WO2012020967A2 - 적응적 부호화/복호화 모드 인덱싱 기법을 이용한 영상 부호화/복호화 장치 및 방법 - Google Patents
적응적 부호화/복호화 모드 인덱싱 기법을 이용한 영상 부호화/복호화 장치 및 방법 Download PDFInfo
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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
- H04N19/10—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
- H04N19/134—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
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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
- H04N19/46—Embedding additional information in the video signal during the compression process
- H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
Definitions
- An embodiment of the present invention relates to an image encoding / decoding apparatus and method.
- the probability of occurrence of an encoding mode or a decoding mode for a current block to be encoded or decoded is calculated, and an empty string is allocated or a preset sequence of encoding modes is switched, Adaptive coding / decoding mode indexing technique to efficiently manage transmission bits by changing the indexing order or variable length code of encoding mode or decoding mode accordingly.
- a suitable coding scheme determined by an encoder is determined using a preset coding mode indexing table. Decoding was performed.
- a coding mode having a long length of bit may be selected in some situations. Therefore, fixed mode indexing, which is not adaptive to a characteristic of an image, has a limitation in encoding performance because many mode indexing bits may be allocated to a specific sequence or frame. For example, for an image containing a lot of small objects and complex textures relative to the image size, the P8x8 mode is better suited to coding complex blocks in smaller units than the P16x16 mode, which is efficient for performing motion prediction in large units. In this case, mode indexing is appropriate to have lower bits in P8x8 than in P16x16.
- An embodiment of the present invention has been devised to effectively solve the constraints of encoding performance caused by mode indexing using a fixed order or variable length code, which is the aforementioned problem, and is applied to a current block to be encoded or decoded. Calculate the probability of occurrence of the encoding mode or decoding mode for the encoding mode and allocate an empty string or switch the order of preset encoding modes according to the characteristics of the image.
- An image encoding / decoding apparatus calculates the probability of appearance for each encoding mode of the blocks that have been encoded before the current block, and corresponding to the probability for each encoding mode
- An image encoder for allocating an empty string or for switching a preset sequence of encoding modes, thereby encoding the encoding mode of the current block; And calculating a probability of occurrence of each decoding mode of the blocks that have been decoded before the target block to be decoded, allocating an empty string or switching the order of a predetermined decoding mode corresponding to the probability of each decoding mode.
- an image decoder for decoding the decoding mode of the target block received from the encoder.
- an apparatus for encoding an image comprising: a statistics generator configured to calculate an appearance probability of each encoding mode of blocks in which encoding is completed before a current block; A bit allocator for allocating and indexing an empty string corresponding to a probability for each encoding mode calculated by the statistics generator; And an image encoder which encodes an encoding mode of the current block based on the empty string allocated by the bit allocator when the current block is encoded.
- the image encoding apparatus may further include an exception processing unit for transmitting an additional additional bit for the changed image to update the empty string allocated by the bit allocator when the characteristic of the image changes.
- the statistics generator may calculate the appearance probability for the SKIP mode and the appearance probability for each split mode of the blocks that have been encoded before the current block.
- the statistical generator may calculate a probability of occurrence of each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- the bit allocator may allocate an empty string based on at least one of a Huffman code, an arithmetic code, and an exponential Golomb code.
- An image encoding apparatus for achieving the above object, the statistical calculation unit for calculating the probability of appearance based on the encoding mode information obtained after the encoding of the macroblock, slice, frame or sequence of the image is completed ; A bit allocator for allocating and indexing an empty string corresponding to a probability of the encoding mode information calculated by the statistic generator; And an image encoder which encodes an encoding mode for the image based on an empty string allocated by the bit allocator when encoding a macroblock, slice, frame, or sequence of the image.
- the empty string information allocated by the bit allocation unit may be included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH).
- PPS picture parameter set
- SPS sequence parameter set
- SH slice header
- an apparatus for encoding an image comprising: a statistics generator configured to calculate a probability of occurrence of each encoding mode of blocks in which encoding is completed before a current block; A coding order switching unit for switching and indexing a predetermined order of encoding modes in response to a probability of each encoding mode calculated by the statistical generator; And an image encoder which encodes an encoding mode of the current block based on the order switched by the coding order switching unit when encoding the current block.
- the image encoding apparatus may further include an exception processing unit for re-switching the order switched by the coding order switching unit according to the characteristic of the changed image when the characteristic of the image is changed.
- the statistics generator may calculate the appearance probability for the SKIP mode and the appearance probability for each split mode of the blocks that have been encoded before the current block.
- the statistical generator may calculate a probability of occurrence of each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- a video encoding apparatus may include: a statistical calculation that calculates a probability of occurrence based on encoding mode information obtained after encoding of a macroblock, slice, frame, or sequence of an image is completed; part; A coding order switching unit for switching and indexing a predetermined order of encoding modes in response to a probability of the encoding mode information calculated by the statistical generator; And an image encoder which encodes an encoding mode for the image based on the order switched by the coding order switching unit when encoding the macroblock, the slice, the frame, or the sequence of the image.
- the encoding mode information switched by the coding order switching unit may be included in at least one of PPS, SPS, and SH.
- an apparatus for decoding an image including: a statistics generator configured to calculate a probability of occurrence of each decoding mode of blocks in which decoding is completed before a current block; A bit allocator for allocating and indexing an empty string corresponding to a probability for each decoding mode calculated by the statistics generator; And a decoding mode corresponding to the empty string allocated by the bit allocating unit corresponding to the decoding mode for the current block when decoding the current block.
- the image decoding apparatus may further include an exception processor for transmitting an additional additional bit for the changed image to update the empty string allocated by the bit allocator when the characteristic of the image is changed.
- the statistics generator may calculate an appearance probability for the SKIP mode and an appearance probability for each split mode of the blocks that have been decoded before the current block.
- the statistics generator may calculate a probability of occurrence of each decoding mode of blocks in which decoding is performed before the current block for at least one unit of a frame, a sequence, and a coding unit.
