CN104113753B - Image encoding/decoding method, processing view data method and its equipment - Google Patents
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Abstract
The invention discloses a kind of method for encoding images, picture decoding method, processing view data method and its equipment.The method for encoding images of the present invention includes：It is determined that using the current Intra-coded blocks for constraining infra-frame prediction mode in current inter-frame encoding frame；It is determined that the adjacent encoder block adjacent with the present frame interior coding block includes adjacent inter-coded block；View data in the neighboring intra-blocks included based on fixed value or the adjacent encoder block, processing is updated to the view data in the adjacent inter-coded block；Based on updated view data in the adjacent inter-coded block, the present frame interior coding block is encoded.The equipment for Image Coding of the present invention includes：First determining module, the second determining module, update module and coding module.The error resilience of Intra-coded blocks can be improved using the process and apparatus of the present invention, image data decoding quality is improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to an image encoding method, an image decoding method, a method for processing image data, and an apparatus thereof in the field of communications.
Background
Bit errors or packet loss of video data in wired networks and wireless networks are inevitable, and especially in wireless networks. The video data efficiently compressed by the tools such as variable length coding has great correlation semantically, so that the video data is very sensitive to network errors such as error codes and packet loss, once the error codes are generated in the video data, the recovery of the current video data is influenced, error codes can be diffused in time and space domains, and errors of a certain frame have the effect of error accumulation on subsequent frames due to predictive coding of the video data. Therefore, it is necessary to adopt corresponding measures to improve the error resilience of video data, and particularly, in the case that some video frames have transmission errors, it is necessary to recover the video content from the errors as soon as possible, so as to provide a better subjective experience for users.
The intra refresh method is a relatively simple and effective error recovery method, such as an I-frame refresh method, an I-block refresh method based on random or error tracking, adaptive intra macroblock refresh, etc. I-frames are coded using INTRA-frame (INTRA) coding, and hence may also be referred to as INTRA-coded frames, without reference to other frames, and are suitably compressed to serve as reference points for random access, and may also be referred to as pictures. Because refreshing the whole I frame will cause a frame with a large code rate to appear suddenly in the code stream, which will cause strong code stream impact to the system, in practice, the coding blocks in the frame are mostly refreshed in a manner of partially refreshing the coding blocks in the frame.
P frames in a video frame are encoded using INTER (INTER) coding, and thus may also be referred to as INTER-coded frames. Since inter-frame prediction of a P frame requires reference to a previous P frame, when a transmission error occurs in a certain P frame, the error is transmitted to a subsequent P frame, thereby causing a serious degradation in decoding quality of the subsequent P frame. Therefore, in order to avoid the degradation of decoding quality, an Intra Refresh Frame (abbreviated as "IR" Frame) may be defined in the P Frame, wherein some or all of the coding blocks in the IR Frame are coded by using an Intra coding method, and the coding blocks using Intra coding may also be referred to as Intra Refresh blocks. Thus, an intra-coded block (intra-refresh block) in an IR frame is not coded by directly referring to a P frame preceding the IR frame, but is coded by using an intra-coding scheme by referring to an adjacent coded block of the frame.
However, if an adjacent coding block of an intra coding block is an inter coding block, since the inter coding block still refers to the previous P frame, the inter coding block may accumulate some transmission errors from the previous reference frame and transmit the errors to the intra coding block for refresh, so that the intra coding block is also adversely affected by the transmission errors, thereby greatly reducing the error resilience that the intra refresh method should have, and affecting the decoding quality of image data such as video.
Disclosure of Invention
Therefore, embodiments of the present invention provide an image encoding method, an image decoding method, a method for processing image data, and an apparatus thereof, in which image data in adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is encoded or decoded by using the updated image data, so that error resilience of the intra-frame coding block can be improved, and image data decoding quality can be improved.
In one aspect, an embodiment of the present invention provides an image encoding method, where the method includes: determining a current intra-frame coding block adopting a constrained intra-frame prediction mode in a current inter-frame coding frame; determining that neighboring coding blocks neighboring the current intra coding block include neighboring inter coding blocks; updating the image data in the adjacent intra-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks; and encoding the current intra-coded block based on the updated image data in the adjacent inter-coded blocks.
On the other hand, an embodiment of the present invention further provides an image decoding method, where the method includes: determining a current intra-frame coding block adopting a constrained intra-frame prediction mode in a current inter-frame coding frame; determining that neighboring coding blocks neighboring the current intra coding block include neighboring inter coding blocks; updating the image data in the adjacent intra-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks; decoding the current intra-coded block based on the updated image data in the adjacent inter-coded block.
In another aspect, an embodiment of the present invention further provides a method for processing image data, where the method includes: determining that all coding blocks in a current coding object adopt a constrained intra-frame prediction mode; determining a specific adjacent coding block belonging to a different coding object from a current intra-frame coding block among adjacent coding blocks adjacent to the current intra-frame coding block; determining that the specific adjacent coding block is an adjacent inter-coding block which is coded by adopting an inter-coding mode; updating the image data in the adjacent intra-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks; and encoding or decoding the current intra-coded block based on the updated image data in the adjacent inter-coded blocks.
In still another aspect, an embodiment of the present invention further provides an apparatus for image encoding, where the apparatus includes: the first determining module is used for determining a current intra-frame coding block which adopts a constrained intra-frame prediction mode in a current inter-frame coding frame; a second determining module, configured to determine that neighboring coding blocks neighboring the current intra coding block include neighboring inter coding blocks; the updating module is used for updating the image data in the adjacent inter-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included by the adjacent coding blocks; and the coding module is used for coding the current intra-frame coding block based on the updated image data in the adjacent inter-frame coding block.
