WO2013048151A1 - 제한된 오프셋 보상 및 루프 필터를 기반으로 하는 영상 부호화 및 복호화 방법 및 그 장치 - Google Patents
제한된 오프셋 보상 및 루프 필터를 기반으로 하는 영상 부호화 및 복호화 방법 및 그 장치 Download PDFInfo
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- 230000006835 compression Effects 0.000 description 4
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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
- H04N19/117—Filters, e.g. for pre-processing or post-processing
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- H—ELECTRICITY
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/189—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
- H04N19/196—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters
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- 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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- 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
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/70—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
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- H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
Definitions
- the present invention relates to a digital image, and more particularly, to a method and apparatus for image encoding and decoding based on limited offset compensation and loop filters.
- Image compression techniques include an inter prediction technique that predicts pixel values included in a current picture from a previous and / or subsequent picture in time, and an intra predictor of pixel values included in a current picture using pixel information in the current picture.
- (intra) prediction technique weight prediction technique to prevent deterioration of image quality due to lighting changes, entropy encoding technique for assigning short codes to symbols with high appearance frequency and long codes to symbols with low appearance frequency, etc.
- entropy encoding technique for assigning short codes to symbols with high appearance frequency and long codes to symbols with low appearance frequency, etc.
- an offset compensation or loop filter may be applied to minimize the difference between the original image and the reconstructed image.
- an offset may be obtained by calculating an error of a pixel value between an original image and a reconstructed image, and applied to the reconstructed image to minimize distortion with the original image.
- a filter coefficient based on a Wiener filter for minimizing an error between an original image and a reconstructed image may be derived and then applied to the reconstructed image to minimize distortion with the original image.
- the compressed video bit stream may be transmitted through an error prone network channel.
- the conventional offset compensation or loop filter since the conventional offset compensation or loop filter has no countermeasure when an error occurs in the compressed video bit stream, the error may be propagated temporally or spatially by the offset compensation or loop filter. Therefore, the conventional offset compensation or loop filter may greatly degrade the quality of the reconstructed image, and may not be able to decode the compressed image bit stream.
- An object of the present invention is to provide a method and apparatus for encoding and decoding an image based on limited offset compensation and filtering.
- the present invention provides a method for restricting the application of offset compensation or loop filters in image encoding and decoding by using encoding parameters of at least one of a pixel adaptive offset compensation or loop filter target block and a neighboring block.
- an image decoding method includes a sequence, a picture, a frame, a slice, a coding unit (CU), a prediction unit (PU), and a transform unit (TU).
- a limited offset compensation indicator indicating from the encoder whether at least one of the at least one supports limited offset compensation
- the SAO compensation indicator indicating whether to perform sample adaptive offset (SAO) compensation.
- receiving from an encoder receiving an SAO parameter from the encoder, and performing pixel adaptive offset compensation on a pixel of a reconstructed image based on the SAO compensation indicator and the SAO parameter.
- an image decoding method includes a sequence, a picture, a frame, a slice, a coding unit (CU), a prediction unit (PU), and a transform unit (TU). Transmitting a limited offset compensation indicator indicating to the decoder whether at least one of the at least one supports limited offset compensation, wherein the SAO compensation indicator indicating whether to perform sample adaptive offset (SAO) compensation. Transmitting to the decoder, transmitting SAO parameters to the decoder, and performing pixel adaptive offset compensation on the pixels of the reconstructed image based on the SAO compensation indicator and the SAO parameters.
- SAO sample adaptive offset
- a video encoding method includes a sequence, a picture, a frame, a slice, a coding unit (CU), a prediction unit (PU), and a transform unit (TU). Transmitting a limited loop filter indicator indicating to the decoder whether at least one of the at least one supports the application of the restricted loop filter, and an ALF application indicator indicating whether to apply an adaptive loop filter (ALF). Transmitting to the decoder, transmitting an ALF parameter to the decoder, and applying the ALF to the pixel of the reconstructed image based on the ALF application indicator and the ALF parameter.
- ALF adaptive loop filter
- An offset compensation or loop filter may be applied to be robust to errors in image encoding and decoding.
- FIG. 1 is a block diagram illustrating a configuration of an image encoding apparatus according to an embodiment.
- FIG. 2 is a block diagram illustrating a configuration of an image decoding apparatus according to an embodiment.
- FIG. 3 shows an embodiment of a proposed image encoding method.
- FIG. 5 illustrates a case in which an offset type is determined in an edge offset type by using encoding parameters in the proposed image encoding method.
- FIG. 6 shows an embodiment of a proposed image decoding method.
- FIG. 7 shows another embodiment of a proposed video encoding method.
- FIG. 8 shows an example of a filter shape determined by an encoder in the proposed image encoding method.
- FIG. 9 illustrates a case of classifying a filter based on a BA method by using an encoding parameter in the proposed image encoding method.
- FIG. 10 illustrates an example of applying ALF using an encoding parameter in the proposed image encoding method.
- FIG. 11 shows an embodiment of a proposed image decoding method.
- FIG. 12 shows an example of a filter shape used in the proposed image decoding method.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- each component shown in the embodiments of the present invention are shown independently to represent different characteristic functions, and do not mean that each component is made of separate hardware or one software component unit.
- each component is included in each component for convenience of description, and at least two of the components may be combined into one component, or one component may be divided into a plurality of components to perform a function.
- Integrated and separate embodiments of the components are also included within the scope of the present invention without departing from the spirit of the invention.
- the components may not be essential components for performing essential functions in the present invention, but may be optional components for improving performance.
- the present invention can be implemented including only the components essential for implementing the essentials of the present invention except for the components used for improving performance, and the structure including only the essential components except for the optional components used for improving performance. Also included in the scope of the present invention.
- FIG. 1 is a block diagram illustrating an image encoding apparatus according to an embodiment of the present invention.
- the image encoding apparatus 100 may include a motion predictor 110, a motion compensator 115, an intra predictor 120, a subtractor 125, a transformer 130, and a quantizer 135. ), An entropy encoder 140, an inverse quantizer 145, an inverse transformer 150, an adder 155, a filter 160, and a reference image buffer 165.
- the image encoding apparatus 100 may encode the input image in an intra mode or an inter mode and output a bit stream.
- the prediction may be performed by the intra predictor 120
- the prediction may be performed by the motion predictor 110, the motion compensator 115, and the like.
- the image encoding apparatus 100 may generate a prediction block for an input block of an input image and then encode a difference between the input block and the prediction block.
- the intra predictor 120 may generate a predictive block by performing spatial prediction using pixel values of blocks that are already encoded around the current block.
