用于拷贝检测的鲁棒图像特征提取方法

用于拷贝检测的鲁棒图像特征提取方法 A Robust Feature Extraction Scheme in Image Copy Detection 余艳玮 YU Yanwei1 1 2 first-author 周学海 ZHOU Xuehai1 1 2 许华杰 XU Huajie3 3 中国科学技术大学软件学院 中国科学技术大学软件学院 School of Software Engineering,University of Science and Technology of China School of Software Engineering,University of Science and Technology of China 中国科学技术大学苏州研究院嵌入式系统实验室 中国科学技术大学苏州研究院嵌入式系统实验室 Embedded Systems Laboratory,University of Science and Technology of China Embedded Systems Laboratory,University of Science and Technology of China 广西大学计算机与电子信息学院 广西大学计算机与电子信息学院 School of Computer and Electronic Information,Guangxi University School of Computer and Electronic Information,Guangxi University 现有的图像拷贝检测方法中多数对类似噪声的图像失真具有较强的鲁棒性,而对几何类失真则比较脆弱.邹复好等人提出的基于圆环分区的顺序测度拷贝检测方法,在抵抗旋转和等比缩放失真方面性能良好,但是对于拉伸以及在旋转、缩放的同时进行保持图像中心不变的适当裁剪的混合攻击的性能不太好,这主要是由于用于划分圆环的圆形区域无法在这些攻击之后再现.因而本文提出了用于拷贝检测的鲁棒特征提取方法,通过自适应地选择几何不变的圆形区域,再将该圆形区域划分为多个圆环,并计算其特征的顺序测度作为图像特征向量,以增强Zou方法抗几何攻击的鲁棒性.实验结果表明,在抵抗旋拉伸以及在旋转、缩放的同时进行保持图像中心不变的适当裁剪的混合攻击等失真方面,该方法均好于邹复好的方法. Most of current image copy detection methods can resist to the noise-like distortion,but they are quite fragile to geometric distortion,such as rotation,shift,translate,scale,cropping and so on.Zou et al.proposed a novel image copy detection scheme which combines cirque division strategy with ordinal measure method to extract compact image feature,which have good robustness against rotation and scaling.However,Zou’s method can not resist to common distortions,such as aspect ratio change,rotation scaling with cropping,because the circular region divided into rings depends on the image size and is unstable.To conquer the weakness in Zou’s method,a robust feature extraction scheme is proposed.A robust circular region is firstly adaptively constructed and divided to concentric rings,then ordinal measure of rings is computed as image feature vector in order to improve the robustness.The experimental results show the proposed method is better than that of Zou at the aspect of aspect ratio change,rotation scaling with cropping. 顺序测度 拷贝检测 几何失真 ordinal measure copy detection geometric distortion 10.14188/j.1671-8836.2013.01.017 TP391.41 江苏省产学研前瞻性联合研究项目（BY2009128）;中国科学技术大学软件学院种子基金项目（DG2260020003） 2013-01-01 2021-04-01 1 59