Fragile watermarking tamper detection via bilinear fuzzy relation equations

We present a fragile color image watermarking based on the greatest solution of a bilinear fuzzy relation equation. The original image is coded with fuzzy transforms and divided in sub-images of sizes 2 × 2 called blocks. The watermark is applied on these blocks. A pre-processing phase is used to determine the best compression rate for the coding process. We test this scheme in tamper detection analysis on a sample of color images having different sizes. The results show that the proposed algorithm is better than that one obtained by using our previous method. Furthermore comparisons with various block-based fragile watermarking methods are made in our tests.