投影与光照方向一致性的图像篡改检测  

Image Tampering Detection by Consistency of Projection and Lighting Direction

作　　者：牛少彰[1] 黄艳丽[1] 孙晓婷[2] 

机构地区：[1]北京邮电大学智能通信软件与多媒体北京市重点实验室,北京100876 [2]北京邮电大学理学院,北京100876

出　　处：《北京邮电大学学报》2014年第5期61-65,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61070207;61370195);北京市自然科学基金项目(4132060);"十二五"国家密码发展基金密码理论课题项目(MMJJ201201002)

摘　　要：针对在自然光照条件下拍摄的图像遭到篡改的情况,提出了一种新的篡改检测方法.光照射到物体上在物体表面会发生漫反射现象,同时会在投影平面上产生阴影,一旦图像遭到篡改很难保持这些自然特征的一致性.因此,根据物体表面估计出的光照方向与投射阴影得到的光源区域的一致性,不仅可以检测有多个物体的篡改图像,还可以检测出只有1个物体的图像是否被篡改.A new forgery detection scheme is proposed in case of modification of images formed naturally. Illuminating an object leads to make diffuse refection on surface of the object, its shadow appears in the projection plane. Once images are tampered, it is difficult to maintain the consistency of these natural features. Therefore, the uniformity between the direction of light estimated with an object in a photo- graphic and the area of the light direction on the basis of cast shadow, will not effectively work for a de- tected image of multiple objects, but determine if an image with only one is tampered or not.

关 键 词：光照方向 朗伯模型 投射阴影 篡改检测 

分 类 号：TN911.73[电子电信—通信与信息系统]