WO2011129573A2 - 인터 예측 방법 및 그 인터 예측 방법을 이용한 동영상 부호화/복호화 방법 - Google Patents
인터 예측 방법 및 그 인터 예측 방법을 이용한 동영상 부호화/복호화 방법 Download PDFInfo
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
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- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
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- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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- 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
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- 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
- H04N19/172—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 picture, frame or field
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- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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Definitions
- An embodiment of the present invention relates to a video encoding and decoding technique, and more particularly, to an inter prediction method and an inter prediction method for solving a disadvantage that coding efficiency may be deteriorated when an IDR picture is used for random access.
- the present invention relates to a video encoding / decoding technique.
- H.264 / AVC uses Instantaneous Decoding Refresh (IDR) pictures to enable arbitrary decoding of encoded bitstreams from specific time locations.
- IDR Instantaneous Decoding Refresh
- the encoder deletes all the decoded images present in the decoded picture buffer (DPB) at the point in time immediately before encoding the IDR picture, and then emptyes the buffer.
- the decoder also emptyes the DPB in the same manner as the encoder just before decoding the IDR picture.
- the encoding method of an IDR picture is the same as the encoding method of an I picture, but supports a random access function that can decode from an arbitrary IDR picture viewpoint by inserting an IDR picture.
- H.264 / AVC predicts a current picture by using a previously decoded image after encoding an inter picture. As illustrated in FIG. 2, the P picture performs motion prediction using an image existing in the past rather than the current picture based on the display order. The difference signal between the block determined by the motion prediction and the current block is encoded.
- the B picture performs motion prediction using not only the image existing in the past but also the image existing in the future based on the display order. Thereafter, the difference signal between the block determined by the motion prediction and the current block is encoded.
- more than one reference picture may be used for each prediction direction for inter prediction. This feature plays a major role in H.264 / AVC's superior compression performance compared to other video compression standards.
- H.264 / AVC uses IDR pictures to support random access.
- the DPB is emptied as shown in FIG. 4 immediately before encoding and decoding the IDR picture. For this reason, some B pictures among the B pictures displayed before the IDR cannot be bi-predicted at the time of encoding, thereby performing motion prediction only in one direction. Thus, a problem arises in that coding efficiency of pictures that perform only unidirectional prediction is reduced.
- the specific P pictures displayed after the IDR picture can use only one IDR picture as a reference picture, and a plurality of pictures before the IDR picture cannot be used as the reference picture. Accordingly, the coding efficiency of the P picture can be reduced.
- the present disclosure is directed to solving the above-described conventional problems, and an object thereof is to solve a problem of a conventional IDR picture used for support of random access and to improve encoding and decoding efficiency, and inter prediction method thereof. It is to provide a video encoding / decoding method using the method.
- a video encoding method using inter prediction includes: encoding a first picture that is a reference for random access; Inter prediction encoding a block included in a second picture displayed before the first picture using a plurality of reference pictures; Generating reference picture information indicating whether a past picture displayed before the second picture is used as a reference picture for encoding the second picture; And transmitting the encoded first and second pictures and the reference picture information (to a decoder).
- the reference picture information may be information indicating the past reference picture, and when the past reference picture is used for encoding the second picture (the encoder) is at least the After the second picture is encoded, reference pictures encoded and decoded before encoding of the first picture and stored in the memory may be deleted.
- the stored past pictures are stored in the future of the current second picture.
- the reference pictures can be copied to the memory for storing and used as future reference pictures.
- future pictures are stored in the memory storing the reference pictures rather than the current second picture, the stored future reference pictures are copied to the memory storing the past reference pictures of the current second picture, and then the past reference pictures of the current second picture.
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a B picture or a P picture.
- IDR picture and R picture shown in the present invention may be called other names only for convenience.
- a video encoding method using inter prediction includes: encoding a first picture, which is a reference for random access; And inter prediction encoding a block included in a second picture displayed before the first picture by using a plurality of reference pictures, and performing the inter prediction encoding on the block included in the second picture.
- One or more pictures obtained by modifying the decoded first picture obtained by decoding the encoded first picture may be used as a reference picture.
- the video encoding method using inter prediction may further include generating deformation identification information indicating a type of deformation of the decoded first picture; And transmitting the encoded first and second pictures and the transform identification information (to a decoder).
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a B picture.
- a video decoding method using inter prediction including: decoding a first picture which is a reference for random access; And decoding the blocks included in the second picture displayed before the first picture by using inter prediction using a plurality of reference pictures, and decoding the blocks included in the second picture. May be performed based on reference picture information indicating whether a past picture displayed before the second picture is used as a reference picture for encoding the second picture.