- An image decoding apparatus for achieving the above object, the statistical calculation unit for calculating the probability of appearance based on the decoding mode information obtained after the decoding of the macroblock, slice, frame or sequence of the image is completed; ; A bit allocator for allocating and indexing an empty string corresponding to a probability of the decoding mode information calculated by the statistics generator; And an image decoder which, when decoding a macroblock, slice, frame or sequence of an image, decodes a decoding mode for a macroblock, slice, frame or sequence of an image based on an empty string allocated by a bit allocator. It features.
- the empty string information used for decoding in the decoding mode may be included in at least one of PPS, SPS, and SH.
- the decoder does not allocate an empty string through the statistical calculation unit and the bit allocation unit.
- the decoding mode is decoded by directly using the empty string information included in at least one of the transmitted data.
- an apparatus for decoding an image including: a statistics generator configured to calculate a probability of occurrence of each decoding mode of blocks in which decoding is completed before a current block; A coding order switching unit for switching and indexing an order of a predetermined decoding mode in response to a probability of each decoding mode calculated by the statistical generator; And an image encoder which decodes the decoding mode according to the order switched by the coding order switching unit corresponding to the decoding mode for the current block when decoding the current block.
- the image decoding apparatus may further include an exception processing unit for re-switching the order switched by the coding order switching unit according to the characteristic of the changed image when the characteristic of the image is changed.
- an exception processing unit for re-switching the order switched by the coding order switching unit according to the characteristic of the changed image when the characteristic of the image is changed.
- the statistics generator may calculate an appearance probability for the SKIP mode and an appearance probability for each split mode of the blocks that have been decoded before the current block.
- the statistics generator may calculate a probability of appearance for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, sequence, and decoding unit.
- a video decoding apparatus is a statistical calculation for calculating a probability of occurrence based on decoding mode information obtained after decoding of a macroblock, slice, frame, or sequence of an image is completed. part; A coding order switching unit for switching and indexing a predetermined decoding mode order in response to the probability of the decoding mode information calculated by the statistical generator; And an image decoder which decodes a decoding mode for the image based on the order switched by the coding order switching unit when decoding the macroblock, the slice, the frame, or the sequence of the image.
- an image encoding / decoding method calculates an occurrence probability for each encoding mode of blocks that have been encoded before a current block, and corresponds to a probability for each encoding mode. Allocating an empty string or switching a preset sequence of encoding modes, thereby encoding the encoding mode of the current block; And calculating a probability of occurrence of each decoding mode of the blocks that have been decoded before the target block to be decoded, allocating an empty string or switching the order of a predetermined decoding mode corresponding to the probability of each decoding mode. And decoding the decoding mode of the target block received from the encoder.
- a method of encoding an image comprising: calculating a probability of occurrence of each encoding mode of blocks in which encoding is completed before a current block; Allocating and indexing an empty string corresponding to the calculated probabilities for each encoding mode; And encoding the encoding mode of the current block based on the allocated empty string when encoding the current block.
- the video encoding method further comprises the step of updating the allocated empty string by transmitting additional additional bits for the changed image when the characteristics of the image change.
- the appearance probability calculating step may calculate the appearance probability for the SKIP mode and the appearance probability for each split mode of the blocks that have been encoded before the current block.
- the appearance probability calculation step may calculate the appearance probability for each encoding mode of blocks in which encoding is completed before the current block for each unit of at least one of a frame, a sequence, and an encoding unit.
- the empty string assignment step may allocate an empty string based on at least one of a Huffman code, an arithmetic code, and an exponential Golomb code.
- a video encoding method comprising: calculating a probability of occurrence based on encoding mode information obtained after encoding of a macroblock, slice, frame, or sequence of an image is completed; Allocating and indexing an empty string corresponding to a probability of the calculated encoding mode information; And encoding an encoding mode for the image based on the allocated empty string when encoding a macroblock, slice, frame, or sequence of the image.
- the allocated empty string and indexing information may be included in at least one of PPS, SPS, and SH.
- a video encoding method comprising: calculating a probability of occurrence of each encoding mode of blocks in which encoding is completed before a current block; Switching and indexing a sequence of preset encoding modes corresponding to the calculated probabilities for each encoding mode; And encoding the encoding mode of the current block based on the order of switching by the order switching step when encoding the current block.
- the video encoding method may further include re-switching the switched order by the order switching step according to the characteristic of the changed image when the characteristic of the image is changed.
- the appearance probability calculating step may calculate the appearance probability for the SKIP mode and the appearance probability for each split mode of the blocks that have been encoded before the current block.
- the appearance probability calculation step may calculate the appearance probability for each encoding mode of blocks in which encoding is completed before the current block for each unit of at least one of a frame, a sequence, and an encoding unit.
- a method of encoding an image comprising: calculating a probability of occurrence based on encoding mode information obtained after encoding of a macroblock, slice, frame, or sequence of an image is completed; Switching and indexing a sequence of preset encoding modes in response to the probability of the calculated encoding mode information; And encoding the encoding mode for the image based on the switched order when encoding the macroblock, the slice, the frame, or the sequence of the image.
- the image decoding method may further include updating an allocated empty string by transmitting additional additional bits for the changed image when the characteristic of the image changes.
- the appearance probability calculation step it is possible to calculate the appearance probability for the SKIP mode, the appearance probability for each split mode of the blocks decoded before the current block.
- the appearance probability calculation step may calculate the appearance probability for each decoding mode of the blocks that have been decoded before the current block for each unit of at least one of a frame, a sequence, and a coding unit.
- a method of decoding an image comprising: calculating a probability of occurrence based on decoding mode information obtained after decoding of a macroblock, slice, frame, or sequence of an image is completed; Allocating and indexing an empty string corresponding to the probability of the calculated decoding mode information; And decoding the decoding mode for the macroblock, the slice, the frame or the sequence of the image based on the assigned empty string when decoding the macroblock, the slice, the frame or the sequence of the image.
