WO2013086724A1 - Method of clippling transformed coefficients before de-quantization - Google Patents

Method of clippling transformed coefficients before de-quantization Download PDF

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Publication number
WO2013086724A1
WO2013086724A1 PCT/CN2011/084083 CN2011084083W WO2013086724A1 WO 2013086724 A1 WO2013086724 A1 WO 2013086724A1 CN 2011084083 W CN2011084083 W CN 2011084083W WO 2013086724 A1 WO2013086724 A1 WO 2013086724A1
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WO
WIPO (PCT)
Prior art keywords
clipping
quantization
level
bit
depth
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/084083
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French (fr)
Inventor
Xiang Li
Xun Guo
Shaw-Min Lei
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MediaTek Singapore Pte Ltd
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MediaTek Singapore Pte Ltd
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Publication date
Application filed by MediaTek Singapore Pte Ltd filed Critical MediaTek Singapore Pte Ltd
Priority to PCT/CN2011/084083 priority Critical patent/WO2013086724A1/en
Priority to CA2831019A priority patent/CA2831019C/en
Priority to PCT/CN2012/086648 priority patent/WO2013087021A1/en
Priority to RU2013145895/07A priority patent/RU2600935C1/en
Priority to EP12858362.2A priority patent/EP2737696B8/en
Priority to JP2014523196A priority patent/JP5753630B2/en
Priority to CN201710823352.0A priority patent/CN107493475B/en
Priority to US13/985,779 priority patent/US9420296B2/en
Priority to CN201280054630.6A priority patent/CN103959780B/en
Priority to US14/363,791 priority patent/US20140328395A1/en
Priority to AU2012350503A priority patent/AU2012350503B2/en
Priority to CN201280060536.1A priority patent/CN103975592B/en
Priority to EP12857216.1A priority patent/EP2737706A4/en
Priority to MX2013012041A priority patent/MX2013012041A/en
Priority to PCT/CN2012/086658 priority patent/WO2013087025A1/en
Publication of WO2013086724A1 publication Critical patent/WO2013086724A1/en
Anticipated expiration legal-status Critical
Priority to US15/079,341 priority patent/US9565441B2/en
Priority to US15/375,574 priority patent/US9749635B2/en
Ceased legal-status Critical Current

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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
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3059—Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression
    • 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
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • 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
    • H04N19/18—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 a set of transform coefficients
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • 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
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • 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
    • H04N19/184—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 bits, e.g. of the compressed video stream
    • 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
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder

Definitions

  • the present invention relates generally to video and image compression, and more particularly, to a method and an associated apparatus for clipping transformed coefficients before de-quantization in high efficiency video coding (HEVC).
  • HEVC high efficiency video coding
  • HEVC is an emerging video coding standard being developed by ITU-T and MPEG.
  • de-quantization process is formulated as following function (1):
  • An exemplary embodiment of a method of clipping transformed coefficient before de-quantization in video and image compression comprising: setting clipping condition based on a transform size, a source bit-depth, and/or a quantization parameter; and adaptively clipping transformed coefficient according to the clipping condition.
  • the adaptive clipping may be further simplified to one- parameter-dependent clipping, or even to unconditional fixed-range clipping.
  • FIG. 1 is a diagram illustrating the proposed adaptive clipping in a general case.
  • FIG. 2 is a diagram illustrating the proposed adaptive clipping simplified for 8- bit videos.
  • FIG. 3 is a diagram illustrating the proposed adaptive clipping simplified for 10- bit or higher bit-depth videos.
  • source bit-depth is assumed as 8 bits.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

A method of clipping transformed coefficient before de-quantization in video and image compression and an associated apparatus are provided. The method comprises: setting clipping condition based on a transform size, a source bit-depth, and/or a quantization parameter; and adaptively clipping transformed coefficient according to the clipping condition. In some embodiments, the adaptive clipping may be further simplified to one-parameter-dependent clipping, or even to unconditional fixed-range clipping. With the provided method and associated apparatus, undesired overflow in 32-bit de-quantization process is completely avoided.