- the motion predictor 110 may obtain a motion vector by searching for a region that best matches an input block in the reference image stored in the reference image buffer 170 during the motion prediction process.
- the motion compensator 115 may generate a prediction block by performing motion compensation using the motion vector and the reference image stored in the reference image buffer 165.
- the subtractor 125 may generate a residual block by the difference between the input block and the generated prediction block.
- the transform unit 130 may output a transform coefficient by performing a transform on the residual block.
- the residual signal may mean a difference between the original signal and the prediction signal, and may also mean a signal in which the difference between the original signal and the prediction signal is converted or a signal in which the difference between the original signal and the prediction signal is converted and quantized. It may be.
- the residual signal may be referred to as a residual block in block units.
- the quantization unit 135 may output a quantized coefficient obtained by quantizing the transform coefficients according to the quantization parameter.
- the entropy encoder 140 may entropy-encode the symbols corresponding to the values calculated by the quantizer 135 or the encoding parameter values calculated in the encoding process according to a probability distribution and output a bit stream.
- the compression performance of image encoding may be improved by assigning a small number of bits to a symbol having a high occurrence probability and a large number of bits to a symbol having a low occurrence probability.
- Encoding methods such as context-adaptive variable length coding (CAVLC) and context-adaptive binary arithmetic coding (CABAC) may be used for entropy encoding.
- CAVLC context-adaptive variable length coding
- CABAC context-adaptive binary arithmetic coding
- the entropy encoder 140 may perform entropy encoding using a variable length coding (VLC) table.
- VLC variable length coding
- the entropy encoder 145 derives the binarization method of the target symbol and the probability model of the target symbol / bin, and then performs entropy encoding using the derived binarization method or the probability model. It may be.
- the quantized coefficient may be inversely quantized by the inverse quantizer 145 and inversely transformed by the inverse transformer 150.
- the adder 155 may generate a reconstruction block by using the prediction block and the inverse transformed quantization coefficient.
- the filter unit 160 may apply at least one or more of a deblocking filter, a sample adaptive offset (SAO), and an adaptive loop filter (ALF) to the reconstructed block or the reconstructed picture.
- the reconstruction block that has passed through the filter unit 160 may be stored in the reference image buffer 165.
- FIG. 2 is a block diagram illustrating an image decoding apparatus according to an embodiment of the present invention.
- the image decoding apparatus 200 may include an entropy decoder 210, an inverse quantizer 220, an inverse transformer 230, an intra predictor 240, a motion compensator 250, and a filter. 260, a reference image buffer 270, and an adder 280.
- the image decoding apparatus 200 may receive a bit stream output from the encoder and perform decoding in an intra mode or an inter mode, and output a reconstructed image, that is, a reconstructed image.
- the prediction may be performed by the intra predictor 240
- the prediction may be performed by the motion compensator 250.
- the image decoding apparatus 200 may generate a reconstructed block, that is, a reconstructed block by obtaining a residual block reconstructed from the received bit stream, generating a prediction block, and adding the reconstructed residual block and the prediction block.
- the entropy decoder 210 may entropy decode the input bit stream according to a probability distribution to generate symbols in the form of quantized coefficients.
- the entropy decoding method may be performed corresponding to the entropy encoding method described above.
- the quantized coefficients are inversely quantized by the inverse quantizer 220 and inversely transformed by the inverse transformer 230, and a residual block may be generated as a result of inverse quantization / inverse transformation of the quantized coefficients.
- the intra predictor 240 may generate a predictive block by performing spatial prediction using pixel values of blocks that are already encoded around the current block.
- the motion compensator 250 may generate a prediction block by performing motion compensation using the motion vector and the reference image stored in the reference image buffer 270.
- the adder 280 may generate a reconstruction block based on the residual block and the prediction block.
- the filter unit 260 may apply at least one or more of the deblocking filter, SAO, and ALF to the reconstruction block.
- the filter unit 260 outputs the reconstructed image, that is, the reconstructed image.
- the reconstructed picture may be stored in the reference picture buffer 270 to be used for inter prediction.
- Constrained intra prediction is a technique for making it robust to errors in image encoding or image decoding.
- the CIP technique does not use the reconstructed pixel region of the periphery prediction block.
- reference pixels are generated by interpolation or extrapolation using the reconstructed neighboring pixels. Intra prediction may be performed based on the generated reference pixels. Therefore, even if a picture referenced by neighboring inter-coded blocks is lost, the prediction target block may not be affected.
- the deblocking filtering process since filtering is always performed on the reconstructed image regardless of whether the limited intra prediction is applied or the encoding parameter, the deblocking filtering process may be propagated to an area in which no error occurs in the reconstructed image. For example, an error occurring in an inter coded block may be propagated to an intra coded block. Therefore, the conventional deblocking filtering process has a problem that can significantly reduce the subjective quality of the reconstructed image.
- a method of transmitting a flag indicating whether to apply a limited sample adaptive offset (SAO) compensation or an adaptive loop filter (ALF) may be proposed.
- the pixel adaptive offset compensation or the adaptive loop filter may be limitedly applied according to the encoding parameters of the current block and the neighboring block. . Accordingly, even when the inter coded block cannot be normally restored, the intra coded block can be normally decoded. That is, the error of the inter coded block can be prevented from being propagated to the intra coded block, and the reconstruction result of the intra coded block can be kept the same in the encoder and the decoder.
- Pixel adaptive offset compensation may be included in in-loop filtering, and in-loop filtering may include a deblocking filter in addition to pixel adaptive offset compensation.
- FIG. 3 shows an embodiment of a proposed image encoding method.
- step S100 the encoder transmits the limited offset compensation indicator to the decoder.
- step S110 the encoder transmits a SAO compensation indicator indicating whether to perform sample adaptive offset (SAO) compensation to the decoder.
- step S120 the encoder transmits the SAO parameter to the decoder.
- operation S130 the encoder performs pixel adaptive offset compensation on the reconstructed image based on the SAO compensation indicator and the SAO parameter.
- the decoder uses a limited offset compensation indicator transmitted from the encoder to encode a sequence, a picture, a frame, a field, a slice, a coding unit (CU), and a prediction unit. It may be determined whether at least one or more of a prediction unit (PU) or a transform unit (TU) supports limited offset compensation.
- PU prediction unit
- TU transform unit
- the encoder can insert a limited offset compensation indicator into the bit stream and send it to the decoder.
- the limited offset compensation indicator may be inserted into the bit stream through an entropy coding process such as arithmetic coding or variable length coding (VLC).
- the limited offset compensation indicator may use a sequence parameter set (SPS), a picture parameter set (PPS), an adaptation parameter set (APS), or a slice header in a bit stream. Can be sent.