- the empty string information used for decoding of the decoding mode may be included in at least one of PPS, SPS, and SH.
- the decoder calculates an appearance probability and corresponds to a bin corresponding to the probability of the calculated decoding mode information.
- the decoding mode is directly decoded using the empty string and the indexing information included in at least one of PPS, SPS, and SH, without going through the step of assigning and indexing a string.
- a method of decoding an image comprising: calculating a probability of occurrence of each decoding mode of blocks in which decoding is completed before a current block; Switching and indexing a predetermined order of decoding modes in response to the calculated probability for each decoding mode; And decoding the decoding mode according to the order of switching by the order switching step corresponding to the decoding mode for the current block when decoding the current block.
- the image decoding method may further include re-switching the order switched by the coding order switching unit according to the characteristic of the changed image when the characteristic of the image is changed.
- the appearance probability calculation step it is possible to calculate the appearance probability for the SKIP mode, the appearance probability for each split mode of the blocks decoded before the current block.
- the appearance probability calculation step may calculate the appearance probability for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, sequence, and decoding unit.
- a method of decoding an image comprising: calculating an appearance probability based on decoding mode information obtained after decoding of a macroblock, slice, frame, or sequence of an image is completed; Switching and indexing a predetermined order of decoding modes in response to the probability of the calculated decoding mode information; And decoding the decoding mode for the image based on the switched order when decoding the macroblock, the slice, the frame, or the sequence of the image.
- the probability of occurrence of an encoding mode or a decoding mode for a current block to be encoded or decoded is calculated, and an empty string is allocated or a sequence of preset encoding modes is switched,
- the transmission bits can be efficiently managed, thereby improving the compression performance and decoding performance of the image data.
- FIG. 1 is a diagram schematically illustrating an image encoding apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an example of probability information of an encoding mode by the image encoding apparatus of FIG. 1.
- FIG. 3 is a diagram illustrating an example of probability information of an encoding mode updated by the image encoding apparatus of FIG. 1.
- FIG. 4 is a diagram schematically illustrating an image decoding apparatus according to an embodiment of the present invention.
- FIG. 5 is a diagram schematically illustrating an image encoding apparatus according to another embodiment of the present invention.
- FIG. 6 is a diagram illustrating an example of an encoding mode sequence switched by the image encoding apparatus of FIG. 5.
- FIG. 7 is a diagram schematically illustrating an image decoding apparatus according to another embodiment of the present invention.
- FIG. 8 is a flowchart illustrating an image encoding method according to an embodiment of the present invention.
- FIG. 9 is a flowchart illustrating an image decoding method corresponding to the image encoding method of FIG. 8.
- FIG. 10 is a flowchart illustrating a video encoding method according to another embodiment of the present invention.
- FIG. 11 is a flowchart illustrating an image decoding method corresponding to the image encoding method of FIG. 10.
- FIG. 1 is a diagram schematically illustrating an image encoding apparatus according to an embodiment of the present invention.
- an image encoding apparatus may include a statistics generator 110, a bit allocator 120, an image encoder 130, and an exception processor 140.
- the statistical generator 110 calculates a probability of occurrence of each encoding mode of blocks in which encoding is completed before the current block. That is, the statistics generator 110 calculates entropy for each encoding mode based on the appearance probability of each encoding mode for blocks that are previously encoded of the current block to be encoded.
- the encoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, and each split mode for the block (eg, 16x8, 8x16, 8x8, 8x4, 4x8, 4x4, etc. in a 16x16 block). The probability of appearance).
- the statistical generator 110 may calculate an appearance probability for each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- the probability of occurrence of the SKIP mode for the SKIP mode, the 16x16 split mode, the 16x8 split mode, the 8x16 split mode, and the 8x8 split mode which are the encoding modes of the macroblock in macroblock units
- Probability, the probability of appearance of 16x16 partition mode, the probability of appearance of 16x8 partition mode, the probability of appearance of 8x16 partition mode, and the probability of appearance of 8x8 partition mode can be tabled.
- the statistics generator 110 obtains the encoding mode information obtained after the encoding of the macroblock, slice, frame or sequence of the image is completed. The probability of appearance can also be calculated based on.
- the statistics generator 110 is included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) for a macroblock, slice, frame, or sequence in which an image is encoded. The probability of occurrence can be calculated based on the empty string information.
- the PPS is header information indicating an encoding mode of the entire picture, and may include information such as an entropy encoding mode and an initial value of a quantization parameter in a picture unit.
- SPS represents header information containing information covering the entire sequence of the profile, level, and the like
- SH represents header information containing information covering encoding of the slice. That is, the statistics generator 110 may calculate a probability of appearance for a macroblock, slice, frame or sequence of an image based on such header information.
- the bit allocator 120 allocates and indexes a bin string as illustrated in FIG. 2, corresponding to the probability of each encoding mode calculated by the statistics generator 110.
- the empty string means a bit string by a set of binary digits.
- the bit allocation unit 120 allocates an empty string based on at least one of a Huffman code, an arithmetic code, and an exponential Golomb code, and the allocated empty string is transmitted to an image decoding apparatus through a bit string channel.
- the empty string information allocated by the bit allocator 120 may be included in at least one of PPS, SPS, and SH and transmitted to the image decoding apparatus.
- the image encoder 130 When encoding the current block, the image encoder 130 encodes an encoding mode of the current block based on the empty string allocated by the bit allocator 120. For example, when the encoding mode of the current block is the SKIP mode, the SKIP mode, which is the encoding mode of the current block, may be encoded based on an empty string corresponding to the SKIP mode allocated by the bit allocator 120.
- the exception processor 140 may transmit additional additional information instead of the probability information calculated by the statistics generator 110 to update the encoding mode indexing information. For example, when encoding an image using probability information of an encoding mode as illustrated in FIG. 2, an exception is required when the encoding mode indexing is changed suddenly due to a sudden change of a scene or a change in image characteristics.
- the processor 140 may transmit an additional additional bit for the changed image to update the empty string allocated by the bit allocator 120 as shown in FIG. 3.
