key2 - signals. The DCT transformation de-correlates the...

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CIS 6930 DMS, Fall 2011 Suggested Key of Homework 2 by Yan Deng ANS.1 Change to 256*256 Disadvantage: computational complexity increase; Artifacts become more visible in a large scale (block). Advantage: de-correlation ability become better when the block size increase. That means the statistical properties become more obviously which is better to do quantization (though the quantization table become larger). Change to 4*4 The effects reverse Actually the block size 8*8 is a tradeoff. We’d better to consider DCT transformation as a specific case of K -L theorem. We cannot treat the Image as a fix signal. Instead in the DCT transformation, we treat the Image sequences as the two-dimension random
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Unformatted text preview: signals. The DCT transformation de-correlates the signals correlations. ANS.2 When raising the quantizer scale factor, more information is lost; the compression ratio increases and the image quality becomes poorly. When decreasing the quantizer scale factor, the effects reverse. ANS.3 When decreasing the parameter quality , the compress ratio increases and the image quality decreases. Some students use the jpg file as the original file or rewrite the jpg file as the bmp file. Because the image has already lost the information, we can get very small compression ratio after compressing that. ANS.4 I,P,B,D Frames. Pg. 143-144 at the book Media Coding and Content Processing...
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This note was uploaded on 11/30/2011 for the course CIS 6930 taught by Professor Staff during the Fall '08 term at University of Florida.

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key2 - signals. The DCT transformation de-correlates the...

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