WO2014002386A1 - 映像符号化装置、映像復号装置、映像符号化方法、映像復号方法およびプログラム - Google Patents
映像符号化装置、映像復号装置、映像符号化方法、映像復号方法およびプログラム Download PDFInfo
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- WO2014002386A1 WO2014002386A1 PCT/JP2013/003459 JP2013003459W WO2014002386A1 WO 2014002386 A1 WO2014002386 A1 WO 2014002386A1 JP 2013003459 W JP2013003459 W JP 2013003459W WO 2014002386 A1 WO2014002386 A1 WO 2014002386A1
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- H—ELECTRICITY
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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
- H04N19/102—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
- H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
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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
- H04N19/102—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
- H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
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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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- 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
- H04N19/17—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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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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
- H04N19/70—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 video encoding device and a video decoding device that use PCM encoding.
- Non-Patent Document 1 discloses a general-purpose video coding technique based on a transform coding technique, a predictive coding technique, and an entropy coding technique.
- PCM Pulse Code Modulation
- Non-Patent Document 1 The video encoding device described in Non-Patent Document 1 is configured as shown in FIG.
- the video encoding device shown in FIG. 11 is referred to as a general video encoding device.
- 11 includes a transform / quantizer 102, an entropy encoder 103, an inverse transform / inverse quantizer 104, a buffer 105, a predictor 106, a PCM coder 107, a PCM decoder 108, A multiplexed data selector 109, a multiplexer 110, a switch 121, and a switch 122 are provided.
- the frame is composed of LCU (Largest Coding Unit).
- LCU is composed of CU (Coding Unit).
- the video encoding apparatus shown in FIG. 11 encodes the LCUs in raster scan order and the CUs constituting the LCUs in zet scan order.
- the size of the CU is 64 ⁇ 64, 32 ⁇ 32, 16 ⁇ 16, or 8 ⁇ 8.
- the smallest CU is called Smallest Coding Unit (SCU).
- inter-frame prediction a prediction signal is generated based on an image of a reconstructed picture (reference picture) having a different display time from the current picture stored in the buffer 105.
- reference picture a reconstructed picture
- inter CU a CU that uses inter-frame prediction
- a picture encoded only by an intra CU is called an I picture.
- a picture that is encoded including not only an intra CU but also an inter CU that uses one reference picture for inter-frame prediction is called a P picture.
- a picture encoded including an inter CU that uses two reference pictures simultaneously for inter-frame prediction is called a B picture.
- the transform / quantizer 102 performs frequency conversion on the image (prediction error image) from which the prediction signal is reduced, and obtains a frequency conversion coefficient of the prediction error image.
- the entropy encoder 103 entropy encodes the prediction parameter and the quantization level value.
- the prediction parameter is information related to the above-described CU prediction type (intra prediction, inter prediction) and PU (Prediction Unit) information included in the CU.
- the inverse transformer / inverse quantizer 104 inverse-quantizes the quantization level value with the quantization step width Qs. Further, the inverse transform / inverse quantizer 104 performs inverse frequency transform on the frequency transform coefficient obtained by inverse quantization. The reconstructed prediction error image subjected to the inverse frequency conversion is supplied with a prediction signal and supplied to the switch 122.
- the multiplexed data selector 109 monitors the input data amount of the entropy encoder 103 corresponding to the CU to be encoded.
- the multiplexed data selector 109 selects the output data of the entropy encoder 103 and passes through the switch 121.
- the multiplexed data selector 109 selects the output data of the inverse transform / inverse quantizer 104 and supplies it to the buffer 105 via the switch 122.
- the multiplexed data selector 109 selects the output data of the PCM encoder 107 and supplies it to the multiplexer 110 via the switch 121. Furthermore, the multiplexed data selector 109 selects the output data obtained by PCM decoding the output data of the PCM coder 107 by the PCM decoder 108 and supplies it to the buffer 105 via the switch 122.
- the buffer 105 stores the reconstructed image supplied via the switch 122.
- a reconstructed image for one frame is called a reconstructed picture.
- the multiplexer 110 in the video encoding device Based on the above-described operation, the multiplexer 110 in the video encoding device generates a bit stream.
- the block header is entropy encoded. That is, when transmitting the block header of the PCM mode (PCM mode header), two processes are required: an output process of the non-output symbol of the encoding engine of the entropy encoder 103 and a reset process of the encoding engine.
