A multirate (MR) filter bank is called size-limited if the total number of output samples equals the number of input samples. A method called symmetric extension improved performance in subband image compression systems compared to the earlier method of circular convolution. However, the symmetric extension method was developed only for two-band uniform filter banks, and required even-length linear phase analysis filters. The authors generalize the symmetric extension method to the M-band, possibly nonuniform filter banks, where M=/>2. The length restriction on the analysis filters is relaxed.
We present the results of using the new MATLAB Image Processing Toolbox and the C programming language in a senior-level image processing course at the University oi Illinois. The course includes for the first time a formal lab component, so more time and effort have been devoted to computer algorithm implementation than previously. Students are expected to implement and test image processing algorithms in both MATLAB and C. We explore the benefits of using MATLAB and C to teach image processing, and we evaluate the students' results in the lab.
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