Encoding, decoding, and representing high dynamic range images
First Claim
1. A device, comprising:
- an input interface configured to access a high dynamic range (HDR) image;
a processor configured to execute instructions to;
generate a luminance ratio image based on luminance pixel values of the HDR image and a tone-mapped (TM) image, the TM image generated based on the HDR image;
generate a re-mapped HDR image based on the luminance ratio image and the HDR image;
generate residual values in color channels of a color space based on the re-mapped image and the TM image; and
an output interface configured to output the TM image with HDR reconstruction data, the HDR reconstruction data being derived from the luminance ratio image and the residual values.
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Abstract
Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. 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 would not be recoverable from the TM image with 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.
41 Citations
15 Claims
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1. A device, comprising:
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an input interface configured to access a high dynamic range (HDR) image; a processor configured to execute instructions to; generate a luminance ratio image based on luminance pixel values of the HDR image and a tone-mapped (TM) image, the TM image generated based on the HDR image; generate a re-mapped HDR image based on the luminance ratio image and the HDR image; generate residual values in color channels of a color space based on the re-mapped image and the TM image; and an output interface configured to output the TM image with HDR reconstruction data, the HDR reconstruction data being derived from the luminance ratio image and the residual values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A decoder, comprising:
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an input interface configured to access an image file comprising a tone-mapped (TM) base image and high dynamic range (HDR) reconstruction data, the HDR reconstruction data comprising a luminance ratio image and residual values in color channels of a color space; a processor configured to generate a first HDR image based on the tone-mapped base image and the luminance ratio image; and an output interface configured to output an output HDR image, the output HDR image reconstructed by the processor using the first HDR image and the residual values in the color channels of the color space. - View Dependent Claims (12, 13, 14, 15)
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Specification