Paper Info
Title
An innovative technique for contrast enhancement of computed tomography images using normalized gamma-corrected contrast-limited adaptive histogram equalization.
Abstract
Image contrast is an essential visual feature that determines whether an image is of good quality. In computed tomography (CT), captured images tend to be low contrast, which is a prevalent artifact that reduces the image quality and hampers the process of extracting its useful information. A common tactic to process such artifact is by using histogram-based techniques. However, although these techniques may improve the contrast for different grayscale imaging applications, the results are mostly unacceptable for CT images due to the presentation of various faults, noise amplification, excess brightness, and imperfect contrast. Therefore, an ameliorated version of the contrast-limited adaptive histogram equalization (CLAHE) is introduced in this article to provide a good brightness with decent contrast for CT images. The novel modification to the aforesaid technique is done by adding an initial phase of a normalized gamma correction function that helps in adjusting the gamma of the processed image to avoid the common errors of the basic CLAHE of the excess brightness and imperfect contrast it produces. The newly developed technique is tested with synthetic and real-degraded low-contrast CT images, in which it highly contributed in producing better quality results. Moreover, a low intricacy technique for contrast enhancement is proposed, and its performance is also exhibited against various versions of histogram-based enhancement technique using three advanced image quality assessment metrics of Universal Image Quality Index (UIQI), Structural Similarity Index (SSIM), and Feature Similarity Index (FSIM). Finally, the proposed technique provided acceptable results with no visible artifacts and outperformed all the comparable techniques.
Year
DOI
Venue
2015
10.1186/s13634-015-0214-1
EURASIP J. Adv. Sig. Proc.
Keywords
Field
DocType
Computed tomography, Contrast enhancement, Histogram equalization, Normalized gamma-corrected function
Histogram,Computer vision,Computer science,Histogram matching,Image quality,Adaptive histogram equalization,Artificial intelligence,Histogram equalization,Gamma correction,Grayscale,Brightness
Journal
Volume
Issue
ISSN
2015
1
1687-6180
Citations 
PageRank 
References 
6
0.44
25
Authors
6
Name
Order
Citations
PageRank
Zohair Al-Ameen191.88
Ghazali Sulong2408.26
Amjad Rehman318123.00
Abdullah Al-Dhelaan452339.77
Tanzila Saba532647.33
Mznah Al-Rodhaan630622.90