Multimedia BSC Solutions 2002 - Cardiff University

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CM0340(ii) Explain why one has a better compression ratio than the other. Whatproperties of the data lead to this result?Data has only one repeated token the 0. So coding is wasted on rapidly changingremainder of data in run length encoding where every token frequency countneeds recording. 2 Marks12 Marks for all of PART (d) ALL WORK UNSEEN8
CM03403. (a) Briefly outline the basic principles of Inter-Frame Coding in Video Compression.Essentially Each Frame is JPEG encoded• Macroblocks are 16x16 pixel areas on Y plane of original image.A macroblock usually consists of 4 Y blocks, 1 Cr block, and 1 Cb block.• Quantization is by constant value for all DCT coefficients (i.e., no quantizationtable as in JPEG).The Macroblock is coded as follows:• Many macroblocks will be exact matches (or close enough). So send address ofeach block in image -> Addr9
Page 1 and 2: CM0340CARDIFF CARDIFF UNIVERSITYEXA
Page 3 and 4: CM0340Multimedia systems may have t
Page 5 and 6: CM0340Lossless Compression-- where
Page 7: CM0340(d) Show how you would encode
Page 11 and 12: CM0340Desired Rate = 1.5 Mbits/SecD
Page 13 and 14: CM0340The Movie Toolbox-- Your appl
Page 15: CM0340standard file preview functio

Multimedia BSC Solutions 2002 - Cardiff University

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