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Traditionally, the most commonly used sampling lattice in image processing systems is the rectangular sampling lattice. However, the minimum sampling density for a hexagonal sampling lattice is 13.4% less than that for a rectangular sampling lattice when the image signals which are band limited over a circular region of the Fourier plane. Hexagonal discrete cosine transform is applied to color image...
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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