Abstract: Contrast enhancement is usually used to adjust the global brightness and contrast of digital images. Malicious users may also locally perform contrast enhancement for creating a realistic composite image. As such it is necessary to detect contrast enhancement for verifying the authenticity and originality of the digital images. to detect the contrast enhancement involved manipulations in digital images here two novel algorithms are proposed.First one focus on the detection of global contrast enhancement, which is applied to the previously JPEG-compressed images. Second, is to identify the composite image created by making contrast adjustment on either one or both source images. Titanium-coated surfaces are prone to minute defects such as tiny cracks, which are not easily recognizable by the naked eye or optical microscopy. Two new thresholding methods, namely contrast-adjusted Otsu’s method and contrast-adjusted median-based Otsu’s method are proposed, for defect detection in the titanium-coated aluminium surfaces.
Keywords: Contrast Enhancement, Composite image, Edge Detection, Defect Detection.
Title: Contrast Enhancement Based Forensic Detectability And Image Quality
Author: Anjali U
International Journal of Computer Science and Information Technology Research
ISSN 2348-120X (online), ISSN 2348-1196 (print)
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