- the decoder may obtain a limited offset compensation indicator that is transmitted by parsing the bit stream by entropy decoding.
- Table 1 shows an example of the limited offset compensation indicator inserted into the bit stream.
- the offset compensation indicator is inserted into the sequence parameter set.
- seq_parameter_set_rbsp () ⁇ Descriptor ... seq_parameter_set_id ue (v) pic_width_in_luma_samples u (16) pic_height_in_luma_samples u (16) constrained_intra_pred_flag u (1) constrained_offset_flag u (1) ... ⁇
- constrained_offset_flag represents a limited offset compensation indicator. If the value of constrained_offset_flag is 0, it may indicate that limited offset compensation is not supported. If the value of constrained_offset_flag is 1, it may indicate that limited offset compensation is supported. Alternatively, when the value of constrained_intra_pred_flag, which is a parameter for error-proof intra prediction, is 1, it may indicate that limited offset compensation is supported without inserting a separate offset compensation indicator.
- Table 2 shows another example of the limited offset compensation indicator inserted into the bit stream.
- the limited offset compensation indicator is inserted into the picture parameter set.
- pic_parameter_set_rbsp () ⁇ Descriptor ... pic_parameter_set_id ue (v) seq_parameter_set_id ue (v) constrained_offset_flag u (1) ... ⁇
- constrained_offset_flag represents a limited offset compensation indicator. If the value of constrained_offset_flag is 0, it may indicate that limited offset compensation is not supported. If the value of constrained_offset_flag is 1, it may indicate that limited offset compensation is supported.
- Table 3 shows another example of the limited offset compensation indicator inserted into the bit stream.
- the limited offset compensation indicator is inserted into the picture parameter set.
- pic_parameter_set_rbsp () ⁇ Descriptor ... pic_parameter_set_id ue (v) seq_parameter_set_id ue (v) loop_filter_across_tiles_enabled_flag u (1) loop_filter_across_slices_enabled_flag u (1) ... ⁇
- loop_filter_across_tiles_enabled_flag or loop_filter_across_slices_enabled_flag are limited offset compensation indicators. If the value of the loop_filter_across_tiles_enabled_flag is 0, it may indicate that limited offset compensation is supported. Alternatively, if the value of loop_filter_across_slices_enabled_flag is 0, it may indicate that limited offset compensation is supported.
- the encoder and the decoder may always support limited offset compensation without inserting a separate offset compensation indicator.
- the encoder may use an encoding parameter.
- the coding parameter includes a coding mode indicating whether intra coding or inter coding, intra prediction mode, inter prediction mode, and coding block flag ( Coded block flag (CBF), quantization parameter, motion vector, motion vector predictor, reference picture index, slice / tile boundary Whether at least one or more.
- CBF Coded block flag
- the encoding parameter may include a boundary of the tile, and when the value of the limited offset compensation indicator is 0, the offset compensation may be limited so as not to be performed beyond the tile boundary.
- the limited offset compensation indicator may be loop_filter_across_tiles_enabled_flag of Table 3. The boundary of a tile may be determined based on an identifier (ID) of the tile.
- the encoding parameter may include a boundary of the slice, and when the value of the limited offset compensation indicator is 0, the offset compensation may not be performed beyond the slice boundary.
- the limited offset compensation indicator may be loop_filter_across_slices_enabled_flag of Table 3. The boundary of the slice may be determined based on the identifier of the slice.
- the target block or neighboring blocks to which the limited offset compensation is applied are encoded in the picture or the inter-picture code using the encoding parameter.
- the block may be encoded in an intra mode. If a block is encoded in the picture, the block may be encoded in an inter mode.
- PCM pulse coded modulation
- the degree of reliability may be determined according to the encoding parameter, and the determined degree of reliability may be applied when performing the limited offset compensation. For example, as shown in Table 4, the degree of reliability may be determined according to each coding parameter, and the degree of reliability may be determined according to a combination of one or more coding parameters.
- a block encoded into a picture may be determined to have a high reliability since prediction is performed in a current slice, and a block encoded between pictures may be determined to have a low reliability since prediction is performed through a previous slice. have.
- a block within the slice / tile boundary may be determined to have high reliability, and a block outside the boundary may be determined to have low reliability.
- the value of the limited offset compensation indicator loop_filter_across_tiles_enabled_flag or loop_filter_across_slices_enabled_flag in Table 3 is 0, out of bounds of reliability may not be allowed.
- pixel adaptive offset compensation can be performed.
- the encoder can improve the performance by calculating an offset by calculating a pixel value error between the original image and the reconstructed image, and applying it to the reconstructed image to minimize distortion with the original image.
- the SAO compensation indicator transmitted in step S110 may be transmitted by being included in a sequence parameter set, a picture parameter set, an adaptation parameter set, or a slice header.
- the SAO compensation indicator may be sample_adaptive_offset_enabled_flag.
- whether or not to perform pixel adaptive offset compensation on the luminance component and the chrominance component may be signaled by being included in each bit stream.
- the SAO parameter may include at least one of an offset compensation block structure, a quadtree depth, an offset type, an offset category, and an offset value.
- the SAO parameter may include an offset compensation block structure in the bit stream.
- the offset compensation block structure in the SAO parameter may be sao_split_flag.
- one slice may be divided into quadtrees to signal information about an offset compensation block structure.
- information about a depth divided into quadtrees may also be included in the bit stream, and the minimum unit of the divided region may be a large coding unit (LCU).
- LCU large coding unit
- the SAO parameter may include an offset type, an offset type, an offset sign, and an offset value.
- Table 5 shows the offset types and the number of offset types according to the pixel adaptive offset compensation.
- Offset type index Offset type Offset Type Count 0 Do not perform offset 0 One Edge offset 1-Dimensional 0 Degree Format Edge Offset 4 2 One-dimensional 90 degree format edge offset 4 3 One-dimensional 135 degree format edge offset 4 4 One-dimensional 45 degree format edge offset 4 5 band offset Center band offset 16 6 Side band offset 16
- the number of offset types may be a total of seven. However, the offset types in Table 5 are merely examples, and the number of offset types may vary. Each offset type may have a different number and different offset values.
- Edge offsets may be classified into four offset types according to angles. In the edge offset, each offset type may have four offset types according to a condition. The offset type and the offset code in the edge offset may be determined by comparing the offset compensation target pixel and the neighboring pixels. That is, in the case of the edge offset, the offset type and the offset code may be determined by the decoder without additional signaling.
- a band offset (BO) may be classified into two offset types according to the position of the band, and may have 16 offset types.
