How to resist geometry transformation attacks effectively has become a focus of digital watermarking.

Digital image watermarking based on feather point against geometrical attacks;

In the face of geometrical attacks,all shortcomings of the almost all digital watermarking algorithms have been exposed.

The watermarking technique robust to both signal processing attacks and geometrical attacks is one of the hotspots and difficulties in the digital watermarking research.

3-D model watermarking resistant to geometric attack based on normalization;

Blind digital watermarking method against geometric attack;

Review on Blind Watermarking Against Geometric Attack;

Image watermark algorithm robust to geometric distortion in DWT domain;

Many proposed image watermarking techniques are sensitive to geometric distortions, such as rotation, translation and scaling.

In this approach,a rotation,scaling and translation invariant blind second generation watermarking technique is proposed using Tchebichef moments of the original image to estimate the geometric distortion parameters of the corrupted watermarked images.

Experiments demonstrate that the technique can well withstand such geometrical attacks as rotation, scaling, shearing and translation, and JPEG lossy compression.

In this paper,the attacks on image are geometrical attacks,including Flipping,Scale and Rotation.

In image watermarking,the watermark′s vulnerability to geometric attacks has long been a difficult problem.

Resistance to geometric attacks is a difficulty of digital watermarks,and it is also a bottleneck in practical use.

At present, the ability of counteracting geometric attacks hasn t completely achieved the request of application.