- the exception processing unit 140 updates and allocates an empty string in reverse order of the probability of occurrence calculated by the statistics generating unit 110.
- the update by the exception processing unit 140 is illustrated. It is not limited and can be updated by various methods.
- FIG. 4 is a diagram schematically illustrating an image decoding apparatus according to an embodiment of the present invention.
- an image decoding apparatus may include a statistics generator 410, a bit allocator 420, an image decoder 430, and an exception processor 440.
- the statistics generator 410 calculates a probability of appearance of each decoding mode of blocks in which decoding is completed before the current block. That is, the statistics generator 410 calculates entropy for each decoding mode based on the appearance probability of each decoding mode for blocks previously decoded of the current block to be decoded.
- the decoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, an appearance probability of each partition mode for the block, and the like.
- the statistics generator 410 may calculate a probability of appearance for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, sequence, and coding unit.
- the SKIP mode, the 16x16 split mode, the 16x8 split mode, the 8x16 split mode, and the 8x8 split mode which are decoding modes of the macroblock in macroblock units.
- Probability of the SKIP mode, probability of 16x16 split mode, probability of 16x8 split mode, probability of 8x16 split mode, and probability of 8x8 split mode can be calculated and tabulated.
- the bit allocator 420 allocates and indexes an empty string corresponding to the probability of each decoding mode calculated by the statistics generator 110.
- the bit allocation unit 120 allocates an empty string based on at least one of the Huffman code, the arithmetic code, and the exponential Golomb code.
- the image decoder 430 decodes the decoding mode of the current block based on the empty string allocated by the bit allocator 420. That is, the image decoder 430 decodes the decoding mode corresponding to the empty string allocated by the bit allocator 420 based on the bit string information received through the bit string. For example, when the empty string corresponding to the SKIP mode is received through the bit string, the decoding mode corresponding to the empty string allocated by the bit allocation unit 420 and the received empty string corresponding to the decoding mode may be restored. Can be.
- the unit 430 may include the empty string information transmitted by being included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) of a macroblock, slice, frame, or sequence encoded by the encoder. It is also possible to decode the decoding mode directly.
- PPS picture parameter set
- SPS sequence parameter set
- SH slice header
- the exception processor 440 may update the decoding mode indexing information by transmitting additional additional information instead of the probability information calculated by the statistics generator 410. For example, when decoding an image using probability information of the decoding mode as illustrated in FIG. 2, when the decoding mode indexing needs to change abruptly due to a sudden scene change or a change in image characteristics of the image, an exception occurs.
- the processor 440 may update an empty string allocated by the bit allocator 420 as shown in FIG. 3 by transmitting additional additional bits for the changed image.
- FIG. 5 is a diagram schematically illustrating an image encoding apparatus according to another embodiment of the present invention.
- an image encoding apparatus may include a statistics generator 510, a coding order switching unit 520, an image encoder 530, and an exception processor 540. .
- the statistics generator 510 calculates a probability of occurrence of each encoding mode of blocks in which encoding is completed before the current block. That is, the statistics generator 510 calculates entropy for each encoding mode based on the appearance probability of each encoding mode for blocks that have been encoded before the current block to be encoded.
- the encoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, an appearance probability of each split mode for the block, and the like.
- the statistics generator 510 may calculate a probability of occurrence for each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- the statistics generator 510 encodes encoding mode information obtained after encoding of a macroblock, slice, frame, or sequence of an image is completed, instead of calculating an appearance probability of each encoding mode of blocks that are encoded before the current block. The probability of appearance can also be calculated based on.
- the statistics generator 510 may be included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) for a macroblock, slice, frame, or sequence in which an image is encoded. The probability of occurrence can be calculated based on the empty string information.
- the coding order switching unit 520 switches and indexes the order of the coding modes in response to the probability of the coding mode calculated by the statistics generator 510. That is, unlike the case of allocating bits for indexing the encoding mode described with reference to FIG. 1, only the sequence of encoding modes may be switched and indexed without changing the predetermined allocated bits of the encoding mode. For example, as shown in FIG. 2, only the order of encoding modes may be switched and indexed for the fixedly allocated bit as shown in FIG. 6.
- the coding mode information switched by the coding order switching unit 520 may be included in at least one of PPS, SPS, and SH and transmitted to the image decoder.
- the image encoder 530 When encoding the current block, the image encoder 530 encodes the encoding mode of the current block based on the indexed order of switching by the coding order switching unit 520.
- the exception processor 540 When the characteristic of the image is changed, the exception processor 540 re-switches the order of switching by the coding order switching unit 520 according to the characteristic of the changed image. That is, in case of encoding an image, when the encoding mode indexing is to be changed suddenly due to a sudden scene change or an image characteristic change of the image, the exception processing unit 540 is switched by the coding order switching unit 520 and indexing. It is possible to index by re-switching the order of the coded modes.
- FIG. 7 is a diagram schematically illustrating an image decoding apparatus according to another embodiment of the present invention.
- an image decoding apparatus may include a statistics generator 710, a coding order switching unit 720, an image decoder 730, and an exception processor 740. .
- the statistics generator 710 calculates a probability of appearance of each decoding mode of blocks in which decoding is completed before the current block. That is, the statistics generator 710 calculates entropy for each decoding mode based on the appearance probability of each decoding mode for blocks previously decoded of the current block to be decoded.
- the decoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, an appearance probability of each split mode for the block, and the like.
- the statistics generator 710 may calculate an appearance probability for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, a sequence, and a coding unit.
- the coding order switching unit 720 switches and indexes the decoding mode order in response to the probability of the decoding mode calculated by the statistics generator 710. That is, unlike the case of allocating bits for indexing of the decoding mode, the indexes may be switched by switching only the order of the decoding modes without changing the predetermined and allocated bits of the decoding mode.
- the image decoder 730 decodes the decoding mode of the current block based on the indexed order of switching by the coding order switching unit 720.
