WO2015008417A1 - 映像符号化装置、映像復号装置、映像符号化方法、映像復号方法及びプログラム - Google Patents
映像符号化装置、映像復号装置、映像符号化方法、映像復号方法及びプログラム Download PDFInfo
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
Definitions
- the present invention relates to a highly efficient in-screen prediction technique for color difference signals.
- each frame of the digitized video is divided into coding tree units (CTU: Coding Tree Unit), and each CTU is encoded in raster scan order. It becomes.
- CTU is divided into coding units (CU: Coding Unit) in a quad tree structure and encoded.
- CU Coding Unit
- Each CU is predicted by being divided into prediction units (PU: Prediction Unit).
- PU Prediction Unit
- the prediction error of each CU is divided into transform units (TU: Transform Unit) in a quadtree structure, and is subjected to frequency conversion.
- CU is a coding unit for intra prediction / interframe prediction.
- intra prediction and inter-frame prediction will be described.
- Intra prediction is prediction in which a prediction signal is generated from a reconstructed image of an encoding target frame.
- Non-Patent Document 1 defines 33 types of angle intra prediction shown in FIG. In the angle intra prediction, an intra prediction signal is generated by extrapolating the reconstructed pixels around the encoding target block in any of the 33 types of directions shown in FIG.
- DC prediction and Planar prediction are defined as intra prediction.
- DC prediction the average value of the reference image is used as the prediction value for all pixels of the prediction target TU.
- Planar prediction a predicted image is generated by linear interpolation from pixels in a reference image.
- Inter-frame prediction is prediction based on an image of a reconstructed frame (reference picture) having a display time different from that of the encoding target frame. Inter-frame prediction is also called inter prediction. In inter prediction, an inter prediction signal is generated based on a reconstructed image block of a reference picture (using pixel interpolation if necessary).
- a video encoding device 100A shown in FIG. 15 includes a frequency converter 101, a quantizer 102, an entropy encoder 103, an inverse frequency transformer / inverse quantizer 104, a buffer 105, an intra predictor 1060, an inter predictor 107, and A switch 110 is provided.
- the intra predictor 1060 and the inter predictor 107 generate a prediction signal for the input image signal of the CU.
- the intra predictor 1060 generates a prediction signal based on the intra prediction.
- the inter predictor 107 generates a prediction signal based on the inter prediction.
- the image input to the video encoding device 100A is input to the frequency converter 101 as a prediction error image after the prediction image supplied from the intra predictor 1060 or the inter predictor 107 is subtracted via the switch 110. .
- the frequency converter 101 performs frequency conversion on the prediction error image obtained by subtracting the prediction signal from the input image signal.
- the quantizer 102 quantizes the frequency-converted prediction error image (coefficient image).
- the entropy encoder 103 performs entropy encoding on the prediction parameter and the coefficient image, and outputs a bit stream.
- the inverse frequency transform / inverse quantizer 104 inversely quantizes the coefficient image. Further, the inverse frequency transform / inverse quantizer 104 performs inverse frequency transform on the inversely quantized coefficient image.
- the reconstructed prediction error image subjected to the inverse frequency conversion is supplied with a prediction signal and supplied to the buffer 105.
- the buffer 105 stores the reconstructed image.
- FIG. 16 is a block diagram illustrating an example of a configuration of a general video decoding apparatus that decodes a bitstream output from a general video encoding apparatus and obtains decoded video. The configuration and operation of a general video decoding device will be described with reference to FIG.
- 16 includes an entropy decoder 203, an inverse frequency transform / inverse quantizer 204, a buffer 205, an intra predictor 2060, an inter predictor 207, and a switch 210.
- the entropy decoder 203 performs entropy decoding on the input bit stream.
- the entropy decoder 203 supplies the quantized coefficient image to the inverse frequency transform / inverse quantizer 204, and supplies the prediction parameter to the switch 210.
