IMAGE ENCODER AND IMAGE DECODER

摘要

An image encoder comprises an extreme value determiner, a floating point-to-integer converter and an encoder. The extreme value determiner determines a minimal value and a maximal value of a floating point image value of each pixel of a part of an image, an image or a group of images. The floating point-to-integer converter maps the floating point image value of each pixel to an integer image value, wherein each integer image value lies in the predefined range of integer image values. The determined minimal floating point image value is mapped to a minimal integer image value of the predefined range of integer image values and the determined maximal floating point image value is mapped to a maximal integer image value of the predefined range of integer image values. Further, the encoder encodes the integer image value of each pixel to obtain and provide encoded image data of the part of the image, the image or the group of images.