- the offset type in the band offset may be determined according to which of the divided sections is divided after dividing the range of pixel values that the offset compensation target pixel may have into 16 sections.
- the offset type index may be encoded and signaled to the decoder according to the determined offset type, and the offset type and offset code may be classified according to conditions in the encoder and the decoder without signaling.
- the determined offset type and offset sign may correspond to parsed offset values, respectively.
- the offset type is determined as an edge offset, four offset values may be signaled to the decoder, and when determined as a band offset, 16 offset values may be signaled to the decoder.
- the SAO parameter may be determined based on encoding parameters of at least one block among a target block of pixel adaptive offset compensation or a neighboring block of the target block.
- encoding parameters of at least one or more blocks of a target block and neighboring blocks of pixel adaptive offset compensation may be used.
- the encoding parameter may include a boundary of the tile, and the boundary of the tile may be determined based on the identifier of the tile.
- the encoding parameter may include a boundary of the slice, and the boundary of the slice may be determined based on the identifier of the slice.
- Edge offsets can be classified into four offset types according to the angle.
- C denotes a target pixel of pixel adaptive offset compensation
- N denotes a peripheral pixel.
- FIG. 5 illustrates a case in which an offset type and an offset code are determined in an edge offset type by using encoding parameters in the proposed image encoding method.
- a target block and a left block of pixel adaptive offset compensation are encoded into a screen, and a target block and a higher block are encoded between screens. That is, in FIG. 5, C and N 1 become block pixels within the screen, and N 2 becomes block pixels between the screens.
- Table 6 shows the conditions under which the offset type is determined, and N may be N 1 or N 2 . When the offset type is determined as 1 or 2, the offset sign may be positive, and when the offset type is determined as 3 or 4, the offset sign may be negative.
- Offset type Condition One C is less than two N's 2 C is less than one N and equal to the other N 3 C is greater than one N and equal to the other N 4 C is greater than two N 0 Does not meet the above conditions
- the offset type may be determined using only the pixels encoded into the screen in the target block without using pixels of the block encoded between the screens among the neighboring blocks. This is to prevent an error from propagating to the pixels of the block encoded into the screen.
- an offset type may be determined by replacing pixels of a block encoded between screens with pixels of a block encoded into the screen without using pixels of a block encoded between screens among neighboring blocks. have. For example, the offset type may be determined by replacing the pixel value of N 2 with the pixel value of D in FIG. 5. Alternatively, the offset type may not be determined.
- the encoder may reconstruct the offset compensated pixel value by adding the offset value calculated based on the SAO compensation indicator and the SAO parameter to the pixel value. After decoding each offset value, the decoder may perform pixel adaptive offset compensation by using an offset value corresponding to an offset type classified by a condition for each pixel in each block.
- the pixel adaptive offset compensation may be performed based on encoding parameters of at least one or more blocks of the target block or the neighboring blocks of the target block of the pixel adaptive offset compensation.
- the encoding parameter includes a tile boundary, and pixel adaptive offset compensation may be performed based on the tile boundary. For example, pixel adaptive offset compensation may not be performed beyond the boundary of the tile.
- the encoding parameter may include a boundary of the slice, and pixel adaptive offset compensation may be performed based on the boundary of the slice. Pixel adaptive offset compensation may not be performed beyond the boundaries of the slice.
- the pixels of the block among the neighboring blocks encoded between the screens are Without using the pixel adaptive offset compensation may be performed using only the pixels encoded into the screen in the target block. This is to prevent an error from propagating to the pixels of the block encoded into the screen.
- the pixel adaptive offset compensation may be performed by replacing the pixels of the block encoded between the screens among the neighboring blocks with the pixels of the block encoded into the screen.
- pixel adaptive offset compensation may not be performed.
- the encoder divides a slice into sizes of various blocks of a quadtree structure, and performs an optimal type of rate-distortion optimization (RDO) among edge offsets or band offsets for each block. Can be used and determined, and the offset type and offset value can be determined for the determined optimal type.
- RDO rate-distortion optimization
- SAO parameters may be entropy encoded and transmitted to the decoder.
- the image encoding method based on the limited offset compensation described above may be applied to the image decoding method as it is. That is, the decoder receives and parses the limited offset compensation indicator, the SAO compensation indicator, the SAO parameter, etc. transmitted from the encoder, and performs pixel adaptive offset compensation based on this.
- FIG. 6 shows an embodiment of a proposed image decoding method.
- step S200 the decoder receives the limited offset compensation indicator from the encoder.
- Table 7 shows an example of the limited offset compensation indicator inserted in the picture parameter set.
- pic_parameter_set_rbsp () ⁇ Descriptor pic_parameter_set_id ue (v) seq_parameter_set_id ue (v) ... . constrained_intra_pred_flag u (1) if (constrained_intra_pred_flag) constrained_in_loop_filter_flag u (1) ... .
- the decoder may parse constrained_in_loop_filter_flag to determine whether to apply the restricted in-loop filter. If the value of constrained_in_loop_filter_flag is 1, it may indicate to apply a restricted in-loop filter, and if the value of constrained_in_loop_filter_flag is 0, it may indicate not to apply a restricted in-loop filter.
- the application target of the limited in-loop filter may be at least one of a deblocking filter, an offset compensation, and an ALF.
- the decoder receives a SAO compensation indicator indicating whether to perform the SAO compensation from the encoder.
- the decoder may determine whether to perform SAO compensation by parsing the SAO compensation indicator sample_adaptive_offset_enabled_flag transmitted in a sequence parameter set, a picture parameter set, an adaptation parameter set, or a slice header in the bit stream.
- the decoder may parse information from the bit stream to determine whether to perform SAO compensation on each of the luminance component and the chrominance component.
- the decoder receives the SAO parameters from the encoder.
- the decoder may parse SAO parameters transmitted from the encoder. For example, when the SAO parameter includes sao_split_flag, which is information on the offset compensation block structure, in the bit stream, the decoder may parse it to determine the structure of the block to perform pixel adaptive offset compensation. In addition, the decoder may also parse information about the depth divided into quadtrees included in the bit stream.
- the offset type and the offset type thereof may follow Table 5 described above.
- the number of offset types may be seven in total.
- Each offset type may have a different number and different offset values.
- the decoder may parse four offset values from the bit stream when the offset type is determined to be an edge offset, and may parse 16 offset values from the bit stream when it is determined as a band offset.
- the offset type according to each offset type may correspond to the parsed offset value, respectively.
- the offset type and the offset code in the edge offset may be determined by comparing the offset compensation pixel and the surrounding pixels, and the offset type in the band offset may be a range of pixel values that the offset compensation pixel may have in 16 sections. After dividing, it may be determined according to one of the divided sections.
