| 摘要 |
PROBLEM TO BE SOLVED: To provide techniques for encoding and decoding image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values.SOLUTION: In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that are not recoverable from the TM image and a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.SELECTED DRAWING: Figure 1 |
