基于数字水印技术的数码照片真实性认证

由于数码照片能被电脑进行各种处理，从而使数码照片的真实性受到质疑。为了认证数码照片的真实性，采用了新出现的数字水印技术。根据数码相机的工作原理，提出用数码相机拍照时，自动在JPEG压缩过程中嵌入数字水印。鉴别照片真伪时，从中提取数字水印。研究结果表明：观察数字水印有无变化，可有效地鉴别照片真伪，并且还能进一步指出照片被篡改的位置。

The Reality Authentication of Digital Photograph Based on Digital Watermarking

Because of digital photograph being easily edited by computer, reality of photograph is under suspicion. Authenticating reality of digital photograph, this paper applies novel digital watermarking technique. Based on the working principles of digital camera, we present that digital watermarking is automatically embedded in photograph when digital camera compress photograph into JPEG stored format We extract watermarking from the photo when reality of digital photograph is authenticated. The experiments show that, we can authenticate reality of photo effectively, observing the changes of watermarking, and can locate any alteration made on the photo.