WO2015096157A1 - Patterns of major color index map in palette coding - Google Patents
Patterns of major color index map in palette coding Download PDFInfo
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- WO2015096157A1 WO2015096157A1 PCT/CN2013/090761 CN2013090761W WO2015096157A1 WO 2015096157 A1 WO2015096157 A1 WO 2015096157A1 CN 2013090761 W CN2013090761 W CN 2013090761W WO 2015096157 A1 WO2015096157 A1 WO 2015096157A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/129—Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/46—Embedding additional information in the video signal during the compression process
- H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/93—Run-length coding
Definitions
- the invention relates generally to screen content video processing.
- the present invention relates to methods for the major color -based coding (palette coding) method in HEVC range extensions (RExt) or screen content video codec.
- HEVC High Efficiency Video Coding
- palette coding (a.k.a. major color based coding) techniques represent block of pixels using indices to the palette (major colors), and encode the palette and the indices by exploiting spatial redundancy.
- palette is utilized to represent a given video block (e.g. CU).
- palette of each component are constructed and transmitted. All pixels within the given block are then coded using their palette indices.
- each element in the palette is a triplet, representing a specific combination of the three color components.
- the palette index. is shared by all the color components to reduce overhead.
- palette_run e.g., M
- palette_run e.g., M
- a value “copy run” (e.g., N) is transmitted to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the row above.
- palette coding Another major color-base coding (palette coding) method was proposed by Microsoft. Similar to [1], palette of each component are constructed and transmitted. However, the method of coding the palette index is different from the one proposed by Qualcomm. The following describes the procedure to code the palette indices in Microsoft's method.
- pixels in a line are predicted individually. For each pixel, the left or above neighbours is used as predictor, and the prediction symbol is transmitted to the decoder.
- Fig. 1 is a diagram illustrating horizontal scanning order to code the palette index
- Fig. 2 is a diagram illustrating vertical scanning order to code the palette index
- Fig. 3 is a diagram illustrating diagonal scanning order to code the palette index
- Fig. 4 is a diagram illustrating inverse diagonal scanning order to code the palette index
- Fig. 5 is a diagram illustrating the invented prediction mode of L shape. DETAILED DESCRIPTION
- palette index coding mode (prediction mode) to improve the performance. Note that, when the neighboring palette index value which is used to predict current palette index is not available, a default value (e.g. zero) or a derived value based on the pixel value of the neighboring reconstructed pixels are used,
- a value “copy_run” (e.g., N) is transmitted or derived to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the column left.
- N could be 1.
- the N could be the number of the remaining palette index which are not coded yet within the same line.
- a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the palette index of the one that is at the transmitted or derived location,
- a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
- the signaling method can be adaptively determined.
- the adaptive signalling method can be use different VLC code to signal mode according to the position of the current pixel.
- Another adaptive signalling method can be turn off some modes according to the position of the current pixel.
- the palette index of each pixel is scanned column by column vertically from top pixel to bottom pixel within one column. Besides, the scanning is started from the left most column to the right most column.
- palette coding using vertical scanning order the "run” mode in Qualcomm's method can still be used and the "copy top” mode is modified as “copy left” mode accordingly.
- the "normal” mode in Microsoft's method can still be the same and the "horizontal” and “vertical” are modified as “ copy left column” and “column filling” modes, respectively.
- any invented scanning order along with the associated coding method could be used. If multiple scanning orders could be used for coding the palette index, additional syntax could be signaled to indicate which one is used for coding the palette index among the different scanning orders (horizontal scanning, vertical scanning, zig-zag scanning, Hilbert scanning and so on) and the associated coding method.
- the selection of scanning order and the associated coding methods could also be implicitly derived at encoder and decoder sides through an identical derivation process without signaling any additional syntax. Note that, both explicit singaling and implicit deriving of the used scanning order could be done in PU level, CU level, slice level, picture level or sequence level.
Abstract
Methods of major color coding (palette coding) are disclosed. Several scanning patterns other than horizontal one could be used for coding the palette index (major color index). Additional coding method to predict the palette index are also disclosed to improve the coding efficiency of palette coding.
