CN102611885A - Encoding and decoding method and device - Google Patents
Encoding and decoding method and device Download PDFInfo
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- CN102611885A CN102611885A CN2011100227346A CN201110022734A CN102611885A CN 102611885 A CN102611885 A CN 102611885A CN 2011100227346 A CN2011100227346 A CN 2011100227346A CN 201110022734 A CN201110022734 A CN 201110022734A CN 102611885 A CN102611885 A CN 102611885A
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- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
Abstract
The invention provides an encoding method, which comprises the steps of: dividing a currently encoded object to obtain sub-image blocks arranged in order in the horizontal or vertical direction; obtaining index values of the sub-image blocks; obtaining a reference pixel point required when the sub-image blocks are predicted according to the index values, dimensions of the sub-image blocks and a preset prediction mode, and obtaining a reference pixel value of the reference pixel point; predicting the sub-image blocks according to the reference pixel value and the preset prediction mode to obtain residual error data; performing conversion, quantization and entropy encoding on the residual error data so as to obtain encoded residual error data, and writing division way information of the currently encoded object, the encoded residual error data and the prediction mode of the sub-image blocks into a code stream. By adopting the encoding and decoding method provided by the invention, the reference pixel value is obtained just according to determined reference pixel point during prediction, so that the occurrence of disorder or an error is avoided.
Description
Technical field
The present invention relates to video coding and decoding technology.
Background technology
The basic principle of video coding compression is to utilize the correlation between spatial domain, time domain and the code word, removal redundancy as far as possible.Popular way is to adopt block-based mixed video coding framework at present, realizes the video coding compression through steps such as prediction, conversion, quantification, entropy codings.This coding framework; Shown very strong vitality; From the up-to-date till now video encoding standard of MPEG-1 the earliest H.264/AVC; Even the video coding compression standard HEVC of future generation that formulating of JCTVC working group (joint working group that MPEG and VECG set up), still continue to use this block-based mixed video coding framework.
In coding and decoding video, generally all adopt block-based spatial domain prediction coding techniques, basic principle is that image block to be encoded is divided into many sub-block, utilizes the correlation between image block to be encoded and the adjacent block to remove the spatial domain redundancy then.Promptly utilize adjacent block piece as a reference, subimage block is predicted.
In image block was divided, industry had a kind of division methods, promptly through parallel dividing line the current encoded image piece was divided into the subimage block that along continuous straight runs and vertical direction are arranged in order, and was that unit predicts with these subimage blocks then.Can be in the process of prediction with reference to the new UDI Predicting Technique of releasing of industry; To 225 these intervals of degree, on average select the prediction direction that 34 directions are used as 34 kinds of predictive modes from 45 degree; Predict and all will travel through these 34 predictive modes in each subimage block; Select the minimum prediction direction of for subimage block code rate distortion cost at last,, and obtain the residual error data of the subimage block of corresponding generation as the prediction direction of all pixels in the current subimage block.In the process of prediction, need obtain the reference pixel value of reference image vegetarian refreshments according to predictive mode, obtain the predicted pixel values of subimage block according to this reference pixel value, and and then judge the code rate distortion cost under the current prediction mould.But; The inventor has found a problem when implementing, that is exactly when adopting this method to predict, because subimage block is arranged in regular turn; Because locational difference; Each subimage block corresponding reference pixel is all inequality, and according to the way of prior art, and the pixel value of the reference picture element that can use when then being all subimage blocks predictions with the current encoded image piece all reads in the reference pixel buffer memory; But the prediction of some subimage block only needs the partial reference pixel in the reference pixel buffer memory again, in the process of extracting these reference pixels, just is easy to generate out of order or mistake.
Summary of the invention
The present invention provides a kind of coding method, comprising: the present encoding object is divided, obtained the subimage block that is arranged in order along level or vertical direction; Obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block; According to the dimensions of said index value, said subimage block and preset predictive mode, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments; According to said reference pixel value and preset predictive mode said subimage block is predicted, obtained residual error data; Said residual error data is carried out conversion, quantification and entropy coding, with the residual error data after obtaining encoding; The dividing mode information of present encoding object, residual error data and the prediction mode information of said subimage block behind the said coding are write code stream.
