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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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ADV601JS Datasheet(PDF) 7 Page - Analog Devices |
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ADV601JS Datasheet(HTML) 7 Page - Analog Devices |
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7 / 52 page  ADV601 –7– REV. 0 THE PROGRAMMABLE QUANTIZER This block quantizes the filtered image based on the response profile of the human visual system. In general, the human eye cannot resolve high frequencies in images to the same level of accuracy as lower frequencies. Through intelligent “quantiza- tion” of information contained within the filtered image, the ADV601 achieves compression without compromising the visual quality of the image. Figure 7 shows the encode and decode data formats used by the quantizer. Figure 8 shows how a typical quantization pattern applies over Mallat block data. The high frequency blocks receive much larger quantization (appear darker) than the low frequency blocks (appear lighter). Looking at this figure, one sees some key point concerning quantization: (1) quantization relates directly to frequency in Mallat block data and (2) levels of quantization range widely from high to low frequency block. (Note that the fill is based on a log formula.) The relation between actual ADV601 bin width factors and the Mallat block fill pattern in Figure 8 appears in Table II. 9.7 WAVELET DATA 6.10 1/BW 15.17 DATA 0.5 15.0 BIN NUMBER QUANTIZER - ENCODE MODE TRNC SIGNED SIGNED UNSIGNED 1/BW QUANTIZER - DECODE MODE 8.8 BW 23.8 DE-QUANTIZED WAVELET DATA 9.7 WAVELET DATA 15.0 BIN NUMBER SIGNED SIGNED UNSIGNED SAT BW Figure 7. Programmable Quantizer Data Flow 41 38 35 32 26 23 29 20 17 14 8 5 11 2 39 36 33 30 24 21 27 18 15 12 6 3 9 0 Y COMPONENT 40 37 34 31 25 22 28 19 16 13 7 4 10 1 Cb COMPONENT Cr COMPONENT LOW HIGH QUANTIZATION OF MALLAT BLOCKS Figure 8. Typical Quantization of Mallat Data Blocks (Graphed) |
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