- the block header of the PCM-mode is usually configured by CU partition information (split_coding_unit_flag syntax), CU prediction type (skip_flag syntax, pred_mode_flag syntax and pred_mode syntax), PU PCM flag (pcm_flag syntax), and the like.
- FIG. 13 the encoding of successive PCMPC mode image blocks will be described.
- 4 CUs (CU (4) (, CU (5) and CU (6)) that are consecutive in the coding order are PCM encoded.
- the other CU is a block (Non_I_PCM) on which intra prediction / inter prediction encoding is performed.
- Non_I_PCM Non_I_PCM
- bitstreams are the entropy-encoded video bitstream of CU (3) / CU (7), the video bitstream of PCM mode header of CU (4) / CU (5) / CU (6), non-entropy It includes the alignment data (pcm_alignment_zero_bit) and PCM data (PCM sample data) of the encoded CU (4) / CU (5) / CU (6).
- CU (4) / CU (5) / CU (6) of consecutive I_PCM is entropy-coded for its PCM mode header, so the output processing of the above-mentioned encoding engine's non-output symbol and its reset Let the process repeat. Therefore, even though CU (4) / CU (5) / CU (6) is a continuous I_PCM, before multiplexing the PCM data of each CU into the bitstream, the above code for the PCM mode header It is necessary to wait for the output processing of the non-output symbol of the conversion engine and the reset processing thereof to be completed.
- PCM data of continuous PCM mode image blocks cannot be efficiently multiplexed into a bit stream, that is, PCM data of continuous PCM mode image blocks cannot be efficiently transmitted.
- the present invention relates to a video encoding device, a video decoding device, a video encoding method, a video decoding method, and a video encoding that enable efficient transmission of PCM data even when PCM mode image blocks occur continuously. It is an object to provide a program and a video decoding program.
- a video encoding apparatus includes a conversion unit that converts an image block, an entropy encoding unit that entropy-encodes conversion data of the image block converted by the conversion unit, and a PCM-encoding unit that performs PCM-encoding of the image block.
- multiplexed data selection means for selecting one of the output data of the entropy coding means and the PCM coding means for each image block, and the PCM coding means follows the PCM data of the next image block. It is characterized in that a substitute_pcm_flag syntax indicating whether or not is embedded at the beginning of PCM data.
- the video decoding device includes a demultiplexing means for demultiplexing a bitstream including a subsequent_pcm_flag syntax indicating whether or not the PCM data of the next image block follows, and PCM data of the image block included in the bitstream PCM decoding means for PCM decoding, entropy decoding means for entropy decoding the transform data of the image block included in the bitstream, and the value of the sequential_pcm_flag syntax of the image block immediately before the image block to be decoded is 1
- the entropy decoding means includes decoding control means for preventing entropy decoding of the PCM mode header of the image block to be decoded.
- the video encoding method converts an image block, entropy-encodes the converted data of the converted image block, and uses a subsequent_pcm_flag syntax that indicates whether the next image block is followed by PCM data.
- the image block is PCM-encoded by embedding the image block, and output data that is either entropy-encoded output data or PCM-encoded output data is selected for each image block.
- the video decoding method demultiplexes a bitstream including a subsequent_pcm_flag syntax indicating whether or not PCM ⁇ data of the next image block follows, and PCM decodes the PCM ⁇ data of the image block included in the bitstream,
- PCM decodes the PCM ⁇ data of the image block included in the bitstream
- the entropy decoding is performed on the conversion data of the image block included in the bitstream, and the value of the sequential_pcm_flag syntax of the image block immediately before the image block to be decoded is 1, the image block to be decoded It is characterized by not entropy decoding the PCM mode header.
- a video encoding program includes a computer that performs conversion processing for converting an image block, entropy encoding processing for entropy encoding conversion data of the image block converted by the conversion processing, and PCM code for PCM coding the image block. And a multiplexed data selection process for selecting output data generated by either the entropy encoding process or the PCM-encoding process for each image block, and the next image block in the PCM-encoding process. This is characterized in that a subsequent_pcm_flag syntax indicating whether or not the PCM data follows is embedded at the head of the PCM data.
- the video decoding program provides a computer with a demultiplexing process for demultiplexing a bitstream including a subsequent_pcm_flag syntax indicating whether or not the PCM ⁇ data of the next image block follows, and an image block included in the bitstream.
- PCM decoding processing for PCM data decoding entropy decoding processing for entropy decoding of image block conversion data included in the bitstream, and the value of the sequential_pcm_flag syntax of the image block immediately before the image block to be decoded is 1.