- the reference picture information may be information indicating the past reference picture, and when the past reference picture is used for decoding the second picture (decoder) at least the After the second picture is decoded, reference pictures decoded and stored in a memory before decoding of the first picture may be deleted.
- the stored past pictures are stored in the future of the current second picture.
- the reference pictures can be copied to the memory for storing and used as future reference pictures.
- the current second picture is decoded, not only the pictures of the past reference picture memory but also the pictures of the future reference picture memory are decoded.
- future pictures are stored in the memory storing the reference pictures rather than the current second picture, the stored future reference pictures are copied to the memory storing the past reference pictures of the current second picture, and then the past reference pictures of the current second picture.
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a P picture or a B picture.
- a video decoding method using inter prediction including: decoding a first picture which is a reference for random access; And decoding a block included in a second picture that is displayed before the first picture using a plurality of reference pictures and using inter prediction, and decoding the block included in the second picture.
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a B picture.
- an inter prediction method includes: encoding or decoding a first picture, which is a reference for random access, in an inter prediction method during video encoding or decoding; And after encoding or decoding the first picture, inter-prediction encoding or decoding the block included in the second picture displayed before the first picture using a plurality of reference pictures.
- a picture obtained by deforming the decoded or decoded first picture after the encoding may be used as a reference picture.
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a B picture.
- an inter prediction method includes: encoding or decoding a first picture, which is a reference for random access, in an inter prediction method during video encoding or decoding; After encoding or decoding the first picture, inter prediction encoding or decoding a block included in a second picture displayed before the first picture using a plurality of reference pictures; And when the past reference picture is used to encode or decode the second picture, after encoding or decoding of the second picture is completed, it is encoded and decoded before encoding of the first picture and stored in a memory or the first picture. And deleting the reference pictures decoded and stored in the memory before decoding the picture.
- the stored past pictures may be stored in the current second picture. Copies future reference pictures to memory that can be used as future reference pictures. Also, when future pictures are stored in the memory storing the reference pictures rather than the current second picture, the stored future reference pictures may be copied into a memory storing past reference pictures of the current second picture and used as the past reference picture.
- the first picture may be an R picture corresponding to an IDR picture
- the second picture may be a P picture or a B picture.
- an inter prediction method includes: encoding or decoding a first picture used as a reference image in an inter prediction method during video encoding or decoding; After encoding or decoding the first picture, inter prediction encoding or decoding a block included in a second picture that is encoded or decoded after the first picture using a plurality of reference pictures; If a past and future reference picture is used for encoding a second picture, and if a past or future reference picture does not exist, copying or modifying the first picture may be used as a past or future reference picture that does not exist. have.
- the first picture may be a picture used as a reference picture of the inter picture
- the second picture may be a B or P picture.
- the IDR picture and the IDR picture are not referred to without reference to reconstructed pictures before the IDR picture. Since encoding is performed using only the reconstructed pictures afterwards, a case of using a smaller number of reference pictures than the P or B pictures encoded before the IDR picture may be solved, thereby reducing the coding efficiency.
- the step and method for generating a new reference picture may be achieved by introducing a new syntax element or allowing the encoder and the decoder to operate in the same manner according to a predetermined algorithm.
- the reconstructed image generated by the encoder and the decoded image generated by the decoder are guaranteed to be the same.
- 1 is a view for explaining a conventional DPB management method when using a past picture as a reference picture than the current picture
- FIG. 2 is a diagram illustrating a prediction method of a P picture
- FIG. 3 is a diagram illustrating a prediction method of a B picture
- FIG. 4 is a diagram illustrating a problem of B picture encoding when using an existing IDR picture
- FIG. 5 is a diagram illustrating a problem of P picture encoding when using an existing IDR picture
- FIG. 6 is a diagram illustrating an example of an H.264 encoder and a decoder
- FIG. 7 is a diagram for explaining a method of predicting a MI block according to an embodiment of the present invention.
- FIG. 8 is a view for explaining an R picture function and defining each picture term according to an embodiment of the present invention.
- FIG. 9 is a flowchart of a video encoding method using inter prediction according to a first embodiment of the present invention.
- FIG. 10 is a flowchart of a video encoding method using inter prediction according to a second embodiment of the present invention.
- FIG. 11 is a flowchart of a video decoding method using inter prediction according to a third embodiment of the present invention.
- FIG. 12 is a flowchart of a video decoding method using inter prediction according to a fourth embodiment of the present invention.
- FIG. 13 is a flowchart of an inter prediction method according to a fifth embodiment of the present invention.
- 16 is a flowchart of a video encoding method using inter prediction according to an eighth embodiment of the present invention.
- FIG. 17 is a flowchart of a video encoding method using inter prediction according to a ninth embodiment of the present invention.
- FIG. 19 is a flowchart of a video decoding method using inter prediction according to an eleventh embodiment of the present invention.
