Laplacian filter based on color difference for image enhancement

Maria Sagrario Millan Garcia-Verela; Edison Valencia

doi:10.1117/12.590932

21 October 2004 Laplacian filter based on color difference for image enhancement

Maria Sagrario Millan Garcia-Verela, Edison Valencia

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.590932
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

The use of the Laplacian operator to enhance grayscale images by edge sharpening is widely known. The discrete application of this operator is made by convolving a mask whose kernel computes the weighted differences between neighbor pixels. The operator was extended to color images by applying it to each R, G, B, component separately and combining the result to yield the enhanced color image. In this work we apply the Laplacian operator to a color image by computing color differences between neighbor pixels in the CIELAB (CIEDE2000) space. The perceptual channels of Luminance, Chroma and Hue are used to obtain the resulting enhanced color image. N4 and N8-neighborhoods are considered. The results are compared with those obtained using the RGB channels separately. Using the Laplacian based on color difference, we obtain improved edge sharpening and artifact reduction in the resulting image.

Citation Download Citation

Maria Sagrario Millan Garcia-Verela and Edison Valencia "Laplacian filter based on color difference for image enhancement", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.590932

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