signals and color differences by using a block unit The image signal of the signal is encoded by the image encoding method; and the sending step is to encode the stream before being encapsulated and sent; the pre-image encoding method includes: a quantization parameter determining step, The quantization parameter of the block is set; and the first coding step is to quantize, compress and encode the image signal of the block based on the pre-quantization parameter; and the second coding step is to perform the image signal of the block. The non-compressed coding; and the deblocking filtering step are performed by using the quantization parameter values respectively set by the blocks on both sides of the block boundary to derive the filtering strength, and performing filtering processing on the blocks on both sides of the boundary of the preceding block. The pre-blocking filtering step is performed on the block which is previously uncompressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal. An image decoding device belongs to a video decoding device for decoding an image signal containing a luminance signal and a color difference signal in a block unit, The method further includes: a quantization parameter deriving unit that derives a quantization parameter of the block; and a first decoding unit that inversely quantizes the video signal of the block that has been compression-coded based on the pre-determined quantization parameter. Decoding; and the second decoding unit decodes the video signal of the block that has been uncompressed, and the deblocking filter unit uses the quantization of each of the blocks on both sides of the block boundary The parameter value is used to derive the filtering strength, and the decoded image signal of the block on both sides of the boundary of the preceding block is subjected to filtering processing; the pre-blocking filter unit is decoded before the pre-recorded block of the non-compressed coded block On the image signal, the input signal before the pre-filtering process is implemented as an output signal. The video decoding device according to claim 16, wherein the pre-deblocking filter unit is based on a flag for indicating whether or not the block to which the pre-recorded non-compressed coding is to invalidate the filter processing. When the flag indicates that it is not set to be invalid, the input signal after the pre-filtering process is executed is output, and when the current flag indicates that it is to be invalid, the pre-recorded decoded video signal of the block that is not compressed and encoded is pre-recorded. In the above, the input signal before the pre-filtering process is directly used as the output signal. The image decoding device according to claim 16 or 17, wherein the pre-deblocking filter unit uses an average of the quantized parameter values before the blocks on both sides of the boundary of the preceding block are set. value To derive the pre-filter strength. A video decoding device is a video decoding device for decoding an image signal including a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter deriving unit is configured to derive a quantization parameter of the block; And the first decoding unit performs inverse quantization and decoding on the video signal of the block that has been compression-coded based on the pre-quantization parameter; and the second decoding unit is an image signal of the block that has been non-compressed. Decoding; and the deblocking filter unit uses the quantization parameter values set by the blocks on both sides of the block boundary to determine the filtering strength, and decodes the blocks on both sides of the boundary of the preamble block. The image signal is subjected to filtering processing; if the pre-blocking block is a block that has been non-compressed, the input signal before filtering is directly regarded as an output signal. An image decoding method belongs to a video decoding method for decoding an image signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter deriving step is performed, and the quantization parameter of the block is derived; And the first decoding step of performing inverse quantization and decoding on the image signal of the block that has been compression-coded based on the pre-recorded quantization parameter; and The second decoding step is to decode the video signal of the block that has been uncompressed, and the deblocking filtering step is to use the quantization parameter values set by the blocks on both sides of the block boundary. Deriving the filtering strength, performing filtering processing on the decoded image signals of the blocks on both sides of the boundary of the preceding block; the pre-blocking filtering step is performed on the pre-recorded decoded video signal of the block which is previously uncompressed. The input signal before the pre-filtering process is implemented directly as an output signal. The image decoding method according to claim 20, wherein the pre-deblocking filtering step is based on a flag used to indicate whether or not the block that is pre-compressed is uncompressed is set to be invalid. When the flag indicates that it is not set to be invalid, the input signal after the pre-filtering process is implemented is output, and when the current flag indicates that it is to be invalid, it is preceded by the pre-recorded decoded video signal of the block that is not compressed and encoded. The input signal before the pre-filtering process is implemented as an output signal. The image decoding method according to claim 20 or claim 21, wherein the pre-deblocking filtering step uses an average value of the quantized parameter values before the blocks on both sides of the boundary of the preceding block are set. To derive the pre-filter strength. An image decoding method belongs to a video decoding method for decoding an image signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that: a quantization parameter deriving step is performed, and the quantization parameter of the block is guided. And the first decoding step of inversely quantizing and decoding the video signal of the block that has been compression-coded based on the pre-quantized quantization parameter; and the second decoding step, the image of the block that has been non-compressed encoded The signal is decoded; and the deblocking filtering step is to determine the filtering strength by using the quantized parameter values set by the blocks on both sides of the block boundary, and the blocks on both sides of the boundary of the preceding block are determined. The decoding image signal is subjected to filtering processing; the pre-blocking filtering step is performed by directly converting the input signal before filtering into an output signal if the pre-recording block is a block that has been non-compressed. An image decoding program belongs to a video decoding program for decoding a video signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that the computer performs: a quantization parameter deriving step, and the quantization parameter of the block is given Deriving; and the first decoding step of inversely quantizing and decoding the video signal of the