A Contrast Enhancement Method of Only the Region of Interest while Preserving Mean Brightness

2018 ◽  
Author(s):  
Hideaki Tanaka ◽  
Akira Taguchi
Keyword(s):  
Contrast Enhancement ◽  
Region Of Interest ◽  
Enhancement Method

A Contrast Enhancement Method for Improving Surface Defects Detection of Elevator Compensation Chain

2019 ◽  
Vol 33 (03) ◽  
pp. 1954011
Author(s):  
Jianjiang Zhu ◽  
Wei Ji ◽  
Jicheng Liu
Keyword(s):  
Contrast Enhancement ◽  
Surface Defects ◽  
Region Of Interest ◽  
Spatial Location ◽  
Logarithmic Function ◽  
Threshold Estimation ◽  
Segmentation Accuracy ◽  
Enhancement Method ◽  
Noise Threshold ◽  
Adaptive Noise

A contrast enhancement method based on the adaptive noise threshold estimation and logarithmic function in nonsubsampled contourlet transform (NSCT) domain is proposed, which can improve the defects segmentation accuracy of the elevator compensation chain. After extracting region of interest (ROI) according to the spatial location of defects, it is transformed into NSCT domain, where the high-frequency subband coefficients corresponding to noise is suppressed by the adaptive noise threshold estimation. Then, the logarithmic function transformation is used to enhance the image edges to a variable extent. Finally, the enhanced image is segmented by watershed algorithm based on laws texture analysis. Experimental results demonstrate that the performance of the proposed method is superior to the existing methods in terms of both the quality of contrast enhancement and the segmentation accuracy.

An image contrast enhancement method based on genetic algorithm

2010 ◽  
Vol 31 (13) ◽  
pp. 1816-1824 ◽  
Author(s):  
Sara Hashemi ◽  
Soheila Kiani ◽  
Navid Noroozi ◽  
Mohsen Ebrahimi Moghaddam
Keyword(s):  
Genetic Algorithm ◽  
Contrast Enhancement ◽  
Image Contrast ◽  
Image Contrast Enhancement ◽  
Enhancement Method

An Adaptive Contrast Enhancement Method for Palm Vein Image

2017 ◽  
pp. 240-249 ◽  
Author(s):  
Xiongwei Sun ◽  
Xiubo Ma ◽  
Chunyi Wang ◽  
Zede Zu ◽  
Shouguo Zheng ◽  
...  
Keyword(s):  
Contrast Enhancement ◽  
Enhancement Method ◽  
Palm Vein

Effective contrast enhancement method for color night vision

2012 ◽  
Vol 55 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Xiaoyan Qian ◽  
Yujin Wang ◽  
Bangfeng Wang
Keyword(s):  
Contrast Enhancement ◽  
Night Vision ◽  
Enhancement Method ◽  
Color Night Vision
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