In still another aspect, an embodiment of the present invention further provides an apparatus for decoding an image, where the apparatus includes: the first determining module is used for determining a current intra-frame coding block which adopts a constrained intra-frame prediction mode in a current inter-frame coding frame; a second determining module, configured to determine that neighboring coding blocks neighboring the current intra coding block include neighboring inter coding blocks; the updating module is used for updating the image data in the adjacent inter-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included by the adjacent coding blocks; and the decoding module is used for decoding the current intra-coding block based on the updated image data in the adjacent inter-coding block.
In another aspect, an embodiment of the present invention further provides an apparatus for processing image data, where the apparatus includes: the first determining module is used for determining that all coding blocks in the current coding object adopt a constrained intra-frame prediction mode; a second determining module, configured to determine, among adjacent coding blocks adjacent to a current intra-frame coding block, a specific adjacent coding block that belongs to a different coding object from the current intra-frame coding block; a third determining module, configured to determine that the specific adjacent coding block is an adjacent inter-coding block that is coded in an inter-coding manner; the updating module is used for updating the image data in the adjacent inter-frame coding blocks based on a fixed value or the image data in the adjacent intra-frame coding blocks included by the adjacent coding blocks; and the coding and decoding module is used for coding or decoding the current intra-coding block based on the updated image data in the adjacent inter-coding blocks.
Based on the technical scheme, the method and the device of the embodiment of the invention perform updating processing on the image data in the adjacent inter-frame coding blocks, and encode or decode the current intra-frame coding block by adopting the updated image data, so that the inter-frame coding blocks referred by the intra-frame coding blocks can not transmit errors to the intra-frame coding blocks in an accumulated manner, thereby improving the error recovery capability of the intra-frame coding blocks and improving the image data decoding quality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an image encoding method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an update process according to another embodiment of the invention;
FIGS. 4 (a) through (c) are schematic diagrams of an update process according to yet another embodiment of the present invention;
FIG. 5 is a diagram illustrating an image decoding method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a method of processing image data according to an embodiment of the invention;
fig. 7 is a block diagram of an apparatus for image encoding according to an embodiment of the present invention;
fig. 8 is a block diagram of an apparatus for image encoding according to another embodiment of the present invention;
fig. 9 is a block diagram of an apparatus for image decoding according to an embodiment of the present invention;
fig. 10 is a block diagram of an apparatus for image decoding according to another embodiment of the present invention;
fig. 11 is a block diagram of an apparatus for processing image data according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 shows a scenario in which an embodiment of the present invention is applied. As shown in fig. 1, a video frame may include an intra-coded frame (shown as an I-frame in fig. 1) and an inter-coded frame (shown as a P-frame in fig. 1), which may be divided into a plurality of coding blocks, wherein all coding blocks in the intra-coded frame are intra-coded blocks, and coding blocks in the inter-coded frame may include both intra-coded blocks and inter-coded blocks, wherein the intra-coded frame and the intra-coded block are coded or decoded in an intra-coding manner, and the inter-coded frame and the inter-coded block are coded or decoded in an inter-coding manner.
In order to avoid accumulation of transmission errors and thereby ensure the decoding quality of image data, some intra-frame refresh frames (as shown in the IR frame in fig. 1) may be defined in an inter-frame coding frame, and some coding blocks in the intra-frame refresh frame are forced to be coded or decoded in an intra-frame coding manner, and these coding blocks belong to intra-frame coding blocks, which may also be referred to as intra-frame refresh blocks. When the adjacent coding blocks of the intra-coding block are inter-coding blocks, the inter-coding block may have accumulated some transmission errors, and if the inter-coding blocks are directly referred to, the intra-coding block may also be affected by the transmission errors, so that it is difficult to ensure the error recovery capability that the intra-refresh method should have. As shown in fig. 1, the neighboring blocks a and B of the intra-coded block E are erroneous blocks having transmission errors, and in order to avoid accumulation of transmission errors, the reference characteristics of the intra-coded block need to be limited according to an embodiment of the present invention.
Fig. 2 illustrates a schematic diagram of an image encoding method according to an embodiment of the present invention. As shown in fig. 2, the method includes:
in S110, a current intra-coded block in a current inter-coded frame is determined, where the current intra-coded block employs a constrained intra-prediction mode, where the constrained intra-prediction mode is: when encoding, decoding, or predicting an intra-coded block, the reference data of the intra-coded block can be derived only from the image data of an intra-coded block adjacent to the intra-coded block, or a default value (or fixed value) and cannot be derived from the image data of an adjacent inter-coded block.
In S120, it is determined that the adjacent coding blocks adjacent to the current intra-coding block include adjacent inter-coding blocks, wherein the adjacent coding blocks are adjacent to or connected with the current intra-coding block, and for the current intra-coding block, the adjacent coding blocks may generally include a left adjacent coding block, an upper adjacent coding block, a lower left adjacent coding block, and an upper right adjacent coding block. Of course, those skilled in the art will also appreciate that the adjacent coding blocks may further include a right adjacent coding block, a lower adjacent coding block, an upper left adjacent coding block, and a lower right adjacent coding block.
In S130, the image data in the adjacent inter-coded block is subjected to update processing based on a fixed value or the image data in the adjacent intra-coded block included in the adjacent coded block.
In S140, the current intra-coded block is encoded based on the updated image data in the adjacent inter-coded block.