- the offset type for the target pixel may not be determined. That is, the offset type may be set to 0 so as not to perform offset compensation.
- the value of constrained_in_loop_filter_flag in the offset compensation indicator is 1, and the pixel at (x, y) belongs to the block encoded into the screen and is located at (x + hPos [k], y + vPos [k]).
- the value of the offset type may be set to zero.
- the offset type when the offset type is 2, the value of constrained_in_loop_filter_flag in the offset compensation indicator is 1, and the pixel located at (x, y) belongs to the block encoded into the screen and (x, y + 1). ) Or one or more pixels located at (x, y-1) belong to a block encoded between screens, the offset type may be set to '0'.
- the value of the limited offset compensation indicator is 1 and one pixel located at (x, y) and one or more pixels located at (x + hPos [k], y + vPos [k]) belong to different slices / tiles. That is, when one or more pixels located at (x + hPos [k], y + vPos [k]) are located outside the slice / tile to which the pixel located at (x, y) belongs, the value of the offset type may be set to 0. Can be. In addition, when the slice / tile boundary is the boundary of the picture, the outside of the slice / tile boundary may be outside the picture without pixels.
- the SAO parameter may be determined based on encoding parameters of at least one block among a target block of pixel adaptive offset compensation or a neighboring block of the target block.
- the decoder performs pixel adaptive offset compensation based on the SAO compensation indicator and the SAO parameter.
- the decoder may restore the offset compensated pixel value by adding the offset value calculated based on the SAO compensation indicator and the SAO parameter to the pixel value.
- RecSaoPicture [x, y] represents a pixel value after performing pixel adaptive offset compensation on the pixel located at (x, y), and RecPicture [x, y] is a reconstructed pixel before performing pixel adaptive offset compensation. Indicates a value.
- FIG. 7 shows another embodiment of a proposed video encoding method.
- step S300 the encoder transmits the restricted loop filter indicator to the decoder.
- step S310 the encoder transmits an ALF application indicator indicating whether to apply ALF to the decoder.
- step S320 the encoder transmits the ALF parameter to the decoder.
- step S330 the encoder applies ALF to the reconstructed image based on the ALF application indicator and the ALF parameter.
- the limited loop filter indicator transmitted in step S300 will be described.
- the decoder may determine whether at least one or more of an encoding target sequence, a picture, a frame, a field, a slice, a CU, a PU, or a TU applies a restricted loop filter by a limited loop filter indicator transmitted from an encoder.
- the encoder can insert a restricted loop filter indicator into the bit stream and send it to the decoder.
- the restricted loop filter indicator may be inserted into the bit stream through arithmetic coding or entropy coding such as VLC.
- the limited offset compensation indicator may be transmitted using an SPS, PPS, APS or slice header in the bit stream.
- the decoder can obtain a limited offset compensation indicator which is transmitted by parsing the bit stream by entropy decoding.
- Table 9 shows an example of a restricted loop filter indicator inserted into a bit stream.
- the loop filter indicator is inserted into the sequence parameter set.
- seq_parameter_set_rbsp () ⁇ Descriptor ... seq_parameter_set_id ue (v) pic_width_in_luma_samples u (16) pic_height_in_luma_samples u (16) constrained_intra_pred_flag u (1) constrained_filter_flag u (1) ... ⁇
- the constrained_filter_flag is a restricted loop filter indicator. If the value of constrained_filter_flag is 0, the restricted loop filter is not applied. If the value of constrained_filter_flag is 1, it may indicate that the limited loop filter is supported. Alternatively, if the value of constrained_intra_pred_flag, which is a parameter for error-proof intra prediction, is 1, it may be indicated to apply a restricted loop filter without inserting a separate loop filter indicator.
- Table 10 shows another example of the restricted loop filter indicator inserted into the bit stream.
- the restricted loop filter indicator is inserted into the picture parameter set.
- pic_parameter_set_rbsp () ⁇ Descriptor ... pic_parameter_set_id ue (v) seq_parameter_set_id ue (v) constrained_fitler_flag u (1) ... ⁇
- the constrained_filter_flag is restricted loop filter indicator. If the value of the constrained_filter_flag is 0, the restricted loop filter may not be applied. If the value of the constrained_filter_flag is 1, it may be indicated to apply the restricted loop filter.
- loop_filter_across_tiles_enabled_flag or loop_filter_across_slices_enabled_flag may indicate a limited loop filter indicator. If the value of loop_filter_across_tiles_enabled_flag is 0, it may indicate to apply a restricted loop filter. Alternatively, if the value of loop_filter_across_slices_enabled_flag is 0, it may indicate to apply a restricted loop filter.
- the limited loop filter may be always applied to the encoder and the decoder without inserting a separate loop filter indicator.
- the encoder may use an encoding parameter.
- the encoding parameter may include at least one of an encoding mode indicating an intra picture or an inter picture encoding, an intra picture prediction mode, an inter picture prediction mode, a CBF, a quantization parameter, a motion vector, a motion vector predictor, a reference picture index, and a slice / tile boundary. It includes one or more.
- the encoding parameter may include a tile boundary, and if the value of the limited loop filter indicator is 0, the loop filter may be limited so that the loop filter is not applied beyond the tile boundary.
- the restricted loop filter indicator may be loop_filter_across_tiles_enabled_flag of Table 3. The boundary of a tile may be determined based on an identifier (ID) of the tile.
- the encoding parameter may include a boundary of the slice, and when the value of the limited loop filter indicator is 0, the loop filter may be limited so that the loop filter is not applied beyond the slice boundary.
- the restricted loop filter indicator may be loop_filter_across_slices_enabled_flag of Table 3. The boundary of the slice may be determined based on the identifier of the slice.
- an application target block or neighboring blocks of the restricted loop filter are intra coded or inter coded by using an encoding parameter.
- the block may be referred to as being encoded in the picture mode.
- the block may be referred to as being coded in the picture mode.
- the block may be determined that the block is encoded in the picture.
- the degree of reliability may be determined according to the encoding parameter, and the determined degree of reliability may be applied when performing the limited offset compensation. For example, as shown in Table 4, the degree of reliability may be determined according to each coding parameter, and the degree of reliability may be determined according to a combination of one or more coding parameters. In Table 3, when the value of the limited loop filter indicator loop_filter_across_tiles_enabled_flag or loop_filter_across_slices_enabled_flag is 0, out of bounds of reliability may not be allowed.
- ALF a limited loop filter
- the coder derives filter coefficients based on a Wiener filter that minimizes the error between the original image and the reconstructed image, and then applies them to the reconstructed image to minimize distortion with the original image.
