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318076

An Automated Contrast Enhancement Technique for Remote Sensed Images

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Last updated: 24 Dec 2024

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Abstract

Remote sensing images often exhibit lower contrast than usual. Contrast Limited Adaptive Histogram Equalization (CLAHE) is a well-established and robust local contrast enhancement algorithm, renowned for its high-quality results, particularly in the medical domain. In this article, we introduce an automated contrast-limit adaptive histogram equalization method applied on remote sensing images, drawing inspiration from CLAHE. Our proposed algorithm incorporates automatic outlier detection blocks into the standard CLAHE framework, addressing the limitation of relying on a predetermined single clip-limit as is preset in traditional CLAHE. Instead, our approach adapts multiple clip-limits, one for each Contextual Region (CR), rather than a global clip-limit used in the original algorithm. First, the algorithm divides the image into tiles based on proximity, called contextual region, then it computes the histogram for each CR. In this stage, the CLAHE depends on clip-limit as pre-set user input to clip the intensities above clip-limit, then it redistributes the deducted intensities over the quantization range. On the contrary, the proposed algorithm calculates outliers of each CR and considers a clip-limit for the CR. Next, histogram equalization is performed on the modified CR histogram. Finally, Image is reconstructed by applying bilinear interpolation to outcome CRs. Experimental and comparison results showed that the proposed technique provides better results than classic CLAHE for remote sensing images on DOTA dataset. Moreover, the proposed algorithm achieves an improvement of 27.960 for PSNR and 3.271 for CG.

DOI

10.21608/ijci.2023.212239.1111

Keywords

Image processing, Remote Sensing, Contrast Enhancement, CLAHE, Satellite Images

Authors

First Name

Omar

Last Name

Kamel

MiddleName

-

Affiliation

IT,CI,Menofia

Email

omar.kamel@ci.menofia.edu.eg

City

-

Orcid

-

First Name

Khalid

Last Name

Amin

MiddleName

M.

Affiliation

Information technology dept., Faculty of computers and information, Menofia university

Email

kh.amin.0.0@gmail.com

City

-

Orcid

0000-0002-9594-8827

First Name

Noura

Last Name

Semary

MiddleName

A.

Affiliation

Inf. tech. dept. , Information and computers faculty, Menofia university

Email

noura.semary@ci.menofia.edu.eg

City

-

Orcid

-

First Name

Nagwa

Last Name

Aboelenien

MiddleName

-

Affiliation

IT,CI,Menofia

Email

nagwa.salim1@gmail.com

City

-

Orcid

-

Volume

11

Article Issue

1

Related Issue

45389

Issue Date

2024-01-01

Receive Date

2023-05-20

Publish Date

2024-01-01

Page Start

1

Page End

16

Print ISSN

1687-7853

Online ISSN

2735-3257

Link

https://ijci.journals.ekb.eg/article_318076.html

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https://ijci.journals.ekb.eg/service?article_code=318076

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Original Article

Type Code

877

Publication Type

Journal

Publication Title

IJCI. International Journal of Computers and Information

Publication Link

https://ijci.journals.ekb.eg/

MainTitle

An Automated Contrast Enhancement Technique for Remote Sensed Images

Details

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Article

Created At

24 Dec 2024