- the PCM decoding process is caused to execute a decoding control process that does not entropy decode the PCM mode header of the image block to be decoded.
- the video encoding apparatus is configured so that the non-output symbol output process and the encoding engine reset process are not repeatedly executed in the encoding of consecutive PCM mode image blocks, between the PCM data of consecutive PCM mode image blocks. , Do not insert entropy-encoded PCM mode headers. Instead of inserting a PCM mode header, the video encoding apparatus according to the present invention uses a subsequent_pcm_flag syntax and a PCM indicating whether PCMPC data of the next image block follows between PCM data of successive PCM mode image blocks. A pair with the pcm_alignment_zero_bit syntax for byte alignment of the data write start address is placed at the beginning of each PCM data. As will be described later, the subsequent_pcm_flagcm syntax and the pcm_alignment_zero_bit syntax are non-entropy coded.
- FIG. FIG. 1 is a block diagram illustrating a video encoding apparatus according to the first embodiment.
- the video encoding apparatus according to the present embodiment is different from the video encoding apparatus shown in FIG. 11 in the configuration of the PCM encoder 1070.
- the PCM encoder 1070 in this embodiment is a subsequent PCM that detects whether there is a PCM mode image block following the PCM mode image block to be encoded.
- a detector 1071 is included.
- FIG. 1 shows an example in which the subsequent PCM detector 1071 exists in the PCM encoder 1070, but this is not essential.
- the subsequent PCM detector 1071 may be provided in a part other than the PCM encoder 1070 (for example, the multiplexed data selector 109), or may be provided independently of each part shown in FIG.
- FIG. 3 the operation of the video encoding device will be described by taking CU (4), CU (5) and CU (6) of the PCM mode image block of FIG. 2 (A) as an example.
- the video encoding apparatus of this embodiment operates as shown in the flowchart of FIG. That is, the subsequent PCM detector 1071 detects whether or not the next image block of each PCM mode image block is in the PCM mode in step S101. If the PCM mode is selected, the syntax of subsequent_pcm_flag is set to 1. Otherwise, the subsequent_pcm_flag syntax is 0. When the example shown in FIG. 13A is used, the value of subsequent_pcm_flag of CU (4) and CU (5) is 1, and the value of sequential_pcm_flag of CU (6) is 0. When not in PCM mode, the value of subsequent_pcm_flag is defined as 0.
- step S102 the entropy encoder 103 entropy-encodes the PCM mode header of CU (4) that is the first PCM mode image block.
- step S103 the entropy encoder 103 outputs a symbol that has not yet been output.
- step S104 the PCM encoder 1070 performs non-entropy coding on the CU (n) subsequent_pcm_flag syntax.
- step S105 the PCM encoder 1070 performs non-entropy encoding of the pcm_alignment_zero_bit syntax of CU (n). That is, the write start address of PCM data of CU (n) is byte aligned.
- pcm_alignment_one_bit having a value of 1 may be used instead of the pcm_alignment_zero_bit syntax.
- step S107 the multiplexed data selector 109 determines whether the subsequent_pcm_flag syntax of CU (n) is 1 or not. In the case of 1, the process proceeds to step S108, that is, n is incremented, and the process proceeds to encoding of the next PCM mode image block. In the case of 0, the process proceeds to step S109.
- the multiplexer 110 outputs a bit stream obtained by multiplexing the data encoded by the PCM encoder 1070 and the entropy encoder 103.
- the operation of the video encoding apparatus of the present embodiment described above may not insert the entropy-encoded PCM mode header between the PCM ⁇ data of successive PCM mode image blocks.
- a set of sequential_pcm_flag syntax and pcm_alignment_zero_bit syntax (total of 8 bits) is arranged at the head of each PCM data between PCM data of consecutive PCM data modes. Since the number of bits of one PCM data is always a multiple of 8 bits, the start position of the subsequent_pcm_flag syntax is always a multiple of 8 bits. That is, the start position of each subsequent_pcm_flag syntax, PCM data, and first entropy encoded data is always a byte-aligned address.
- the subsequent_pcm_flag syntax and the pcm_alignment_zero_bit syntax that are placed between PCM data of successive PCM mode image blocks are non-entropy encoded. Therefore, when multiplexing the PCM data of the PCM mode image block following the first PCM mode image block into the bitstream, it is necessary to wait for the output processing of the above-mentioned encoding engine non-output symbols and the reset processing thereof to be completed. Absent. Therefore, the video encoding apparatus according to the present embodiment can efficiently multiplex PCM data of successive PCM mode image blocks into a bit stream. That is, it is possible to efficiently transmit PCM data of successive PCM mode image blocks.