- 21 is a flowchart of an inter prediction method according to a thirteenth embodiment of the present invention.
- FIG. 23 is a diagram illustrating a second example of syntax combination according to an embodiment of the present invention.
- 24 is a diagram illustrating a third example of syntax combination according to an embodiment of the present invention.
- 25 illustrates a fourth example of syntax combination according to an embodiment of the present invention.
- FIG. 26 illustrates a sixth example of syntax combination according to an embodiment of the present invention
- FIG. 27 illustrates a sixth example of syntax combination according to an embodiment of the present invention.
- FIG. 6 is a diagram illustrating an example of an H.264 encoder and a decoder.
- an image may be encoded into one of I, P, and B frames (or called a picture) when the image is encoded.
- An I frame is encoded using only spatial correlation within a frame currently encoded, and can be reconstructed (decoded) using only one frame data without reference to another frame in the decoder.
- the P frame is encoded using inter prediction referring to a reconstructed frame among frames existing in the past based on the display order, and the decoder can reconstruct the current image using the previous reconstructed image. .
- the B frame is encoded through inter prediction using a forward reconstructed picture (list0 in H.264) and a reverse reconstructed picture (list1 in H.264), and a decoder decodes the current picture using forward and reverse reconstructed pictures. It can be restored.
- the image encoder performs intra prediction 300 or inter prediction 302, obtains a difference 304 between the current frame and the prediction image 303, and obtains intra or inter mode information.
- the bitstream 312 is generated by entropy encoding 310 the quantized transform coefficient value 308 obtained after transform / quantization of the difference value 306.
- the encoded image undergoes an inverse quantization / inverse transformation process 314 and is added to the prediction image 303 to form a reconstructed image 316 to be used as a reference frame of images to be encoded into the next P or B picture. (DPB: Decoded Picture Buffer, 318).
- the video decoder 400 is a part of an encoder, receives a bitstream, generates a reconstructed image 316 through the same process as a decoding loop of the encoder, and outputs the restored image 316 to a display terminal.
- the reconstructed image 316 is stored in the DPB 318 to be used as a reference frame of the image to be reconstructed next.
- an IDR frame (an R frame corresponding to an IDR frame in an embodiment of the present invention) is inserted at a predetermined interval when the encoder generates a bitstream. Done.
- the IDR frame is represented in the bitstream as nal_unit_type 5 of a NAL (Network Adaptation Layer) unit.
- NAL Network Adaptation Layer
- the encoder If the encoder resets the DPB buffer in this way, from the decoder side, it looks at the nal_unit_type of the NAL unit on the bitstream. If it is an IDR frame, it can start decoding from the IDR frame portion of the bitstream and restore the images. have. If the decoder starts decoding from the IDR frame in the middle, the DPB of the decoder starts without any reconstructed video. Therefore, it is determined to reset the DPB when the IDR frame is generated in consideration of the state of the decoder. will be.
- a new encoded picture type corresponding thereto is defined as an R (Refresh) picture, and accordingly, a detailed technology is proposed to solve the problem existing in the existing H.264 / AVC.
- the R picture is only a term and a symbol for describing the content of the present invention, and the name does not limit the technical content of the present invention.
- the R picture is a picture type for supporting random access and is a reference picture for random access. That is, the encoder or the decoder may encode or decode from an arbitrary R picture. For this purpose, like the existing I or IDR picture, blocks constituting the R picture are usually encoded and decoded using only intra prediction without using inter prediction referring to another picture. Alternatively, a MI (Moving Intra) block may be used as shown in FIG. 7 to increase coding efficiency.
- MI Microving Intra
- the MI block searches for a block similar to the current block in one picture or slice, expresses and transmits position information by using a motion vector, and differentially transmits pixels of each block by using Equation 1.
- Equation 1 C MI and R MI denote pixel values of a current block and a reference block, and r MI denotes a differential value obtained by subtracting pixel values of two blocks. This differential signal is transmitted after conversion and quantization.
- 7 is just one embodiment for encoding an R picture, and a method of encoding an I picture in the existing H.264 / AVC may be used, and the present invention does not limit the method of encoding the R picture.
- the R picture proposed in the embodiment of the present invention efficiently manages a reference picture list, improves coding efficiency of pictures around the R picture in display order, and supports a random access function.
- terms of pictures that affect coding efficiency by using the R picture as shown in FIG. 8 are summarized.
- B pictures existing between the current R picture and the nearest P, I, or R picture closest to the display order are defined as B P , and are present in the future than the R picture based on the display order, and are decoded.
- B or P pictures that use the current R picture as a reference picture are defined as B F and P F , respectively.
- FIG. 9 is a flowchart of a video encoding method using inter prediction, according to a first embodiment of the present invention.