- the ALF application indicator transmitted in step S310 may be included in a sequence parameter set, a picture parameter set, an adaptation parameter set, or a slice header and transmitted.
- the ALF application indicator may be adaptive_loop_filter_flag.
- whether or not ALF is applied to the luminance component and the chrominance component may be included in each bit stream for signaling.
- whether to apply ALF may be determined in a CU unit or an image unit.
- the ALF parameter may include at least one of a filter shape, a filter coefficient, a filter classification method, a filter index, a filter prediction method, and a maximum filter depth.
- the encoder may determine an optimal filter shape among a plurality of filter shapes.
- the encoder may determine the filter coefficient used to apply the ALF.
- the filter coefficient may be one or more, and may be encoded by an exponential Golomb code having a different order.
- prediction coding may be performed between the filter coefficients by a method such as differential pulse code modulation (DPCM), and one filter coefficient may be predictively encoded from the sum of the other filter coefficients.
- DPCM differential pulse code modulation
- the filter may be selected using one of a region-based adaptation (RA) and a block-based adaptation (BA) as a filter classification method.
- RA region-based adaptation
- BA block-based adaptation
- the filter classification method is determined by the RA method
- the value of alf_region_adaptation_flag is set to 1
- the value of alf_region_adaptation_flag is set to 0.
- the RA method any one of a plurality of filters may be selected per divided image region.
- the BA method one of the plurality of filters may be selected in consideration of the amount of change and the direction of the pixels. Can be.
- the filter index in the ALF parameter may be used to indicate which filter is selected.
- the ALF can be applied only up to a CU of a specific depth.
- FIG. 8 shows an example of a filter shape determined by an encoder in the proposed image encoding method.
- the number in each filter represents the filter coefficient index.
- the encoder includes information on the filter shape and the filter classification method in the ALF parameter and transmits the information to the decoder, and the filter is selected according to the determined filter classification method.
- the filtering may be performed based on the sum of the product of each filter coefficient and the pixel value corresponding to each position in filtering the pixel value located at the center of the filter shape.
- the encoding parameter may include a boundary of the tile, and the boundary of the tile may be determined based on the identifier of the tile.
- the encoding parameter may include a boundary of the slice, and the boundary of the slice may be determined based on the identifier of the slice.
- FIG. 9 illustrates a case of classifying a filter based on a BA method by using an encoding parameter in the proposed image encoding method.
- a target block of ALF application is encoded into a screen and neighboring blocks are encoded between screens
- a horizontal or vertical directionality is determined in 4 ⁇ 4 block units
- the pixels in the screen may be pixels of a block in the screen, and the shaded pixels may be pixels of an inter screen block.
- "R" represents a restored pixel
- VA is vertical
- HA is horizontal.
- the filter may be classified using only the pixels encoded into the screen in the target block without using pixels of the blocks encoded between the screens among the neighboring blocks. This is to prevent an error from propagating to the pixels of the block encoded into the screen.
- the filter may be classified by replacing the pixels of the block encoded between the screens among the neighboring blocks with the pixels of the block encoded into the screen. For example, in the case of determining the horizontal or vertical directionality at the position 'R (0,0) ' in FIG. 9, 'R (-1,0) ' or 'R (0,- ) included in the inter-screen block. 1) The direction can be determined after replacing the 'value with the value of the block in the screen. Alternatively, the filter may not be classified.
- FIG. 10 illustrates an example of applying ALF using an encoding parameter in the proposed image encoding method.
- the ALF may be determined based on encoding parameters of at least one or more blocks of a target block of the ALF application or a neighboring block of the target block.
- the encoding parameter may include a boundary of the tile, and the ALF may be applied based on the boundary of the tile. For example, ALF may not be applied beyond the boundary of the tile.
- the encoding parameter may include a boundary of the slice, and the ALF may be applied based on the boundary of the slice. ALF may not be applied beyond the boundaries of the slice.
- the pixels of the block encoded between the screens among the neighboring blocks are not used.
- the ALF may be applied using only pixels encoded in the screen among the target block or the neighboring block. This is to prevent an error from propagating to the pixels of the block encoded into the screen.
- the filter is applied only when the filter coefficient is included in the block encoded into the screen as shown in FIG. 10- (b). That is, the filter can be applied only to the pixel values i, j, k, l, m, n, o, and p.
- the ALF may be applied by replacing the pixels of the block encoded between the screens among the neighboring blocks with the pixels of the block encoded into the screen. Alternatively, ALF may not be applied.
- the encoder may apply ALF based on the ALF application indicator and the ALF parameter.
- the ALF may be applied based on encoding parameters of at least one or more blocks of a target block of the ALF application or neighboring blocks of the target block.
- the encoder synchronizes one slice to a coding tree block structure, and whether a filter is performed in units of CUs, a maximum depth of a filter, a filter prediction method, a filter classification method, a filter shape, and a filter coefficient. Etc. using RDO and determining, and applying the ALF using the determined optimal ALF parameters.
- Such ALF parameter may be entropy encoded and transmitted to the decoder.
- the image encoding method based on the limited loop filter described so far may be applied to the image decoding method as it is. That is, the decoder receives and parses the restricted loop filter indicator, the ALF application indicator, the ALF parameter, etc. transmitted from the encoder, and applies the ALF based on this.
- FIG. 11 shows an embodiment of a proposed image decoding method.
- step S400 the decoder receives the restricted loop filter indicator from the encoder.
- Table 11 shows an example of a restricted loop filter indicator inserted in the picture parameter set.
- pic_parameter_set_rbsp () ⁇ Descriptor pic_parameter_set_id ue (v) seq_parameter_set_id ue (v) ... . constrained_intra_pred_flag u (1) if (constrained_intra_pred_flag) constrained_in_loop_filter_flag u (1) ... .
- the decoder may parse constrained_in_loop_filter_flag to determine whether to apply the restricted in-loop filter. If the value of constrained_in_loop_filter_flag is 1, it may indicate to apply a restricted in-loop filter, and if the value of constrained_in_loop_filter_flag is 0, it may indicate not to apply a restricted in-loop filter.
- the application target of the limited in-loop filter may be at least one of a deblocking filter, an offset compensation, and an ALF.
- the decoder receives an ALF application indicator indicating whether to apply ALF from the encoder.
- the decoder may determine whether to apply ALF by parsing an ALF application indicator adaptive_loop_filter_enabled_flag transmitted in a sequence parameter set, a picture parameter set, an adaptive parameter set, or a slice header in a bit stream.
- the decoder may parse information, for example, whether to apply ALF to each of a luminance component and a chrominance component, or information about whether to apply ALF in a CU unit from a bit stream.
