Encoding, decoding, and representing high dynamic

专利名称：Encoding, decoding, and representing high

dynamic range images

发明人：Wenhui Jia,Ajit Ninan,Arkady Ten,Gregory

John Ward

申请号：US13675643申请日：20121113公开号：US08508617B2公开日：20130813

专利附图：

摘要：Techniques are provided to encode and decode image data comprising a tonemapped (TM) image with HDR reconstruction data in the form of luminance ratios and

color residual values. In an example embodiment, luminance ratio values and residualvalues in color channels of a color space are generated on an individual pixel basis basedon a high dynamic range (HDR) image and a derivative tone-mapped (TM) image thatcomprises one or more color alterations that would not be recoverable from the TMimage with a luminance ratio image. The TM image with HDR reconstruction data derivedfrom the luminance ratio values and the color-channel residual values may be outputtedin an image file to a downstream device, for example, for decoding, rendering, and/orstoring. The image file may be decoded to generate a restored HDR image free of thecolor alterations.

申请人：Dolby Laboratories Licensing Corporation

地址：San Francisco CA US

国籍：US

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