- the inverse frequency transform / inverse quantizer 204 dequantizes the input quantized coefficient image and outputs it as a coefficient image. Further, the inverse frequency transform / inverse quantizer 204 transforms the coefficient image from the frequency domain to the spatial domain and outputs it as a prediction error image. The prediction error image is added to the prediction image supplied from the switch 210 and becomes a decoded image. The decoded image is output as an output image from the video decoding device 200A, and is input to the buffer 205 and the intra predictor 2060.
- the buffer 205 stores previously decoded images as reference images.
- the intra predictor 2060 predicts an image to be decoded from an adjacent reconstructed image decoded in the past in the image currently being decoded, and generates a predicted image.
- the inter predictor 207 generates a prediction image based on the reference image supplied from the buffer 205.
- luminance component luminance signal
- color difference component color difference signal
- the CTU is composed of a luminance component coding block (CTB: Coding Tree Brock) and a corresponding color difference component CTB.
- CTB luminance component coding block
- CTB Color difference component coding block
- the resolutions of the luminance component and the color difference component are defined as 4: 2: 0, 4: 2: 2, and 4: 4: 4 as shown in FIG.
- N indicates the number of pixels.
- the number of pixels of the U component and the V component of the color difference signal is 1 ⁇ 2 of the number of pixels of the luminance component Y in the horizontal direction and the vertical direction.
- the number of pixels of the U component and the V component of the color difference signal is 1 ⁇ 2 of the number of pixels of the luminance component Y in the horizontal direction.
- the number of pixels of the U component and the V component of the color difference signal is the same as the number of pixels of the luminance component Y in the horizontal direction and the vertical direction.
- the prediction mode (prediction direction) of the U component is the same as the prediction mode of the V component in intra prediction.
- the video encoding apparatus can signal whether or not the prediction mode of the color difference component is the same as the prediction mode of the upper left luminance PU in the CU. That is, the video encoding apparatus can predictively encode the color difference component based on the luminance component intra prediction mode. When the luminance component prediction mode and the color difference component prediction mode are not the same, the video encoding apparatus can apply a predetermined prediction mode to the luminance component.
- JCT-VC Joint Collaborative Team on Video Coding
- the prediction direction (gradient) of the U component and the prediction direction of the V component are the same, there is a problem that intra prediction suitable for each of the U component and the V component cannot be performed.
- the prediction mode suitable for the U component is not always suitable for the V component. Therefore, there is a problem that the encoding efficiency of the video signal is lowered. For example, when the prediction mode is not suitable for the V component, the code amount of the V component increases. This problem becomes more prominent at 4: 2: 2 and 4: 4: 4 where the number of pixels of the color difference component increases.
- An object of the present invention is to provide a video encoding device, a video decoding device, a video encoding method, a video decoding method, and a program capable of increasing the encoding efficiency of color difference components.
- the video encoding device encodes an intra prediction unit that predicts a processing target block based on an adjacent reconstructed image, and an intra prediction mode of a first color difference component based on an intra prediction mode of a luminance component.
- the video decoding apparatus decodes the intra-prediction means for predicting the decoding target block based on the adjacent reconstructed image, and the intra-prediction mode of the first color difference component based on the intra-prediction mode of the luminance component.
- a video encoding method is a video encoding method executed by a video encoding device including intra prediction means for predicting a processing target block based on an adjacent reconstructed image, and includes intra prediction of luminance components.
- the first color difference component intra prediction mode is encoded based on the mode, and the second color difference component intra prediction mode is encoded according to the first color difference component intra prediction mode.
- a video decoding method is a video decoding method executed by a video decoding device including an intra prediction unit that predicts a decoding target block based on an adjacent reconstructed image, and is based on an intra prediction mode of a luminance component.
- the first color difference component intra prediction mode is decoded, and the second color difference component intra prediction mode is decoded according to the first color difference component intra prediction mode.