- an R picture as a first picture as a reference for random access is encoded (S910), and a B picture as a second picture that is displayed before the R picture (eg, the B P picture in FIG. 8).
- the included block is inter prediction encoded using a plurality of reference pictures (S930).
- reference picture information (e.g., Table 1) indicating whether a past picture (e.g., a reference picture of the decoded R picture transformation of FIG. 15) displayed before the B picture is used as a reference picture for encoding the B picture. Syntax) is generated (S950).
- the reference picture information may be information indicating the past reference picture.
- the encoder may delete reference pictures that are encoded and decoded before encoding of the R picture and stored in the memory means after at least the B picture is encoded.
- the encoded R picture, the encoded B picture, and the reference image information are transmitted to the decoder (S970).
- FIG. 10 is a flowchart of a video encoding method using inter prediction, according to a second embodiment of the present invention.
- a plurality of pictures obtained by encoding an R picture as a first picture as a reference for random access (S1010) and deforming the decoded R picture obtained by decoding the encoded R picture are generated as reference pictures. (S1030).
- the block included in the B picture (eg, the B P picture in FIG. 8) as the second picture displayed before the R picture is inter prediction encoded using the plurality of reference pictures (S1050).
- step S1030 deformation identification information indicating a type of deformation of the decoded R picture is generated, and after performing step S1050, the coded R picture, coded B picture, and the deformation identification information are transmitted to a decoder.
- information about the reference picture generated in S1030 may be generated and transmitted to the decoder to correspond to the processes of steps S950 and S970 of FIG. 9.
- FIG. 11 is a flowchart of a video decoding method using inter prediction according to a third embodiment of the present invention.
- an R picture as a first picture as a reference for random access is decoded (S1110), and reference picture information received from an encoder is analyzed (S1130).
- a block included in a B picture (eg, a B P picture of FIG. 8) as a second picture displayed before the R picture is decoded using inter prediction using a plurality of reference pictures, and included in the B picture.
- the decoding of the decoded block is performed based on reference picture information indicating whether a past picture displayed before the B picture is used as a reference picture for encoding the B picture (SS1150).
- FIG. 12 is a flowchart of a video decoding method using inter prediction, according to a fourth embodiment of the present invention.
- an R picture as a first picture as a reference for random access is decoded (S1210), and deformation identification information indicating a type of deformation of the decoded R picture is analyzed (S1230).
- the decoded R picture is transformed into a plurality of reference pictures according to the analyzed transform identification information (S1250), and a B picture as a second picture displayed before the R picture (eg, B P of FIG. 8).
- the block included in the picture) is decoded using inter prediction using the generated plurality of reference pictures (S1270).
- FIG. 13 is a flowchart of an inter prediction method according to a fifth embodiment of the present invention.
- an R picture as a first picture as a reference for random access is encoded or decoded (S1310), and the decoded (decoded after being encoded by an encoder or decoded by a decoder) step by step.
- the image is transformed into a plurality of reference images.
- step S1330 the encoder performs the same process as that of step S1030 of FIG. 10, and the decoder performs the same process as that of steps S1230 to S1250 of FIG.
- a block included in a B picture (eg, a B P picture in FIG. 8) displayed as a second picture displayed before the R picture is generated using the generated plurality of reference pictures.
- Inter-prediction encoding or decoding is performed (S1350).
- FIG. 14 is a flowchart of an inter prediction method according to a sixth embodiment of the present invention.
- the B picture as a second picture displayed before the R picture is displayed.
- the block included in the B P picture of FIG. 8 is inter prediction encoded or decoded using a plurality of reference pictures (S1430).
- 15 is a flowchart of an inter prediction method according to a seventh embodiment of the present invention.
- an R picture as a first picture as a reference for random access is encoded or decoded (S1510), and the decoded (coded after being encoded by an encoder or decoded by a decoder) step by step.
- the image is transformed into a plurality of reference images.
- step S1530 the encoder performs the same process as step S1030 of FIG. 10, and the decoder performs the same process as the steps S1230 to S1250 of FIG.
- a block included in a P picture (eg, a P F picture of FIG. 8) as a second picture displayed after the R picture is at least one of the generated reference pictures.
- Inter prediction encoding or decoding is performed using S1550.
- FIG. 16 is a flowchart of a video encoding method using inter prediction, according to an eighth embodiment of the present invention.
- a memory for future reference pictures displayed later than the current picture after selectively selecting the past reference pictures from the memory (list 0 DPB, L0) in which the past reference pictures displayed before the current picture are stored. (list 1 DPB, L1) is copied (S1610). Thereafter, the current picture is predictively encoded using the reference pictures in L0 and L1 (S1620). At this time, the current picture is a B picture.
- reference picture information (for example, the syntax of Table 1) used as the reference picture for encoding the current picture is generated (S1630).
