CN101998119B - Method and device for acquiring reconstructed image - Google Patents
Method and device for acquiring reconstructed image Download PDFInfo
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- CN101998119B CN101998119B CN2010102557030A CN201010255703A CN101998119B CN 101998119 B CN101998119 B CN 101998119B CN 2010102557030 A CN2010102557030 A CN 2010102557030A CN 201010255703 A CN201010255703 A CN 201010255703A CN 101998119 B CN101998119 B CN 101998119B
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Abstract
The invention provides a method for acquiring a reconstructed image. The method comprises the following steps of: reducing an enhancement layer image into a base layer image; selecting an interframe encoding mode to encode the base layer image; acquiring a reconstructed image of the base layer image; magnifying the reconstructed image of the base layer image to the size of the enhancement layer image by utilizing an interpolation filter to obtain a forecast image of the enhancement layer image; subtracting the forecast image of the enhancement layer image from the enhancement layer image to acquire an image differential value; encoding the acquired image differential value; and summing the forecast image of the enhancement layer image and the encoded image differential value to obtain a reconstructed image of the enhancement layer image. By adopting the invention, the image quality is better than that without being treated with the method under the same code flow rate; and under the same quality, the code flow rate is lower than that without being treated with the method.
Description
Technical field
The present invention relates to technical field of audio/video coding, particularly restructuring graph acquisition methods and device.
Background technology
Video coding based on simple layer can not meet in monitoring application, the various Video service under Stream Media Application and heterogeneous networks bandwidth.Although H.264 international standard comprises the technical description of scalable video, with basic tomographic image, predicting in the enhancement layer image situation, it requires the image of basic layer to select intra-frame encoding mode, define so a lot of applied environments, select intra-frame encoding mode in some applied environment, to make coding too complicated, and this kind of restructuring graph Forecasting Methodology utilance is lower.
Summary of the invention
Purpose of the present invention is intended at least solve H.264 middle coding techniques complexity, the technological deficiency that restructuring graph Forecasting Methodology utilance is low.
For achieving the above object, the present invention proposes the restructuring graph acquisition methods, enhancement layer image is reduced into to basic tomographic image, select interframe encoding mode to be encoded to described basic tomographic image, obtain basic tomographic image restructuring graph, utilize interpolation filter that basic tomographic image restructuring graph is amplified to the enhancement layer image size, the predicted picture of tomographic image is enhanced, enhancement layer image is deducted to the predicted picture of enhancement layer image, obtain the image level difference, the image level difference of obtaining is encoded, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of tomographic image is enhanced.
As one embodiment of the present of invention, dividing described enhancement layer image is some macro blocks, and dividing basic tomographic image is some macro blocks.
As one embodiment of the present of invention, the encode macro block of basic tomographic image, basic layer macro block after coding is amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block is enhanced, enhancement layer macro block is deducted to the predicted macroblock of enhancement layer macro block, obtain the macro-block level difference, and this macro-block level difference is encoded, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.
As one embodiment of the present of invention, select in frame or interframe encoding mode is encoded to the macro block of basic tomographic image.
As one embodiment of the present of invention, described scalable video is adapted to two tomographic images or the two-layer Video coding with epigraph.
On the other hand, the present invention also provides the restructuring graph deriving means, and this device comprises:
Image dwindles unit, and enhancement layer image is reduced into to basic tomographic image;
Basic tomographic image reconfiguration unit, select interframe encoding mode to be encoded to described basic tomographic image, obtains basic tomographic image restructuring graph;
The predicted picture acquiring unit, utilize interpolation filter basic tomographic image restructuring graph to be amplified to the enhancement layer image size, the predicted picture of the tomographic image that is enhanced;
Image level differential coding unit, deduct enhancement layer image the predicted picture of enhancement layer image, obtains the image level difference, and the image level difference of obtaining is encoded;
The enhancement layer image reconfiguration unit, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of the tomographic image that is enhanced.
As one embodiment of the present of invention, this device also comprises the macroblock partitions unit, for dividing described enhancement layer image, is some macro blocks, and dividing basic tomographic image is some macro blocks.
As one embodiment of the present of invention, this device also comprises:
The macroblock coding unit, the macro block of the basic tomographic image of encoding;
The predicted macroblock acquiring unit, be amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block that be enhanced by the basic layer macro block after coding;
Macro-block level differential coding unit, deduct enhancement layer macro block the predicted macroblock of enhancement layer macro block, obtains the macro-block level difference, and this macro-block level difference is encoded;
The macro block reconfiguration unit, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.
As one embodiment of the present of invention, select in frame or interframe encoding mode is encoded to the macro block of basic tomographic image.
As one embodiment of the present of invention, described scalable video is adapted to two tomographic images or the two-layer Video coding with epigraph.
