Employing SVD and Wavelets for Digital Image Forensics and Tampering Detection

This paper deals about employing wavelet based and SVD based watermarking for image forensics. The paper proposes ways of tampering detection from the watermark without actually using the original image (blind detection). This computation is done based on the positional values for the wavelet based watermarking and using the singular plane in the SVD method. We detect whether tampering has been done using the Wavelet based technique. We also show how to recover the original image data even from the tampered image with the retrieved watermark in the SVD method. Practical implementations of all the above techniques are done using MATLAB.