Image Rotation Angle Blind Detecting Algorithm Based Spectrum Character

doi:10.13190/jbupt.200603.22.wuht

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2006, Vol. 29 ›› Issue (3): 22-26.doi: 10.13190/jbupt.200603.22.wuht

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Image Rotation Angle Blind Detecting Algorithm Based Spectrum Character

WU Hong-tao ZHU Bo-cheng

Department of Electronic, Peking University

Received:2005-10-25 Revised:1900-01-01 Online:2006-06-30 Published:2006-06-30
Contact: ZHU Bo-cheng

Abstract

Abstract:

It's difficult to detect blindly the image rotation angle in blind watermarking under geometry attack. By analyzing image spectrum, the character of spectrum amplitude ridge contained in image borderline is discovered. The practical distinguishing character filter is designed while character sharp filter can avoid the interfere whose amplitude ridge isn’t axial. The angle of spectrum amplitude ridge in black-white character image can be calculated by Hough transform, that is the value of image rotation angle model л/2. The experiment result proves the proposed algorithm has light computational load and high precision without original image. It can endure the attacks of geometry attack, low-pass filter, noise additional, lossy compression at the same time.

Key words: digital watermark, geometry attack, spectrum character, Hough transform

CLC Number:

TP391

WU Hong-tao ZHU Bo-cheng. Image Rotation Angle Blind Detecting Algorithm Based Spectrum Character[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2006, 29(3): 22-26.

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Image Rotation Angle Blind Detecting Algorithm Based Spectrum Character

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