The present invention also provides corresponding coding/decoding method, comprising: from code stream, resolve and obtain residual error data, the dividing mode of current decoder object and the prediction mode information of current decoder object; According to said dividing mode information said current decoder object is divided into the subimage block that along continuous straight runs or vertical direction are arranged in order; Obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block; According to the dimensions and the said predictive mode of said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments; According to said reference pixel value and said residual error data, obtain the reconstructed pixel value of said subimage block.
The present invention also provides the coding and decoding device of using said decoding method.
Adopt decoding method provided by the invention, in prediction, only need to obtain reference pixel value, avoided out of order or wrong generation according to the reference image vegetarian refreshments of confirming.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
The sketch map of the coding method that Fig. 1 provides for the embodiment of the invention.
The sketch map of the coding/decoding method that Fig. 2 provides for the embodiment of the invention.
The sketch map of the code device that Fig. 3 provides for the embodiment of the invention.
The sketch map of the decoding device that Fig. 4 provides for the embodiment of the invention.
Embodiment
Please with reference to Fig. 1, the embodiment of the invention provides a kind of coding method, and it comprises:
Step 101: the present encoding object is divided, obtained the subimage block that is arranged in order along level or vertical direction;
In embodiments of the present invention, the present encoding object is divided into the subimage block that a plurality of along continuous straight runs are arranged in order by many vertical division lines, and perhaps the present encoding object is divided into a plurality of subimage blocks that vertically are arranged in order by many horizontal bar separated times.In embodiments of the present invention, the dimensions of the said subimage block that is arranged in order is identical.
Step 102: obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block;
Such as; The present encoding object is divided into the four number of sub images pieces 0,1,2,3 that are arranged in order; These " 0,1,2,3 " wherein are the index value of subimage block, can obtain the collating sequence of subimage block according to these index values, certainly; Also can obtain the positional information of subimage block according to collating sequence; During such as the four number of sub images pieces 0,1,2,3 that are divided into when the present encoding object that along continuous straight runs is arranged in order, index value is that 0 subimage block just is on the left border of present encoding object, is that 0 subimage block is adjacent and index value is 1 subimage block and index value; Index value is that 3 subimage block is on the right side boundary of present encoding object, and index value is that to be in index value be between 1 and 3 the subimage block for 2 subimage block.Say that from another angle index value also can be used to represent the positional information of subimage block.
Step 103: according to the dimensions of said index value, said subimage block and preset predictive mode, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Said dimensions and preset predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting comprises: according to the preset predictive mode and the dimensions of said subimage block, and the number information of the reference image vegetarian refreshments of acquisitions needs; According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments; According to the start position information and the number information of said reference image vegetarian refreshments, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said coded object, upper right adjacent block, left adjacent block and a left side.Because the angle of the prediction direction of the predictive mode of the leftmost side is 225 degree in the UDI prediction; And the angle of the prediction direction of the predictive mode of the rightmost side is 45 degree, just can obtain the reference picture element in the adjacent block of the present encoding object in the scope that the prediction direction at 34 predictive modes that said UDI predicts contains according to the length of subimage block and wide again.
Since the present encoding object can for reference use adjacent block half thely be adjacent block it on, upper right adjacent block, left adjacent block and the left adjacent block that descends.In embodiments of the present invention, thus the reference picture element of subimage block comprise from the going up of last adjacent block and upper right adjacent block with reference to picture element (set), and from left adjacent block and a left side down the left side of adjacent block with reference to picture element (set).