And if the current coding block is determined to be the current intra-frame coding block adopting the constraint intra-frame prediction mode, the coding mode of the adjacent coding block of the current intra-frame coding block is further determined. If the adjacent coding blocks include the inter-coding block, the inter-coding block cannot be used as a reference coding block of the current intra-coding block at the moment, namely, when intra-frame prediction is carried out, the current intra-coding block cannot be predicted by using image data in the inter-coding block. For this reason, before performing intra prediction, update processing may be performed on image data in an adjacent intra-coded block included in the adjacent coded block based on a fixed value or the image data in the adjacent intra-coded block. Thereafter, the current intra-coded block may be encoded based on the updated image data in the adjacent inter-coded block.
After the update process, the image data to be referred to in the inter-coded block may be referred to in a conventional manner, where the image data to be referred to refers to pixels in neighboring blocks that may be used when predicting the current intra-coded block. The image data of the inter-coding block is updated, and the image data to be referred to is not a pixel which is possibly provided with a transmission error in the inter-coding block, so that the image data can be used as a pixel which is referred by the current intra-coding block, the current intra-coding block can be ensured not to refer to the image data in the adjacent inter-coding block, and the transmission error can be prevented from being transmitted to the current intra-coding block.
According to the method provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the error accumulation of the inter-frame coding blocks referred by the intra-frame coding blocks is not transmitted to the intra-frame coding blocks, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality is improved.
In the embodiment of the present invention, it may be determined whether the current coding block is an intra-frame coding block, and if the current coding block is an inter-frame coding block, the current image data processing flow is ended, and the next coding block in the current inter-frame coding frame is subsequently processed. When the current coding block is determined to be the intra-frame coding block, whether the current intra-frame coding block uses a constrained intra-frame prediction mode for prediction is further judged, if not, subsequent updating processing is not needed, and the current process is ended. Optionally, it may also be determined whether the current coding block is predicted by using a constrained intra prediction method, and when it is determined that the current coding block adopts the constrained intra prediction method, the coding method of the current coding block is determined. It is also conceivable for those skilled in the art to determine the encoding mode of the current encoding block and whether to perform prediction, encoding or decoding by using the constrained intra prediction mode.
In the embodiment of the invention, the coding mode of the current coding frame can be judged through the identifier in the code stream during decoding so as to determine whether the current coding frame is an interframe coding frame; during encoding, whether the current encoding frame is an interframe encoding frame can be judged through encoding parameters and an encoding process. Similarly, for judging the coding mode of the coding block, each coding block may have an identifier indicating the coding mode of the coding block, and when decoding, it may be determined whether the current coding block is coded in an intra-frame coding mode according to the coding mode identifier corresponding to the current coding block in the code stream; whether the current coding block is an intra-frame coding block can also be determined by the coding parameters and the coding process when decoding. It will be appreciated by those skilled in the art that other methods known in the art may be used to determine the encoding mode of the encoded frame and the encoded block.
In the embodiment of the present invention, whether the current coding block is coded or decoded by using a Constrained intra prediction mode may be determined according to a Constrained intra prediction Flag (Constrained intra prediction Flag) in the code stream. For example, when the constrained intra prediction flag is 1, it indicates that the current coding block is predicted, encoded or decoded by using a constrained intra prediction mode; when the constraint intra-frame prediction flag is 0, the current coding block is indicated to be not predicted, coded or decoded by adopting a constraint intra-frame prediction mode. It will be appreciated by those skilled in the art that other methods known in the art may be used to determine the constrained intra prediction mode.
Fig. 3 is a schematic diagram illustrating an update process according to an embodiment of the present invention, taking a hierarchical block of High Efficiency Video Coding (HEVC) as an example. When the image data in the adjacent inter-coding block is updated, all the image data in the adjacent inter-coding block may be updated, and optionally, only one row or one column of pixel data in the adjacent inter-coding block that is adjacent to the current intra-coding block may be updated. Those skilled in the art will appreciate that the update process may also be performed for multiple rows or columns of pixel data in adjacent inter-coded blocks.
In the embodiment of the present invention, when performing update processing on image data in adjacent inter-coding blocks, it may be first determined that the adjacent coding blocks further include at least one adjacent intra-coding block, that is, adjacent coding blocks of a current intra-coding block include both inter-coding blocks and intra-coding blocks. At this time, of the at least one neighboring intra-coded block, a neighboring intra-coded block that is closest to the current neighboring intra-coded block may be determined, and the image data in the neighboring intra-coded block may be updated based on the image data in the closest neighboring intra-coded block. Alternatively, the pixel value of the nearest neighboring intra-coded block to the neighboring inter-coded block may be padded in the neighboring inter-coded block.
As shown in diagram (a) in fig. 4, the current intra-coded block E includes four adjacent coded blocks, i.e., an upper left adjacent coded block a, an upper adjacent coded block B, an upper right adjacent coded block C, and a left adjacent coded block D, wherein only the upper right adjacent coded block C is determined as an adjacent intra-coded block. Taking the example of performing the update processing on the image data in the adjacent inter-coding block B, only the upper right adjacent coding block C of the four adjacent coding blocks is an intra-coding block, and at this time, the pixel value closest to the adjacent inter-coding block B in the upper right adjacent coding block C may be filled in the adjacent inter-coding block B. Alternatively, the pixel value may be padded into a row of pixels adjacent to the current intra-coded block E in the adjacent inter-coded block B, as shown in diagram (a) in fig. 4.
