Contrast Enhancement of Images with Poor Lighting Based on Watersheds

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2014 by IJETT Journal
Volume-15 Number-4
Year of Publication : 2014
Authors : A. Nagaraja Rao , K. Ratna Babu , J. Sasi Kiran , K. Kanthi Kumar


A. Nagaraja Rao , K. Ratna Babu , J. Sasi Kiran , K. Kanthi Kumar. "Contrast Enhancement of Images with Poor Lighting Based on Watersheds", International Journal of Engineering Trends and Technology (IJETT), V15(4),165-169 Sep 2014. ISSN:2231-5381. published by seventh sense research group


The contrast enhancement is the general problem in digital image processing and it can be solved from different techniques. In this paper, an innovative method is proposed to enhance the images with poor lighting using the frequency of watersheds. Here, watersheds are used to identify the dark regions depending on the difference parameter which describes the homogeneity of a region. To increase the contrast of these regions, contrast Adjust (CA) is added to the dull image pixels which are identified by the watersheds in the local neighborhood of an image of N X N order. The contrast Adjust is changes region to region depending on the frequency of watersheds in the neighborhood. The proposed method is applied on different images with poor lighting and the results are shown to analyze the performance of the method.


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Enhancement, watershed frequency, Contrast Adjust, Histogram, Catchment basin.