Wherein, When said present encoding object is divided into the subimage block that along continuous straight runs is arranged in order; Regulation according to the UDI Predicting Technique; The left adjacent block of present encoding object and a left side be the whole pixel as a reference of the pixel on the right side boundary of adjacent block down, and the pixel in the prediction angular coverage of predictive mode in the last adjacent block of present encoding object and the upper right adjacent block could be as the reference image vegetarian refreshments of subimage block.Therefore; Said dimensions and preset predictive mode according to said index value, said subimage block; Confirm that the reference image vegetarian refreshments that needs when said subimage block is predicted comprises:, obtain the last adjacent block of said present encoding object and the number information of the reference point in the upper right adjacent block according to the preset predictive mode and the dimensions of said subimage block; According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said present encoding object; According to the number information and the start position information of the reference image vegetarian refreshments of the last adjacent block of said present encoding object and upper right adjacent block, on said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; According to preset predictive mode; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; Saidly said subimage block is predicted, obtained residual error data and comprise according to said reference pixel value and preset predictive mode: according to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments; Said subimage block is predicted, obtained residual error data.
Relative; When said present encoding object is divided into the subimage block that vertically is arranged in order; Regulation according to the UDI prediction; The borderline pixel of downside of the last adjacent block of present encoding object and upper right adjacent block is pixel as a reference all, and the pixel in the prediction angular coverage of predictive mode in the adjacent block could be as the reference image vegetarian refreshments of subimage block down the left adjacent block of present encoding object and a left side.Therefore; Said dimensions and preset predictive mode according to said index value, said subimage block; Confirm that the reference image vegetarian refreshments that needs when said subimage block is predicted comprises:, obtain the left adjacent block of said present encoding object and the number information of the reference point in the left adjacent block down according to the preset predictive mode and the dimensions of said subimage block; According to the dimensions of said index value and said subimage block, confirm the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said present encoding object; According to the left adjacent block of said present encoding object and a left side number information and the start position information of the reference image vegetarian refreshments of adjacent block down, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; According to preset predictive mode; On said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; Saidly said subimage block is predicted, obtained residual error data and comprise according to said reference pixel value and preset predictive mode: according to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments; Said subimage block is predicted, obtained residual error data.
In embodiments of the present invention, behind the reference pixel value of the reference image vegetarian refreshments that need when said subimage block is predicted to obtain, can the pixel value of said reference image vegetarian refreshments be deposited in the reference pixel buffer memory, extraction gets final product in regular turn in the process of prediction.In other alternate embodiments; Also can all in the adjacent block and present encoding object adjacent pixels point all write in the buffer memory down with the last adjacent block of present encoding object, upper right adjacent block, left adjacent block or a left side; According to the ordering relation of reference image vegetarian refreshments in all pixels of confirming, read successively then.
Step 104: according to said reference pixel value and preset predictive mode said subimage block is predicted, obtained residual error data;
Step 105: said residual error data is carried out conversion, quantification and entropy coding, with the residual error data after obtaining encoding;
Step 106: the dividing mode information of present encoding object, residual error data and the prediction mode information of said subimage block behind the said coding are write code stream.
Said dividing mode information is used to indicate said present encoding object to divide direction, and is concrete, promptly present encoding to as if be divided into the subimage block that along continuous straight runs is arranged in order, still be divided into the subimage block that vertically is arranged in order.Can set default value at the encoding and decoding end as for the quantity of subimage block,, indicate the division direction of said present encoding object and the quantity of said subimage block during perhaps by said dividing mode information of same such as four.
The prediction mode information that in step 106, writes code stream mainly is meant in the process that subimage block is predicted; The reference pixel value and the predicted pixel values that finally obtain in the predictive mode of a kind of code rate distortion cost minimum of needs selection; Obtain the residual error data of subimage block; Decoding end in writing the process of code stream, then needs the information of this predictive mode is also write code stream, so that can adopt the predictive mode identical with coding side to decode.
Can see, adopt the coding method that the embodiment of the invention provided, in prediction,, clearly predict needed with reference to picture element just according to preset predictive mode, the position and the dimensions of subimage block.And in prediction, only need to obtain reference pixel value according to the reference image vegetarian refreshments of confirming, avoided out of order or wrong generation.
