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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....
The quantization process is a choice for signal after pretreatment. On the premise of guarantee of image quality, we can throw away information which has little effect on visual effect. Because quantization process is origin of information loss based on DCT coding and decoding, the quantizer is good or bad which has effect on coding efficiency and the quality of reconstructed image directly. This...
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