基于相机指纹/成像传感器模式噪声的图像源辨识算法容易受到指纹复制攻击．文中首先对现有的三角测试反攻击算法进行了简化，即通过将图像各块的衰减因子近似认为是常数，减少了计算时间，然后从传感器模式噪声添加方式、图像内容、模式噪声提取方式和盗用图片数目四个方面对反攻击算法性能进行了详细分析．最后，根据实验结果指出，以上四个方面都会影响反攻击算法的成功率．文中还讨论了这些因素所影响的程度和范围．

Considering the image source identification algorithm based on the camera fingerprint and the imaging sen-sor pattern noise to be easily attacked by fingerprint- copy operation,this paper simplifies the triangle test algorithmwhich is a counter- attack algorithm against the fingerprint- copy operation,that is,the attenuation factor for eachblock is set as a constant,thus reducing calculation time.Then,the performance of the counter- attack algorithm isdiscussed in detail from four aspects,namely,the addition manner of sensor pattern noise,the image content,theway of extracting sensor pattern noise and the number of illegally- used images.Finally,according to the experimentalresults,this paper points out that all the four aspects can affect the success rate of the counter- attack algorithm.Inaddition,the degree and scope of effect caused by the above- mentioned factors are also explored.