- a video encoding program includes a computer having intra prediction means for predicting a processing target block based on an adjacent reconstructed image, and a first color difference component intra prediction mode based on a luminance component intra prediction mode. , And the second color difference component intra prediction mode is encoded according to the first color difference component intra prediction mode.
- the video decoding program provides a computer having intra prediction means for predicting a decoding target block based on an adjacent reconstructed image, and sets the first color difference component intra prediction mode based on the luminance component intra prediction mode.
- the second color difference component intra prediction mode is decoded according to the first color difference component intra prediction mode.
- the encoding efficiency of the color difference component can be increased.
- movement of a video decoding apparatus It is a block diagram which shows the example of the information processing system using a program. It is a block diagram which shows the principal part of the video coding apparatus by this invention. It is a block diagram which shows the principal part of the video decoding apparatus by this invention. It is explanatory drawing which shows the example of 33 types of angle intra prediction. It is a block diagram which shows the structure of a general video coding apparatus. It is a block diagram which shows the structure of a general video decoding apparatus. It is explanatory drawing which shows the resolution of a luminance component and a color difference component.
- FIG. FIG. 1 is a block diagram showing a first embodiment of the video encoding device 100. As shown in FIG. With reference to FIG. 1, the configuration of a video encoding device 100 according to the first embodiment that outputs a bit stream using each frame of a digitized video as an input image will be described.
- the video encoding device 100 ⁇ of the present embodiment is similar to the general video encoding device 100 ⁇ / b> A shown in FIG. 15, with a frequency converter 101, a quantizer 102, and an entropy encoder. 103, an inverse frequency transformer / inverse quantizer 104, a buffer 105, an intra predictor 106, an inter predictor 107, and a switch 110.
- the video encoding device 100 ⁇ ⁇ ⁇ further includes an encoding controller 109.
- the intra predictor 106 has a function of performing intra prediction of the V component in a prediction mode different from the prediction mode of the U component.
- the frequency transformer 101, quantizer 102, entropy encoder 103, inverse frequency transformer / inverse quantizer 104, buffer 105, inter predictor 107 and switch 110 are the same as those shown in FIG.
- operations of the intra predictor 106 and the encoding controller 109 will be mainly described.
- Fig. 2 is an explanatory diagram of the color difference component prediction mode.
- 2A shows a prediction mode applied to the color difference component in the video encoding apparatus based on the background art shown in FIG.
- B indicates a prediction mode applied to the color difference component in the present embodiment.
- the prediction mode of the V component is the same as the prediction mode of the U component.
- intra_luma_pred_mode shown in FIG. 2B indicates a prediction mode of the luminance component.
- intra_chroma_pred_mode and intra_second_chroma_pred_mode indicate the prediction mode of the color difference component.
- the prediction mode for the V component is defined separately from the prediction mode for the U component.
- FIG. 3B is an explanatory diagram of the intra prediction mode of the color difference component in the video encoding device according to the present embodiment.
- the prediction mode of the U component may be referred to as a first color difference intra prediction mode
- the prediction mode of the V component may be referred to as a second color difference intra prediction mode.
- the prediction mode of the V component need only be defined independently of the prediction mode of the U component
- the prediction mode of the V component is associated with the first color difference intra prediction mode
- the prediction mode of the U component is the second color difference. It may be associated with the intra prediction mode.
- the second same as the first color difference intra prediction mode in consideration of a tendency that there is a high probability that the intra prediction mode suitable for the U component and the suitable intra prediction mode for the V ⁇ component are the same, the second same as the first color difference intra prediction mode.
- a 1-bit code 0 is assigned to the syntax of the color difference intra prediction mode.
- a 3 bit code is assigned to the second color difference intra prediction mode that is not the same as the first color difference intra prediction mode.
- Intra prediction modes of 0 (DC), 26 (vertical direction), 10 (horizontal direction), 1 (Planar), and 34 (right 45 ° direction) tend to be uniformly distributed.