- the statistics generator 710 calculates the probability of appearance for each decoding mode of the blocks that have been decoded before the current block, and the coding order switching unit 720 switches the order of the decoding mode in response to the appearance probability.
- the image decoder 730 may include a bin included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) of a macroblock, slice, frame, or sequence encoded by the encoder. It is also possible to decode the decoding mode using the string information directly.
- the exception processor 740 When the characteristic of the image is changed, the exception processor 740 re-switches the order of switching by the coding order switching unit 720 according to the characteristic of the changed image. That is, when decoding an image, when the decoding mode indexing needs to change abruptly due to a sudden scene change or a change in image characteristics of the image, the exception processing unit 740 is switched by the coding order switching unit 720 and indexing. The order of the decoded modes may be re-switched and indexed.
- the statistics generator 110 calculates a probability of occurrence of each encoding mode of blocks in which encoding is completed before the current block (S801).
- the encoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, an appearance probability of each split mode for the block, and the like.
- the statistics generator 110 may calculate an appearance probability for each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- the statistics generator 110 obtains the encoding mode information obtained after the encoding of the macroblock, slice, frame or sequence of the image is completed. The probability of appearance can also be calculated based on.
- the statistics generator 110 is included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) for a macroblock, slice, frame, or sequence in which an image is encoded. The probability of occurrence can be calculated based on the empty string information.
- the bit allocator 120 allocates and indexes an empty string as illustrated in FIG. 2 in response to the probability of each encoding mode calculated by the statistics generator 110 (S803).
- the bit allocation unit 120 allocates an empty string based on at least one of a Huffman code, an arithmetic code, and an exponential Golomb code, and the allocated empty string is transmitted to an image decoding apparatus through a bit string channel.
- the empty string information allocated by the bit allocator 120 may be included in at least one of PPS, SPS, and SH and transmitted to the image decoding apparatus.
- the exception processing unit 140 transmits an additional additional bit for the changed image or sends a bit of a specific part.
- the empty string allocated by the bit allocator 120 may be updated in operation S807.
- the image encoder 130 When encoding the current block, the image encoder 130 encodes an encoding mode of the current block based on the empty string allocated by the bit allocator 120 or the empty string updated by the exception processor 140 (S809). ).
- FIG. 9 is a flowchart illustrating an image decoding method corresponding to the image encoding method of FIG. 8.
- the statistics generator 410 calculates a probability of occurrence of each decoding mode of blocks in which decoding is completed before the current block (S901). That is, the statistics generator 410 calculates entropy for each decoding mode based on the appearance probability of each decoding mode for blocks previously decoded of the current block to be decoded.
- the decoding mode for the block may include a probability of occurrence of information indicating that the block is a SKIP mode, an appearance probability of each partition mode for the block, and the like.
- the statistics generator 410 may calculate a probability of appearance for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, sequence, and coding unit.
- the bit allocator 420 allocates and indexes an empty string corresponding to the probability of each decoding mode calculated by the statistics generator 110 (S903).
- the bit allocation unit 120 allocates an empty string based on at least one of the Huffman code, the arithmetic code, and the exponential Golomb code.
- the exception processor 440 When decoding the index using the probability information of the decoding mode when the decoding mode indexing is suddenly changed due to a sudden scene change or image characteristics of the image (S905), the exception processor 440 is applied to the changed image An additional additional bit may be transmitted or an empty string of a specific portion may be updated to update the empty string allocated by the bit allocator 420 (S907).
- the image decoder 430 decodes the decoding mode of the current block based on the empty string allocated by the bit allocator 420 (S909). That is, the image decoder 430 decodes the decoding mode corresponding to the empty string allocated by the bit allocator 420 based on the bit string information received through the bit string.
- image decoding is performed instead of the statistics generator 410 calculating the probability of occurrence of each decoding mode of the blocks that have been decoded before the current block, and the bit allocator 420 assigning an empty string corresponding to the probability of appearance.
- the unit 430 may include the empty string information transmitted by being included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) of a macroblock, slice, frame, or sequence encoded by the encoder. It is also possible to decode the decoding mode directly.
- PPS picture parameter set
- SPS sequence parameter set
- SH slice header
- FIG. 10 is a flowchart illustrating a video encoding method according to another embodiment of the present invention.
- the statistical generator 510 calculates an appearance probability of each encoding mode of blocks in which encoding is completed before the current block (S1001). That is, the statistics generator 510 calculates entropy for each encoding mode based on the appearance probability of each encoding mode for blocks that have been encoded before the current block to be encoded. In this case, the statistics generator 510 may calculate a probability of occurrence for each encoding mode of blocks in which encoding is completed before the current block for at least one unit of a frame, a sequence, and an encoding unit.
- the statistics generator 510 encodes encoding mode information obtained after encoding of a macroblock, slice, frame, or sequence of an image is completed, instead of calculating an appearance probability of each encoding mode of blocks that are encoded before the current block. The probability of appearance can also be calculated based on.
- the statistics generator 510 may be included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) for a macroblock, slice, frame, or sequence in which an image is encoded. The probability of occurrence can be calculated based on the empty string information.
- the coding order switching unit 520 switches, rearranges, and indexes the order of the encoding modes in response to the probability of the encoding mode calculated by the statistics generator 510 (S1003). That is, the coding order switching unit 520 may switch, rearrange, and index only the order of the encoding modes without changing the predetermined allocated bits of the encoding mode.
- the coding mode information switched by the coding order switching unit 520 may be included in at least one of PPS, SPS, and SH and transmitted to the image decoder.
- the exception processor 540 When the characteristic of the image is changed (S1005), the exception processor 540 re-switches the order switched by the coding order switching unit 520 according to the characteristic of the changed image (S1007). That is, in case of encoding an image, when the encoding mode indexing is to be changed suddenly due to a sudden scene change or an image characteristic change of the image, the exception processing unit 540 is switched by the coding order switching unit 520 and indexing. It is possible to index by re-switching the order of the coded modes.
