CA2622842C - Methode et systeme de decodage d'images codees et de reduction de la taille desdites images - Google Patents

Methode et systeme de decodage d'images codees et de reduction de la taille desdites images Download PDF

Info

Publication number
CA2622842C
CA2622842C CA 2622842 CA2622842A CA2622842C CA 2622842 C CA2622842 C CA 2622842C CA 2622842 CA2622842 CA 2622842 CA 2622842 A CA2622842 A CA 2622842A CA 2622842 C CA2622842 C CA 2622842C
Authority
CA
Canada
Prior art keywords
image
size
quantized
dct
domain
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.)
Active
Application number
CA 2622842
Other languages
English (en)
Other versions
CA2622842A1 (fr
Inventor
Guixing Wu
Brian Lamb
En-Hui Yang
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.)
BlackBerry Ltd
Original Assignee
BlackBerry Ltd
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
Application filed by BlackBerry Ltd filed Critical BlackBerry Ltd
Priority to CA 2622842 priority Critical patent/CA2622842C/fr
Publication of CA2622842A1 publication Critical patent/CA2622842A1/fr
Application granted granted Critical
Publication of CA2622842C publication Critical patent/CA2622842C/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
    • 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
    • H04N19/10—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
    • H04N19/134—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
    • H04N19/156—Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
    • 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
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • 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
    • H04N19/48—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Méthode et système permettant de diminuer le nombre d'opérations mathématiques requises dans le cadre du processus de décodage JPEG sans influencer considérablement la qualité de l'image affichée. Des modes de réalisation fournissent un processus de décodage JPEG efficace pour afficher une image plus petite que l'image originale, par exemple, sur l'écran d'un appareil portatif. Conformément à un aspect de la présente invention, cela est accompli par la diminution du traitement requis pour la déquantification et transformation discrète en cosinus inversée en réduisant efficacement la taille de l'image dans le domaine quantifié et transformé discrètement en cosinus avant la déquantification et la transformation discrète en cosinus inversée. Cela peut être réalisé, par exemple, en écartant les rangées et les colonnes d'indice de transformation discrète en cosinus factultatives avant la déquantification et la transformation discrète en cosinus inversée. Dans un mode de réalisation, les colonnes de la droite et les rangées du bas sont écartées de manière à ce que seules les parties supérieures gauches du bloc de coefficients quantifiés et transformés discrètement en cosinus soient traitées.
CA 2622842 2008-02-28 2008-02-28 Methode et systeme de decodage d'images codees et de reduction de la taille desdites images Active CA2622842C (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2622842 CA2622842C (fr) 2008-02-28 2008-02-28 Methode et systeme de decodage d'images codees et de reduction de la taille desdites images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2622842 CA2622842C (fr) 2008-02-28 2008-02-28 Methode et systeme de decodage d'images codees et de reduction de la taille desdites images

Publications (2)

Publication Number Publication Date
CA2622842A1 CA2622842A1 (fr) 2009-08-28
CA2622842C true CA2622842C (fr) 2013-10-29

Family

ID=41010630

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2622842 Active CA2622842C (fr) 2008-02-28 2008-02-28 Methode et systeme de decodage d'images codees et de reduction de la taille desdites images

Country Status (1)

Country Link
CA (1) CA2622842C (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8045810B2 (en) 2008-02-28 2011-10-25 Research In Motion Limited Method and system for decoding encoded images and reducing the size of said images
US10186052B1 (en) * 2018-01-19 2019-01-22 Google Llc Two-pass decoding of images
CA3094608A1 (fr) * 2018-03-28 2019-10-03 Sony Corporation Dispositif de traitement d'image et procede de traitement d'image

Also Published As

Publication number Publication date
CA2622842A1 (fr) 2009-08-28

Similar Documents

Publication Publication Date Title
US8737752B2 (en) Method and system for decoding encoded images and reducing the size of said images
JP4994655B2 (ja) 効率的な損失なしデータ圧縮のための可逆重ね合わせ演算子
EP1672517B1 (fr) Transformation invertible pour compression de données 2D avec ou sans pertes
CA2653693A1 (fr) Diminution des erreurs pendant le calcul d'une transformee de cosinus discret inverse
US8478059B2 (en) Arbitrary ratio image resizing in the DCT domain
US12489922B2 (en) Image processing method and apparatus, electronic device, and storage medium
CA2622842C (fr) Methode et systeme de decodage d'images codees et de reduction de la taille desdites images
EP2051526B1 (fr) Redimensionnement d'images avec un rapport arbitraire dans le domaine DCT
US7216140B1 (en) Efficient implementation of n-point DCT, n-point IDCT, SA-DCT and SA-IDCT algorithms
CN111083479A (zh) 一种视频帧预测方法、装置及终端设备
US6738534B2 (en) Apparatus, and associated method, for altering the resolution of a digital image
CN101237573A (zh) 影像资料压缩运算方法
Watson et al. Vidpak: high speed lossless scientific video compression
Martisius et al. A 2-D DCT hardware codec based on Loeffler algorithm
EP2645712A1 (fr) Sous échantillonnage d'images
Jayanthi et al. High performance VLSI architecture for block based visible image watermarking
Anas et al. FPGA implementation of a pipelined 2D-DCT and simplified quantization for real-time applications
US8244071B2 (en) Non-dyadic spatial scalable wavelet transform
JP3818484B2 (ja) 符号化動画像データの復号装置および記録媒体
JP3385866B2 (ja) 逆量子化・逆ｄｃｔ回路
US9349196B2 (en) Merging and splitting data blocks
CN119011737A (zh) 图像压缩方法、装置、计算机设备和存储介质
BR102020016689A2 (pt) Sistema de aproximação da transformada discreta do cosseno de comprimento 16 para alta compressão de imagens com 66 adições
Wang et al. On-chip frame memory reduction using a high-compression-ratio codec in the overdrives of liquid-crystal displays
Melo et al. Byte Structure Variable Length Coding (BS-VLC): A new specific algorithm applied in the compression of trajectories generated by molecular dynamics

Legal Events

Date Code Title Description
EEER Examination request
W00 Other event occurred

Free format text: ST27 STATUS EVENT CODE: A-4-4-W10-W00-W100 (AS PROVIDED BY THE NATIONAL OFFICE); EVENT TEXT: LETTER SENT

Effective date: 20251022

H13 Ip right lapsed

Free format text: ST27 STATUS EVENT CODE: N-4-6-H10-H13-H100 (AS PROVIDED BY THE NATIONAL OFFICE); EVENT TEXT: MAINTENANCE FEE AND LATE FEE NOT PAID BY DEADLINE OF NOTICE

Effective date: 20260202

W00 Other event occurred

Free format text: ST27 STATUS EVENT CODE: N-6-6-W10-W00-W100 (AS PROVIDED BY THE NATIONAL OFFICE); EVENT TEXT: LETTER SENT

Effective date: 20260204

W00 Other event occurred

Free format text: ST27 STATUS EVENT CODE: N-6-6-W10-W00-W100 (AS PROVIDED BY THE NATIONAL OFFICE); EVENT TEXT: LETTER SENT

Effective date: 20260413