Description

METHOD OF CLIPPLING TRANSFORMED
COEFFICIENTS BEFORE DE-QUANTIZATION
TECHNICAL FIELD
The present invention relates generally to video and image compression, and more particularly, to a method and an associated apparatus for clipping transformed coefficients before de-quantization in high efficiency video coding (HEVC).
BACKGROUND
HEVC is an emerging video coding standard being developed by ITU-T and MPEG. In current HEVC (working draft 5 and test model 5), de-quantization process is formulated as following function (1):
coeffQ=((level*IQ[QP 6]«(QP/6)) + offset)»(M-l+DB), offset =1«(M- 2+DB) (1)
wherein "coeffQ" and "level" denote de-quantized and quantized transformed coefficients, respectively, IQ(x)=g(x)={40,45,51, 57,64,72}, x=0,...,5 indicates de- quantization step, QP represents quantization parameter, M=log2(N), N stands for transform size, DB=B-8, B is bit-depth of input video. Note that term "QP/6" indicates the integer part of QP/6 hereafter.
It is assumed that the dynamic range of level is 16 bits (including 1 bit for sign). Since IQ(x) <= 72, QP <= 51, the dynamic range of IQ(x) is 7 bits and "« (QP/6)" needs 8 bits at most. Consequently, the dynamic range of "(level*IQ[QP 6]) « (QP/6)" is 16+7+8=31 bits. Therefore, the aforementioned function (1) will never cause overflow in 32-bit de-quantization.
However, when quantization matrix is introduced, the de-quantization is modified from functions (1) to functions (2)-(4), i.e.,
iShift = M-l+DB+4; (2) if (iShift > QP/6)
coeffQ[i] j]=(level[i]|j]*W[i]|j]*IQ[QP 6]+offset)»(iShift-QP/6), offset= l«(iShift-QP/6-l), with i=0...nW-l, j=0..nH-l (3) else
coeffQ[i] j]=(level[i]|j]*W[i]|j]*IQ[QP 6])«(QP/6-iShift) (4)
wherein "[i][j]" indicates the position of transformed coefficient in a transform unit, W denotes quantization matrix, nW and nH are width and height of the transform.
Considering that W is an 8-bit array, the dynamic range of (4) is 16+8+7+3=34 bits when QP=51, M=2 and DB=0. In 32-bit de-quantization, function (4) may cause overflow, which is not desired in practice since it may cause coding failure especially in decoder.
SUMMARY
It is therefore an objective of the claimed invention to provide a method of clipping transformed coefficient before de-quantization, and to provide an associated apparatus, in order to solve the aforementioned problems.
An exemplary embodiment of a method of clipping transformed coefficient before de-quantization in video and image compression comprising: setting clipping condition based on a transform size, a source bit-depth, and/or a quantization parameter; and adaptively clipping transformed coefficient according to the clipping condition.
In some embodiments, the adaptive clipping may be further simplified to one- parameter-dependent clipping, or even to unconditional fixed-range clipping.
The details of one or more embodiments of the present invention are set forth in the accompanying drawings and the description below. Other features, objectives, and advantages of the present invention will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings, where like numerals indicate like components, illustrate embodiments of the invention.
FIG. 1 is a diagram illustrating the proposed adaptive clipping in a general case. FIG. 2 is a diagram illustrating the proposed adaptive clipping simplified for 8- bit videos. FIG. 3 is a diagram illustrating the proposed adaptive clipping simplified for 10- bit or higher bit-depth videos.
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.
Let x be the dynamic range of transformed coefficient "level". To avoid overflow in aforementioned function (4), x has to submit to following condition:
x+8+7+(QP/6-(M-l+DB+4)) <= 32, (5) which leads to
x <= 20+M+DB-QP/6 (6) Consequently, level shall be clipped as in following function (7)
level = max(-2x l, min(2x l-l, level)) (7)
In the first embodiment, the function (6) is applied as follows:
if (x = 20+M+DB-QP/6 >= 16)
level = max(-215, min(215-l, level))
else
level = max(-2x l, min(2x l-l, level))
In the second embodiment, source bit-depth is assumed as 8 bits. In this case, DB=0 and function (6) can be simplified to
x <= 22-QP/6
Consequently, the proposed clipping is only dependent on QP, i.e.,
if (QP <= 42)
level = max(-215, min(215-l, level))
else
level = max(-221-QP/6, min(221-QP/6-l, level))
In the third embodiment, source bit-depth is assumed as 10 bits or higher, namely DB >= 2. Considering that M >= 2 and QP <= 51, the condition in function (6) is always met. In this case, 16-bit clipping, namely level = (-215, min(215-l, level)), is always used. Those skilled in the art will readily observe that numerous modifications and alterations of the apparatus and method may be made while retaining the teachings of the present invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims

