| Techreport |
| Type of Publication |
| Empirical Evaluation of Boundary Policies for
Wavelet-Based Image Coding |
| Title |
|
| Authors |
| Technical Report TR-01-007, Department for Mathematics and Computer Science,
University of Mannheim, April 2001 |
| Published in |
| The wavelet transform has become the most
interesting new algorithm for still image compression. Yet there
are many parameters within a wavelet analysis and synthesis which
govern the quality of a decoded image. In this paper, we discuss
different image boundary policies and their implications for the
decoded image. A pool of gray-scale images has been
wavelet-transformed with different settings of the wavelet filter
bank and quantization threshold and with three possible boundary
policies. Our empirical evaluation is based on three benchmarks:
a first judgement regards the perceived quality of the decoded
image. The compression rate is a second crucial factor. Finally,
the best parameter settings with regard to these two factors is
weighted with the cost of implementation. Contrary to the new
standard JPEG-2000, where mirror padding is implemented, our
investigation proposes circular convolution as the boundary
treatment. |
| Abstract |
|
Wavelet Analysis
Image Coding
Boundary Policies
Empirical Evaluation
|
| Keywords |
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