- a past reference picture may be used for encoding the current picture, a future reference picture may be used, or a past reference picture and a future reference picture may be used simultaneously.
- the current picture, the current picture, and the reference picture information encoded as described above are transmitted to the decoder (S1640).
- FIG. 17 is a flowchart of a video encoding method using inter prediction, according to a ninth embodiment of the present invention.
- a memory list 1 DPB, L1 in which future reference pictures displayed after the current picture are stored
- the current picture is predictively encoded using the reference pictures in L0 and L1 (S1720).
- the current picture is a B picture.
- reference picture information (for example, the syntax of Table 1) used as the reference picture for encoding the current picture is generated (S1730).
- a past reference picture may be used for encoding the current picture, a future reference picture may be used, or a past reference picture and a future reference picture may be used simultaneously.
- the current picture, the current picture, and the reference picture information encoded as described above are transmitted to the decoder (S1740).
- FIG. 18 is a flowchart of a video decoding method using inter prediction, according to a tenth embodiment of the present invention.
- a received signal for a current picture is decoded (S1810), and reference picture information received from an encoder is analyzed.
- a part of images of memories (list 0 DPB, L0) storing past reference images displayed before the current picture is selected, and a memory storing future reference images displayed later than the current picture (list 1 DPB) , L1) is copied (S1820).
- the blocks included in the pictures stored in L0 and L1 are decoded using inter prediction, and are performed based on reference picture information indicating which picture is used as a reference picture for encoding in this process (S1830).
- FIG. 19 is a flowchart of a video decoding method using inter prediction, according to an eleventh embodiment of the present invention.
- a received signal for a current picture is decoded (S1910), and reference picture information received from an encoder is analyzed.
- a part of images of memories (list 1 DPB, L1) storing future reference images displayed after the current picture is selected, and a memory storing past reference images displayed before the current picture (list 0 DPB) , L0) is copied (S1920).
- the blocks included in the pictures stored in L0 and L1 are decoded using inter prediction, and are performed based on reference picture information indicating which picture is used as a reference picture for encoding in this process (S1930).
- FIG. 20 is a flowchart of an inter prediction method according to a twelfth embodiment of the present invention.
- the future reference pictures displayed after the current picture are selected. Copy to the memory (list 1 DPB, L1) (S2010).
- the current picture is predictively encoded and decoded using the reference pictures in L0 and L1 (S2020).
- the current picture is a P picture or a B picture.
- a past reference picture may be used for encoding and decoding the current picture, a future reference picture may be used, or a past reference picture and a future reference picture may be used simultaneously.
- FIG. 21 is a flowchart of an inter prediction method according to a thirteenth embodiment of the present invention.
- the past reference pictures displayed before the current picture are selected. Copy to the memory (list 0 DPB, L0) (S2110).
- the current picture is predictively encoded and decoded using the reference pictures in L0 and L1 (S2120).
- the current picture is a B picture.
- a past reference picture may be used for encoding and decoding the current picture, a future reference picture may be used, or a past reference picture and a future reference picture may be used simultaneously.
- the R picture or the slice header of the R picture may include syntax as shown in Table 1 below (in the embodiment of the present invention, referred to as reference picture information and modified identification information).
- the range of values can be set from 0 to 2, and the affected picture is B P.
- An example of a function of an encoder or a decoder according to a predetermined value of 0 to 2 will be described below.
- the encoder or decoder uses images (decoded) from a past viewpoint than B P as the past reference pictures (List 0 reference picture) of B P based on the display order.
- the decoder does not delete the already decoded images stored in the DPB (Decoded Picture Buffer), but further stores to a predetermined time point and then deletes it. For example, immediately after all or a part of pictures whose display order is before the R picture are decoded among pictures decoded after the R picture, pictures decoded before the R picture and stored in the DPB may be deleted.
- the encoder or decoder erases the already decoded pictures stored in the DPB, transforms the decoded current R picture, and stores the modified R picture in the DPB for use as the past reference picture of B P.
- the encoder or decoder erases already decoded pictures stored in the DPB.
- the image in the future time point than B P based on the display order (the decode will), that is, stored in the DPB for future reference images of B P (List 1 reference picture) only for use as a reference picture for coding or decoding of B P do.
- the range of values can be set from 0 to 3, and the corresponding picture is B P.
- An example of a function of an encoder or a decoder according to a predetermined value among the 0 to 3 will be described below.
- LPF Low Pass Filtering
- zoom-in is applied to the decoded current R picture step by step and then used as a past reference picture of B P.
- zoom-out is applied to the decoded current R picture step by step and then used as a past reference picture of B P.
- the brightness conversion is applied to the decoded current R picture step by step and then used as a past reference picture of B P.
