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Tutorial Sheet 2 for CS3246 Digital Multimedia and Compression 1. What is the histogram of an look? addicted a monochromous 4-bit fig, describe how you would extract the histogram. appear the mean and touchstone variance of an image. Explain what does it mean if the old-hat deviation of an image is broad(prenominal)? Is this meter reading reliable? How to eject this problem of unreliable interpretation? 2. For spatial filtering utilise a 2-D mask, describe how do you administer the case when the mask is at the edge of an image? 3. The probability distribution of four alphabets, A, B, C and D, is the selfsame(prenominal) as the pastime alphabet sequences: BABCAAA BBBAABCCD BBCCBBA AAABCBB a) Design the Huffman labels to replace the above alphabets to achieve optimum bit rate. What is the average dwell egg in mark sizing when apply the Huffman code as comp ard to fixed size codes? b) Write down the coded image of the following alphabet sequence. ABCDDB 4. say there is a source, which has devil attributes in the alphabet A and B. The probabilities of the occurrence of these symbols are: p(A)=0.1 and p(B)=0.9. a) What is the authorize of bits per symbol and what is the entropy? b) this instant suppose that instead of tag separately symbol at a time, two dependable-strength symbols are coded in a combined fashion using Huffman coding.

What is the number of bits per symbol utilise and what is the entropy? c) Comment on the results obtained. 5. LZW charge up contraction algorithm is used in GIF to perform image compression. a) delimitate the essential components of LZW algorithm using a in instruct pseudo codes, and explain how LZW achieves the compression. b) Given two images of identical keep in but rotated by 90o as shown in go for 1. Would the size of the LZW-compressed versions of these two images the same? If not, which is larger and explain hence there is a deflection? Figure 1(a) Figure 1(b) 6. one of the popular image format, GIF, uses basically RLE and LZW for compression. Comment on what types of images...If you essential to get a full essay, order it on our website: Ordercustompaper.com

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