- the image encoder 530 When encoding the current block, the image encoder 530 encodes the encoding mode of the current block based on the indexed order of switching by the coding order switching unit 520 (S1009).
- FIG. 11 is a flowchart illustrating an image decoding method corresponding to the image encoding method of FIG. 10.
- the statistics generator 710 calculates a probability of occurrence of each decoding mode of blocks in which decoding is completed before the current block (S1101). That is, the statistics generator 710 calculates entropy for each decoding mode based on the appearance probability of each decoding mode for blocks previously decoded of the current block to be decoded. In this case, the statistics generator 710 may calculate an appearance probability for each decoding mode of blocks in which decoding is completed before the current block for at least one unit of a frame, a sequence, and a coding unit.
- the coding order switching unit 720 switches and indexes the order of decoding modes in response to the probability of the decoding mode calculated by the statistics generator 710 (S1103). That is, unlike the case of allocating bits for indexing of the decoding mode, the indexes may be switched by switching only the order of the decoding modes without changing the predetermined and allocated bits of the decoding mode.
- the order of switching by the coding order switching unit 720 is re-switched according to the characteristic of the changed image (S1107). That is, when decoding an image, when the decoding mode indexing needs to change abruptly due to a sudden scene change or an image characteristic change of the image, the exception processing unit 740 is switched by the coding order switching unit 720 to index the index. The order of the decoded modes may be re-switched and indexed.
- the image decoder 730 decodes the decoding mode of the current block based on the indexed order of switching by the coding order switch 720 (S1109).
- the statistics generator 710 calculates the probability of appearance for each decoding mode of the blocks that have been decoded before the current block, and the coding order switching unit 720 switches the order of the decoding mode in response to the appearance probability.
- the image decoder 730 may include a bin included in at least one of a picture parameter set (PPS), a sequence parameter set (SPS), and a slice header (SH) of a macroblock, slice, frame, or sequence encoded by the encoder. It is also possible to decode the decoding mode using the string information directly.
- the embodiment of the present invention calculates the probability of occurrence of an encoding mode or a decoding mode for a current block to be encoded or decoded, and allocates an empty string or sets a predetermined sequence of encoding modes accordingly.
- Switching efficiently manages the transmission bit by changing the indexing order or variable length code of the encoding mode or the decoding mode according to the characteristics of the image, thereby improving the compression performance and decoding performance of the image data It is a very useful invention to generate.
Abstract
Description
Claims (47)
- 영상 부호화/복호화 장치에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하고, 상기 각 부호화 모드에 대한 확률에 대응하여 빈 스트링(Bin String)을 할당하거나 기 설정된 부호화 모드의 순서를 스위칭하며, 그에 따라 상기 현재블록의 부호화 모드를 부호화하는 영상 부호화기; 및복호화할 대상블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하고, 상기 각 복호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하거나 기 설정된 복호화 모드의 순서를 스위칭하며, 그에 따라 상기 영상 부호화기로부터 수신된 상기 대상블록의 복호화 모드를 복호화하는 영상 복호화기를 포함하는 것을 특징으로 하는 영상 부호화/복호화 장치.
- 영상 부호화 장치에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 통계 생성부;상기 통계 생성부에 의해 계산된 상기 각 부호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 비트 할당부; 및상기 현재블록을 부호화 시, 상기 비트 할당부에 의해 할당된 빈 스트링에 기초하여 상기 현재블록의 부호화 모드를 부호화하는 영상 부호화부를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 2항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상에 대한 부가적인 추가 비트를 전송하여 상기 비트 할당부에 의해 할당된 빈 스트링을 갱신하는 예외 처리부를 더 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 2항에 있어서,상기 통계 생성부는,상기 현재블록 이전에 부호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 제 2항에 있어서,상기 통계 생성부는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 제 2항에 있어서,상기 비트 할당부는,허프만 코드, 산술 코드, 지수 골롬(Exponential Golomb) 코드 중의 적어도 하나에 기초하여 빈 스트링을 할당하는 것을 특징으로 하는 영상 부호화 장치.
- 영상 부호화 장치에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 부호화가 완료된 후 얻어지는 부호화 모드 정보에 기초하여 출현확률을 계산하는 통계 계산부;상기 통계 생성부에 의해 계산된 상기 부호화 모드 정보에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 비트 할당부; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 부호화 시, 상기 비트 할당부에 의해 할당된 빈 스트링에 기초하여 상기 영상에 대한 부호화 모드를 부호화하는 영상 부호화부를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 7항에 있어서,상기 통계 계산부는,PPS(Picture Parameter Set), SPS(Sequence Parameter Set), SH(Slice Header) 중의 적어도 하나에 포함된 부호화 모드 정보에 기초하여 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 영상 부호화 장치에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 통계 생성부;상기 통계 생성부에 의해 계산된 상기 각 부호화 모드에 대한 확률에 대응하여 기 설정된 부호화 모드의 순서를 스위칭하고 인덱싱하는 코딩 순서 스위칭부; 및상기 현재블록을 부호화 시, 상기 코딩 순서 스위칭부에 의해 스위칭된 순서에 기초하여 상기 현재블록의 부호화 모드를 부호화하는 영상 부호화부를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 9항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상의 특성에 따라 상기 코딩 순서 스위칭부에 의해 스위칭된 순서를 재 스위칭하는 예외 처리부를 더 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 9항에 있어서,상기 통계 생성부는,상기 현재블록 이전에 부호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 제 9항에 있어서,상기 통계 생성부는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 영상 부호화 장치에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 부호화가 완료된 후 얻어지는 부호화 모드 정보에 기초하여 출현확률을 계산하는 통계 계산부;상기 통계 생성부에 의해 계산된 상기 부호화 모드 정보에 대한 확률에 대응하여 기 설정된 부호화 모드의 순서를 스위칭하고 인덱싱하는 코딩 순서 스위칭부; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 부호화 시, 상기 코딩 순서 스위칭부에 의해 스위칭된 순서에 기초하여 상기 영상에 대한 부호화 모드를 부호화하는 영상 부호화부를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 13항에 있어서,상기 통계 계산부는,PPS(Picture Parameter Set), SPS(Sequence Parameter Set), SH(Slice Header) 중의 적어도 하나에 포함된 부호화 모드 정보에 기초하여 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 장치.
