Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Digital Image Enhancement in Matlab: An Overview on Histogram Equalization and Specification

Version 1 : Received: 21 November 2018 / Approved: 23 November 2018 / Online: 23 November 2018 (14:17:13 CET)

How to cite: Arif, R.B.; Khan, M.M.R.; Siddique, M.A.B. Digital Image Enhancement in Matlab: An Overview on Histogram Equalization and Specification. Preprints 2018, 2018110565. https://doi.org/10.20944/preprints201811.0565.v1 Arif, R.B.; Khan, M.M.R.; Siddique, M.A.B. Digital Image Enhancement in Matlab: An Overview on Histogram Equalization and Specification. Preprints 2018, 2018110565. https://doi.org/10.20944/preprints201811.0565.v1

Abstract

This paper has two major parts. In the first part histogram equalization for the image enhancement was implemented without using the built-in function in MATLAB. Here, at first, a color image of a rat was chosen and the image was transformed into a grayscale image. After this conversion, histogram equalization was implemented on the grayscale image. Later on, in the same image for each RGB channel, histogram equalization was implemented to observe the effect of histogram equalization on each channel. In the end, the histogram equalization was implemented to this specific color image of a rat. In the second part, for the grayscale image in part 1, the desired histogram of another colored image of a rat was introduced and histogram specification was implemented on the original colored image.

Keywords

Digital image processing, color image, grayscale image, histogram equalization, histogram specification, image enhancement, RGB channel

Subject

Computer Science and Mathematics, Probability and Statistics

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