- a bit ⁇ sign is assigned.
- These intra prediction modes are prediction modes with a relatively high possibility of appearance.
- x indicates other than 0, 26, 10 and 1.
- the 34 prediction modes are prediction modes that have a relatively high possibility of appearance (for example, higher than prediction modes other than 0, 26, 10, and 1).
- any one of the codes 100, 101, 110, and 111 of 3 bit is the first color difference intra prediction mode 0.
- 26, 10, and 1 are assigned according to the syntax.
- the other second color difference intra prediction modes 0, 26, 10, and 1 are assigned any one of 3 bit codes 100, 101, 110, and 111.
- An example in which the prediction mode is used as a second color difference intra prediction mode that is not the same as the first color difference intra prediction mode is shown.
- N is a natural number of 2 or more intra prediction modes as second color difference intra prediction modes that are not identical to the first color difference intra prediction mode. .
- N intra prediction modes with high occurrence frequencies are selected, and a fixed amount of (M + 1) bit (M is the number of bits that can be expressed in binary) is assigned to each. . More specifically, one of the (M + 1) bit codewords is selected for the syntax of the second (N ⁇ 2 M ) second color difference intra prediction mode out of the N selected. Of the N, the allocation is made according to the syntax of the first color difference intra prediction mode that is the same as 2 M intra prediction modes. Also, one of (M + 1) bit codewords is assigned to each syntax of 2 M second color difference intra prediction modes out of the N selected.
- the intra predictor 106 calculates a prediction pixel of the U component for each prediction mode (step S101). That is, the intra predictor 106 searches for a prediction mode.
- the intra predictor 106 ⁇ determines a prediction mode for the U component that minimizes the cost (step S102). If the prediction mode of the luminance component and the prediction mode of the U component are not the same, the encoding controller 109 describes syntax elements relating to the determined prediction mode of the U component (step S103).
- the intra predictor 106 calculates a prediction pixel of the V component for each prediction mode (step S104). That is, the intra predictor 106 searches for a prediction mode. Then, the intra predictor 106 determines the prediction mode of the V component that minimizes the cost (step S105). The encoding controller 109 determines whether or not the prediction mode of the V ⁇ component is the same as the prediction mode of the U component (step S106). If they are the same, the encoding controller 109 ⁇ assigns code 0 ⁇ to the syntax element of the V ⁇ component (step S107).
- the encoding controller 109 can identify the code corresponding to the U component prediction mode (or the V component prediction mode) for the V component syntax element determined in step S105. (Refer to step S108 in FIG. 3).
- the entropy encoder 103 entropy encodes a prediction parameter including syntax related to a prediction mode.
- FIG. 5 is an explanatory diagram showing an example of Sequence parameter set RBSP syntax output by the entropy encoder 103.
- the Coding unit syntax is signaled as shown in Figs. 6 and 7.
- a code as illustrated in Fig. 3 is described in intra_second_chroma_pred_mode in Coding unit syntax.
- Non-Patent Document 2 a new color difference signal prediction (hereinafter referred to as intra_chromaFromLuma prediction) or a cross-correlation between a luminance component (luminance signal: luma signal) and a color difference component (color difference signal: chroma signal) in the same coding unit is used. (Referred to as linear prediction mode). Specific operation steps for intra_chromaFromLuma prediction are described in Section 8.3.1.3.8 Section of Intra_FromLuma prediction mode in Non-Patent Document 2. The outline is shown below.
- nS is the width of the color difference signal (color difference block signal) (that is, the width of the reconstructed luminance signal (color difference block signal) necessary for processing is 2 + 2 * nS).
- Step 3 Based on L, C, S, and X, calculate linear prediction coefficients a and b to linearly predict block boundary color difference signal (y) from block boundary downsampled luminance signal (p Y ') To do.
