Multi-dimensional vector discrete cosine transform coefficients matrix scan mode for image compression

It has been show that efficient scan technique serves to enhance the performance of image compression. In this paper, we study means of improving multi-dimensional discrete cosine transform (DCT) coding by proposing two scan modes for three-dimension (3-D) DCT coefficient matrix. Then we conduct compression processing on color image based on four-dimensional (4-D) vector DCT orthogonal transform. Simulation results demonstrate that the proposed modes provide better compression performance than JPEG.