NDLI: Colour image enhancement with brightness preservation and edge sharpening using a heat conduction matrix

Content Provider	IET Digital Library
Author	Katırcıoğlu, Ferzan
Abstract	In this study, an enhancement process obtained by applying the heat conduction equation of solid and stagnant fluids on colour images is proposed. After the colour channel stretching, the RGB colour image was converted to the HSI model. The heat conduction equation was applied for each pixel on the I channel of the HSI colour model. The elements of the feature matrix called heat conduction matrix (HCM) can have negative, positive or zero values. A pixel with a small negative HCM value indicates that I needs level enhancement for a good image, whereas a small positive HCM value means that the I level value will be reduced and aligned with its neighbours. High positive or negative values are defined as the edges of the objects and the I level values of such pixels are not changed to protect the edges. In addition, whether HCM is negative or positive, the balanced increment and decrement path at a level I ensures that the mean brightness value performs natural protection. Finally, an enhanced image is obtained by transitioning from the HSI to the RGB colour model. Experimental results show that this method can enhance colour image details better than other methods.
Starting Page	3202
Ending Page	3214
Page Count	13
ISSN	17519659
Volume Number	14
e-ISSN	17519667
Issue Number	Issue 13, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/14/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2020.0393
Journal	IET Image Processing
Publisher Date	2020-08-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Brightness Brightness Preservation Colour Channel Colour Image Colour Image Details Colour Image Enhancement Computer Vision And Image Processing Technique Edge Sharpening Enhancement Process Feature Matrix Heat Conduction Heat Conduction Equation Heat Conduction Matrix HSI Colour Model Image Colour Analysis Image Enhancement Image Resolution Level Enhancement Level Value Matrix Algebra Mean Brightness Value Negative HCM Value Negative Value Optical, Image And Video Signal Processing Positive HCM Value Positive Value RGB Colour Image RGB Colour Model Solid Fluid Stagnant Fluid Zero Value
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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