Book ChapterDOI
Selective Edge Enhancement Using Walsh Filters
Joydeep Chatterjee,Semanti Chakraborty,Kanik Palodhi +2 more
- pp 143-149
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TLDR
In this paper, the authors proposed a simple yet very useful method for selective edge enhancement using azimuthal Walsh patterns, named after its formulator Joseph Walsh, of different orders used in the Fourier domain.Abstract:
Edge enhancement has proved to be a handy means for image engineers for pattern recognition and diseased cell discrimination. An advanced form of this technique, facilitating directional highlighting of the edges is more helpful for directional asymmetry search in the patterns. The present abstract proposes a simple yet very useful method for selective edge enhancement using azimuthal Walsh patterns, named after its formulator Joseph Walsh, of different orders used in the Fourier domain. In this chapter, simulations of selective edge enhancement using azimuthal Walsh filters have been shown and resultant images have been projected using a set-up containing Spatial Light Modulator (SLM). The method has been successfully applied to blood cell SEM image. The method is easy to implement with reasonable the computation capacity.read more
Citations
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Proceedings ArticleDOI
Characterization of biomedical images using Walsh filters followed by convolution
TL;DR: In this paper, a directional and selective edge highlighting using Walsh filters has been proposed to distinguish between a normal cell and a diseased cell using this selective edge enhancement followed by arc convolutions.
References
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Journal ArticleDOI
A Closed Set of Normal Orthogonal Functions
TL;DR: In this article, the authors studied a new closed set of functions normal and orthogonal on the interval (0, 1) for the interval 0 5 x 5 1, where each function takes only the values + 1 and − 1, except at a finite number of points of discontinuity, where it takes the value zero.
Journal ArticleDOI
Spiral phase filtering and orientation-selective edge detection/enhancement
TL;DR: It is found that one can achieve anisotropic edge enhancement by breaking down the symmetry of the filtering process and interpreting this process as a vortex formation due to the diffraction of the Fourier spectrum of the input pattern by a SPF with an integer and fractional topological charge.
Journal ArticleDOI
Selective edge enhancement using anisotropic vortex filter.
TL;DR: A new method for selective edge enhancement of amplitude objects using the anisotropic vortex phase mask is proposed by introducing anisotropy in a conventional vortex mask with the help of the sine function.
Journal ArticleDOI
Walsh Functions in Problems of Optical Imagery
M. De,Lakshminarayan Hazra +1 more
TL;DR: A reformulation of Walsh functions in polar coordinates facilitates the analysis which is presented, along with a restatement of the basic properties of these functions pertinent to the purpose.
Journal ArticleDOI
Selective edge enhancement of images with an acousto-optic light modulator.
Jeffrey A. Davis,Maria Nowak +1 more
TL;DR: This work shows experimental results for image processing using an acousto-optic light modulator (AOLM) where the image can be edge enhanced with respect to the input object and relates this technique to the fractional Hilbert transform and the fractionsal derivative image-processing operations.