- the prediction of the U component and the prediction of the V component of the processing target block is optimized independently. This is because the U component and the V component are respectively linearly predicted from the luminance component based on the weighting factor a and the offset coefficient b that are independently optimized for the U component and the V component.
- the linear prediction mode is included in the intra prediction mode used by the intra predictor 106 ⁇ ⁇ ⁇ , for example, 1 of chroma_pred_from_luma_enabled_flag indicating the validity of the linear prediction mode is described in Sequence parameter set RBSP syntax.
- the intra_chroma_pred_mode of the U component of a certain processing target block is the linear prediction mode
- the encoding controller 109 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ does not signal the intra_second_chroma_pred_mode ⁇ of the V component in the Coding unit syntax of the processing target block. That is, when the linear prediction mode is also used as the prediction mode, the entropy encoder 103 does not perform encoding related to the prediction mode of the V component.
- the video encoding device 100 encodes the U prediction component intra prediction mode based on the Y prediction component intra prediction mode and the V prediction component based on the U prediction component intra prediction mode. Since the color difference intra prediction mode can be encoded and transmitted to the video decoding apparatus, an increase in the code amount of the V component can be suppressed.
- the linear prediction mode is included in the intra prediction mode used by the intra predictor 106, for example, 1 of chroma_pred_from_luma_enabled_flag indicating the validity of the linear prediction mode is described in Sequence parameter set RBSP syntax.
- the encoding controller 109 performs the following processing instead of signaling the intra_second_chroma_pred_mode of the V component in the Coding unit syntax of the processing target block. May be performed. That is, the coding controller 109 may perform signaling by assigning this linear prediction mode to any prediction mode to which a 3-bit code is assigned. This form is shown, for example, in the explanatory diagram of FIG.
- FIG. The second embodiment is an embodiment of a video decoding device that decodes a bitstream generated by the video encoding device of the first embodiment.
- FIG. 9B is a block diagram showing the configuration of the video decoding apparatus 200 ′ of the second embodiment.
- the video decoding device 200 of this embodiment is similar to the general video decoding device 200A shown in FIG. 16 in that the entropy decoder 203, the inverse frequency transform / inverse quantizer 204, the buffer 205, an intra predictor 206, an inter predictor 207, and a switch 210 ⁇ ⁇ ⁇ .
- the video decoding device 200 ⁇ ⁇ ⁇ further includes a decoding controller 209.
- the intra predictor 206 has a function of performing intra prediction of the V component in a prediction mode different from the prediction mode of the U component.
- the entropy decoder 203 Since the entropy decoder 203, the inverse frequency transform / inverse quantizer 204, the buffer 205, the inter predictor 207, and the switch 210 ⁇ are the same as those shown in FIG. 16, the following mainly describes the intra predictor 206.
- the operation of the decoding controller 209 will be described.
- the intra predictor 206 determines the U ⁇ ⁇ component of the chrominance component based on the prediction mode of the U component included in the prediction parameter decoded by the entropy decoder 203. Is predicted (step S201). In addition, when it is signaled that the prediction mode of the luminance component and the prediction mode of the color difference component are signaled, the intra predictor 206 ⁇ applies the same prediction mode as the prediction mode of the luminance component as the prediction mode of the U component. .
- the decoding controller 209 determines whether or not intra_second_chroma_pred_mode_enable_flag decoded by the entropy decoder 203 is 0 (step S202).
- intra_second_chroma_pred_mode_enable_flag is 0, the decoding controller 209 supplies information indicating that the V component is predictively decoded in the same prediction mode as the prediction mode of the U component to the intra predictor 206.
- the intra predictor 206 performs prediction of the V component based on the same prediction mode as the prediction mode of the U component according to the information (step S203).
- the decoding controller 209 transmits the prediction mode specified by the content of intra_second_chroma_pred_mode included in the prediction parameter decoded by the entropy decoder 203 to the intra predictor 206.