- FIG. FIG. 4 is a block diagram showing a video decoding apparatus corresponding to the video encoding apparatus of the first embodiment.
- the video decoding apparatus according to the present embodiment includes a demultiplexer 201, a decoding controller 202, a PCM decoder 203, an entropy decoder 204, an inverse transform / inverse quantizer 206, a predictor 207, a buffer 208, and a switch 221.
- a switch 222 is provided.
- the PCM decoder 203 includes a subsequent PCM determiner 2031 that determines whether or not a CU that is currently decoded follows the CU in the PCM mode that was decoded immediately before.
- FIG. 4 shows an example in which the subsequent PCM determinator 2031 exists in the PCM decoder 203, but this is not essential.
- the subsequent PCM determining unit 2031 may be provided in a part other than the PCM decoding unit 203 (for example, the decoding controller 202), or may be provided independently of each unit shown in FIG.
- the demultiplexer 201 demultiplexes the input bit stream and extracts the video bit stream.
- the unit 202 does not cause the entropy decoder 204 to entropy decode the CU / PU header of the CU currently being decoded.
- the decoding controller 202 reads the subsequent_pcm_flag syntax and pcm_alignment_zero_bit syntax of the PCM mode CU to be decoded from the video bitstream, and supplies the subsequent PCM data to the PCM decoder 203.
- the PCM decoder 203 reads the supplied PCM ⁇ data and performs PCM decoding.
- the decoding controller 202 switches the switch 222 so that the reconstructed image supplied from the PCM / decoder 203 is supplied to the buffer 208.
- the decoding controller 202 resets the decoding engine of the entropy decoder 204. Then, the process proceeds to decoding of the next CU. Note that, for the subsequent decoding of the CU, the decoding controller 202 stores the current value of succeed_pcm_flag.
- the decoding controller 202 performs the decoding to the entropy decoder 204. Entropy decode the CU / PU header.
- the decoding controller 202 When the entropy decoder 204 entropy-decodes pcm_flag having a value of 1, the decoding controller 202 reads the PCM mode CU subsequent_pcm_flag syntax and pcm_alignment_zero_bit syntax to be decoded from the video bitstream, and the subsequent PCM data is the PCM decoder. 203.
- the PCM decoder 203 reads the supplied PCM ⁇ data and performs PCM decoding.
- the decoding controller 202 switches the switch 222 so that the reconstructed image supplied from the PCM / decoder 203 is supplied to the buffer 208.
- the decoding controller 202 When the read sequential_pcm_flagcm syntax is 0, the decoding controller 202 resets the decoding engine of the entropy decoder 204. Then, the process proceeds to decoding of the next CU.
- the entropy decoder 204 When the entropy decoder 204 entropy-decodes pcm_flag having a value of 0 or when pcm_flag does not exist, the entropy decoder 204 further entropy-decodes the prediction parameter and quantization level value of the CU to be decoded. To the inverse transform / inverse quantizer 206 and the predictor 207.
- the inverse transform / inverse quantizer 206 inverse quantizes the quantization level value, and further inverse frequency transforms the inversely quantized frequency transform coefficient.
- the predictor 207 After the inverse frequency conversion, the predictor 207 generates a prediction signal using the reconstructed picture image stored in the buffer 208 based on the entropy-decoded prediction parameter. After the prediction signal is generated, the reconstructed prediction error image subjected to inverse frequency conversion by the inverse transform / inverse quantizer 206 is added with the prediction signal supplied from the predictor 207 and is supplied to the switch 222. After the prediction signal is added, the decoding controller 202 switches the switch 222 to supply the reconstructed prediction error image to which the prediction signal is added to the buffer 208 as a reconstructed image. Then, the process proceeds to decoding of the next CU.
- step S201 the subsequent PCM determining unit 2031 determines whether or not the CU (n-1) decoded immediately before is in the PCM ⁇ mode, and its subsequent_pcm_flag is 1. If the CU decoded immediately before is in the PCM mode and its subsequent_pcm_flag is 1, the process proceeds to step S205. Note that if the PCM mode is not set, the subsequent_pcm_flag value is defined as 0, so that the subsequent PCM determiner 2031 may determine only whether or not the immediately_pcm_flag-1 of the CU (n-1) decoded immediately before is 1.
- step S202 the entropy decoder 204 performs entropy decoding on the CU / PU header of CU (n) to be decoded.
