Double quantization

Fast, Automatic and Fine-Grained Tampered JPEG Images Detection via DCT Coefficient Analysis

In this paper, we focus on JPEG images and propose detecting tampered images by examining the double quantization effect hidden among the discrete cosine transform (DCT) coefficients.

Detecting Doctored JPEG Images via DCT Coefficient Analysis

We propose an approach that can detect doctored JPEG images and further locate the doctored parts, by examining the double quantization effect hidden among the DCT coefficients.