Description
PATTERNS OF MAJOR COLOR INDEX MAP IN PALETTE CODING
FIELD OF INVENTION
The invention relates generally to screen content video processing. In particular, the present invention relates to methods for the major color -based coding (palette coding) method in HEVC range extensions (RExt) or screen content video codec.
BACKGROUND OF THE INVENTION
The first version of High Efficiency Video Coding (HEVC) standard was finalized in January, 2013, which can achieve 40%~50% bitrate savings as compared to H.264/AVC for high-resolution applications. Currently, extensions of HEVC are being developed, including range extensions (RExt) which target on non-4 :2:0 color formats, such as 4:2:2 and 4:4:4, and higher bit-depths video such as 12, 14 and 16 bit-per-sample.
One of the mostly likely applications utilizing RExt is screen sharing, over wired- connection or wireless. Due to specific characteristics of screen-content, coding tools have been developed that demonstrated significant gains in coding efficiency. Among them, the palette coding (a.k.a. major color based coding) techniques represent block of pixels using indices to the palette (major colors), and encode the palette and the indices by exploiting spatial redundancy.
Palette coding [1] [2] [3]
In this first method, proposed by Qualcomm, palette is utilized to represent a given video block (e.g. CU). In the original version of the work [1], palette of each component are constructed and transmitted. All pixels within the given block are then coded using their palette indices.
Later on Qualcomm proposed a second version of their palette coding technique [2], in which each element in the palette is a triplet, representing a specific combination of the three color components. The palette index. is shared by all the color components to reduce overhead.
The following describes the procedure to code the palette indices in qualcomm' s method.
- Scan the CU in horizontal scan order (or so called raster scan order, horizontal direction in each line, from top line to bottom line, see figure 1 for reference)
- Signal palette index using one of the following 2 modes
o Run mode: signal "palette index" followed by "run"
■ In "run mode", a palette index is first signaled followed by "palette_run" (e.g., M). No
further information needs to be transmitted for the current position and the following M positions as they have the same palette index as signaled,
o Copy top mode: Signal a "copy run"
■ In "copy above mode", a value "copy run" (e.g., N) is transmitted to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the row above.
Another major color-base coding (palette coding) method was proposed by Microsoft. Similar to [1], palette of each component are constructed and transmitted. However, the method of coding the palette index is different from the one proposed by Qualcomm. The following describes the procedure to code the palette indices in Microsoft's method.
- Scan the CU in horizontal scan order (or so called raster scan order, horizontal direction in each line, from top line to bottom line, see figure 1 for reference)
- Signal one line of palette index using one of the following 3 modes
o horizontal mode
■ In horizontal mode, all the pixels in the same line have the same value. If the value is the same as the first pixel of the above pixel line, only line mode signalling bits are transmitted. Otherwise, the index value is also transmitted.
o vertical mode
■ In vertical mode, the curren pixel line is the same with the above pixel line. Therefore, only line mode signalling bits are transmitted,
o normal mode
■ In normal mode, pixels in a line are predicted individually. For each pixel, the left or above neighbours is used as predictor, and the prediction symbol is transmitted to the decoder.
In this invention, we invent several methods to improve the major color based coding (palette coding).
SUMMARY OF THE INVENTION
In view of the previously described major color based coding scheme, we propose several methods for major color coding improvement.
Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention can be more fully understood by reading the subsequent detailed description examples with references made to the accompanying drawings, wherein:
Fig. 1 is a diagram illustrating horizontal scanning order to code the palette index;
Fig. 2 is a diagram illustrating vertical scanning order to code the palette index;
Fig. 3 is a diagram illustrating diagonal scanning order to code the palette index;
Fig. 4 is a diagram illustrating inverse diagonal scanning order to code the palette index; Fig. 5 is a diagram illustrating the invented prediction mode of L shape. DETAILED DESCRIPTION
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
Additional Coding Modes (Prediction Modes)
In additional to the "run" mode, "copy top" mode, "horizontal" mode and "vertical" mode, we propose additional palette index coding mode (prediction mode) to improve the performance. Note that, when the neighboring palette index value which is used to predict current palette index is not available, a default value (e.g. zero) or a derived value based on the pixel value of the neighboring reconstructed pixels are used,
"copy left" mode
In "copy left" mode, a value "copy_run" (e.g., N) is transmitted or derived to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the column left. In one example, N could be 1. In another one example of deriving N, the N could be the number of the remaining palette index which are not coded yet within the same line.
