Name
Abstract | ||
|---|---|---|
In this paper, a simple yet reliable algorithm to detect the presence of nonaligned double JPEG compression (NA-JPEG) in compressed images is proposed. The method evaluates a single feature based on the integer periodicity of the blockwise discrete cosine transform (DCT) coefficients when the DCT is computed according to the grid of the previous JPEG compression. Even if the proposed feature is computed relying only on DC coefficient statistics, a simple threshold detector can classify NA-JPEG images with improved accuracy with respect to existing methods and on smaller image sizes, without resorting to a properly trained classifier. Moreover, the proposed scheme is able to accurately estimate the grid shift and the quantization step of the DC coefficient of the primary JPEG compression, allowing one to perform a more detailed analysis of possibly forged images. |
Year | DOI | Venue |
|---|---|---|
2012 | 10.1109/TIFS.2011.2170836 | IEEE Transactions on Information Forensics and Security |
Keywords | Field | DocType |
jpeg images,jpeg artifacts,lattices,dct,forensics,discrete cosine transform,digital image,image compression,transform coding,data compression,quantization,digital images,dc coefficient | Computer vision,Lossless JPEG,Pattern recognition,Compression artifact,Computer science,Discrete cosine transform,Transform coding,Digital image,JPEG,Artificial intelligence,Quantization (image processing),Data compression | Journal |
Volume | Issue | ISSN |
7 | 2 | 1556-6013 |
Citations | PageRank | References |
58 | 1.85 | 6 |
Authors | ||
2 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Tiziano Bianchi | 1 | 1003 | 62.55 |
| Alessandro Piva | 2 | 2231 | 157.21 |