In order to protect the copyright of the image in the condition of the image quality

It brings forward a kind of the image non watermarking method. It introduces the non watermarking scheme

then it discusses the concrete process of this scheme at length. This method changes the traditional doings that the copyright of the image is protected by embedding the watermarking into the image to the method that the watermarking is drew out from the image

The central idea of this method is: the image wavelet coefficients are selected correctly firstly

then they are located and managed as the basic informations of the image.When the authentication image is to be identified

the same process is done to draw the informations out from the authentication image and those informations will be analyzed and detected to judged the copyright and the ownership of the image.It demonstrates this method is right by some tests. These tests prove that the method could make image distortion free and be robust

simple

easy to use. Lastly

it makes the method broaden and watermarking can be drew out from the image and embedded outside the image.This method not only can satisfy the need of the image authentication

but also can be used to hide the data.