| 摘要 |
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 compressing the 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) compression method. In a decoding phase, 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 a corresponding scaling factor included in the auxiliary data; and the scaled image blocks are composed into an image with the original dynamic range.
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