- the intra predictor 206 predicts the V component according to the content of intra_second_chroma_pred_mode (step S204).
- intra_second_chroma_pred_moded has a code corresponding to the prediction mode of the U component (for example, a code corresponding to the prediction mode 34) or a code that can specify the prediction mode of the V component (for example, prediction mode 0, Codes corresponding to 1, 10 or 26) are described.
- intra_chroma_pred_mode of the U component In the processing target block in which is in the linear prediction mode, V component intra_second_chroma_pred_mode is not decoded. In this case, intra_second_chroma_pred_mode is not transmitted from the video encoding device. Therefore, the entropy decoder 203 does not decode the intra prediction mode of the V component when the intra prediction mode of the U component is the linear prediction mode.
- the entropy decoder 203 does not decode the V component intra prediction mode. Specifically, when 1 ⁇ ⁇ is described in chroma_pred_from_luma_enabled_flag in Sequence parameter set RBSP syntax, the decoding controller 209 decodes the entropy decoder 203 in the processing target block whose intra prediction mode is not the linear prediction mode. The prediction mode specified by the content of intra_second_chroma_pred_mode included in the predicted parameter is transmitted to the intra predictor 206. It is specified that the linear prediction mode is used for prediction of the V component in the processing target block whose intra prediction mode of the U component is the linear prediction mode. In that case, the intra predictor 206 ⁇ ⁇ predictively decodes the V component according to the definition of the linear prediction mode (for example, see Non-Patent Document 2).
- the video decoding apparatus 200 can perform predictive decoding on the V component in the prediction mode suitable for the V component based on the intra prediction mode of the U component. The increase of is suppressed.
- the entropy decoder 203 performs the following processing. May be. That is, the entropy decoder 203 decodes a prediction parameter including intra_second_chroma_pred_mode. Then, the decoding controller 209 transmits the prediction mode specified by the content of intra_second_chroma_pred_mode included in the prediction parameter decoded by the entropy decoder 203 to the intra predictor 206.
- the prediction mode specified by the content of intra_second_chroma_pred_mode is a linear prediction mode.
- the intra predictor 206 uses the content of intra_second_chroma_pred_mode to predictively decode the V component according to the definition of the linear prediction mode (for example, see Non-Patent Document 2).
- the information processing system shown in FIG. 11 includes a processor 1001, a program memory 1002, a storage medium 1003 for storing video data, and a storage medium 1004 for storing a bitstream.
- the storage medium 1003 and the storage medium 1004 may be separate storage media, or may be storage areas composed of the same storage medium.
- a magnetic storage medium such as a hard disk can be used as the storage medium.
- the program memory 1002 stores a program for realizing the function of each block (except for the buffer block) shown in FIGS. Then, the processor 1001 implements the functions of the video encoding device or the video decoding device shown in FIG. 1B and FIG. 9B by executing processing according to the program stored in the program memory 1002.
- FIG. 12 is a block diagram showing the main part of the video encoding apparatus according to the present invention.
- the video encoding apparatus according to the present invention is realized by an intra prediction unit 11 that predicts a processing target block based on an adjacent reconstructed image (in the embodiment shown in FIG.
- a first chrominance intra prediction mode encoding unit 12 (see FIG. 1) that encodes the first chrominance intra prediction mode that is the intra prediction mode of the first chrominance component based on the luminance component intra prediction mode.
- this is realized by the entropy encoder 103 and the encoding controller 109)), and the second color difference intra prediction that is the second color difference component intra prediction mode based on the first color difference intra prediction mode.
- a second color difference intra prediction mode encoding unit 13 (which is realized by an entropy encoder 103 and an encoding controller 109 ⁇ ⁇ in the embodiment shown in FIG. 1) for encoding a mode.
- FIG. 13 is a block diagram showing the main part of the video decoding apparatus according to the present invention.
