NDLI: Contrast-based image enhancement algorithm using grey-scale and colour space

Content Provider	IET Digital Library
Author	Nandal, Amita Bhaskar, Vidhyacharan Dhaka, Arvind
Abstract	The method presented encodes red, green and blue (RGB) images. When RGB images are added, the result inherently becomes darker due to summation of grey-scale images. This image is enhanced by adjusting brightness and contrast to achieve a visually pleasing image. The method developed uses hue saturation value (HSV) and contrast enhancement (CE) to obtain enhanced color images. It can be used to combine imaging modality of a multimodal data set to represent multimodal data sets in color image without data loss. In HSV color space, grey scale and color information are in separate channels, so the combined images do not suffer from the same darkening contrast as the images combined in RGB color space suffer. The method proposed first involves computation of mapping function, then gradient-based function is calculated to map image gradients based on grey-level (GL) intensity and eigenvalue computation is used for CE. Therefore, the contrast of GL components of gradient of an image is enhanced by a mapping function. A better visual output is ensured using the proposed algorithm which is evaluated using performance metrics. When compared to adaptive histogram equalisation and contrast-based imaging algorithms, the proposed technique gives significant performance in contrast and color enhancement.
Starting Page	514
Ending Page	521
Page Count	8
ISSN	17519675
Volume Number	12
e-ISSN	17519683
Issue Number	Issue 4, Jun (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/12/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2017.0272
Journal	IET Signal Processing
Publisher Date	2018-01-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Brightness Brightness Adjustment Colour Information Computer Vision And Image Processing Technique Contrast Adjustment Contrast Enhancement Contrast-based Image Enhancement Algorithm Eigen Values And Eigen Function Eigenvalue Computation GL Intensity Gradient Method Gradient-based Function Grey Scale Information Grey-level Intensity Grey-scale Image Grey-scale Space HSV Colour Space Hue Saturation Value Image Coding Image Colour Analysis Image Enhancement Imaging Modality Interpolation And Function Approximation Linear Algebra Mapping Function Computation Multimodal Data Set Representation Numerical Analysis Optical, Image And Video Signal Processing Performance Metrics Red-green-and-blue Image RGB Image
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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