• Priyashi gogoi
• Shikha Choudhary

Digital image forensics is a branch of image processing that analyzes an image in order to establish its truthfulness and authenticity3. Digital image forensic techniques include two approaches- active and passive approaches4. The active approach requires the digital image to be embedded with certain information in the form of digital watermarking or signatures during its acquisition. This embedded information is later checked to establish authenticity of the image and is usually robust and imperceptible against most of the attacks like compression, rotation, cropping, resampling, filtering, addition of noise etc. But, a major drawback of active approach is that specially designed digital cameras are required that are equipped with a watermarking chip or a digital signature chip which authenticates every image the camera takes before storing it on its memory card. So, digital signatures and watermarking (active approach) as image forgery detection tools are not widely used.

Digital Image, Image processing

"Comparison and analysis of Passive-blind techniques for detection of digital image", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.406-434, December 2018, Available :http://www.jetir.org/papers/JETIRDT06054.pdf

"Comparison and analysis of Passive-blind techniques for detection of digital image", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp406-434, December 2018, Available at : http://www.jetir.org/papers/JETIRDT06054.pdf