Abstract: The disclosure provides a method for image compression and a device using the same method. The method includes: retrieving an image block including pixels, wherein each pixel include a plurality of channel data; defining root nodes according to an image compressing ratio of the image block; categorizing each channel data of each pixel into groups corresponding to the root nodes, wherein a structure of each group is a binary tree; if an empty tree exists in the aforementioned groups, dividing an non-empty tree of the groups into sub-trees and replacing the empty tree and the non-empty tree with the sub-trees to update the groups and the root nodes; building a center value of each group and determining a group index of each channel data of each group; encoding the center value of each group and characterizing each channel data as the corresponding center value and the group index to compress each channel data.

Abstract: The disclosure provides an image processing method and an image processing device. The method includes: obtaining a specific block from a specific block group of a specific image, wherein the specific block group includes blocks; compressing the specific block as a specific stream based on a predetermined compression ratio; when a length of the specific stream is not shorter than a predetermined block length, dividing the specific stream into a first sub-stream and a second sub-stream; storing the first sub-stream into a specific private block of a plurality of private blocks; finding an idle chunk out of shared chunks shared by the blocks; if the idle chunk is enough for storing the second sub-stream, storing the second sub-stream into the idle chunk and using a chunk usage information to record a number of the idle chunk.