| 摘要 |
<p>A video coding method using wavelet with an adaptive scanning method has such main steps of: subjecting the input video signal to a horizontal and a vertical wavelet decomposition to obtain the base, horizontal, vertical and diagonal band of wavelet coefficients; recursively subjecting the resulting base band to further wavelet decomposition to obtain lower layers of base, horizontal, vertical and diagonal bands of wavelet coefficients; grouping the co-sited coefficients from the different layers of horizontal, vertical and diagonal bands into a plurality of horizontal, vertical and diagonal macro-bands, respectively; applying an adaptive quantization to quantize the above coefficients in the said horizontal, vertical and diagonal macro-bands, respectively; adaptively scanning and differentially coding the quantized coefficients in the said macro-bands into a plurality of one dimensional arrays, using a technique depending on orientation of the macro-bands and the distribution of the coefficients, and applying an entropy coding method to code each of the said arrays. <IMAGE></p> |