- the video decoding apparatus according to the present invention is realized by an intra prediction unit 21 that predicts a decoding target block based on an adjacent reconstructed image (in the embodiment shown in FIG.
- a first chrominance intra prediction mode decoding unit 22 for decoding the first chrominance intra prediction mode that is the intra prediction mode of the first chrominance component based on the intra prediction mode of the luminance component (implementation shown in FIG. 9B).
- the second color difference intra prediction mode which is an intra prediction mode of the second color difference component, is decoded based on the first color difference intra prediction mode.
- a second color difference intra prediction mode decoding unit 23 (implemented by the entropy decoder 203 and the decoding controller 209 in the embodiment shown in FIG. 9).
- Intra prediction means for predicting a processing target block based on an adjacent reconstructed image, the same as the intra prediction mode of the first color difference component and the intra prediction mode of the second color difference component of the color difference components
- a video encoding device comprising: signaling means for signaling information for specifying whether or not, and signaling information indicating an intra prediction mode of the second color difference component when they are different.
- Supplementary note 2 The video of Supplementary note 1, wherein the signaling means describes a 1-bit signaling element when the intra prediction mode of the second chrominance component is the same as the intra prediction mode of the first chrominance component Encoding device.
- the signaling unit can specify the intra prediction mode of the second chrominance component.
- the video encoding apparatus according to appendix 2, which signals information.
- the intra prediction means which predicts a decoding process target block based on the adjacent reconstructed image, and the intra prediction mode of the 1st color difference component of the color difference components are the same as the intra prediction mode of the 2nd color difference component
- a video decoding device is
- the prediction mode information determination unit The video decoding device according to appendix 4, wherein the second chrominance component is predicted based on the signaled information that can specify the intra prediction mode of the second chrominance component.
- Intra Prediction Unit 12 First Color Difference Intra Prediction Mode Encoding Unit 13 Second Color Difference Intra Prediction Mode Coding Unit 21
- Intra Prediction Unit 22 First Color Difference Intra Prediction Mode Decoding Unit 23 Second Color Difference Intra Prediction Mode Decoding Unit 100
- Video Coding Equipment 101 Frequency transformer 102 Quantizer 103 Entropy encoder 104 Inverse frequency transformer / inverse quantizer 105 Buffer 106 Intra predictor 107 Inter predictor 109 Coding controller 110 Switch 200
- Video decoder 203 Entropy decoder 204 Inverse Frequency converter / inverse quantizer 205 Buffer 206 Intra predictor 207 Inter predictor 209
- Decoding control unit 210 Switch 1001 Processor 1002 Program memory 1003 Storage medium 1004 Storage medium
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Abstract
