Digital Image Processing ECE 533
Assignment 8
Image Compression
Due date: May 15, 4 PM, in my office or by email
Department of Electrical and Computing Engineering,University of New Mexico.
May 6, 2008
From the text: Problems 8.5, 8.9(a–d), 8.17, 8.19
Problem 1. Huffman coding: Download from http://www.ece.unm.edu/~jpezoa/tmp
the file Huffman.zip, which contains the following files: File.txt, Lena.raw (a 512×512
pixels Lena saved as a binary image with 8 bits per pixel), encoder.exe, and decoder.exe.
Put all of them in a single directory.
To encode a file called input.txt, using ksymbols at a time, and rpercent perturba-
tion of the nominal probabilities, type the following at the MS-DOS command: encoder
input.txt output.txt k r. This puts the Huffman code for input.txt in the file output.txt
To decode the file output.txt and put in the file input.txt, type: decoder output.txt
input.txt k r
1. Open the image Lena.raw and calculate the empirical probabilities for the occurrence
of each symbol.
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