DCT-based resolution flexible image coding and decoding method
A decoding method and resolution technology, applied in the field of realizing scalable resolution, can solve problems such as the inability to realize scalable coding of resolution, and achieve the characteristics of scalable coding and decoding of resolution, saving transmission bandwidth, and flexible scalability Effect
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[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0029] The original image undergoes discrete cosine transformation (Discrete Cosine Transformation, referred to as DCT) and quantized coefficients ( figure 2 shown) according to the zigzag scan ( image 3 scanning order), the frequency increases in turn. However, for the frequency characteristics reflected by the DCT coefficients, this zigzag scanning coding mode cannot realize scalable coding of resolution. The present invention uses the frequency of the DCT quantized block and its corresponding positional relationship in the block, as well as the resolution characteristics, to arrange the same frequency in the same recombined coding block, and encode according to the priority of the resolution; in the decoding process, Restore its DCT position in the original macroblock according to the frequency of the received recombined coded block, and select an...
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