- a syntax element representing a future reference picture used for encoding or decoding B P The range of values may be 0-4, and the picture is B P.
- An example of an encoder or decoder function based on a value is as follows.
- the encoder or decoder uses only the decoded current R picture as a future reference picture (List 1 reference picture) of B P without conversion.
- the decoded current R picture and the decoded current R picture are zoomed in step by step to use the future reference picture of B P.
- the decoded current R picture and the decoded current R picture are applied to the decoded current R picture step by step as a future reference picture of B P.
- the decoded current R picture and the decoded current R picture are applied to the decoded current R picture in stages as future reference pictures of B P.
- the range of values can be set from 0 to 4, and the corresponding picture is B F.
- An example of an encoder or decoder function based on a value is as follows.
- the decoded current R picture and the decoded current R picture are deformed by applying LPF step by step to use the past reference picture of B F or P F.
- the decoded current R picture and the decoded current R picture are zoomed in step by step to use the deformed pictures as a past reference picture of B F or P F.
- the decoded current R picture and the decoded current R picture are transformed by applying the zoom out step by step to use the past reference picture of B F or P F.
- the decoded current R picture and the decoded current R picture are transformed by applying brightness conversion step by step to use the past reference picture of B F or P F.
- LPF, zoom in, zoom out, and brightness value change used in the past_L0_R_pic_process_type, past_L1_process_R_pic_type, and fut_L0_R_pic_ process_type can be applied according to the temporal distance of the display order from the current picture. If the temporal distance of the display order is close, the deformation may be performed with a weak intensity, and if the distance is far, the R deformation may be performed with a strong intensity.
- the deformation of the processing intensity according to the temporal distance of the display order is not limited to the deformation of the R picture with the strong intensity when the distance is close and the weak intensity with the distance.
- the management of the memory that is, the decoded picture buffer (DPB)
- the encoder encodes each picture and the decoder decodes them.
- the encoder selects the values of syntax elements such as past_pic_ref_type, past_L0_R_pic_ process_type, past_L1_R_pic_ process_type or fut_L0_ R_pic_ process_type using an appropriate method, and selects the syntax elements from the picture header, slice header or other appropriate of the bitstream. Include in the bitstream layer.
- the decoder parses these syntax elements and performs a corresponding operation according to the value of each syntax element.
- the encoder and decoder may operate the same according to a predetermined algorithm without introducing a syntax element such as past_pic_ref_type, so that the above-described problem of the conventional IDR picture may be improved in a simpler manner.
- various DPBs can be managed according to the past_pic_ref_type value.
- the function corresponding to the case where the past_pic_ref_type value is '0' is assigned to the encoder and The decoder may do the same.
- an embodiment of the present invention designates a decoded R picture transformation method according to the value of each syntax, the 1: 1 correspondence between the value and the corresponding modification method may be changed according to a defined rule.
- the number of deformation steps of all decoded R pictures may be determined according to the number of reference pictures set by the user.
- a specific frame, all frames, or some frames among the past reference pictures R, B2, B1, B2, and P may be copied for future reference. It can be placed in an image buffer and used for predictive encoding / decoding of the current picture B1.
- various embodiments of the present invention are applied to a video encoding and decoding technique, and are very useful for solving the problem of using an IDR picture for supporting random access, thereby generating an effect of improving encoding and decoding efficiency. Invention.