1. A method of clipping transformed coefficient before de-quantization in video and image compression, comprising:
setting clipping condition based on a transform size, a source bit-depth, and/or a quantization parameter; and
adaptively clipping transformed coefficient according to the clipping condition.
2. The method of claim 1, wherein the clipping is applied to the transformed coefficient before de-quantization.
3. The method of claim 1, wherein the clipping condition is set only based on the quantization parameter when the source bit-depth is 8 bits.
4. The method of claim 1, wherein the adaptive clipping is simplified to an unconditional fixed-range clipping when the source bit-depth is 10 bits or higher.
PCT/CN2011/084083 2011-12-15 2011-12-15 Method of clippling transformed coefficients before de-quantization Ceased WO2013086724A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
PCT/CN2011/084083 WO2013086724A1 (en) 2011-12-15 2011-12-15 Method of clippling transformed coefficients before de-quantization
US14/363,791 US20140328395A1 (en) 2011-12-15 2012-12-14 Method and apparatus for dequantization of transformed coefficients
AU2012350503A AU2012350503B2 (en) 2011-12-15 2012-12-14 Method and apparatus for dequantization of transformed coefficients
RU2013145895/07A RU2600935C1 (en) 2011-12-15 2012-12-14 Method and device for limiting quantization level
EP12858362.2A EP2737696B8 (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping
JP2014523196A JP5753630B2 (en) 2011-12-15 2012-12-14 Method and apparatus for inverse quantization of transformed coefficients
CN201710823352.0A CN107493475B (en) 2011-12-15 2012-12-14 Quantization level interception device and method
US13/985,779 US9420296B2 (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping
CN201280054630.6A CN103959780B (en) 2011-12-15 2012-12-14 Quantization level clipping device and method
CA2831019A CA2831019C (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping
PCT/CN2012/086648 WO2013087021A1 (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping
CN201280060536.1A CN103975592B (en) 2011-12-15 2012-12-14 Method and apparatus for inverse quantization of transform coefficients
EP12857216.1A EP2737706A4 (en) 2011-12-15 2012-12-14 Method and apparatus for dequantization of transformed coefficients
MX2013012041A MX2013012041A (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping.
PCT/CN2012/086658 WO2013087025A1 (en) 2011-12-15 2012-12-14 Method and apparatus for dequantization of transformed coefficients
US15/079,341 US9565441B2 (en) 2011-12-15 2016-03-24 Method and apparatus for quantization level clipping
US15/375,574 US9749635B2 (en) 2011-12-15 2016-12-12 Method and apparatus for quantization level clipping

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PCT/CN2012/086648 Continuation-In-Part WO2013087021A1 (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping
US13/985,779 Continuation-In-Part US9420296B2 (en) 2011-12-15 2012-12-14 Method and apparatus for quantization level clipping

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PCT/CN2012/086658 Ceased WO2013087025A1 (en) 2011-12-15 2012-12-14 Method and apparatus for dequantization of transformed coefficients

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US20160205401A1 (en) 2016-07-14
JP5753630B2 (en) 2015-07-22
CA2831019A1 (en) 2013-06-20
US9565441B2 (en) 2017-02-07
EP2737696A1 (en) 2014-06-04
CA2831019C (en) 2017-12-05
US20140328395A1 (en) 2014-11-06
US20170094275A1 (en) 2017-03-30
WO2013087025A1 (en) 2013-06-20
AU2012350503B2 (en) 2015-11-05
EP2737706A1 (en) 2014-06-04
AU2012350503A1 (en) 2014-02-06
US9749635B2 (en) 2017-08-29
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