Image sub-division and quadruple clipped adaptive histogram equalization (ISQCAHE) for low exposure image enhancement

Upendra Kumar Acharya; Sandeep Kumar

doi:10.1007/s11045-022-00853-9

Image sub-division and quadruple clipped adaptive histogram equalization (ISQCAHE) for low exposure image enhancement

Multidimens Syst Signal Process. 2023;34(1):25-45. doi: 10.1007/s11045-022-00853-9. Epub 2022 Sep 28.

Authors

Upendra Kumar Acharya^{1

2

3}, Sandeep Kumar¹

Affiliations

¹ Department of Electronics and Communication Engineering, National Institute of Technology, Delhi, India.
² Department of Electronics and Communication Engineering, Galgotias College of Engineering and Technology, Greater Noida, Uttar Pradesh India.
³ Department of Electronics and Communication Engineering, KIET Group of Institutions, Ghaziabad, Uttar Pradesh India.

Abstract

In this paper, a novel image sub-division and quadruple clipped adaptive histogram equalization (ISQCAHE) technique is proposed for the enhancement of low exposure images. The proposed method involves, computation of the histogram which includes a new approach of image sub-division, enhancement controlling mechanism, modification of probability density function (PDF) and histogram equalization (HE). The original histogram is segmented into sub-histograms based on exposure threshold and mean, to preserve the brightness and entropy. Then, individual sub-histogram is clipped separately to control the enhancement rate. For enhancing the visual quality, HE is applied to individual sub-histogram using the modified PDF. The experimental results show that, the proposed ISQCAHE method avoids the unpleasant artifacts effectively and provide a natural appearance to the enhanced image. It is simple, adaptive and performs superior than other techniques in terms of visual quality, absolute mean brightness error, entropy, Natural image quality evaluation, brightness preservation, structure similarity index measure and feature similarity index measure.

Keywords: Histogram clipping; Histogram equalization (HE); Histogram sub-division; Image enhancement; Low exposure images.

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