1 March 2003 Analysis and implementation of an efficient edge detection algorithm
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Optical Engineering, 42(3), (2003). doi:10.1117/1.1543564
Edges in grayscale digital imagery are detected by localizing the zero crossings of filtered data. To achieve this objective, truncated time- or frequency-sampled forms (FSFs) of the Laplacian-of-Gaussian (LOG) filter are employed in the transform domain. Samples of the image are transformed using the discrete symmetric cosine transform prior to adaptive filtering and the isolation of zero crossings. This paper evaluates an adaptive blockwise filtering procedure, based on the FSF of the LOG filter, which diminishes the edge localization error, emphasizes the signal-to-noise ratio around the edge, and extends easily to higher dimensions. Theoretical expressions and applications to digital images are presented.
Ramakrishnan Sundaram, "Analysis and implementation of an efficient edge detection algorithm," Optical Engineering 42(3), (1 March 2003). http://dx.doi.org/10.1117/1.1543564

Signal to noise ratio

Digital filtering

Bandpass filters

Image filtering

Electronic filtering

Optical filters

Edge detection

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