CA2576161A1 - Method for reduced bit-depth quantization - Google Patents

Method for reduced bit-depth quantization Download PDF

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Publication number
CA2576161A1
CA2576161A1 CA002576161A CA2576161A CA2576161A1 CA 2576161 A1 CA2576161 A1 CA 2576161A1 CA 002576161 A CA002576161 A CA 002576161A CA 2576161 A CA2576161 A CA 2576161A CA 2576161 A1 CA2576161 A1 CA 2576161A1
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transform coefficient
sample
video decoder
derives
means derives
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CA002576161A
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French (fr)
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CA2576161C (en
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Louis Joseph Kerofsky
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Dolby International AB
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Priority to CA2737889A priority Critical patent/CA2737889C/en
Priority to CA2737864A priority patent/CA2737864C/en
Priority to CA2737888A priority patent/CA2737888C/en
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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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • 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
    • H03M7/14—Conversion to or from non-weighted codes
    • H03M7/24—Conversion to or from floating-point codes
    • 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
    • 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
    • H04N19/169—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
    • 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
    • H04N19/10—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
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation

Abstract

A method is provided for the quantization of a coefficient. The method comprises: supplying a coefficient K; supplying a quantization parameter (QP); forming a quantization value (L) from the coefficient K using a mantissa portion (Am(QP)) and an exponential portion (x Ac(QP) ). Typically, the value of x is 2. In some aspects of the method, forming a quantization value (L) from the coefficient K included L = K* A(QP) = K* Am(QP)*(2 Ac(QP) ). In other aspects, the method further comprises: normalizing the quantization value by 2 N as follows: Ln = L/2 N = K*Am(QP)/2 (N-Ac(QP) ). In some aspects, forming a quantization value includes forming a set of recursive quantization factors with a period P, where A(QP+P)=A(QP)/x. Forming recursive quantization factors includes forming recursive mantissa factors, where Am(QP)=Am(QP mod P), and forming recursive exponential factors, where Ae(QP) = Ae(QP mod P) - QP/P.

Claims (6)

1. A video decoder for reconstruction of a sample from a quantized level, including:
a first means for deriving a transform coefficient;
a second means for performing inverse transformation; and a third means for performing normalization, wherein:
said first means derives said transform coefficient by using a mantissa portion and an exponential portion, said second means derives a scaled sample by inverse transforming said transform coefficient, and said third means derives a reconstructed sample by normalizing said scaled sample using a constant normalization factor.
2. A video decoder for reconstruction of a sample from a quantized level, including:
a first means for deriving a transform coefficient; and a second means for performing inverse transformation, wherein:
said first means derives said transform coefficient by using a mantissa portion and an exponential portion, said second means derives a scaled sample by inverse transforming said transform coefficient, and said mantissa portion is a matrix with a raw represented by a quantization parameter and a column represented by a value related to the basis of said transformation.
3. A video decoder of claim 2, wherein:
said value is a first integer for both horizontal basis and vertical basis are even number, a second integer for both horizontal basis and vertical basis are odd number, and a third integer for otherwise.
4. A video decoder for reconstruction of a sample from a quantized level L, including:
a first means for deriving a transform coefficient K;
a second means for performing inverse transformation; and a third means for performing normalization, wherein:
said first means derives said transform coefficient, by using a mantissa portion Bm(QP) being a function of a quantization parameter QP
and an exponential portion Be(QP) being a function of said quantization parameter, as K = [L * Bm(QP)] <<Be(QP), where "<<" expresses a left-shift operation, the functions Bm(QP) and Be(QP) satisfy, Bm(QP) = Bm(QP mode P), and Be(QP) = B(0) + QP/P, where P in an integer, said second means derives a scaled sample by inverse transforming said transform coefficient, and said third means derives a reconstructed sample by normalizing said scaled sample using a constant normalization factor.
5. A video decoder for reconstruction of a sample from a quantized level L, including:
a first means for deriving a transform coefficient K; and a second means for performing inverse transformation, wherein:
said first means derives said transform coefficient by using a mantissa portion and an exponential portion, said second means derives a scaled sample by inverse transforming said transform coefficient, and said mantissa portion is a matrix with a matrix element B(QP)[i][j] being a function of a quantization parameter QP, where i and j are horizontal basis or vertical basis of said transform coefficient.
6. A video decoder of claim 5, wherein:
said matrix element is represented as B(QP)[i][j] = S QP, 0, when i and j are both even integers, B(QP)[i][j] = S QP, 1, when i and j are both odd integers, B(QP)[i][j] = S QP, 2, when otherwise.
CA2576161A 2001-08-09 2002-08-08 Method for reduced bit-depth quantization Expired - Lifetime CA2576161C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2737889A CA2737889C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737864A CA2737864C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737888A CA2737888C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US31143601P 2001-08-09 2001-08-09
US60/311,436 2001-08-09
US31901801P 2001-11-30 2001-11-30
US60/319,018 2001-11-30
US10/139,036 US7123655B2 (en) 2001-08-09 2002-05-02 Method for reduced bit-depth quantization
US10/139,036 2002-05-02
CA002454626A CA2454626C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization

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CA2737888A Division CA2737888C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737864A Division CA2737864C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737889A Division CA2737889C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization

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CA2576161A1 true CA2576161A1 (en) 2003-02-27
CA2576161C CA2576161C (en) 2011-07-19

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CA002454626A Expired - Lifetime CA2454626C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2776992A Expired - Lifetime CA2776992C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737864A Expired - Lifetime CA2737864C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737889A Expired - Lifetime CA2737889C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2946246A Expired - Lifetime CA2946246C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data
CA2801972A Expired - Lifetime CA2801972C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2946257A Expired - Lifetime CA2946257C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data
CA2737888A Expired - Lifetime CA2737888C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2886119A Expired - Lifetime CA2886119C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data
CA2576161A Expired - Lifetime CA2576161C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2841701A Expired - Lifetime CA2841701C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2996825A Expired - Lifetime CA2996825C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data

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CA002454626A Expired - Lifetime CA2454626C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2776992A Expired - Lifetime CA2776992C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737864A Expired - Lifetime CA2737864C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2737889A Expired - Lifetime CA2737889C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2946246A Expired - Lifetime CA2946246C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data
CA2801972A Expired - Lifetime CA2801972C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2946257A Expired - Lifetime CA2946257C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data
CA2737888A Expired - Lifetime CA2737888C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2886119A Expired - Lifetime CA2886119C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data

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CA2841701A Expired - Lifetime CA2841701C (en) 2001-08-09 2002-08-08 Method for reduced bit-depth quantization
CA2996825A Expired - Lifetime CA2996825C (en) 2001-08-09 2002-08-08 An image decoding apparatus for obtaining a decoded image by decoding an encoded data

Country Status (14)

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US (15) US7123655B2 (en)
EP (6) EP1459449B1 (en)
JP (16) JP3678365B2 (en)
KR (3) KR100591653B1 (en)
CN (5) CN101399988B (en)
AT (2) ATE434288T1 (en)
CA (12) CA2454626C (en)
CY (2) CY1120069T1 (en)
DE (1) DE60232681D1 (en)
DK (5) DK2262113T3 (en)
ES (6) ES2380936T3 (en)
HK (5) HK1108786A1 (en)
PT (5) PT2262113T (en)
WO (1) WO2003017497A1 (en)

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