Enhancement by Multiscale Nonlinear Operators

Andrew Laine 1 Introduction 33

Columbia University 2 One-Dimensional Discrete Dyadic Wavelet Transform 34

Walter Huda 2'1 General Structure and Channel Characteristics • 2.2 Two Possible Filters

SUNY Upstate Medicnl 3 Linear Enhancement and Unsharp Masking 37

University 3.1 Unsharp Masking • 3.2 Inclusion of Unsharp Masking Within the RDWT Framework

4 Nonlinear Enhancement by Functional Mapping 38

4.1 Minimum Constraint for an Enhancement Function • 4.2 Filter Selection • 4.3 A Nonlinear Enhancement Function • 4.4 Enhancement Techniques

5 A Method for Combined Denoising and Enhancement 41

5.1 Incorporating Wavelet Shrinkage into Contrast Enhancement • 5.2 Threshold Estimation for Denoising

6 Two-Dimensional Extension 45

7 Experimental Results and Comparison 45

8 Conclusion 52

References 53

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