传统上，在鉴别图像真伪时，采用事先在数字图像中嵌入数字水印或签名的方法。
The traditional method to distinguish true or false images is to embed digital watermarks or signatures in digital images in advance.
传统的利用分形编码嵌入数字水印的方法所需编码时间较长，对图像质量的影响大。
The traditional method of using fractal coding to embed watermarking often took a long time, which also strongly influenced the quality of images.
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。
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.
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