When a plurality of intra-coded blocks are included in adjacent coded blocks, as shown in diagram (B) in fig. 4, both the upper right adjacent coded block C and the left adjacent coded block D are adjacent intra-coded blocks, and at this time, when the image data in the adjacent inter-coded block B is subjected to the update processing, it may be determined that the left adjacent coded block D is closest to the adjacent inter-coded block B, and thus the image data in the adjacent inter-coded block B may be updated to the image data in the left adjacent coded block D.
In another embodiment of the present invention, when it is determined that the adjacent coding blocks include at least two adjacent intra-coding blocks, the image data in the adjacent intra-coding blocks may be updated by performing weighted average on distances between the at least two adjacent intra-coding blocks and the current intra-coding block based on the image data in the at least two adjacent intra-coding blocks.
Taking the diagram (C) in fig. 4 as an example, there are adjacent intra-coded blocks on both sides of the adjacent inter-coded block B, i.e. the upper left adjacent coded block a and the upper right adjacent coded block C. Assuming that, in the upper left adjacent coding block a and the upper right adjacent coding block C, the pixel values closest to the adjacent inter-coding block B are Pr and Pl, respectively, and the closest distances to the current pixel of the adjacent inter-coding block B are a and B, respectively, a pixel value R, which can be expressed by formula (1), can be padded in the corresponding current pixel in the adjacent inter-coding block B:
R＝(Pr×a+Pl×b)/(a+b) (1)
in yet another embodiment of the present invention, when the image data in the adjacent inter-coded blocks are subjected to the update processing, the image data in the adjacent inter-coded blocks may be updated to a fixed value, such as 128 or other fixed value, when all the adjacent coded blocks are determined to be inter-coded blocks. Alternatively, after determining that the adjacent coding blocks include the adjacent inter-coding blocks, the image data in all the adjacent coding blocks may be updated to a fixed value directly, regardless of whether the adjacent coding blocks include the adjacent intra-coding blocks.
For the processed adjacent inter-coding block, the image data to be referred to is from a fixed value or an adjacent intra-coding block, so the updated adjacent inter-coding block can be used as a reference coding block of the current intra-coding block. And, the adjacent inter-coded block can be regarded as an intra-coded block. On the other hand, when the image data of another adjacent inter-coded block is updated, the updated image data in the adjacent inter-coded block may be filled in the other adjacent inter-coded block in the above-described manner.
According to the method provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the inter-frame coding blocks referred by the intra-frame coding blocks cannot transmit errors to the intra-frame coding blocks in an accumulated manner, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality is improved; and since an intra-coded block can refer to image data of an adjacent coded block, the method according to the embodiment of the present invention can also improve the coding or decoding efficiency of the intra-coded block.
Fig. 5 illustrates a schematic diagram of an image decoding method according to an embodiment of the present invention. As shown in fig. 5, the method includes:
in S210, a current intra-coded block in a constrained intra-prediction mode in a current inter-coded frame is determined, where the constrained intra-prediction mode is: when encoding, decoding, or predicting an intra-coded block, the reference data of the intra-coded block can be derived only from the image data of an intra-coded block adjacent to the intra-coded block, or a default value (or fixed value) and cannot be derived from the image data of an adjacent inter-coded block.
In S220, it is determined that the adjacent coding blocks adjacent to the current intra-coding block include adjacent inter-coding blocks, where the adjacent coding blocks are adjacent to or connected with the current intra-coding block, and for the current intra-coding block, the adjacent coding blocks may generally include a left adjacent coding block, an upper adjacent coding block, a lower left adjacent coding block, and an upper right adjacent coding block. Of course, those skilled in the art will also appreciate that the adjacent coding blocks may further include a right adjacent coding block, a lower adjacent coding block, an upper left adjacent coding block, and a lower right adjacent coding block.
In S230, the image data in the adjacent inter-coded block is subjected to update processing based on a fixed value or the image data in the adjacent intra-coded block included in the adjacent coded block.
In S240, the current intra-coded block is decoded based on the updated image data in the adjacent inter-coded block.
In the embodiment of the invention, the current coding block can be determined to be coded by adopting an intra-frame coding mode according to the coding mode identifier corresponding to the current coding block of the current inter-frame coding frame in the code stream. Optionally, it may be determined that the current coding block is decoded in a constrained intra prediction manner according to a constrained intra prediction flag in the code stream. Alternatively, the update process may be performed only on one row or one column of pixel data adjacent to the current intra-coded block among the adjacent inter-coded blocks. Those skilled in the art will appreciate that the update process may also be performed for multiple rows or columns of pixel data in adjacent inter-coded blocks.
In the embodiment of the present invention, various update processing methods as shown in fig. 3 to fig. 4 may also be used to update the image data in the adjacent inter-coded blocks, and details are not repeated for brevity.
According to the method provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the error accumulation of the inter-frame coding blocks referred by the intra-frame coding blocks is not transmitted to the intra-frame coding blocks, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality and efficiency are improved.
The following describes an encoding flow and a decoding flow respectively to which the method of the embodiment of the present invention is applied.
In the encoding process, the encoding mode of the current encoding block may be determined according to the encoding parameters and the encoding process, and if the current encoding block is an intra-frame encoding block that is encoded in an intra-frame encoding mode in an inter-frame encoding frame, for example, it may be determined whether the current encoding block is predicted in the constrained intra-frame prediction mode according to a constrained intra-frame prediction flag in a code stream. And judging the coding mode of the adjacent coding block of the current intra-frame coding block using the constrained intra-frame prediction mode. When it is determined that the adjacent coding blocks include an adjacent inter-coding block, the pixel data to be referred to in the inter-coding block may be updated based on a fixed value or image data in the adjacent intra-coding block included in the adjacent coding block. Then, intra prediction can be performed on the current intra coding block to obtain residual data, then transformation and quantization are performed on the residual data to obtain a quantization coefficient, and finally entropy coding can be performed on the quantization coefficient.