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Abstract
Description
Claims (23)
- 인터 예측을 이용한 동영상 부호화 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 부호화하는 단계;상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화하는 단계;상기 제 2 픽처보다 먼저 디스플레이되는 과거 화상이 상기 제 2 픽처의 부호화에 참조 화상으로서 사용되는지를 나타내는 참조화상정보를 생성하는 단계; 및상기 부호화된 제 1 및 제 2 픽처와 상기 참조화상정보를 전송하는 단계를 포함하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 1 항에 있어서,상기 제 2 픽처의 부호화에 과거 참조 영상이 사용되는 경우, 상기 참조화상정보는 상기 과거 참조 영상을 나타내는 정보인 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 1 항에 있어서,상기 제 2 픽처의 부호화에 과거 참조 영상이 사용되는 경우, (인코더는) 적어도 상기 제 2 픽처가 부호화된 후에, 상기 제 1 픽처의 부호화 이전에 부호화되고 다시 복호되어 메모리에 저장된 참조 화상들을 삭제하는 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 1항에 있어서,상기 제 1 픽처보다 이전 또는 이후에 디스플레이되는 제 2 픽처를 부호화할 때, 참조 영상들을 저장한 메모리에 현재의 상기 제 2 픽처보다 과거 픽처들이 저장되어 있는 경우 그 저장된 과거 픽처들을 현재의 상기 제 2 픽처의 미래 참조픽처들을 저장하는 메모리로 복사한 후 미래 참조영상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 1항에 있어서,참조 영상들을 저장한 메모리에 현재의 제 2 픽처보다 미래 픽처들이 저장되어 있는 경우, 저장된 미래 참조픽처들을 현재의 제 2 픽처의 과거 참조픽처들을 저장하는 메모리로 복사한 후 현재 제 2 픽처의 과거 참조영상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 1 항 내지 제 5 항 중 한 항에 있어서,상기 제 1 픽처는 IDR 픽처에 대응하는 R 픽처이고, 상기 제 2 픽처는 B 픽처 또는 P 픽처인 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 인터 예측을 이용한 동영상 부호화 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 부호화하는 단계; 및상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화하는 단계를 포함하고,상기 제 2 픽처에 포함된 블록을 인터 예측 부호화하는 단계는, 상기 부호화된 제 1 픽처를 복호하여 얻어진 복호된 제 1 픽처를 변형하여 얻은 하나 이상의 픽처를 참조 화상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 7 항에 있어서,상기 복호된 제 1 픽처의 변형의 유형을 나타내는 변형식별정보를 생성하는 단계; 및상기 부호화된 제 1 및 제 2 픽처와 상기 변형식별정보를 (디코더로) 전송하는 단계를 더 포함하는 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 제 7 항 또는 제 8 항에 있어서,상기 제 1 픽처는 IDR 픽처에 대응하는 R 픽처이고, 상기 제 2 픽처는 B 픽처인 것을 특징으로 하는 인터 예측을 이용한 동영상 부호화 방법.
- 인터 예측을 이용한 동영상 복호화 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 복호화하는 단계; 및상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측을 이용하여 복호화하는 단계를 포함하고,상기 제 2 픽처에 포함된 블록을 복호화하는 단계는, 상기 제 2 픽처보다 먼저 디스플레이되는 과거 화상이 상기 제 2 픽처의 부호화에 참조 화상으로서 사용되었는지를 나타내는 참조화상정보에 기초하여 수행되는 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 제 10 항에 있어서,상기 제 2 픽처의 복호화에 과거 참조영상이 사용되는 경우, 상기 참조화상정보는 상기 과거 참조영상을 나타내는 정보일 수 있고, 상기 제 2 픽처의 복호화에 과거 참조영상이 사용되는 경우 (디코더는) 적어도 상기 제 2 칙처가 복호화된 후에 상기 제 1 픽처의 복호화 이전에 복호화되어 메모리에 저장된 참조 화상들을 삭제하는 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 제 10 항에 있어서,상기 제 1 픽처보다 이전 또는 이후에 디스플레이되는 제 2 픽처를 복호화할 때, 참조 영상들을 저장한 메모리에 현재의 제 2 픽처보다 과거 칙처들이 저장되어 있는 경우 그 저장된 과거 픽처들을 상기 현재의 제 2 픽처의 미래 참조픽처들을 저장하는 메모리로 복사한 후 매리 참조 영상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 제 10 항에 있어서,참조 영상들을 저장한 메모리에 현재의 제 2 픽처보다 미래 픽처들이 저장되어 있는 경우 저장된 미래 참조픽처들을 상기 현재의 제 2 픽처의 과거 참조픽처들을 저장하는 메모리로 복사한 후 상기 현재의 제 2 픽처의 과거 참조영상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 인터 예측을 이용한 동영상 복호화 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 복호화하는 단계; 및상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하고 인터 예측을 이용하여 복호화하는 단계를 포함하고,상기 제 2 픽처에 포함된 블록을 복호화하는 단계는, 상기 복호된 제 1 픽처의 변형의 유형을 나타내는 변형식별정보에 따라 상기 복호화된 제 1 픽처를 변형하여 얻은 픽처를 참조 화상으로 사용하는 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 제 10 항 또는 제 14 항에 있어서,상기 제 1 픽처는 IDR 픽처에 대응하는 R 픽처이고, 상기 제 2 픽처는 B 픽처인 것을 특징으로 하는 인터 예측을 이용한 동영상 복호화 방법.
- 동영상 부호화 또는 복호화시의 인터 예측 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 부호화 또는 복호화하는 단계; 및상기 제 1 픽처를 부호화 또는 복호화한 후에, 상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화 또는 복호화하는 단계를 포함하고,상기 제 2 픽처에 포함된 블록을 인터 예측 부호화 또는 복호화하는 단계는, 상기 부호화된 후 복호화된 또는 상기 복호화된 제 1 픽처를 변형하여 얻은 픽처를 참조 화상으로 사용하는 것을 특징으로 하는 인터 예측 방법.