- 영상 복호화 장치에 있어서,현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 통계 생성부;상기 통계 생성부에 의해 계산된 상기 각 복호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 비트 할당부; 및상기 현재블록을 복호화 시, 상기 비트 할당부에 의해 할당된 빈 스트링에 기초하여 상기 현재블록의 복호화 모드를 복호화하는 영상 복호화부를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 제 15항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상에 대한 부가적인 추가 비트를 전송하여 상기 비트 할당부에 의해 할당된 빈 스트링을 갱신하는 예외 처리부를 더 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 제 15항에 있어서,상기 통계 생성부는,상기 현재블록 이전에 복호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 장치.
- 제 15항에 있어서,상기 통계 생성부는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 복호화 장치에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 복호화가 완료된 후 얻어지는 복호화 모드 정보에 기초하여 출현확률을 계산하는 통계 계산부;상기 통계 생성부에 의해 계산된 상기 복호화 모드 정보에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 비트 할당부; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 복호화 시, 상기 비트 할당부에 의해 할당된 빈 스트링에 기초하여 상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스에 대한 복호화 모드를 복호화하는 영상 복호화부를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 복호화 장치에 있어서,현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 통계 생성부;상기 통계 생성부에 의해 계산된 상기 각 복호화 모드에 대한 확률에 대응하여 기 설정된 복호화 모드의 순서를 스위칭하고 인덱싱하는 코딩 순서 스위칭부; 및상기 현재블록을 복호화 시, 상기 현재블록에 대한 복호화 모드에 대응하여 상기 코딩 순서 스위칭부에 의해 스위칭된 순서에 따라 복호화 모드를 인덱싱하여 복호화하는 영상 부호화부를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 제 20항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상의 특성에 따라 상기 코딩 순서 스위칭부에 의해 스위칭된 순서를 재 스위칭하는 예외 처리부를 더 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 제 20항에 있어서,상기 통계 생성부는,상기 현재블록 이전에 복호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 장치.
- 제 20항에 있어서,상기 통계 생성부는,프레임, 시퀀스, 복호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 복호화 장치에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 복호화가 완료된 후 얻어지는 복호화 모드 정보에 기초하여 출현확률을 계산하는 통계 계산부;상기 통계 생성부에 의해 계산된 상기 복호화 모드 정보에 대한 확률에 대응하여 기 설정된 복호화 모드의 순서를 스위칭하고 인덱싱하는 코딩 순서 스위칭부; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 복호화 시, 상기 코딩 순서 스위칭부에 의해 스위칭된 순서에 기초하여 상기 영상에 대한 복호화 모드를 복호화하는 영상 복호화부를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 부호화/복호화 방법에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하고, 상기 각 부호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하거나 기 설정된 부호화 모드의 순서를 스위칭하며, 그에 따라 상기 현재블록의 부호화 모드를 부호화하는 단계; 및복호화할 대상블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하고, 상기 각 복호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하거나 기 설정된 복호화 모드의 순서를 스위칭하며, 그에 따라 상기 영상 부호화기로부터 수신된 상기 대상블록의 복호화 모드를 복호화하는 단계를 포함하는 것을 특징으로 하는 영상 부호화/복호화 방법.
- 영상 부호화 방법에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 단계;계산된 상기 각 부호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 단계; 및상기 현재블록을 부호화 시, 상기 할당된 빈 스트링에 기초하여 상기 현재블록의 부호화 모드를 부호화하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 26항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상에 대한 부가적인 추가 비트를 전송하여 상기 할당된 빈 스트링을 갱신하는 단계를 더 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 26항에 있어서,상기 출현확률 계산단계는,상기 현재블록 이전에 부호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 방법.
- 제 26항에 있어서,상기 출현확률 계산단계는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 방법.
- 제 26항에 있어서,상기 빈 스트링 할당단계는,허프만 코드, 산술 코드, 지수 골롬(Exponential Golomb) 코드 중의 적어도 하나에 기초하여 빈 스트링을 할당하는 것을 특징으로 하는 영상 부호화 방법.
- 영상 부호화 방법에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 부호화가 완료된 후 얻어지는 부호화 모드 정보에 기초하여 출현확률을 계산하는 단계;계산된 상기 부호화 모드 정보에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 단계; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 부호화 시, 상기 할당된 빈 스트링에 기초하여 상기 영상에 대한 부호화 모드를 부호화하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 31항에 있어서,상기 출현확률 계산단계는,PPS(Picture Parameter Set), SPS(Sequence Parameter Set), SH(Slice Header) 중의 적어도 하나에 포함된 부호화 정보에 기초하여 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 방법.
- 영상 부호화 방법에 있어서,현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 단계;계산된 상기 각 부호화 모드에 대한 확률에 대응하여 기 설정된 부호화 모드의 순서를 스위칭하고 인덱싱하는 단계; 및상기 현재블록을 부호화 시, 상기 순서 스위칭단계에 의해 스위칭된 순서에 기초하여 상기 현재블록의 부호화 모드를 부호화하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 33항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상의 특성에 따라 상기 순서 스위칭단계에 의해 스위칭된 순서를 재 스위칭하는 단계를 더 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 33항에 있어서,상기 출현확률 계산단계는,상기 현재블록 이전에 부호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 방법.
- 제 33항에 있어서,상기 출현확률 계산단계는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 부호화가 완료된 블록들의 각 부호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 부호화 방법.