Please with reference to Fig. 2, the embodiment of the invention also provides a kind of and above-mentioned coding method corresponding coding/decoding method, and it comprises:
Step 201: from code stream, resolve and obtain residual error data, the dividing mode of current decoder object and the prediction mode information of current decoder object;
Step 202: said current decoder object is divided into the subimage block that along continuous straight runs or vertical direction are arranged in order according to said dividing mode information;
Step 203: obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block;
Step 204: according to the dimensions and the said predictive mode of said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Step 205:, obtain the reconstructed pixel value of said subimage block according to said reference pixel value and said residual error data.
Wherein, In embodiments of the present invention; Said dimensions and said prediction mode information according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting comprises: according to the dimensions of said predictive mode and said subimage block, and the number information of the reference image vegetarian refreshments of acquisitions needs; According to the positional information of said subimage block, confirm the start position information of reference image vegetarian refreshments; According to the start position information and the number information of said reference image vegetarian refreshments, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said decoder object, upper right adjacent block, left adjacent block and a left side.
More specifically; When said current decoder object is divided into the subimage block that along continuous straight runs is arranged in order; Said dimensions and predictive mode according to said index value, said subimage block; Confirm that the reference image vegetarian refreshments that needs when said subimage block is predicted comprises:, obtain the last adjacent block of said current decoder object and the number information of the reference point in the upper right adjacent block according to the dimensions of said predictive mode and said subimage block; According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said current decoder object; According to the number information and the start position information of the reference image vegetarian refreshments of the last adjacent block of said current decoder object and upper right adjacent block, on said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; According to preset predictive mode, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side.According to said reference pixel value and said residual error data; The reconstructed pixel value that obtains said subimage block comprises: according to the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments; And said residual error data, obtain the reconstructed pixel value of said subimage block.
When said current decoder object is divided into the subimage block that vertically is arranged in order; Said dimensions and said predictive mode according to said index value, said subimage block; Confirm that the reference image vegetarian refreshments that needs when said subimage block is predicted comprises:, obtain the left adjacent block of said current decoder object and the number information of the reference point in the left adjacent block down according to the dimensions of predictive mode and said subimage block; According to the dimensions of said index value and said subimage block, confirm the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said current decoder object; According to the left adjacent block of said current decoder object and a left side number information and the start position information of the reference image vegetarian refreshments of adjacent block down, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side; According to said predictive mode, on said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments.According to said reference pixel value and said residual error data; The reconstructed pixel value that obtains said subimage block comprises: according to the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments; And said residual error data, obtain the reconstructed pixel value of said subimage block.
Please with reference to Fig. 3, the embodiment of the invention also provides the code device of using above-mentioned coding method, and it comprises:
Index value obtains module 302, is used to obtain the index value of said subimage block, and wherein, said index value is used to represent the sequencing information of said subimage block;
Reference pixel value obtains module 303; Be used for dimensions and preset predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Residual error data obtains module 304, is used for according to said reference pixel value and preset predictive mode said subimage block being predicted, obtains residual error data, and said residual error data is carried out conversion, quantification and entropy coding, with the residual error data after obtaining encoding;
Write code stream module 305, be used for the dividing mode information of present encoding object, residual error data and the prediction mode information of said subimage block behind the said coding are write code stream.
Further, said reference pixel value obtains module 303 and also comprises:
Number obtains submodule, is used for according to the preset predictive mode and the dimensions of said subimage block the number information of the reference image vegetarian refreshments that acquisition needs;
The position obtains submodule, is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments; And
Obtain submodule with reference to picture element, be used for start position information and number information, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said coded object, upper right adjacent block, left adjacent block and a left side according to said reference image vegetarian refreshments.
Concrete; When said present encoding object is divided into the subimage block that along continuous straight runs is arranged in order; Said number obtains submodule according to the preset predictive mode and the dimensions of said subimage block, obtains the last adjacent block of said present encoding object and the number information of the reference point in the upper right adjacent block; Said position obtains the dimensions of submodule according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said present encoding object; Saidly obtain number information and the start position information of submodule according to the reference image vegetarian refreshments of the last adjacent block of said present encoding object and upper right adjacent block with reference to picture element; On said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; And according to preset predictive mode, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side.And corresponding, at this time, residual error data obtains 304 of modules according to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said subimage block is predicted, obtains residual error data.