- 동영상 부호화 또는 복호화시의 인터 예측 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 부호화 또는 복호화하는 단계;상기 제 1 픽처를 부호화 또는 복호화한 후에, 상기 제 1 픽처보다 먼저 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화 또는 복호화하는 단계; 및상기 제 2 픽처의 부호화 또는 복호화에 과거 참조 영상이 사용되는 경우, 상기 제 2 픽처의 부호화 또는 복호화가 완료된 후에, 상기 제 1 픽처의 부호화 이전에 부호화되고 다시 복호되어 메모리에 저장되거나 상기 제 1 픽처의 복호화 이전에 복호화되어 메모리에 저장된 참조 화상들을 삭제하는 단계를 포함하는 것을 특징으로 하는 인터 예측 방법.
- 제 17항에 있어서,상기 제 1 픽처보다 이전 또는 이후에 디스플레이되는 제 2 픽처를 부호화 또는 복호화할 때, 참조 영상들을 저장한 메모리에 현재 제 2 픽처보다 과거 픽처들이 저장되어 있는 경우 저장된 상기 과거 픽처들을 상기 제 2 픽처의 미래 참조픽처들을 저장하는 메모리로 복사한 후 미래 참조영상으로 사용하는 것을 특징으로 하는 인터 예측 방법.
- 제 17항에 있어서,참조 영상들을 저장한 메모리에 현재 제 2 픽처보다 미래 픽처들이 저장되어 있는 경우 저장된 미래 픽처들을 상기 현재 제 2 픽처의 과거 참조픽처들을 저장하는 메모리로 복사한 후 과거 참조 영상으로 사용하는 것을 특징으로 하는 인터 예측 방법.
- 제 16 항 또는 제 17 항에 있어서,상기 제 1 픽처는 IDR 픽처에 대응하는 R 픽처이고, 상기 제 2 픽처는 P 픽처 또는 B 픽처인 것을 특징으로 하는 인터 예측 방법.
- 동영상 부호화 또는 복호화시의 인터 예측 방법에 있어서,랜덤 액세스의 기준이 되는 제 1 픽처를 부호화 또는 복호화하는 단계; 및상기 제 1 픽처를 부호화 또는 복호화한 후에, 상기 제 1 픽처보다 뒤에 디스플레이되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화 또는 복호화하는 단계를 포함하고,상기 제 2 픽처에 포함된 블록을 인터 예측 부호화 또는 복호화하는 단계는, 상기 부호화된 후 복호화된 또는 상기 복호화된 제 1 픽처를 변형하여 얻은 픽처를 참조 화상으로 사용하는 것을 특징으로 하는 인터 예측 방법.
- 동영상 부호화 또는 복호화시의 인터 예측 방법에 있어서,참조 영상으로 사용되는 제 1 픽처를 부호화 또는 복호화하는 단계;상기 제 1 픽처를 부호화 또는 복호화한 후에, 상기 제 1 픽처 후에 부호화 또는 복호화되는 제 2 픽처에 포함된 블록을 복수의 참조 화상을 사용하여 인터 예측 부호화 또는 복호화하는 단계; 및상기 제 2 픽처의 부호화에 과거와 미래 참조 영상이 사용되고, 과거 도는 미래 참조 영상이 존재하지 않을 경우, 상기 제 1 픽처를 복사 또는 변형하여 존재하지 않는 과거 또는 미래 참조 영상으로 사용하는 단계를 포함하는 것을 특징으로 하는 인터 예측 방법.
- 제 22 항에 있어서,상기 제 1 픽처는 인터 픽처의 참조영상으로 사용되는 픽처이고, 상기 제 2 픽처는 B 픽처 또는 P 픽처인 것을 특징으로 하는 인터 예측 방법.
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CN104935922A (zh) | 2015-09-23 |
US9473790B2 (en) | 2016-10-18 |
HK1208769A1 (en) | 2016-03-11 |
US9560379B2 (en) | 2017-01-31 |
CN102845064A (zh) | 2012-12-26 |
WO2011129573A3 (ko) | 2012-03-15 |
EP2938070A1 (en) | 2015-10-28 |
KR101823093B1 (ko) | 2018-01-30 |
US9094690B2 (en) | 2015-07-28 |
CN104853214A (zh) | 2015-08-19 |
CN104935922B (zh) | 2018-05-01 |
EP2560389A2 (en) | 2013-02-20 |
CN102845064B (zh) | 2016-09-28 |
KR20110115949A (ko) | 2011-10-24 |
KR20170073575A (ko) | 2017-06-28 |
US20150222918A1 (en) | 2015-08-06 |
EP2560389A4 (en) | 2013-10-16 |
US20130034156A1 (en) | 2013-02-07 |
US20150222926A1 (en) | 2015-08-06 |
CN104853214B (zh) | 2018-04-03 |
KR101750495B1 (ko) | 2017-06-27 |
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