Alleviation of quantization artifact using anti-forensic in image processing

There are various image forensic methods that are available, which identify image tampering but these techniques are unable to address the anti-forensics method which are capable to hide the trace of image tampering. In this paper, a Dither based image compression technique for the removal of Quantization Artifact of Discrete Cosine Transform (DCT) based compressed image is proposed. Initially, the discrete cosine transform is applied on 8×8 blocks of input image to get the transform coefficients. The transform coefficients are than quantized with the help of quantization table which results in formation of quantization artifact in DCT based compressed image. To remove quantization artifact, an anti-forensic technique has been developed with the help of Anti-forensic dither. The execution of the proposed strategy is approved by utilizing PSNR and Structural SIMilarity (SSIM) list quality measurements. Higher estimations of these parameters in compression to some current compression procedure shows productivity of the proposed technique.