block that has been compression-coded based on the pre-quantized quantization parameter; and the second decoding step of the image of the block that has been non-compressed encoded The signal is decoded; and the deblocking filtering step is to use the quantization parameter values set by the blocks on both sides of the block boundary to derive the filtering strength, and the blocks on both sides of the boundary of the preceding block are already The decoded image signal is subjected to filtering processing; the pre-deblocking filtering step is performed on the block which is previously uncompressed and encoded. The pre-recorded image signal is decoded, and the input signal before the pre-filtering process is directly used as the output signal. The image decoding program according to claim 24, wherein the pre-deblocking filtering step is based on a flag used to indicate whether the block to which the pre-recorded non-compressed code is set to invalidate the filter processing, current record When the flag indicates that it is not set to be invalid, the input signal after the pre-filtering process is implemented is output, and when the current flag indicates that it is to be invalid, it is preceded by the pre-recorded decoded video signal of the block that is not compressed and encoded. The input signal before the pre-filtering process is implemented as an output signal. For example, in the image decoding program described in claim 24 or 25, wherein the pre-deblocking filtering step uses the average value of the quantized parameter values before the blocks on both sides of the pre-block boundary are set. To derive the pre-filter strength. An image decoding program belongs to a video decoding program for decoding a video signal containing a luminance signal and a color difference signal in a block unit, and is characterized in that the computer performs: a quantization parameter deriving step, and the quantization parameter of the block is given Deriving; and the first decoding step of inversely quantizing and decoding the video signal of the block that has been compression-coded based on the pre-quantized quantization parameter; and the second decoding step of the image of the block that has been non-compressed encoded Signal, to be decoded; and deblocking filtering step, using blocks on both sides of the block boundary Determining the filter strength from the set quantization parameter values, and performing filtering processing on the decoded image signals of the blocks on both sides of the pre-block boundary; the pre-blocking filtering step is if the pre-block is non-compressed coding For the block, the input signal before filtering is directly used as the output signal. A receiving device belongs to a receiving device that receives and decodes a coded bit sequence encoded by an image, and is characterized in that it comprises: a receiving unit that receives a coded stream, and the coded stream is received The image signal containing the luminance signal and the color difference signal is encapsulated by the coded bit column encoded by the block unit; and the restoring unit performs the packet processing on the received pre-coded stream. To restore the original coded bit sequence; and the quantization parameter deriving unit to derive the quantization parameter of the block; and the first decoding unit to record the original encoded bit sequence from the restored The video signal of the compressed coded block is inverse quantized and decoded based on the pre-recorded quantization parameter; and the second decoding unit decodes the original uncoded area from the original encoded bit sequence before being restored. The image signal of the block; and the deblocking filter unit, which uses the quantization parameter values set by the blocks on both sides of the block boundary to derive the filter strength, and the blocks on both sides of the boundary of the preamble block Has Code filter processing image signals; referred to before deblocking filter unit, referred to before the front line is referred to non-compressed encoded blocks on the decoded image signal, the input before the former embodiment referred filtering The signal is directly used as an output signal. A receiving method belongs to a receiving method for receiving and decoding a coded bit sequence encoded by an image, characterized in that it comprises: a receiving step of receiving a coded stream, the encoded stream system The image signal containing the luminance signal and the color difference signal is encapsulated by the coded bit column encoded by the block unit; and the restoration step is to packetize the received pre-coded stream. To restore the original coded bit column; and the quantization parameter deriving step, which is to derive the quantization parameter of the block; and the first decoding step, which is the original coded bit column before being restored, The image signal of the compressed coded block is inverse quantized and decoded based on the pre-recorded quantization parameter; and the second decoding step is to decode the original uncoded region from the original encoded bit sequence before being restored. The block image signal; and the deblocking filtering step are performed by using the quantized parameter values set by the blocks on both sides of the block boundary to derive the filter strength, and the two sides of the boundary of the pre-record block The decoded image signal of the block is subjected to filtering processing; the pre-blocking filtering step is performed on the pre-recorded decoded video signal of the block which is not compressed and encoded, and the input signal before the pre-filtering process is directly used as the output signal. . A receiving program is a receiving program that receives and decodes a coded bit sequence encoded by an image, and is characterized in that The computer executes: the trusted step is to receive the encoded stream, wherein the encoded signal containing the luminance signal and the color difference signal is encapsulated by the encoded bit column encoded by the block unit. And the restoring step is to perform packet processing on the received pre-coded stream to recover the original encoded bit sequence; and the quantization parameter deriving step is to derive the quantization parameter of the block; 1 decoding step, which is to inversely quantize and decode the video signal of the block that has been compression-coded based on the original quantized parameter from the original coded bit column before being restored; and the second decoding step is Before being restored, the original coded bit column is decoded to decode the image signal of the block that has been uncompressed, and the deblocking filtering step is to use the quantization parameter set by each block on both sides of the block boundary. Value, to derive the filter strength, perform filtering processing on the decoded image signals of the blocks on both sides of the pre-block boundary; the pre-blocking filtering step is in the area of the uncompressed coding. Remember the previous decoded video signal, the input signal prior to the previous embodiments in mind the filtering process, as a direct output signal.