When said present encoding object is divided into the image subsection piece that vertically is arranged in order; Number obtains submodule according to the preset predictive mode and the dimensions of said subimage block, obtains the left adjacent block of said present encoding object and the number information of the reference point in the left adjacent block down; The position obtains the dimensions of submodule according to said index value and said subimage block, confirms the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said present encoding object; Obtain the left adjacent block and left down number information and the start position information of the reference image vegetarian refreshments of adjacent block of submodule with reference to picture element according to said present encoding object; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; And according to preset predictive mode, on said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments.At this time, corresponding residual error data obtains 304 of modules according to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said subimage block is predicted, obtains residual error data.
Please with reference to Fig. 4, the embodiment of the invention also provides a kind of decoding device of using above-mentioned coding/decoding method, and it comprises:
Parameter obtains module 401, is used for resolving acquisition residual error data, the dividing mode of current decoder object and the prediction mode information of current decoder object from code stream;
Index value obtains module 403, is used to obtain the index value of said subimage block, and wherein, said index value is used to represent the sequencing information of said subimage block;
The reference image vegetarian refreshments obtains module 404; Be used for dimensions and said predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Reconstructed module 405 is used for obtaining the reconstructed pixel value of said subimage block according to said reference pixel value and said residual error data.
Further, said reference pixel value obtains module 404 and also comprises:
Number obtains submodule, is used for the dimensions according to said predictive mode and said subimage block, the number information of the reference image vegetarian refreshments that acquisition needs;
The position obtains submodule, is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments; And
Obtain submodule with reference to picture element, be used for start position information and number information, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said current decoder object, upper right adjacent block, left adjacent block and a left side according to said reference image vegetarian refreshments.
Concrete; When said current decoder object is divided into the subimage block that along continuous straight runs is arranged in order; Said number obtains the dimensions of submodule according to predictive mode and said subimage block, obtains the last adjacent block of said current decoder object and the number information of the reference point in the upper right adjacent block; Said position obtains the dimensions of submodule according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said current decoder object; Saidly obtain number information and the start position information of submodule according to the reference image vegetarian refreshments of the last adjacent block of said current decoder object and upper right adjacent block with reference to picture element; On said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; And according to predictive mode, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side.And corresponding, at this time, 405 reference pixel values according to said top reference image vegetarian refreshments and left reference image vegetarian refreshments of reconstructed module, and said residual error data obtain the reconstructed pixel value of said subimage block.
When said current decoder object is divided into the image subsection piece that vertically is arranged in order; Number obtains the dimensions of submodule according to predictive mode and said subimage block, obtains the left adjacent block of said current decoder object and the number information of the reference point in the left adjacent block down; The position obtains the dimensions of submodule according to said index value and said subimage block, confirms the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said current decoder object; Obtain the left adjacent block and left down number information and the start position information of the reference image vegetarian refreshments of adjacent block of submodule with reference to picture element according to said current decoder object; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side; And according to predictive mode, on said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments.And corresponding, at this time, 405 reference pixel values according to said top reference image vegetarian refreshments and left reference image vegetarian refreshments of reconstructed module, and said residual error data obtain the reconstructed pixel value of said subimage block.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product can be stored in the storage medium, like ROM/RAM, magnetic disc, CD etc., comprises that some instructions are with so that a computer equipment (can be a personal computer; Server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (20)
1. a coding method is characterized in that, comprising:
The present encoding object is divided, obtained the subimage block that is arranged in order along level or vertical direction;
Obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block;
According to the dimensions of said index value, said subimage block and preset predictive mode, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
According to said reference pixel value and preset predictive mode said subimage block is predicted, obtained residual error data;
Said residual error data is carried out conversion, quantification and entropy coding, with the residual error data after obtaining encoding;
The dividing mode information of present encoding object, residual error data and the prediction mode information of said subimage block behind the said coding are write code stream.