The present invention is by being reduced into enhancement layer image basic tomographic image, select interframe encoding mode to be encoded to described basic tomographic image, obtain basic tomographic image restructuring graph, utilize interpolation filter that basic tomographic image restructuring graph is amplified to the enhancement layer image size, the predicted picture of tomographic image is enhanced, enhancement layer image is deducted to the predicted picture of enhancement layer image, obtain the image level difference, the image level difference of obtaining is encoded, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of the tomographic image that is enhanced.The Multi-encoding mode is provided, has improved code efficiency.In other words, if adopted the present invention, under same rate bit stream, picture quality can be than not adopting the good of this method; Under same quality, rate bit stream can be than not adopting the low of this method.
The aspect that the present invention is additional and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
The accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
The flow chart that Fig. 1 is restructuring graph acquisition methods embodiment;
Fig. 2 is restructuring graph deriving means structure chart.
Embodiment
Below describe embodiments of the invention in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label means same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
As shown in Figure 1, the flow chart of the inventive method embodiment is as follows:
S101, be reduced into basic tomographic image by enhancement layer image.
The size of supposing basic tomographic image is the relation of 2 times with the size of enhancement layer image, and the present invention is not limited to the relation of 2 times certainly.Such as, enhancement layer image is of a size of 640*480, and the basic tomographic image after dwindling is of a size of 320*240.
S102, select interframe encoding mode to be encoded to described basic tomographic image, obtains basic tomographic image restructuring graph.
To the basic tomographic image of above-mentioned 320*240, adopt interframe encoding mode to be encoded, can utilize P frame or B frame encoding mode to be encoded, obtained basic tomographic image restructuring graph
S103, utilize interpolation filter that basic tomographic image restructuring graph is amplified to the enhancement layer image size, the predicted picture of the tomographic image that is enhanced,
Particularly, utilize 4 tap filters (1,9,9 ,-1)/16 to be amplified to 640*480, the predicted picture of the tomographic image that is enhanced with the basic tomographic image restructuring graph that vertical direction is obtained S102 in the horizontal direction.
S104, deduct enhancement layer image the predicted picture of enhancement layer image, obtains the image level difference, the image level difference of obtaining is encoded,
S105, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of the tomographic image that is enhanced.
As a preferred embodiment of the present invention, described enhancement layer image is divided into to some macro blocks, basic tomographic image also is divided into to some macro blocks.
Adopt in frame or the encode macro block of basic tomographic image of interframe encoding mode,, in the situation that basic tomographic image adopts P frame or B frame coding, the macro block of described basic tomographic image adopts in frame or inter-frame mode is encoded.That is, basic tomographic image adopts P frame coding, and the macro block of described basic tomographic image can adopt in frame or coded in inter mode; Basic tomographic image adopts B frame coding, and the macro block of described basic tomographic image can adopt in frame, interframe or two-way coded in inter mode.
Basic layer macro block after coding is amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block is enhanced, enhancement layer macro block is deducted to the predicted macroblock of enhancement layer macro block, obtain the macro-block level difference, and this macro-block level difference is encoded, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.By the be enhanced restructuring graph of tomographic image of the restructuring graph addition of all enhancement layer macro blocks.
On the other hand, the present invention also provides the restructuring graph deriving means, and this device comprises:
Basic tomographic image reconfiguration unit 202, select interframe encoding mode to be encoded to described basic tomographic image, obtains basic tomographic image restructuring graph;
Predicted picture acquiring unit 203, utilize interpolation filter basic tomographic image restructuring graph to be amplified to the enhancement layer image size, the predicted picture of the tomographic image that is enhanced;
Image level differential coding unit 204, deduct enhancement layer image the predicted picture of enhancement layer image, obtains the image level difference, and the image level difference of obtaining is encoded;
Enhancement layer image reconfiguration unit 205, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of the tomographic image that is enhanced.
As a preferred embodiment of the present invention, this device also comprises the macroblock partitions unit, for dividing described enhancement layer image, is some macro blocks, and dividing basic tomographic image is some macro blocks.
After utilizing the macroblock partitions unit that image is divided into to some macro blocks, this device also comprises:
The macroblock coding unit, the macro block of the basic tomographic image of encoding;
The predicted macroblock acquiring unit, be amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block that be enhanced by the basic layer macro block after coding;
Macro-block level differential coding unit, deduct enhancement layer macro block the predicted macroblock of enhancement layer macro block, obtains the macro-block level difference, and this macro-block level difference is encoded;
The macro block reconfiguration unit, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.
As one embodiment of the present of invention, select in frame or interframe encoding mode is encoded to the macro block of basic tomographic image.
