可恢复的脆弱数字水印图像认证方法

Fragile Watermarking Method for Image Authentication and Recovery

目前数字图像等信息进行有效的认证和恢复是当前迫切解决的一个现实问题。对此文章设计了一种用于图像认证和保护的脆弱数字水印方法。该方法将图像分块并计算出其特征码，然后将分块图像的数据依次进行DCT变换、量化和变长编码；然后将特征码与变长码嵌入到arnold变换后的图像块中。实验结果表明：该方法在对图像质量影响极小的情况下。不仅可以较为精确的定位图像中的篡改位置，还可以较好的恢复被篡改的图像信息。

The current digital image by effective authentication and recovery is a realistic problem. A fragile watermarking method for image authentication and protection was designed. The method divided the image into some blocks and calculate the feature code of these blocks, then the block image data are sequentially by DCT, quantization and variable length coding; then the feature code and variable length codes to embed the image block for the Arnold transform, The experimental results show that the method in with minimal impact on image quality, not only can accurately locate tamper with the location of the image, also can recover the tampered image.