- step S420 the decoder receives an ALF parameter from the encoder.
- the decoder may parse the ALF parameter transmitted from the encoder.
- the ALF parameter may include at least one of a filter shape, a filter coefficient, a filter classification method, a filter index, a filter prediction method, and a maximum filter depth.
- the decoder may parse the bit stream to determine the filter shape and / or filter coefficients.
- the number of filter coefficients may be one or more, and may be decoded by an exponential Golomb code of another order.
- the filter coefficients may be predictively decoded by a method such as DPCM, and one filter coefficient may be predictively decoded from the sum of the other filter coefficients.
- the filter may be differently selected using one of the RA method and the BA as the filter classification means. For example, by parsing the alf_region_adaptation_flag transmitted by the encoder, the filter may be classified by the RA method if '1', and the BA method if the filter is '0'.
- the RA method any one of a plurality of filters may be selected per divided image region.
- the BA method one of the plurality of filters may be selected in consideration of the amount of change and the direction of the pixels. Can be.
- the filter index in the ALF parameter may be used to indicate which filter is selected.
- the decoder may determine and apply the directionality only at the R (2,2) position in which all of the ALF-applied pixels and neighboring pixels are included in the screen.
- the filter can be determined.
- the ALF parameter may be determined based on encoding parameters of at least one or more blocks of a target block of ALF application or neighboring blocks of the target block.
- the decoder applies ALF based on the ALF application indicator and the ALF parameter.
- the decoder may apply ALF based on the ALF application indicator and the ALF parameter.
- the ALF may be applied based on encoding parameters of at least one or more blocks of a target block of the ALF application or neighboring blocks of the target block.
- the ALF may not be applied to the application target pixel of the ALF.
- FIG. 12 shows an example of a filter shape used in the proposed image decoding method.
- the ALF may not be applied to the target pixel. .
- the invention can be implemented in hardware, software or a combination thereof.
- an application specific integrated circuit ASIC
- DSP digital signal processing
- PLD programmable logic device
- FPGA field programmable gate array
- the module may be implemented as a module that performs the above-described function.
- the software may be stored in a memory unit and executed by a processor.
- the memory unit or processor may employ various means well known to those skilled in the art.
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Abstract
Description
seq_parameter_set_rbsp() { | Descriptor |
... | |
seq_parameter_set_id | ue(v) |
pic_width_in_luma_samples | u(16) |
pic_height_in_luma_samples | u(16) |
constrained_intra_pred_flag | u(1) |
constrained_offset_flag | u(1) |
... | |
} |
pic_parameter_set_rbsp() { | Descriptor |
... | |
pic_parameter_set_id | ue(v) |
seq_parameter_set_id | ue(v) |
constrained_offset_flag | u(1) |
... | |
} |
pic_parameter_set_rbsp() { | Descriptor |
... | |
pic_parameter_set_id | ue(v) |
seq_parameter_set_id | ue(v) |
loop_filter_across_tiles_enabled_flag | u(1) |
loop_filter_across_slices_enabled_flag | u(1) |
... | |
} |
부호화 파라미터 | 신뢰성 강함 | 신뢰성 약함 |
부호화 모드 | 화면 내 | 화면 간 |
부호화 블록 플래그 | CBF≠0 | CBF=0 |
양자화 매개변수 | QP<특정 QP | QP>특정 QP |
화면간 모드 | 스킵(skip) 모드가 아님 | 스킵 모드임 |
슬라이스/타일 경계 | 경계 내 | 경계 밖 |
오프셋 타입 인덱스 | 오프셋 타입 | 오프셋 종류 개수 | |
0 | 오프셋 수행 안 함 | 0 | |
1 | 에지 오프셋 |
1차원 0도 형식 에지 오프셋 | 4 |
2 | 1차원 90도 형식 에지 오프셋 | 4 | |
3 | 1차원 135도 형식 에지 오프셋 | 4 | |
4 | 1차원 45도 형식 에지 오프셋 | 4 | |
5 | 밴드 오프셋 |
중앙 밴드 오프셋 | 16 |
6 | 측면 밴드 오프셋 | 16 |
오프셋 종류 | 조건 |
1 | C가 2개의 N보다 작다 |
2 | C가 하나의 N보다 작고, 다른 하나의 N과 같다 |
3 | C가 하나의 N보다 크고, 다른 하나의 N과 같다 |
4 | C가 2개의 N보다 크다 |
0 | 위의 조건에 해당되지 않는다 |
pic_parameter_set_rbsp() { | Descriptor |
pic_parameter_set_id | ue(v) |
seq_parameter_set_id | ue(v) |
…. | |
constrained_intra_pred_flag | u(1) |
if (constrained_intra_pred_flag ) | |
constrained_in_loop_filter_flag | u(1) |
…. |