In the decoding process, the code stream may be first parsed to obtain a predictive coding mode and a quantization coefficient of a decoded block in the current inter-frame coding frame, and for example, whether the current coding block is coded in an intra-frame coding mode may be determined according to a coding mode identifier corresponding to the current coding block in the code stream. If the current block is an intra-frame coding block, whether the current intra-frame coding block uses a constraint intra-frame prediction mode for prediction, coding or decoding is judged. And judging the coding type of the adjacent coding blocks of the current intra-frame coding block using the constrained intra-frame prediction. When it is determined that the adjacent coding blocks include an adjacent inter-coding block, the pixel data to be referred to in the inter-coding block may be updated based on a fixed value or image data in the adjacent intra-coding block included in the adjacent coding block. Then, intra-frame prediction is carried out on the current intra-frame coding block to obtain prediction data; and carrying out inverse quantization on the quantized coefficient, and carrying out inverse transformation on the coefficient subjected to inverse quantization to obtain residual data. And finally, reconstructing to obtain a decoded image according to the obtained residual data and the prediction data.
The method according to the embodiment of the invention can be applied to the existing Video Coding and decoding standards, such as H.264, Advanced Video Coding (AVC) standard, Audio and Video Standard (AVS), and the established HEVC standard.
The following description will be made in detail by taking an example of application of the image coding method according to an embodiment of the present invention in the HEVC standard. The hierarchical block structure in the HEVC standard may be as shown in fig. 3, and in the HEVC standard, the maximum unit of a coding object may reach 64 × 64, or even larger units. Thus, a left or upper neighboring coding block of an INTRA refresh block (INTRA refresh block) may comprise a plurality of neighboring coding blocks, and of these, there may be both INTRA and inter coding blocks, unlike the h.264/AVC standard. In the h.264/AVC standard, since the coding block type in h.264/AVC is a unit of 16 × 16 coding blocks, there is only one adjacent coding block on a certain side of an intra refresh block, and the adjacent coding block is either an intra coding block or an inter coding block.
In the HEVC standard, intra refresh may be performed within a coding object of a maximum unit of 64 × 64, that is, within one coding object of 64 × 64, a part of coding blocks may be selected for intra coding. For example, when the maximum partition of the encoding object is 64 × 64, if refresh is performed on the current encoding object, all the encoding blocks in the current 64 × 64 encoding object are encoded in the intra-coding manner. In this case, it is not necessary to identify whether the current coding block is coded using the inter-coding scheme or the intra-coding scheme for all the coding blocks in the 64 × 64 coding target, but all the coding blocks in the 64 × 64 coding target are coded using the intra-coding scheme by default. Therefore, it is only necessary to use a symbol of one bit to identify whether the current 64 × 64 coding object is coded using the intra refresh method in the 64 × 64 coding object.
When processing reference image data of adjacent coding blocks, a method similar to that in the previous embodiment may still be used. The difference is that if the adjacent coding block of the current intra-frame coding block and the current intra-frame coding block belong to the same coding object, the adjacent coding block is also the intra-frame coding block, at this time, the updating processing of the reference image data is not needed, and the pixel data of the adjacent coding block can be referred to.
On the other hand, if the adjacent coding block is not in the same encoding object as the current intra-frame coding block and it is determined that the adjacent coding block is encoded or decoded in an inter-frame encoding manner, the image data in the adjacent inter-frame coding block needs to be updated.
As shown in fig. 6, the method for processing image data applied to the HEVC standard includes:
in S310, it is determined that all the intra-coded blocks in the current coding object adopt the constrained intra-prediction mode, where it may be determined that all the intra-coded blocks in the coding object adopt the constrained intra-prediction mode for encoding or decoding according to a constrained intra-prediction flag in the code stream, for example, the constrained intra-prediction flag is 1.
In S320, a specific adjacent coding block belonging to a different encoding object from the current intra coding block is determined among adjacent coding blocks adjacent to the current intra coding block.
In S330, it is determined that the specific adjacent coding block is an adjacent inter coding block encoded in an inter coding manner.
In S340, the image data in the adjacent inter-coded block is updated based on the fixed value or the image data in the adjacent intra-coded block included in the adjacent inter-coded block, wherein the updating of the image data may be performed according to the methods shown in fig. 3 and 4.
In S350, the current intra-coded block is encoded or decoded based on the updated image data in the adjacent inter-coded block.
According to the method provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the error accumulation of the inter-frame coding blocks referred by the intra-frame coding blocks is not transmitted to the intra-frame coding blocks, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality and efficiency are improved.
Those skilled in the art will appreciate that various alternatives or modifications according to fig. 2-5 may also be applied to the method according to fig. 6, which will not be described again for the sake of brevity.
An apparatus for encoding, decoding, and processing image data according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 7 illustrates a block diagram of an apparatus for image encoding according to an embodiment of the present invention. As shown in fig. 7, the apparatus 500 for image decoding includes a first determining module 510, a second determining module 520, an updating module 530, and an encoding module 540, wherein:
a first determining module 510, configured to determine a current intra-coded block in a constrained intra-prediction manner in a current inter-coded frame;
a second determining module 520, configured to determine that neighboring coding blocks neighboring the current intra coding block include neighboring inter coding blocks;
an updating module 530, configured to perform an update process on image data in an adjacent intra-coded block based on a fixed value or the image data in the adjacent intra-coded block included in the adjacent coded block;
and an encoding and decoding module 540, configured to encode the current intra-coded block based on the updated image data in the adjacent inter-coded block.