Description
図1 は、映像符号化装置100 の第1の実施形態を示すブロック図である。図1 を参照して、ディジタル化された映像の各フレームを入力画像としてビットストリームを出力する第1 の実施形態の映像符号化装置100 の構成を説明する。
ただし、nSは色差信号(色差ブロック信号)の幅である(つまり、処理に必要な再構築輝度信号(色差ブロック信号)の幅は、2+2*nSとなる)。
イントラ予測器106 が使用するイントラ予測モードに線形予測モードを含める場合には、例えば、Sequence parameter set RBSP syntaxに、線形予測モードの有効を示すchroma_pred_from_luma_enabled_flagの1 を記述する。この場合、符号化制御器109 は、ある処理対象ブロックのU 成分のintra_chroma_pred_modeが線形予測モードである場合、該処理対象ブロックのCoding unit シンタクスにおいて、V 成分のintra_second_chroma_pred_mode をシグナリングさせない代わりに、以下の処理を行ってもよい。すなわち、符号化制御器109 は、3bitの符号が割り当てられている予測モードのいずれかに、この線形予測モードを割り当ててシグナリングしてもよい。この形態は、例えば図8 の説明図で示される。
第2の実施形態は、第1の実施形態の映像符号化装置が生成したビットストリームを復号する映像復号装置の実施形態である。
U 成分の予測モードとして線形予測モードが適用された場合、すなわち、シグナリングされたSequence parameter set RBSP syntaxにおいて、chroma_pred_from_luma_enabled_flagに1 が記述されている場合に、エントロピー復号器203 は、以下の処理を実行してもよい。すなわちエントロピー復号器203 は、intra_second_chroma_pred_modeを含む予測パラメータを復号する。そして復号制御器209 は、エントロピー復号器203 が復号した予測パラメータに含まれるintra_second_chroma_pred_mode の内容で特定される予測モードをイントラ予測器206 に伝達する。ここで、intra_second_chroma_pred_mode の内容で特定される予測モードとは、線形予測モードのことである。イントラ予測器206 は、intra_second_chroma_pred_mode の内容を用いて、V 成分を、線形予測モードの規定(例えば、非特許文献2参照)に従って予測復号する。
12 第1色差イントラ予測モード符号化部
13 第2色差イントラ予測モード符号化部
21 イントラ予測部
22 第1色差イントラ予測モード復号部
23 第2色差イントラ予測モード復号部
100 映像符号化装置
101 周波数変換器
102 量子化器
103 エントロピー符号化器
104 逆周波数変換/逆量子化器
105 バッファ
106 イントラ予測器
107 インター予測器
109 符号化制御器
110 スイッチ
200 映像復号装置
203 エントロピー復号器
204 逆周波数変換/逆量子化器
205 バッファ
206 イントラ予測器
207 インター予測器
209 復号制御部
210 スイッチ
1001 プロセッサ
1002 プログラムメモリ
1003 記憶媒体
1004 記憶媒体
Claims (12)
- 処理対象ブロックを、隣接する再構築画像に基づいて予測するイントラ予測手段と、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを符号化する第1色差イントラ予測モード符号化手段と、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを符号化する第2色差イントラ予測モード符号化手段とを備える
ことを特徴とする映像符号化装置。 - 前記第2色差イントラ予測モード符号化手段は、前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを符号化しない
請求項1記載の映像符号化装置。 - 復号処理対象ブロックを隣接する再構築画像に基づいて予測するイントラ予測手段と、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを復号する第1色差イントラ予測モード復号手段と、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを復号する第2色差イントラ予測モード復号手段とを備える
ことを特徴とする映像復号装置。 - 前記第2色差イントラ予測モード復号手段は、前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを復号しない
請求項3記載の映像復号装置。 - 処理対象ブロックを、隣接する再構築画像に基づいて予測するイントラ予測手段を備える映像符号化装置で実行される映像符号化方法であって、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを符号化し、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを符号化する
ことを特徴とする映像符号化方法。 - 前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを符号化しない
請求項5記載の映像符号化方法。 - 復号処理対象ブロックを隣接する再構築画像に基づいて予測するイントラ予測手段を備える映像復号装置で実行される映像復号方法であって、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを復号し、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを復号する
ことを特徴とする映像復号方法。 - 前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを復号しない
請求項7記載の映像復号方法。 - 処理対象ブロックを、隣接する再構築画像に基づいて予測するイントラ予測手段を備えるコンピュータに、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを符号化させ、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを符号化させる
ための映像符号化プログラム。 - コンピュータに、
前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを符号化させない
請求項9記載の映像符号化プログラム。 - 復号処理対象ブロックを隣接する再構築画像に基づいて予測するイントラ予測手段を備えるコンピュータに、
輝度成分のイントラ予測モードに基づいて第1の色差成分のイントラ予測モードを復号させ、
前記第1の色差成分のイントラ予測モードに応じて第2の色差成分のイントラ予測モードを復号させる
ための映像復号プログラム。 - コンピュータに、
前記第1の色差成分のイントラ予測モードが線形予測モードである場合には、前記第2の色差成分のイントラ予測モードを復号させない
請求項11記載の映像復号プログラム。
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