METHOD AND DEVICE FOR ENCODING A HIGH-DYNAMIC RANGE IMAGE AND/OR DECODING A BITSTREAM

摘要

The present invention generally relates to a method and device for encoding an image. The method comprises: - encoding (12) a backlight image determined (11) from the image; - obtaining (13) a residual image by dividing the image by a decoded version of the backlight image, - obtaining (16) a tone-mapped residual image by tone-mapping the residual image; and - encoding (19) the tone-mapped residual image. The invention relates also to a method and device for decoding a bitstream representing a residual image calculated by dividing an image by a backlight image. Tone-mapping the residual image comprises either a gamma correction or a SLog correction according to the pixel values of the residual image.