"copy left column" mode
In "copy left" mode, all the pixels in the same line have the same value. If the value is the same as the first pixel of the left pixel column, only line mode signalling bits are transmitted, Otherwise, the index value is also transmitted.
"Column filling" mode
In "column filling" mode, all the pixels in the same column (vertical line) have the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only line mode signalling bits are transmitted.
Otherwise, the index value is also transmitted,
"copy irregular shape" mode
In "copy irregular shape" mode, a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the palette index of the one that is at the transmitted or derived location,
"fill irregular shape" mode
In "copy irregular shape" mode, a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
"copy L shape" mode
In "copy L shape" mode, following N positions (including the current one) in the L shape, as figure 5, are the palette index of the one that is at the transmitted or derived location.
"fill L shape" mode
In "copy L shape" mode, following N positions (including the current one) in the L shape, as figure 5, are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
Adaptive prediction mode signaling
To signal the prediction mode, the signaling method can be adaptively determined. The adaptive signalling method can be use different VLC code to signal mode according to the position of the current pixel. Another adaptive signalling method can be turn off some modes according to the position of the current pixel.
Different Scanning Order for Coding Palette Index
In this invention, we propose to use scanning orders different from horizontal scanning order for coding the palette index.
Vertical scanning order:
As shown in figure 2, the palette index of each pixel is scanned column by column vertically from top pixel to bottom pixel within one column. Besides, the scanning is started from the left most column to the right most column.
In one example of palette coding using vertical scanning order, the "run" mode in Qualcomm's method can still be used and the "copy top" mode is modified as "copy left" mode
accordingly. The "normal" mode in Microsoft's method can still be the same and the "horizontal" and "vertical" are modified as " copy left column" and "column filling" modes, respectively.
Other scanning such as Zig-Zag, Hilbert scanning, diagonal scanning (figure 3), inverse diagonal scanning (figure 4) could also be used.
Signaling of Scanning order ( Coding Method)
In this invention, we have proposed several scanning orders for coding the palette index along with different coding methods. If a codec only allows one specific scanning order be used for coding the palette index, any invented scanning order along with the associated coding method could be used. If multiple scanning orders could be used for coding the palette index, additional syntax could be signaled to indicate which one is used for coding the palette index among the different scanning orders (horizontal scanning, vertical scanning, zig-zag scanning, Hilbert scanning and so on) and the associated coding method. The selection of scanning order and the associated coding methods could also be implicitly derived at encoder and decoder sides through an identical derivation process without signaling any additional syntax. Note that, both explicit singaling and implicit deriving of the used scanning order could be done in PU level, CU level, slice level, picture level or sequence level.
REFERENCE
[1] L. Guo, M. Karczewicz, and J. Sole, "RCE3 : Results of Test 3.1 on Palette
Mode for Screen Content Coding", JCTVC-N0247, Vienna, AT, July 2013.
[2] L. Guo, M. Karczewicz, J. Sole, and R. Joshi, "Non-RCE3 : Modified Palette Mode for Screen Content Coding", JCTVC-N0249, Vienna, AT, July 2013.
[3] X. Guo, B. Li, J. Xu, Y. Lu, S. Li, and F. Wu, "AHG8: Major-color-based screen content coding", JCT VC-O0182, Geneva, CH, October 2013.
Claims
1. A method of major color based (palette ) coding method, comprising:
Transmission of the palette;
Scanning the palette indices;
Prediction of palette indices;
Transmission of palette indices.