As one embodiment of the present of invention, described scalable video is adapted to two tomographic images or the two-layer Video coding with epigraph.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (4)
1. a restructuring graph acquisition methods, it is characterized in that, enhancement layer image is reduced into to basic tomographic image, select interframe encoding mode to be encoded to described basic tomographic image, obtain basic tomographic image restructuring graph, utilize interpolation filter that basic tomographic image restructuring graph is amplified to the enhancement layer image size, the predicted picture of tomographic image is enhanced, enhancement layer image is deducted to the predicted picture of enhancement layer image, obtain the image level difference, the image level difference of obtaining is encoded, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of tomographic image is enhanced,
Dividing described enhancement layer image is some macro blocks, and dividing basic tomographic image is some macro blocks,
The encode macro block of basic tomographic image, basic layer macro block after coding is amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block is enhanced, enhancement layer macro block is deducted to the predicted macroblock of enhancement layer macro block, obtain the macro-block level difference, and this macro-block level difference is encoded, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.
2. method according to claim 1, is characterized in that, selects in frame or interframe encoding mode is encoded to the macro block of basic tomographic image.
3. a restructuring graph deriving means, is characterized in that, this device comprises:
Image dwindles unit, and enhancement layer image is reduced into to basic tomographic image;
Basic tomographic image reconfiguration unit, select interframe encoding mode to be encoded to described basic tomographic image, obtains basic tomographic image restructuring graph;
The predicted picture acquiring unit, utilize interpolation filter basic tomographic image restructuring graph to be amplified to the enhancement layer image size, the predicted picture of the tomographic image that is enhanced;
Image level differential coding unit, deduct enhancement layer image the predicted picture of enhancement layer image, obtains the image level difference, and the image level difference of obtaining is encoded;
The enhancement layer image reconfiguration unit, by the image level difference addition after the predicted picture of enhancement layer image and coding, the restructuring graph of the tomographic image that is enhanced,
This device also comprises the macroblock partitions unit, for dividing described enhancement layer image, is some macro blocks, and dividing basic tomographic image is some macro blocks,
This device also comprises:
The macroblock coding unit, the macro block of the basic tomographic image of encoding;
The predicted macroblock acquiring unit, be amplified to corresponding enhancement layer macro block size, the predicted macroblock of layer macro block that be enhanced by the basic layer macro block after coding;
Macro-block level differential coding unit, deduct enhancement layer macro block the predicted macroblock of enhancement layer macro block, obtains the macro-block level difference, and this macro-block level difference is encoded;
The macro block reconfiguration unit, by the macro-block level difference addition after the predicted macroblock of enhancement layer macro block and coding, the restructuring graph of layer macro block that be enhanced.
4. device according to claim 3, is characterized in that, selects in frame or interframe encoding mode is encoded to the macro block of basic tomographic image.
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Citations (3)
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|---|---|---|---|---|
| CN1674677A (en) * | 2005-04-21 | 2005-09-28 | 上海大学 | Improved FGS coding method and coder/decoder thereof |
| WO2008071036A1 (en) * | 2006-12-14 | 2008-06-19 | Thomson Licensing | Method and apparatus for encoding and/or decoding bit depth scalable video data using adaptive enhancement layer prediction |
| WO2009000110A1 (en) * | 2007-06-27 | 2008-12-31 | Thomson Licensing | Method and apparatus for encoding and/or decoding video data using enhancement layer residual prediction for bit depth scalability |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674677A (en) * | 2005-04-21 | 2005-09-28 | 上海大学 | Improved FGS coding method and coder/decoder thereof |
| WO2008071036A1 (en) * | 2006-12-14 | 2008-06-19 | Thomson Licensing | Method and apparatus for encoding and/or decoding bit depth scalable video data using adaptive enhancement layer prediction |
| WO2009000110A1 (en) * | 2007-06-27 | 2008-12-31 | Thomson Licensing | Method and apparatus for encoding and/or decoding video data using enhancement layer residual prediction for bit depth scalability |
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Effective date of registration: 20120228 Address after: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Applicant after: Beijing Vimicro Corporation Co-applicant after: Vimicro Electronics Co., Ltd. Address before: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Applicant before: Beijing Vimicro Corporation |
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Effective date of registration: 20171221 Address after: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee after: Vimicro Electronics Co., Ltd. Patentee after: Zhongxing Technology Co., Ltd. Address before: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee before: Vimicro Electronics Co., Ltd. Patentee before: Beijing Vimicro Corporation |
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Address after: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee after: Vimicro Electronics Co., Ltd. Patentee after: Mid Star Technology Limited by Share Ltd Address before: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee before: Vimicro Electronics Co., Ltd. Patentee before: Zhongxing Technology Co., Ltd. |