타입1 | 타입2 | 타입3 | 타입4 | |
hPos[0] | -1 | 0 | -1 | 1 |
hPos[1] | 1 | 0 | 1 | -1 |
vPos[0] | 0 | -1 | -1 | -1 |
vPos[1] | 0 | 1 | 1 | 1 |
seq_parameter_set_rbsp() { | Descriptor |
... | |
seq_parameter_set_id | ue(v) |
pic_width_in_luma_samples | u(16) |
pic_height_in_luma_samples | u(16) |
constrained_intra_pred_flag | u(1) |
constrained_filter_flag | u(1) |
... | |
} |
pic_parameter_set_rbsp() { | Descriptor |
... | |
pic_parameter_set_id | ue(v) |
seq_parameter_set_id | ue(v) |
constrained_fitler_flag | u(1) |
... | |
} |
pic_parameter_set_rbsp() { | Descriptor |
pic_parameter_set_id | ue(v) |
seq_parameter_set_id | ue(v) |
…. | |
constrained_intra_pred_flag | u(1) |
if (constrained_intra_pred_flag ) | |
constrained_in_loop_filter_flag | u(1) |
…. |
Claims (18)
- 시퀀스(sequence), 픽쳐(picture), 프레임(frame), 슬라이스(slice), 부호화 유닛(CU; coding unit), 예측 유닛(PU; prediction unit) 및 변환 유닛(TU; transform unit) 중 적어도 하나 이상이 제한된 오프셋 보상을 지원하는지 여부를 지시하는 제한된 오프셋 보상 지시자를 부호화기로부터 수신하는 단계;
화소 적응적 오프셋(SAO; sample adaptive offset) 보상의 수행 여부를 지시하는 SAO 보상 지시자를 상기 부호화기로부터 수신하는 단계;
SAO 파라미터를 상기 부호화기로부터 수신하는 단계; 및
상기 SAO 보상 지시자 및 상기 SAO 파라미터를 기반으로 복원된 영상의 화소에 화소 적응적 오프셋 보상을 수행하는 단계를 포함하는 영상 복호화 방법. - 제 1 항에 있어서,
상기 제한된 오프셋 보상 지시자는 비트 스트림(bit stream) 내의 시퀀스 파라미터 세트(SPS; sequence parameter set), 픽쳐 파라미터 세트(PPS; picture parameter set), 적응 파라미터 세트(APS; adaptation parameter set) 또는 슬라이스 헤더(slice header) 중 어느 하나에 포함되어 수신되는 것을 특징으로 하는 영상 복호화 방법. - 제 1 항에 있어서,
상기 SAO 보상 지시자는 비트 스트림 내의 SPS, PPS, APS 또는 슬라이스 헤더 중 어느 하나에 포함되어 수신되는 것을 특징으로 하는 영상 복호화 방법. - 제 1 항에 있어서,
상기 SAO 파라미터는 화소 적응적 오프셋 보상의 대상 블록과 상기 대상 블록의 주변 블록 중 적어도 하나 이상의 블록의 부호화 파라미터를 기반으로 결정되는 것을 특징으로 하는 영상 복호화 방법. - 제 4 항에 있어서,
상기 부호화 파라미터는 화면 내 또는 화면 간 부호화 파라미터인 것을 특징으로 하는 영상 복호화 방법. - 제 4 항에 있어서,
상기 부호화 파라미터는 슬라이스(slice) 또는 타일(tile)의 경계 또는 식별자(ID; identifier)인 것을 특징으로 하는 영상 복호화 방법. - 제 1 항에 있어서,
상기 화소 적응적 오프셋 보상은 화소 적응적 오프셋 보상의 대상 블록과 상기 대상 블록의 주변 블록 중 적어도 하나 이상의 블록의 부호화 파라미터를 기반으로 수행되는 것을 특징으로 하는 영상 복호화 방법. - 제 7 항에 있어서,
상기 부호화 파라미터는 화면 내 또는 화면 간 부호화 파라미터인 것을 특징으로 하는 영상 복호화 방법. - 제 7 항에 있어서,
상기 부호화 파라미터는 슬라이스 또는 타일의 경계 또는 식별자인 것을 특징으로 하는 영상 복호화 방법. - 시퀀스(sequence), 픽쳐(picture), 프레임(frame), 슬라이스(slice), 부호화 유닛(CU; coding unit), 예측 유닛(PU; prediction unit) 및 변환 유닛(TU; transform unit) 중 적어도 하나 이상이 제한된 오프셋 보상을 지원하는지 여부를 지시하는 제한된 오프셋 보상 지시자를 복호화기로 전송하는 단계;
화소 적응적 오프셋(SAO; sample adaptive offset) 보상의 수행 여부를 지시하는 SAO 보상 지시자를 상기 복호화기로 전송하는 단계;
SAO 파라미터를 상기 복호화기로 전송하는 단계; 및
상기 SAO 보상 지시자 및 상기 SAO 파라미터를 기반으로 복원된 영상의 화소에 화소 적응적 오프셋 보상을 수행하는 단계를 포함하는 영상 부호화 방법. - 시퀀스(sequence), 픽쳐(picture), 프레임(frame), 슬라이스(slice), 부호화 유닛(CU; coding unit), 예측 유닛(PU; prediction unit) 및 변환 유닛(TU; transform unit) 중 적어도 하나 이상이 제한된 루프 필터의 적용을 지원하는지 여부를 지시하는 제한된 루프 필터 지시자를 부호화기로부터 수신하는 단계;
적응적 루프 필터(ALF; adaptive loop filteret) 적용 여부를 지시하는 ALF 보상 지시자를 상기 부호화기로부터 수신하는 단계;
ALF 파라미터를 상기 부호화기로부터 수신하는 단계; 및
상기 ALF 보상 지시자 및 상기 ALF 파라미터를 기반으로 복원된 영상의 화소에 ALF를 적용하는 단계를 포함하는 영상 복호화 방법. - 제 11 항에 있어서,
상기 제한된 루프 필터 지시자는 비트 스트림(bit stream) 내의 시퀀스 파라미터 세트(SPS; sequence parameter set), 픽쳐 파라미터 세트(PPS; picture parameter set), 적응 파라미터 세트(APS; adaptation parameter set) 또는 슬라이스 헤더(slice header) 중 어느 하나에 포함되어 수신되는 것을 특징으로 하는 영상 복호화 방법. - 제 11 항에 있어서,
상기 ALF 적용 지시자는 비트 스트림 내의 SPS, PPS, APS 또는 슬라이스 헤더 중 어느 하나에 포함되어 수신되는 것을 특징으로 하는 영상 복호화 방법. - 제 11 항에 있어서,
상기 ALF 파라미터는 필터 모양(shape), 필터 계수(coefficient), 필터 분류(classification) 방법, 필터 인덱스, 필터 예측 방법 및 필터 수행 최대 깊이 중 적어도 하나 이상을 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 14 항에 있어서,
상기 필터 분류 방법은 영역 기반 적응(RA; region-based adaptation) 방법과 블록 기반 적응(BA; block-based adaptation) 방법을 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 11 항에 있어서,
상기 ALF 파라미터는 ALF 적용의 대상 블록과 상기 대상 블록의 주변 블록 중 적어도 하나 이상의 블록의 부호화 파라미터를 기반으로 결정되는 것을 특징으로 하는 영상 복호화 방법. - 제 11 항에 있어서,
상기 ALF 적용은 ALF 적용의 대상 블록과 상기 대상 블록의 주변 블록 중 적어도 하나 이상의 블록의 부호화 파라미터를 기반으로 적용되는 것을 특징으로 하는 영상 복호화 방법. - 시퀀스(sequence), 픽쳐(picture), 프레임(frame), 슬라이스(slice), 부호화 유닛(CU; coding unit), 예측 유닛(PU; prediction unit) 및 변환 유닛(TU; transform unit) 중 적어도 하나 이상이 제한된 루프 필터의 적용을 지원하는지 여부를 지시하는 제한된 루프 필터 지시자를 복호화기로 전송하는 단계;
적응적 루프 필터(ALF; adaptive loop filter)의 적용 여부를 지시하는 ALF 적용 지시자를 상기 복호화기로 전송하는 단계;
ALF 파라미터를 상기 복호화기로 전송하는 단계; 및
상기 ALF 적용 지시자 및 상기 ALF 파라미터를 기반으로 복원된 영상의 화소에 ALF를 적용하는 단계를 포함하는 영상 부호화 방법.
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