Optionally, as shown in fig. 8, the apparatus 600 for image decoding includes a first determining module 610, a second determining module 620, an updating module 630 and an encoding module 640, wherein the updating module 630 may further include one or more of the following units or unit combinations: a first determination unit 631 and a first update unit 632; a second determining unit 633 and a second updating unit 634; a third updating unit 635; and a fourth update unit 636, wherein:
a first determining unit 631 for determining that the adjacent coding blocks further include at least one adjacent intra coding block;
a first updating unit 632, configured to update the image data in the adjacent inter-coding block based on the image data in the adjacent intra-coding block that is most adjacent to the adjacent inter-coding block;
a second determining unit 633 for determining that the adjacent coding blocks further include at least two adjacent intra coding blocks;
a second updating unit 634, configured to update the image data in the adjacent inter-coded blocks by performing a weighted average on distances between the at least two adjacent intra-coded blocks and the current intra-coded block based on the image data in the at least two adjacent intra-coded blocks;
a third updating unit 635, configured to update the image data in the adjacent inter-coded block to a fixed value when all the adjacent coded blocks are determined to be inter-coded blocks;
a fourth updating unit 636, configured to update the image data in all the adjacent coding blocks to a fixed value.
The first determining module 610, the second determining module 620 and the encoding module 640 of the apparatus 600 for processing image data are similar to the first determining module 510, the second determining module 520 and the encoding module 540 of the apparatus 500 for processing image data, and the above and other operations and/or functions of the apparatuses 500 and 600 for processing image data are respectively for implementing corresponding flows of the methods in fig. 2 to 5, and are not repeated herein for brevity.
According to the device for image decoding provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the inter-frame coding blocks referred by the intra-frame coding blocks do not transmit errors to the intra-frame coding blocks in an accumulated manner, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality and efficiency can be improved.
Fig. 9 illustrates a block diagram of an apparatus for decoding according to an embodiment of the present invention. As shown in fig. 9, the apparatus 700 for image decoding includes a first determining module 710, a second determining module 720, an updating module 730, and a decoding module 740, wherein:
a first determining module 710, configured to determine a current intra-coded block in a constrained intra-prediction manner in a current inter-coded frame;
a second determining module 720, configured to determine that neighboring coding blocks neighboring the current intra-coding block include neighboring inter-coding blocks;
an updating module 730, configured to update, based on a fixed value or image data in an adjacent intra-frame coding block included in the adjacent coding block, the image data in the adjacent inter-frame coding block;
and a coding and decoding module 740, configured to decode the current intra-coded block based on the updated image data in the adjacent inter-coded block.
Optionally, as shown in fig. 10, the apparatus 800 for decoding includes a first determining module 810, a second determining module 820, an updating module 830 and a decoding module 840, wherein the updating module 830 may further include one or more of the following units or unit combinations: a first determination unit 831 and a first update unit 832; a second determining unit 833 and a second updating unit 834; a third update unit 835; and a fourth updating unit 836, wherein the updating module 830 includes units similar to the updating module 630 of the apparatus 600 for image decoding, and the above and other operations and/or functions of the apparatuses 700 and 800 for decoding are respectively for implementing corresponding flows of the methods in fig. 2 to 5, and are not repeated herein for brevity.
According to the device for decoding provided by the embodiment of the invention, the image data in the adjacent inter-frame coding blocks are updated, and the current intra-frame coding block is coded or decoded by adopting the updated image data, so that the inter-frame coding blocks referred by the intra-frame coding blocks do not transmit errors to the intra-frame coding blocks in an accumulated manner, the error recovery capability of the intra-frame coding blocks can be improved, and the image data decoding quality and efficiency can be improved.
Fig. 11 shows a block diagram of an apparatus for processing image data according to an embodiment of the invention. As shown in fig. 11, the apparatus 900 for processing image data includes:
a first determining module 910, configured to determine that all coding blocks in a current coding object use a constrained intra-frame prediction mode;
a second determining module 920, configured to determine, among adjacent coding blocks adjacent to the current intra-coding block, a specific adjacent coding block that belongs to a different coding object from the current intra-coding block;
a third determining module 930, configured to determine that the specific adjacent coding block is an adjacent inter-coding block that is coded in an inter-coding manner;
an updating module 940, configured to update image data in an adjacent inter-coded block based on a fixed value or image data in the adjacent intra-coded block included in the adjacent coded block;
and an encoding/decoding module 950, configured to encode or decode the current intra-coded block based on the updated image data in the adjacent inter-coded block.
Optionally, the update module 940 may further include one or more of the following units or unit combinations: a first determination unit 941 and a first update unit 942; a second determination unit 943 and a second update unit 944; a third update unit 945; and a fourth updating unit 946, which are similar to the units of the updating module 630 or the updating module 830, and the above and other operations and/or functions of the apparatus 900 for processing image data are respectively for implementing corresponding flows of the respective updating methods in fig. 6, and are not described herein again for brevity.
According to the device for processing the image data, the image data in the adjacent inter-coding blocks are updated, and the current intra-coding block is coded or decoded by adopting the updated image data, so that the inter-coding blocks referred by the intra-coding blocks do not transmit errors to the intra-coding blocks in an accumulated manner, the error recovery capability of the intra-coding blocks can be improved, and the image data decoding quality and efficiency can be improved.
Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The methods or steps described in connection with the embodiments disclosed herein may be embodied in hardware, a software program executed by a processor, or a combination of both. The software routines may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or alterations to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications or alterations are intended to be within the scope of the present invention.
Claims (27)
1. A method of image encoding, the method comprising:
determining a current intra-frame coding block adopting a constrained intra-frame prediction mode in a current inter-frame coding frame;
determining that neighboring coding blocks neighboring the current intra-coded block include neighboring inter-coded blocks, the neighboring coding blocks neighboring the current intra-coded block including: the coding device comprises an upper left adjacent coding block, an upper adjacent coding block, a left adjacent coding block, a lower left adjacent coding block and an upper right adjacent coding block;
updating the image data in the adjacent intra-frame coding blocks based on the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks;
encoding the current intra-frame coding block based on the updated image data in the adjacent inter-frame coding blocks; wherein,
the updating the image data in the adjacent inter-coding blocks includes:
determining that the neighboring coding blocks further include at least one neighboring intra coding block;
and updating the image data in the adjacent inter-coding blocks based on the pixel values which are closest to the adjacent inter-coding blocks in the adjacent intra-coding blocks which are most adjacent to the adjacent inter-coding blocks.
2. The method of claim 1, wherein the current intra-frame coding block is determined to be coded in a constrained intra-frame prediction manner according to a constrained intra-frame prediction flag in a code stream.
3. The method of claim 1, wherein the updating the image data in the adjacent inter-coded blocks comprises:
and updating one row or one column of pixel data adjacent to the current intra-frame coding block in the adjacent inter-frame coding blocks.
4. The method of claim 1,
the determining that neighboring coding blocks that neighbor the current intra-coding block comprise neighboring inter-coding blocks comprises: determining that the upper left adjacent coding block, the upper adjacent coding block and the left adjacent coding block are all adjacent inter-frame coding blocks;
the determining that the neighboring coding blocks further include at least one neighboring intra coding block comprises: determining the upper right adjacent coding block as an adjacent intra-frame coding block;
the updating the image data in the adjacent inter-coding block based on the image data in the adjacent intra-coding block which is most adjacent to the adjacent inter-coding block comprises: and filling the image data in the upper right adjacent coding block into the upper adjacent coding block.
5. The method of claim 4, wherein the padding the image data in the upper right neighboring coding block into the upper neighboring coding block comprises: and filling the pixel value which is closest to the upper adjacent coding block in the upper right adjacent coding block into the upper adjacent coding block.
6. The method according to any one of claims 1 to 3, wherein the method further comprises performing update processing on the image data in the adjacent inter-coded block, and further comprising:
and updating the image data in the adjacent inter-coding blocks to a fixed value when all the adjacent coding blocks are determined to be the inter-coding blocks.
7. The method of any of claims 1-3, wherein the encoding the current intra-coded block based on the updated image data in the neighboring inter-coded blocks comprises:
and performing intra-frame prediction on the current intra-frame coding block based on the updated image data, obtaining residual data according to a prediction result, transforming and quantizing the residual data to obtain a quantized coefficient, and performing entropy coding on the quantized coefficient.
8. A method of image decoding, the method comprising:
determining a current intra-frame coding block adopting a constrained intra-frame prediction mode in a current inter-frame coding frame;
determining that neighboring coding blocks neighboring the current intra-coded block include neighboring inter-coded blocks, the neighboring coding blocks neighboring the current intra-coded block including: the coding device comprises an upper left adjacent coding block, an upper adjacent coding block, a left adjacent coding block, a lower left adjacent coding block and an upper right adjacent coding block;
updating the image data in the adjacent intra-frame coding blocks based on the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks;
decoding the current intra-coded block based on the updated image data in the neighboring inter-coded blocks, wherein,
the updating the image data in the adjacent inter-coding blocks includes:
determining that the neighboring coding blocks further include at least one neighboring intra coding block;
and updating the image data in the adjacent inter-coding blocks based on the pixel values which are closest to the adjacent inter-coding blocks in the adjacent intra-coding blocks which are most adjacent to the adjacent inter-coding blocks.
9. The method of claim 8, wherein the current coding block is determined to be intra-coded according to a coding mode identifier corresponding to the current coding block of the current inter-coded frame in the code stream.
10. The method of claim 8, wherein the current intra-coded block is determined to be coded using constrained intra-prediction according to a constrained intra-prediction flag in the code stream.
11. The method of claim 8, wherein the updating the image data in the adjacent inter-coded blocks comprises:
and updating one row or one column of pixel data adjacent to the current intra-frame coding block in the adjacent inter-frame coding blocks.
12. The method of claim 8,
the determining that neighboring coding blocks that neighbor the current intra-coding block comprise neighboring inter-coding blocks comprises: determining that the upper left adjacent coding block, the upper adjacent coding block and the left adjacent coding block are all adjacent inter-frame coding blocks;
the determining that the neighboring coding blocks further include at least one neighboring intra coding block comprises: determining the upper right adjacent coding block as an adjacent intra-frame coding block;
the updating the image data in the adjacent inter-coding block based on the image data in the adjacent intra-coding block which is most adjacent to the adjacent inter-coding block comprises: and filling the image data in the upper right adjacent coding block into the upper adjacent coding block.