2. the coding method described in claim 1; It is characterized in that; Said dimensions and preset predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the preset predictive mode and the dimensions of said subimage block, the number information of the reference image vegetarian refreshments that acquisition needs;
According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments;
According to the start position information and the number information of said reference image vegetarian refreshments, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said coded object, upper right adjacent block, left adjacent block and a left side.
3. the coding method described in claim 1 is characterized in that, when said present encoding object is divided into the subimage block that along continuous straight runs is arranged in order,
Said dimensions and preset predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the preset predictive mode and the dimensions of said subimage block, obtain the last adjacent block of said present encoding object and the number information of the reference point in the upper right adjacent block;
According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said present encoding object;
Number information and start position information according to the reference image vegetarian refreshments of the last adjacent block of said present encoding object and upper right adjacent block; On said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; Wherein, said top is the said reference image vegetarian refreshments of going up in adjacent block and the upper right adjacent block of being in of said subimage block with reference to picture element;
According to preset predictive mode; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; Wherein, said left reference image vegetarian refreshments is the reference image vegetarian refreshments in the adjacent block under a said left adjacent block of being in of said subimage block and the left side
Saidly said subimage block is predicted, is obtained residual error data and comprise according to said reference pixel value and preset predictive mode:
According to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, said subimage block is predicted, obtain residual error data.
4. the coding method described in claim 3 is characterized in that, when said present encoding object is divided into the subimage block that vertically is arranged in order,
Said dimensions and preset predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the preset predictive mode and the dimensions of said subimage block, obtain the left adjacent block of said present encoding object and the number information of the reference point in the left adjacent block down;
According to the dimensions of said index value and said subimage block, confirm the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said present encoding object;
According to the left adjacent block of said present encoding object and a left side number information and the start position information of the reference image vegetarian refreshments of adjacent block down, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side;
According to preset predictive mode, on said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments;
Saidly said subimage block is predicted, is obtained residual error data and comprise according to said reference pixel value and preset predictive mode:
According to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, said subimage block is predicted, obtain residual error data.
5. the coding method described in claim 3; It is characterized in that, when the said subimage block of confirming according to said predictive mode is predicted the reference image vegetarian refreshments of needs comprise the last adjacent block of said subimage block, upper right adjacent block, left adjacent block and a left side time adjacent block in one or more adjacent blocks in pixel.
6. the coding method described in claim 1; It is characterized in that; Said dimensions and preset predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the ordering of said subimage block, obtain the index value of said subimage block;
According to the dimensions of said index value and said image subsection piece, obtain the positional information of said subimage block;
According to the dimensions of said positional information, said subimage block and preset predictive mode, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments.
7. a coding/decoding method is characterized in that, comprising:
From code stream, resolve and obtain residual error data, the dividing mode of current decoder object and the prediction mode information of current decoder object;
According to said dividing mode information said current decoder object is divided into the subimage block that along continuous straight runs or vertical direction are arranged in order;
Obtain the index value of said subimage block, wherein, said index value is used to represent the sequencing information of said subimage block;
According to the dimensions and the said predictive mode of said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
According to said reference pixel value and said residual error data, obtain the reconstructed pixel value of said subimage block.
8. the coding/decoding method described in claim 7; It is characterized in that; Said dimensions and said predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the dimensions of said predictive mode and said subimage block, the number information of the reference image vegetarian refreshments that acquisition needs;
According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments;
According to the start position information and the number information of said reference image vegetarian refreshments, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said decoder object, upper right adjacent block, left adjacent block and a left side.
9. the coding/decoding method described in claim 7 is characterized in that, when said current decoder object is divided into the subimage block that along continuous straight runs is arranged in order,
Said dimensions and said predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the dimensions of said predictive mode and said subimage block, obtain the last adjacent block of said current decoder object and the number information of the reference point in the upper right adjacent block;
According to the dimensions of said index value and said subimage block, confirm the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said current decoder object;
Number information and start position information according to the reference image vegetarian refreshments of the last adjacent block of said current decoder object and upper right adjacent block; On said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; Wherein, said top is the said reference image vegetarian refreshments of going up in adjacent block and the upper right adjacent block of being in of said subimage block with reference to picture element;
According to said predictive mode; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side; Wherein, said left reference image vegetarian refreshments is the reference image vegetarian refreshments in the adjacent block under a said left adjacent block of being in of said subimage block and the left side
According to said reference pixel value and said residual error data, the reconstructed pixel value that obtains said subimage block comprises:
According to the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said residual error data, obtain the reconstructed pixel value of said subimage block.