- step S203 the decoding controller 202 determines whether or not the pcm_flag having a value of 1 is entropy decoded. If pcm_flag having a value of 1 is entropy decoded, the process proceeds to step S205.
- step S204 the entropy decoder 204 performs entropy decoding on the prediction parameter and quantization level value of CU (n) n to be decoded. As described above, a reconstructed image of CU (n) is obtained based on the prediction parameter and the quantization level value, and the decoding process for CU (n) is terminated.
- step S205 the decoding controller 202 reads the PCM mode CU (n) subsequent_pcm_flag syntax to be decoded from the video bitstream.
- the PCM / decoder 203 may read the non-entropy-encoded subsequent_pcm_flag / syntax.
- step S206 the decoding controller 202 reads the pcm_alignment_zero_bit syntax of CU (n) in PCM mode to be decoded from the video bitstream.
- the PCM / decoder 203 may read the pcm_alignment_zero_bit syntax that is non-entropy encoded.
- step S207 the decoding controller 202 reads PCM data of CU (n) in PCM mode to be decoded from the video bitstream.
- the PCM decoder 203 may read the PCM data to be non-entropy encoded. As described above, a reconstructed image of CU (n) is obtained based on the PCM data.
- step S208 the decoding controller 202 determines whether or not the CU (n) subsequent_pcm_flag syntax is 1 ⁇ . If the syntax of the CU (n) sub subsequent_pcm_flag syntax is 1, the decoding process for the CU (n) ⁇ is terminated.
- the entropy decoder 204 resets its decoding engine in step S209. Then, the decoding process for CU (n) is terminated.
- the video decoding apparatus of the present embodiment According to the operation of the video decoding apparatus of the present embodiment described above, there is no need to wait for the completion of the reset process of the decoding engine when reading PCM data of the PCM mode image block following the first PCM mode image block from the bitstream. Therefore, the video decoding apparatus according to the present embodiment can efficiently read PCM data of successive PCM mode image blocks from the bitstream. That is, it is possible to efficiently receive PCM data of successive PCM mode image blocks.
- the Coding tree syntax and Pcm sample syntax corresponding to the above embodiments are shown in FIGS. 6 and 7, respectively.
- the variable SubSequentPCMFlag that stores the value of the immediately_CU's subsequent_pcm_flag syntax is 1, the block header of the PCM mode (split_coding_unit_flag syntax, syntax below coding_unit (), etc.) is not entropy encoded.
- split_coding_unit_flag syntax, syntax below coding_unit (), etc. is not entropy encoded.
- the information processing system shown in FIG. 8 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 shown in FIGS.
- the processor 1001 implements the functions of the video encoding device or the video decoding device shown in FIGS. 1 and 4 by executing processing according to the program stored in the program memory 1002.
- FIG. 9 is a block diagram showing the main part of the video encoding apparatus according to the present invention.
- a video encoding apparatus includes a conversion unit 11 that converts an image block, an entropy encoding unit 12 that entropy-encodes conversion data of the image block converted by the conversion unit 11, and an image A PCM-encoding unit 13 for PCM-encoding a block; and a multiplexed data selection unit 14 for selecting output data of either the entropy encoding unit 12 or the PCM-encoding unit 13 for each image block.
- the unit 13 embeds a substitute_pcm_flag syntax indicating whether or not the PCM data of the next image block follows at the head of the PCM data.
- FIG. 10 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 includes a demultiplexing unit 21 that demultiplexes a bitstream including a sequential_pcm_flag syntax indicating whether or not PCM data of the next image block follows, and a bitstream A PCM decoding unit 22 for PCM decoding the PCM data of the image block included in the image block, an entropy decoding unit 23 for entropy decoding the conversion data of the image block included in the bitstream, and an image block immediately before the image block to be decoded. and a decoding control unit 24 that does not entropy decode the PCM mode header of the image block to be decoded when the subsequent_pcm_flag syntax value is 1.
