Intensity-based gain adaptive unsharp masking for image contrast enhancement

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Conference Proceeding
2012 5th International Congress on Image and Signal Processing, CISP 2012, 2012, pp. 529 - 533
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With the increasing application of image processing techniques in various areas, contrast enhancement still remains as a core pre-processing element that critically affects the performance of subsequent procedures. Among the available enhancement methods, unsharp masking is one of the efficient approaches that could produce satisfactory results on a wide range of digital images. However, properly setting the unsharp masking algorithmic parameters is a challenging task. In this work, a gain adaptive scheme is proposed where enhancements are focused on the mid-range intensity regions. This approach effectively makes use of a Gaussian kernel to adjust the enhancement gain and reduces the probability of over-range artefact occurrences. Experiments are conducted on a collection of public available digital colour images and in-house captured real world images. Satisfactory test results have illustrated the performance of the proposed method. © 2012 IEEE.
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