Encoding, Decoding, and Representing High Dynamic Range Images
First Claim
1. A method to decode a high dynamic range (HDR) image, the method comprising:
- parsing an image file comprising a base image and an HDR reconstruction image, wherein the HDR reconstruction image comprises a luma ratio component image and one or more residual chroma component images; and
generating an output HDR image using the base image and the HDR reconstruction image.
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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.
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Citations
12 Claims
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1. A method to decode a high dynamic range (HDR) image, the method comprising:
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parsing an image file comprising a base image and an HDR reconstruction image, wherein the HDR reconstruction image comprises a luma ratio component image and one or more residual chroma component images; and generating an output HDR image using the base image and the HDR reconstruction image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A decoder for decoding a high dynamic range image (HDR), the decoder comprising:
a processor configured to execute instructions to; parse an image file comprising a base image and an HDR reconstruction image, wherein the HDR reconstruction image comprises a luma ratio component image and one or more residual chroma component images; and to generate an output HDR image using the base image and the HDR reconstruction image.
Specification