Non-embedded image coding techniques based on pixels classification

In this paper, new techniques for the DCT image coding based in pixels classifications are proposed. Two image coding approaches based on the object extraction are presented to study the effect of the object based image coding on the compression quality. Moreover, modification of the traditional JPEG method based on region-of-interest coding is achieved. In the beginning of all approaches, the image is subdivided into a block of pixels with block size of NxN. Firstly; the block must be classified as foreground or background block based on a preprocessing step. The foreground blocks will be compressed via JPEG technique but with significant quantized coefficients and the DC coefficient only from one block in the background is used to code it. The simulation result shows that the proposed technique provides competitive compression performance relative to the traditional JPEG technique.