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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ADV611 데이터시트(PDF) 8 Page - Analog Devices |
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ADV611 데이터시트(HTML) 8 Page - Analog Devices |
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8 / 46 page  ADV611/ADV612 –8– REV. 0 41 38 35 32 26 23 29 20 17 14 8 5 11 2 Cr COMPONENT LOW HIGH QUANTIZATION OF MALLAT BLOCKS 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 Figure 10. Typical Quantization of Mallat Data Blocks (Graphed) 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 ADV611/ADV612 achieves compression without compromising the visual quality of the image. Figure 9 shows the encode and decode data formats used by the quantizer. Figure 10 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 ADV611/ADV612 bin width factors and the Mallat block fill pattern in Figure 10 appears in Table III. 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 BW SAT Figure 9. Programmable Quantizer Data Flow |
유사한 부품 번호 - ADV611_15 |
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유사한 설명 - ADV611_15 |
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