作业 4 手写

1. Ex 6 (a), Ex 8 on page 286

2. Given a picture with 4*4 pixels, their values are follows, using Huffman encoding  to code the pixels & calculate the average code length and the compression ratio.

3. Each DPCM coded DC coefficient is represented by (SIZE, AMPLITUDE), assume DPCM coefficients are: {60,3,5,6,4,2,6,5,1,17,33 } and huffman coding of 1~6 is showed in following table, write out the detail of (SIZE, AMPLITUDE) and the final entropy coding sequence. calculate the compression ratio.