2. The method as claimed in claim 1, wherein the palette indices within a block are coded using a scanning pattern.
3. The method as claimed in claim 1, wherein the invented prediction modes of palette indices include "copy left", "copy left column", "column filling ", "copy irregular shape", "fill irregular shape" , "fill L shape" , and "fill L shape".
4. The method as claimed in claim 2, wherein the scanning pattern could be vertical, diagonal, zig-zag, Hilbert, or inverse-diagonal scanning patterns.
5. The method as claimed in claim 2, wherein the scanning pattern for each block is explicitly signaled or implicitly derived to indicate which scanning pattern is used among multiple predefined scanning patterns.
6. The method as claimed in claim 5, wherein the signaling or deriving of the scanning pattern for each block could be at TU level, PU level, CU level, LCU level, slice level, picture level, PPS, SPS or VPS.
7. The method as claimed in claim 5, wherein the multiple scanning patterns include "horizontal", "vertical", "Zig-Zag", "Hilbert", "diagonal", "inverse diagonal" scanning patterns.
8. A method of position dependent prediction mode signaling.
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PCT/CN2013/090761 WO2015096157A1 (en) | 2013-12-27 | 2013-12-27 | Patterns of major color index map in palette coding |
PCT/CN2014/094036 WO2015096647A1 (en) | 2013-12-27 | 2014-12-17 | Method and apparatus for major color index map coding |
CN201910487086.8A CN110225345B (en) | 2013-12-27 | 2014-12-17 | Method and apparatus for primary color index map coding |
CN201480070568.9A CN106063270A (en) | 2013-12-27 | 2014-12-17 | Method and apparatus for major color index map coding |
US15/107,915 US10542271B2 (en) | 2013-12-27 | 2014-12-17 | Method and apparatus for major color index map coding |
EP14874725.6A EP3087743A4 (en) | 2013-12-27 | 2014-12-17 | Method and apparatus for major color index map coding |
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Cited By (3)
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US20150186100A1 (en) * | 2014-01-02 | 2015-07-02 | Vid Scale, Inc. | Two-dimensional palette coding for screen content coding |
US9848198B2 (en) | 2014-10-06 | 2017-12-19 | Qualcomm Incorporated | Diagonal copy for palette mode coding |
US11330297B2 (en) | 2014-08-19 | 2022-05-10 | Qualcomm Incorporated | Methods incorporating extensions to copy-above mode for palette mode coding |
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CN102523367A (en) * | 2011-12-29 | 2012-06-27 | 北京创想空间商务通信服务有限公司 | Real-time image compression and reduction method based on plurality of palettes |
CN103209326A (en) * | 2013-03-29 | 2013-07-17 | 惠州学院 | PNG (Portable Network Graphic) image compression method |
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US20080273804A1 (en) * | 2007-05-02 | 2008-11-06 | Motorola, Inc. | Image Transformation |
CN101884219A (en) * | 2007-10-16 | 2010-11-10 | Lg电子株式会社 | Handle the method and apparatus of vision signal |
US20110197117A1 (en) * | 2010-02-09 | 2011-08-11 | Chris Williamson | Systems and methods for processing color information in spreadsheets |
CN102523367A (en) * | 2011-12-29 | 2012-06-27 | 北京创想空间商务通信服务有限公司 | Real-time image compression and reduction method based on plurality of palettes |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20150186100A1 (en) * | 2014-01-02 | 2015-07-02 | Vid Scale, Inc. | Two-dimensional palette coding for screen content coding |
US10055189B2 (en) * | 2014-01-02 | 2018-08-21 | Vid Scale, Inc. | Two-dimensional palette coding for screen content coding |
US11036459B2 (en) | 2014-01-02 | 2021-06-15 | Vid Scale, Inc. | Two-dimensional palette coding for screen content coding |
US11330297B2 (en) | 2014-08-19 | 2022-05-10 | Qualcomm Incorporated | Methods incorporating extensions to copy-above mode for palette mode coding |
US9848198B2 (en) | 2014-10-06 | 2017-12-19 | Qualcomm Incorporated | Diagonal copy for palette mode coding |
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