Shape preserving local contrast enhancement

A novel approach for shape preserving contrast enhancement is presented. Contrast enhancement is achieved by means of a local histogram equalization algorithm which preserves the level-sets of the image. This basic property is violated by common local schemes, thereby introducing spurious objects an...

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Bibliographic Details
Main Authors: Caselles, V., Lisani, J.L., Morel, J.I., Sapiro, G.
Format: Conference Proceeding
Language:English
Subjects:
Color
Distribution functions
Histograms
Image processing
Inspection
Layout
Morphology
Pixel
Shape
Sun
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Summary:A novel approach for shape preserving contrast enhancement is presented. Contrast enhancement is achieved by means of a local histogram equalization algorithm which preserves the level-sets of the image. This basic property is violated by common local schemes, thereby introducing spurious objects and modifying the image information. The scheme is based on equalizing the histogram in all the connected components of the image, which are defined based on the image grey-values and spatial relations between its pixels. Following mathematical morphology, these constitute the basic objects in the scene. We give examples for both grey-valued and color images.
DOI:10.1109/ICIP.1997.647769