13. The method of claim 12, wherein the padding the image data in the upper right neighboring coding block into the upper neighboring coding block comprises: and filling the pixel value which is closest to the upper adjacent coding block in the upper right adjacent coding block into the upper adjacent coding block.
14. The method according to any one of claims 8 to 10, wherein the updating the image data in the adjacent inter-coded block further comprises:
and updating the image data in the adjacent inter-coding blocks to a fixed value when all the adjacent coding blocks are determined to be the inter-coding blocks.
15. The method of any of claims 8-10, wherein the decoding the current intra-coded block based on the updated image data in the neighboring inter-coded blocks comprises:
and carrying out intra-frame prediction on the current intra-frame coding block based on the updated image data, and reconstructing to obtain a decoded image according to a prediction result and residual data.
16. An apparatus for image encoding, characterized in that the apparatus comprises:
the first determining module is used for determining a current intra-frame coding block which adopts a constrained intra-frame prediction mode in a current inter-frame coding frame;
a second determining module, configured to determine that an adjacent coding block adjacent to the current intra-coding block includes an adjacent inter-coding block, where the adjacent coding block adjacent to the current intra-coding block includes: the coding device comprises an upper left adjacent coding block, an upper adjacent coding block, a left adjacent coding block, a lower left adjacent coding block and an upper right adjacent coding block;
the updating module is used for updating the image data in the adjacent inter-frame coding blocks based on the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks;
the encoding module is used for encoding the current intra-frame encoding block based on the updated image data in the adjacent inter-frame encoding block;
the update module includes:
a first determining unit, configured to determine that the neighboring coding blocks further include at least one neighboring intra coding block;
and the first updating unit is used for updating the image data in the adjacent inter-coding blocks based on the pixel value which is closest to the adjacent inter-coding blocks in the adjacent intra-coding blocks which are most adjacent to the adjacent inter-coding blocks.
17. The apparatus of claim 16, wherein the updating module is configured to update one row or one column of pixel data of the adjacent inter-coded block that is adjacent to the current intra-coded block.
18. The apparatus of claim 16,
the second determining module is configured to determine that the upper left adjacent coding block, the upper adjacent coding block, and the left adjacent coding block are all adjacent inter-frame coding blocks;
the first determining unit is configured to determine that the upper-right adjacent coding block is an adjacent intra-frame coding block;
and the first updating unit is used for filling the image data in the upper right adjacent coding block into the upper adjacent coding block.
19. The apparatus of claim 18,
the first updating unit is used for filling the pixel value which is closest to the upper adjacent coding block in the upper right adjacent coding block into the upper adjacent coding block.
20. The apparatus of claim 16, wherein the update module comprises:
and the third updating unit is used for updating the image data in the adjacent inter-coding blocks to a fixed value when all the adjacent coding blocks are determined to be the inter-coding blocks.
21. The apparatus according to claim 16 or 17,
and the coding module is used for carrying out intra-frame prediction on the current intra-frame coding block based on the updated image data, obtaining residual data according to a prediction result, transforming and quantizing the residual data to obtain a quantized coefficient, and carrying out entropy coding on the quantized coefficient.
22. An apparatus for image decoding, the apparatus comprising:
the first determining module is used for determining a current intra-frame coding block which adopts a constrained intra-frame prediction mode in a current inter-frame coding frame;
a second determining module, configured to determine that an adjacent coding block adjacent to the current intra-coding block includes an adjacent inter-coding block, where the adjacent coding block adjacent to the current intra-coding block includes: the coding device comprises an upper left adjacent coding block, an upper adjacent coding block, a left adjacent coding block, a lower left adjacent coding block and an upper right adjacent coding block;
the updating module is used for updating the image data in the adjacent inter-frame coding blocks based on the image data in the adjacent intra-frame coding blocks included in the adjacent coding blocks;
a decoding module, configured to decode the current intra-coded block based on the updated image data in the adjacent inter-coded block;
the update module includes:
a first determining unit, configured to determine that the neighboring coding blocks further include at least one neighboring intra coding block;
and the first updating unit is used for updating the image data in the adjacent inter-coding blocks based on the pixel value which is closest to the adjacent inter-coding blocks in the adjacent intra-coding blocks which are most adjacent to the adjacent inter-coding blocks.
23. The apparatus of claim 22, wherein the updating module is configured to update one row or one column of pixel data of the adjacent inter-coded block that is adjacent to the current intra-coded block.
24. The apparatus of claim 22,
the second determining module is configured to determine that the upper left adjacent coding block, the upper adjacent coding block, and the left adjacent coding block are all adjacent inter-frame coding blocks;
the first determining unit is configured to determine that the upper-right adjacent coding block is an adjacent intra-frame coding block;
and the first updating unit is used for filling the image data in the upper right adjacent coding block into the upper adjacent coding block.
25. The apparatus of claim 24,
the first updating unit is used for filling the pixel value which is closest to the upper adjacent coding block in the upper right adjacent coding block into the upper adjacent coding block.
26. The apparatus of claim 22, wherein the update module comprises:
and the third updating unit is used for updating the image data in the adjacent inter-coding blocks to a fixed value when all the adjacent coding blocks are determined to be the inter-coding blocks.
27. The apparatus of claim 22 or 23,
and the decoding module is used for carrying out intra-frame prediction on the current intra-frame coding block based on the updated image data and reconstructing to obtain a decoded image according to a prediction result and residual data.
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| WO2007143876A1 (en) * | 2006-06-09 | 2007-12-21 | Thomson Licensing | Method and apparatus for adaptively determining a bit budget for encoding video pictures |
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