Abstract
Description
図1は、第1の実施形態の映像符号化装置を示すブロック図である。本実施形態の映像符号化装置は、図11に示す映像符号化装置と比較すると、PCM 符号化器1070の構成が異なる。本実施形態におけるPCM 符号化器1070は、図11に示すPCM 符号化器107とは異なり、符号化対象のPCM モード画像ブロックに後続するPCM モード画像ブロックが存在するか否かを検出する後続PCM 検出器1071を含む。なお、図1には、後続PCM 検出器1071がPCM 符号化器1070内に存在する例が示されているが、そのことは必須のことではない。後続PCM 検出器1071は、PCM 符号化器1070以外の部分(例えば、多重化データ選択器109)に設けられていてもよいし、図1に示す各部と独立して設けられていてもよい。
図4は、第1の実施形態の映像符号化装置に対応する、映像復号装置を示すブロック図である。本実施形態の映像復号装置は、多重化解除器201、復号制御器202、PCM 復号器203、エントロピー復号器204、逆変換/逆量子化器206、予測器207、バッファ208、およびスイッチ221とスイッチ222を備える。
12 エントロピー符号化部
13 PCM 符号化部
14 多重化データ選択部
21 多重化解除部
22 PCM 復号部
23 エントロピー復号部
24 復号制御部
102 変換/量子化器
103 エントロピー符号化器
104 逆変換/逆量子化器
105 バッファ
106 予測器
107 PCM 符号化器
108 PCM 復号器
109 多重化データ選択器
110 多重化器
121 スイッチ
122 スイッチ
201 多重化解除器
202 復号制御器
203 PCM 復号器
204 エントロピー復号器
206 逆変換/逆量子化器
207 予測器
208 バッファ
221 スイッチ
222 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
1070 PCM 符号化器
1071 後続PCM 検出器
2031 後続PCM 判定器
Claims (6)
- 画像ブロックを変換する変換手段と、
前記変換手段が変換した画像ブロックの変換データをエントロピー符号化するエントロピー符号化手段と、
画像ブロックをPCM 符号化するPCM 符号化手段と、
画像ブロックごとに前記エントロピー符号化手段と前記PCM 符号化手段のいずれかの出力データを選択する多重化データ選択手段とを備え、
前記PCM 符号化手段は、次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flag シンタクスをPCM データの先頭に埋め込む
ことを特徴とする映像符号化装置。 - 次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flagシンタクスを含むビットストリームを多重化解除する多重化解除手段と、
ビットストリームに含まれる画像ブロックのPCM データをPCM 復号するPCM 復号手段と、
ビットストリームに含まれる画像ブロックの変換データをエントロピー復号するエントロピー復号手段と、
復号対象とする画像ブロックの直前の画像ブロックのsubsequent_pcm_flagシンタクスの値が1 である場合に、前記エントロピー復号手段に、前記復号対象とする画像ブロックのPCM モードヘッダをエントロピー復号させない復号制御手段とを備える
ことを特徴とする映像復号装置。 - 画像ブロックを変換し、変換された画像ブロックの変換データをエントロピー符号化し、
次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flag シンタクスをPCM データの先頭に埋め込むことにより画像ブロックをPCM 符号化し、
画像ブロックごとに、エントロピー符号化された出力データとPCM 符号化された出力データのいずれかの出力データを選択する
ことを特徴とする映像符号化方法。 - 次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flagシンタクスを含むビットストリームを多重化解除し、
ビットストリームに含まれる画像ブロックのPCM データをPCM 復号し、
ビットストリームに含まれる画像ブロックの変換データをエントロピー復号し、
前記エントロピー復号の際、復号対象とする画像ブロックの直前の画像ブロックのsubsequent_pcm_flagシンタクスの値が1 である場合に、前記復号対象とする画像ブロックのPCM モードヘッダをエントロピー復号しない
ことを特徴とする映像復号方法。 - コンピュータに、
画像ブロックを変換する変換処理、
前記変換処理で変換された画像ブロックの変換データをエントロピー符号化するエントロピー符号化処理、
画像ブロックをPCM 符号化するPCM 符号化処理、および、
画像ブロックごとに前記エントロピー符号化処理と前記PCM 符号化処理のいずれか処理で生成された出力データを選択する多重化データ選択処理を実行させ、
前記PCM 符号化処理で、次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flag シンタクスをPCM データの先頭に埋め込ませる処理を実行させる
ための映像符号化プログラム。 - コンピュータに、
次の画像ブロックのPCM データが後続するか否かを示すsubsequent_pcm_flagシンタクスを含むビットストリームを多重化解除する多重化解除処理、
ビットストリームに含まれる画像ブロックのPCM データをPCM 復号するPCM 復号処理、
ビットストリームに含まれる画像ブロックの変換データをエントロピー復号するエントロピー復号処理、および、
復号対象とする画像ブロックの直前の画像ブロックのsubsequent_pcm_flagシンタクスの値が1 である場合に、前記PCM 復号処理に、前記復号対象とする画像ブロックのPCM モードヘッダをエントロピー復号させない復号制御処理
を実行させるための映像復号プログラム。
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