WL Operator: A Robust Quasi High-Pass Filter for Edge Detection in Medical Images
Keywords:
Edge Detection, Medical Images, Quasi High-Pass Filter, WL Operator, Kernel-Based Algorithm, Spatial Isotropic Symmetry, Medical Imaging Modalities.Abstract
In this study, we propose a robust edge detection method for medical images using the WL operator (Wang and Lin). The operator is based on a kernel-based algorithm, similar to conventional edge detectors, but with an adaptive and mathematically formulated approach. By expressing the detector as a quadratic form of the Toeplitz matrix, we exploit its highly structured internal architecture and spatial isotropic symmetry. The WL operator addresses common edge detection challenges such as fragmentation, position dislocation, and thinness loss, while being robust to noise and efficient in extracting crucial edge features. Comparative evaluations against other edge detectors, using Pratt's figure of merits and expert visual analog scale scores, demonstrate the superior performance of the WL operator. Furthermore, the operator shows promising results in various medical imaging modalities, including X-ray, CT, and MRI, encouraging further investigation.
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