Contrast Enhancement Based Image Manipulation Detection

Today photograph may be used for several beneficial purpose such as evidence in court. Contrast enhancement is used for adjusting the brightness and contrast of a digital image. Users may change the contrast locally and many image editing softwares are now available. Malicious activities are also will happen, so a verification is needed to detect the authenticity of the image. Here proposes two algorithms, first for detecting the contrast enhancement based manipulation involved in JPEG compressed images and the second one is used for detecting composite image.