- 영상 부호화 방법에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 부호화가 완료된 후 얻어지는 부호화 모드 정보에 기초하여 출현확률을 계산하는 단계;계산된 상기 부호화 모드 정보에 대한 확률에 대응하여 기 설정된 부호화 모드의 순서를 스위칭하고 인덱싱하는 단계; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 부호화 시, 상기 스위칭된 순서에 기초하여 상기 영상에 대한 부호화 모드를 부호화하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 영상 복호화 방법에 있어서,현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 단계;계산된 상기 각 복호화 모드에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 단계; 및상기 현재블록을 복호화 시, 상기 할당된 빈 스트링에 기초하여 상기 현재블록의 복호화 모드를 복호화하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 38항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상에 대한 부가적인 추가 비트를 전송하여 상기 할당된 빈 스트링을 갱신하는 단계를 더 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 38항에 있어서,상기 출현확률 계산단계는,상기 현재블록 이전에 복호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 방법.
- 제 38항에 있어서,상기 출현확률 계산단계는,프레임, 시퀀스, 부호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 방법.
- 영상 복호화 방법에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 복호화가 완료된 후 얻어지는 복호화 모드 정보에 기초하여 출현확률을 계산하는 단계;계산된 상기 복호화 모드 정보에 대한 확률에 대응하여 빈 스트링을 할당하고 인덱싱하는 단계; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 복호화 시, 상기 할당된 빈 스트링에 기초하여 상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스에 대한 복호화 모드를 복호화하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 영상 복호화 방법에 있어서,현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 단계;계산된 상기 각 복호화 모드에 대한 확률에 대응하여 기 설정된 복호화 모드의 순서를 스위칭하고 인덱싱하는 단계; 및상기 현재블록을 복호화 시, 상기 순서 스위칭단계에 의해 스위칭된 순서에 기초하여 상기 현재블록의 복호화 모드를 복호화하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 43항에 있어서,영상의 특성이 변화되는 경우, 변화되는 상기 영상의 특성에 따라 상기 코딩 순서 스위칭부에 의해 스위칭된 순서를 재 스위칭하는 단계를 더 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 43항에 있어서,상기 출현확률 계산단계는,상기 현재블록 이전에 복호화가 완료된 블록들의 SKIP 모드에 대한 출현확률, 각 분할모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 방법.
- 제 43항에 있어서,상기 출현확률 계산단계는,프레임, 시퀀스, 복호화 유닛 중의 적어도 하나의 단위마다 상기 현재블록 이전에 복호화가 완료된 블록들의 각 복호화 모드에 대한 출현확률을 계산하는 것을 특징으로 하는 영상 복호화 방법.
- 영상 복호화 방법에 있어서,영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스의 복호화가 완료된 후 얻어지는 복호화 모드 정보에 기초하여 출현확률을 계산하는 단계;계산된 상기 복호화 모드 정보에 대한 확률에 대응하여 기 설정된 복호화 모드의 순서를 스위칭하고 인덱싱하는 단계; 및상기 영상의 매크로블록, 슬라이스, 프레임 또는 시퀀스를 복호화 시, 상기 스위칭된 순서에 기초하여 상기 영상에 대한 복호화 모드를 복호화하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
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US13/816,087 US20130195176A1 (en) | 2010-08-10 | 2011-08-09 | Method and device for encoding/decoding image using adaptive encoding/decoding mode indexing method |
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KR1020100076790A KR20120014676A (ko) | 2010-08-10 | 2010-08-10 | 적응적 부호화/복호화 모드 인덱싱 기법을 이용한 영상 부호화/복호화 장치 및 방법 |
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KR20000073634A (ko) * | 1999-05-13 | 2000-12-05 | 구자홍 | 허프만 테이블의 재배열에 의한 영상 부호화 방법 및 영상 부호화기 및 복호화기 |
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JP2008177630A (ja) * | 2007-01-16 | 2008-07-31 | Victor Co Of Japan Ltd | 動きベクトル検出装置 |
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JP3975629B2 (ja) * | 1999-12-16 | 2007-09-12 | ソニー株式会社 | 画像復号装置及び画像復号方法 |
US6765964B1 (en) * | 2000-12-06 | 2004-07-20 | Realnetworks, Inc. | System and method for intracoding video data |
EP1404133A4 (en) * | 2001-06-29 | 2010-04-21 | Ntt Docomo Inc | IMAGE ENCODER, IMAGE DECODER, IMAGE ENCODING METHOD, AND IMAGE DECODING METHOD |
EP2819411B1 (en) * | 2001-09-14 | 2018-08-29 | NTT DoCoMo, Inc. | Coding method and decoding method |
WO2003043347A1 (en) * | 2001-11-16 | 2003-05-22 | Ntt Docomo, Inc. | Image encoding method, image decoding method, image encoder, image decode, program, computer data signal, and image transmission system |
US7720187B2 (en) * | 2003-03-03 | 2010-05-18 | Panasonic Corporation | Methods and apparatus for reducing discrete power spectral density components of signals transmitted in wideband communications systems |
WO2005041420A1 (ja) * | 2003-10-29 | 2005-05-06 | Nec Corporation | 算術符号の復号器または符号化器と逆2値化変換器または2値化変換器との間に中間バッファが挿入された復号装置または符号化装置 |
US7599435B2 (en) * | 2004-01-30 | 2009-10-06 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Video frame encoding and decoding |
US20060176953A1 (en) * | 2005-02-04 | 2006-08-10 | Nader Mohsenian | Method and system for video encoding with rate control |
KR100867995B1 (ko) * | 2006-01-07 | 2008-11-10 | 한국전자통신연구원 | 동영상 데이터 인코딩/디코딩 방법 및 그 장치 |
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KR20000073634A (ko) * | 1999-05-13 | 2000-12-05 | 구자홍 | 허프만 테이블의 재배열에 의한 영상 부호화 방법 및 영상 부호화기 및 복호화기 |
JP2006101527A (ja) * | 2004-09-28 | 2006-04-13 | Thomson Licensing | 画像のシーケンスの符号化の方法及び装置 |
JP2008177630A (ja) * | 2007-01-16 | 2008-07-31 | Victor Co Of Japan Ltd | 動きベクトル検出装置 |
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