基于光照方向不一致的图像盲取证技术

Exposing Digital Image Forgeries by Detecting Inconsistence in Light Source Direction

通过提取单一数字图像中目标物体的边缘信息,可估计图像拍摄场景中的光照方向.为了提高光照方向的估计效率,引入图像边缘检测算子,实现了待取证图像中目标物体的准确定位和边缘拟合,并进行了数据分析,建立了系统的基于光照方向不一致的图像篡改检测流程.实验结果表明,边缘检测算子优化了图像检测流程,提高了该取证技术的可行性和可扩展性.

By extracting the edge information of the target object in single digital image, the light direction can be estimated. In order to improve the efficiency of the estimated light direction, the image edge detection operators are brought in which achieves the accurate orientation of the target object in the fake image. With the combination of border fitting and data analysis, thus a procedure of detecting image tampering whieh is based on the inconsistencies in light source direction is formed. Experimental results show that edge detection operators optimize the detecting process, also improve the feasibility and expandability of this forensic technology.