Enhancing Contrast of Image by Filtering and Brightness Preserving Algorithm

Abstract: Visualisation of an image is an important parameter in the area of image processing. To obtain the better visualisation contrast enhancement is one of the important techniques. Contrast of an image is easily upgraded by maximize the difference between the adjacent pixel values, that can be obtained by the traditional technique histogram equalisation but in that some disadvantages like noise amplification, over and under enhancement may be present in that technique because of the uniform histogram in an output image. In order to minimise the presence of noise in an output image our proposed technique uses filtering operation before the enhancement process so the final image will have better visual quality with minimum brightness error value.

Keywords: Contrast Enhancement, Uniform Histogram Equalisation, Filtering Operation, Noise.