IMAGE ENCODING DEVICE AND IMAGE DECODING DEVICE

摘要

According to an embodiment, an image encoding device assigns colors to pixels in a pixel block to encode an image. The device includes a generating unit to generate one or more provisional representative colors for pixels to be encoded and provisional indices for identifying the provisional representative colors based on colors assigned to encoded pixels; a updating unit to generate one or more determined representative colors to be used for expressing the pixels in the pixel block and indices for individually identifying the determined representative colors based on the pixels to be encoded and the provisional representative colors, and generate update information for updating the provisional representative colors and the provisional indices with the determined representative colors and the indices; an assigning unit to generate assignment information indicating the indices assigned to the pixels to be encoded; and an encoding unit to encode the update information and the assignment information.

主权项

1. An image encoding device:
a processor; and a memory that stores processor-executable instructions that, when executed by the processor, cause the processor to: generate one or more provisional representative colors for target pixel to be encoded and provisional indices identifying the provisional representative colors based on a color assigned to an encoded pixel; generate one or more determined representative colors to be used for expressing the pixels in the pixel block and indices for individually identifying the determined representative colors on the basis of the pixels to be encoded and the provisional representative colors, and generate information for updating the provisional representative colors and the provisional indices with the determined representative colors and the indices; generate assignment information in which the respective indices are assigned to the respective pixels in the pixel block to be encoded; and encode the information and the assignment information.