10. the coding/decoding method described in claim 9 is characterized in that, when said current decoder object is divided into the subimage block that vertically is arranged in order,
Said dimensions and said predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the dimensions of predictive mode and said subimage block, obtain the left adjacent block of said current decoder object and the number information of the reference point in the left adjacent block down;
According to the dimensions of said index value and said subimage block, confirm the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said current decoder object;
According to the left adjacent block of said current decoder object and a left side number information and the start position information of the reference image vegetarian refreshments of adjacent block down, the left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side;
According to said predictive mode, on said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments,
According to said reference pixel value and said residual error data, the reconstructed pixel value that obtains said subimage block comprises:
According to the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said residual error data, obtain the reconstructed pixel value of said subimage block.
11. the coding/decoding method described in claim 9; It is characterized in that, when the said subimage block of confirming according to said predictive mode is predicted the reference image vegetarian refreshments of needs comprise the last adjacent block of said word image piece, upper right adjacent block, left adjacent block and a left side time adjacent block in one or more adjacent blocks in pixel.
12. the coding/decoding method described in claim 7; It is characterized in that; Said dimensions and said predictive mode according to said index value, said subimage block; The reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and the reference pixel value that obtains said reference image vegetarian refreshments comprises:
According to the ordering of said subimage block, obtain the index value of said subimage block;
According to the dimensions of said index value and said image subsection piece, obtain the positional information of said subimage block;
According to the dimensions and the said predictive mode of said positional information, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments.
13. a code device is characterized in that, comprising:
Divide module, be used for the present encoding object is divided, obtain the subimage block that is arranged in order along level or vertical direction;
Index value obtains module, is used to obtain the index value of said subimage block, and wherein, said index value is used to represent the sequencing information of said subimage block;
Reference pixel value obtains module, is used for dimensions and preset predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Residual error data obtains module, is used for according to said reference pixel value and preset predictive mode said subimage block being predicted, obtains residual error data, and said residual error data is carried out conversion, quantification and entropy coding, with the residual error data after obtaining encoding;
Write the code stream module, be used for the dividing mode information of present encoding object, residual error data and the prediction mode information of said subimage block behind the said coding are write code stream.
14. the code device described in claim 13 is characterized in that, said reference pixel value obtains module and comprises:
Number obtains submodule, is used for according to the preset predictive mode and the dimensions of said subimage block the number information of the reference image vegetarian refreshments that acquisition needs;
The position obtains submodule, is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments; And
Obtain submodule with reference to picture element, be used for start position information and number information, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said coded object, upper right adjacent block, left adjacent block and a left side according to said reference image vegetarian refreshments.
15. the code device described in claim 14 is characterized in that, when said present encoding object is divided into the subimage block that along continuous straight runs is arranged in order,
Said number obtains submodule and is used for obtaining the last adjacent block of said present encoding object and the number information of the reference point in the upper right adjacent block according to the preset predictive mode and the dimensions of said subimage block;
Said position obtains submodule and is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said present encoding object;
Saidly obtain submodule with reference to picture element and be used for number information and start position information according to the reference image vegetarian refreshments of the last adjacent block of said present encoding object and upper right adjacent block; On said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; And according to preset predictive mode; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; Wherein, Said left reference image vegetarian refreshments is the reference image vegetarian refreshments in the adjacent block under a said left adjacent block of being in of said subimage block and the left side, and said top is the said reference image vegetarian refreshments of going up in adjacent block and the upper right adjacent block of being in of said subimage block with reference to picture element
Said residual error data obtains module according to said preset predictive mode, and the reference pixel value of said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said subimage block is predicted, obtains residual error data.
