WO2001035673A1 - Variance based adaptive block size dct image compression - Google Patents

Variance based adaptive block size dct image compression Download PDF

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Publication number
WO2001035673A1
WO2001035673A1 PCT/US2000/030883 US0030883W WO0135673A1 WO 2001035673 A1 WO2001035673 A1 WO 2001035673A1 US 0030883 W US0030883 W US 0030883W WO 0135673 A1 WO0135673 A1 WO 0135673A1
Authority
WO
WIPO (PCT)
Prior art keywords
block
threshold
data
subdivided
variance
Prior art date
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/US2000/030883
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English (en)
French (fr)
Inventor
Kadayam Thyagarajan
Michael J. Merritt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to HK03105794.4A priority Critical patent/HK1053565B/xx
Priority to JP2001537288A priority patent/JP5289659B2/ja
Priority to KR1020027005962A priority patent/KR100740818B1/ko
Priority to IL14945500A priority patent/IL149455A0/xx
Priority to BRPI0015341-9A priority patent/BR0015341B1/pt
Priority to CA2389410A priority patent/CA2389410C/en
Priority to AU14811/01A priority patent/AU782176B2/en
Priority to ES00977131T priority patent/ES2376540T3/es
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to MXPA02004577A priority patent/MXPA02004577A/es
Priority to AT00977131T priority patent/ATE538598T1/de
Priority to EP00977131A priority patent/EP1230804B1/en
Publication of WO2001035673A1 publication Critical patent/WO2001035673A1/en
Priority to IL149455A priority patent/IL149455A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04N19/90—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
    • H04N19/96—Tree coding, e.g. quad-tree 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
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
    • 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

Definitions

  • the present invention relates to image processing. More specifically, the present invention relates to a compression scheme for image signals utilizing adaptively sized blocks and sub-blocks of encoded discrete cosine transform coefficient data.
  • the blocking effect is perhaps the most important impairment to image quality. Furthermore, the blocking effect tends to be more perceptible in busy areas of the image. However, it has been realized that the blocking effect is reduced when a smaller sized DCT is used. The blocking effect becomes virtually invisible when a 2x2 DCT is used, although the bit per pixel performance may suffer. Thus, contrast adaptive coding may reduce the blocking effect by assigning smaller block sizes (and thereby more bits) to the busy areas and larger block sizes to the relatively blank areas.
  • Another feature of the present invention is that it utilizes intraframe coding (spatial processing) instead of interframe coding (spatio-temporal processing).
  • intraframe coding spatial processing
  • interframe coding spatial-temporal processing
  • each of the Y, Cb, and Cr components is processed without sub-sampling.
  • an input of a 16x16 block of pixels is provided to the encoder 102.
  • the encoder 102 comprises a block size assignment element 108, which performs block size assignment in preparation for video compression.
  • the block size assignment element 108 determines the block decomposition of the 16x16 block based on the perceptual characteristics of the image in the block.
  • Block size assignment subdivides each 16x16 block into smaller blocks in a quad-tree fashion depending on the activity within a 16x16 block.
  • the block size assignment element 108 generates a quad-tree data, called the PQR data, whose length can be between 1 and 21 bits.
  • the variance, v8. is computed, at step 214.
  • the variance threshold T8 is modified to provide a new threshold T'8 if the mean value of the block is between two predetermined values, then the block variance is compared to this new threshold. If the variance v8_ is not greater than the threshold T8, then at step 218, the starting address of the 8x8 block is written, and the corresponding Q bit, Q_, is set to 0. The next 8x8 block is then processed. If the variance v8.
  • the color components may be decimated horizontally, vertically, or both.
  • the composite block is provided to an inverse quantizer 124, for undoing the processing due to the use of the frequency weighting masks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
PCT/US2000/030883 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression Ceased WO2001035673A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
AU14811/01A AU782176B2 (en) 1999-11-08 2000-11-08 Variance based adaptive block size DCT image compression
KR1020027005962A KR100740818B1 (ko) 1999-11-08 2000-11-08 분산 기반의 적응형 블록 사이즈 ｄｃｔ 이미지 압축
IL14945500A IL149455A0 (en) 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression
BRPI0015341-9A BR0015341B1 (pt) 1999-11-08 2000-11-08 “método para determinar uma designação de tamanho de bloco para um bloco de entrada de pixels de imagem a ser usada na compressão do bloco de entrada, sistema de compressão de imagens para comprimir um bloco de dados de pixels, método e sistema para compressão de um bloco de dados de pixels de uma imagem, bem como, meio legível por computador”.
CA2389410A CA2389410C (en) 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression
ES00977131T ES2376540T3 (es) 1999-11-08 2000-11-08 Compresión de imagen por dct de tamaño de bloque adaptativo en base a la varianza.
MXPA02004577A MXPA02004577A (es) 1999-11-08 2000-11-08 Compresion de imagenes de dct de tamano de bloque adaptable basada en variacion.
HK03105794.4A HK1053565B (en) 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression
JP2001537288A JP5289659B2 (ja) 1999-11-08 2000-11-08 分散に基づいた適応性ブロックサイズｄｃｔ画像圧縮
AT00977131T ATE538598T1 (de) 1999-11-08 2000-11-08 Varianzbasierte adaptive blockgrösse dct bildkomprimierung
EP00977131A EP1230804B1 (en) 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression
IL149455A IL149455A (en) 1999-11-08 2002-05-02 DCT image compression to unit size Different adaptability based

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/436,085 US6529634B1 (en) 1999-11-08 1999-11-08 Contrast sensitive variance based adaptive block size DCT image compression
US09/436,085 1999-11-08

Publications (1)

Publication Number Publication Date
WO2001035673A1 true WO2001035673A1 (en) 2001-05-17

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PCT/US2000/030883 Ceased WO2001035673A1 (en) 1999-11-08 2000-11-08 Variance based adaptive block size dct image compression

Country Status (17)

Country Link
US (1) US6529634B1 (https=)
EP (1) EP1230804B1 (https=)
JP (2) JP5289659B2 (https=)
KR (1) KR100740818B1 (https=)
CN (1) CN1186942C (https=)
AR (1) AR033655A1 (https=)
AT (1) ATE538598T1 (https=)
AU (1) AU782176B2 (https=)
BR (1) BR0015341B1 (https=)
CA (1) CA2389410C (https=)
ES (1) ES2376540T3 (https=)
IL (2) IL149455A0 (https=)
MX (1) MXPA02004577A (https=)
RU (1) RU2273112C2 (https=)
TW (1) TW517500B (https=)
WO (1) WO2001035673A1 (https=)
ZA (1) ZA200203276B (https=)

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