Brightness region-based apparatuses and methods for HDR image encoding and decoding

摘要

The image encoder (549) for encoding an image of a high dynamic range scene, comprising: a pixel texture encoding unit (552), arranged to encode pixels colors of the image with an image representation (Im 1) comprising N-bit code words; an image analysis unit (550) arranged to determine and output a region differentiator grey value (gTS), which is a luma value demarcating below it lumas of all pixels of a first object in at least one block of the image, and above it lumas of all pixels of a second object in the at least one block of the image; and a formatter (554) arranged to co-encode in an output image signal (S(Im_1, MET(gTS)) the image representation (Im 1) and the region differentiator grey value (gTS), makes highly versatile use of images encoding HDR scenes possible, in particular encoding them in image formats compatible with existing MPEG video coding standards.

主权项

1. An image encoder for encoding an image of a high dynamic range scene, comprising:
a pixel texture encoding unit configured to encode pixels colors of the image with an image representation comprising N-bit code words; an image analysis unit configured to determine and output a region differentiator grey value including a luma value demarcating below the luma value lumas of all pixels of a first object in at least one block of the image, and above the luma value lumas of all pixels of a second object in the at least one block of the image; and a formatter arranged to co-encode in an output image signal the image representation and the region differentiator grey value.