16. the code device described in claim 13; It is characterized in that, when the said subimage block of confirming according to said predictive mode is predicted the reference image vegetarian refreshments of needs comprise the last adjacent block of said subimage block, upper right adjacent block, left adjacent block and a left side time adjacent block in one or more adjacent blocks in pixel.
17. a decoding device is characterized in that, comprising:
Parameter obtains module, is used for resolving acquisition residual error data, the dividing mode of current decoder object and the prediction mode information of current decoder object from code stream;
Divide module, be used for said current decoder object being divided into the subimage block that along continuous straight runs or vertical direction are arranged in order according to said dividing mode information;
Index value obtains module, is used to obtain the index value of said subimage block, and wherein, said index value is used to represent the sequencing information of said subimage block;
The reference image vegetarian refreshments obtains module, is used for dimensions and said predictive mode according to said index value, said subimage block, the reference image vegetarian refreshments that needs when obtaining said subimage block and predicting, and obtain the reference pixel value of said reference image vegetarian refreshments;
Reconstructed module is used for obtaining the reconstructed pixel value of said subimage block according to said reference pixel value and said residual error data.
18. the decoding device described in claim 17 is characterized in that, said reference pixel obtains module and comprises:
Number obtains submodule, is used for the dimensions according to said predictive mode and said subimage block, the number information of the reference image vegetarian refreshments that acquisition needs;
The position obtains submodule, is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments; And
Obtain submodule with reference to picture element, be used for start position information and number information, obtain the reference image vegetarian refreshments the adjacent block down from the last adjacent block of said coded object, upper right adjacent block, left adjacent block and a left side according to said reference image vegetarian refreshments.
19. the decoding device described in claim 18 is characterized in that, when said present encoding object is divided into the subimage block that along continuous straight runs is arranged in order,
Said number obtains submodule and is used for the dimensions according to predictive mode and said subimage block, obtains the last adjacent block of said present encoding object and the number information of the reference point in the upper right adjacent block;
Said position obtains submodule and is used for the dimensions according to said index value and said subimage block, confirms the start position information of reference image vegetarian refreshments of last adjacent block and the upper right adjacent block of said present encoding object;
Saidly obtain submodule with reference to picture element and be used for number information and start position information according to the reference image vegetarian refreshments of the last adjacent block of said present encoding object and upper right adjacent block; On said present encoding object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments; And according to predictive mode; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said present encoding object and a left side; Wherein, Said left reference image vegetarian refreshments is the reference image vegetarian refreshments in the adjacent block under a said left adjacent block of being in of said subimage block and the left side, and said top is the said reference image vegetarian refreshments of going up in adjacent block and the upper right adjacent block of being in of said subimage block with reference to picture element;
Said reconstructed module is used for the reference pixel value according to said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said residual error data, obtains the reconstructed pixel value of said subimage block.
20. the decoding device described in claim 19 is characterized in that, when said current decoder object is divided into the image subsection piece that vertically is arranged in order,
Said number obtains submodule and is used for the dimensions according to predictive mode and said subimage block, obtains the left adjacent block of said current decoder object and the number information of the reference point in the left adjacent block down;
Said position obtains submodule and is used for the positional information according to said subimage block, confirms the left adjacent block and the left start position information of the reference image vegetarian refreshments of adjacent block down of said current decoder object;
Saidly obtain submodule with reference to picture element and be used for according to the left adjacent block of said current decoder object and a left side number information and the start position information of the reference image vegetarian refreshments of adjacent block down; The left reference image vegetarian refreshments of the said subimage block of acquisition in the adjacent block down on the left adjacent block of said current decoder object and a left side; And according to predictive mode, on said current decoder object, obtain in adjacent block and the upper right adjacent block said subimage block above the reference image vegetarian refreshments;
Said reconstructed module is used for the reference pixel value according to said top reference image vegetarian refreshments and left reference image vegetarian refreshments, and said residual error data, obtains the reconstructed pixel value of said subimage block.
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| WO2012097746A1 (en) | 2012-07-26 |
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