Patent ID: 9288489
Filing Date: 2016-03-15
CPC Classification: G06T,H04N

Claim Text:
1. An image encoding unit arranged to encode a high dynamic range image, comprising: a Low Dynamic Range (LDR) selector for identifying a low dynamic range of luminances, or corresponding range of luma code values, within a total range of luminances covered by the high dynamic range image, the low dynamic range of luminances or corresponding range of luma code values being so large that image information encoded within it is usable for LDR rendering; a High Dynamic range (HDR) selector for selecting at least one complementary range within the total range of luminances, comprising mostly luminances not covered by the low dynamic range of luminances; a code mapping unit arranged to encode in a first image, having at least a luma component comprising N bit code words, pixel luminances of the high dynamic range image falling within the low dynamic range of luminances to luma code values according to a first mapping, and pixel luminances of the high dynamic range image falling within the at least one complementary range to luma code values according to a second mapping, wherein the first and second mappings map to disjunct subranges of a range of luma code values of the first image.