Image coding method, encoder, decoding method and decoder and computer program product

A method for encoding an image having color components of each image pixel represented by a value of a high dynamic range (HDR), the method comprising: decomposing the image into image blocks; determining a scaling factor for each image block, said scaling factor, when applied to a corresponding ima...

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Bibliographic Details
Main Authors ROIMELA KIMMO, ITAERANTA JOONAS, AARNIO TOMI
Format Patent
LanguageChinese
English
Published 19.05.2010
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A method for encoding an image having color components of each image pixel represented by a value of a high dynamic range (HDR), the method comprising: decomposing the image into image blocks; determining a scaling factor for each image block, said scaling factor, when applied to a corresponding image block, for converting the values of the color components into a normalized range; and compressingthe normalized image blocks and the scaling factors of each image block independently of each other, whereby the normalized image blocks are encoded according to a low dynamic range (LDR) compressionmethod. When decoding, the encoded image data are decomposed into encoded image blocks, which are decoded according to the LDR compression method. The values of the color components are scaled with acorresponding scaling factor included in the auxiliary data; and the scaled image blocks are composed into an image with the original dynamic range.
Bibliography:Application Number: CN200680001687