摘要
图像篡改破坏了自然图像的光照一致性,为了保证图像内容的安全性,提出一种基于光照方向一致性的图像盲鉴别方法鉴别图像真伪。该方法根据图像的实际强度与计算强度间的误差函数以及适合不同光源模式的约束条件,估计不同光源模式下图像的光照方向。通过分析图像中不同对象或对象与背景之间的光照方向是否一致,判断图像是否被篡改。实验结果表明,无限光源模式的数字图像盲鉴别方法的正确检测率可达到81.8%,从而证明了局部光源和复合光源模式的数字图像盲鉴别方法的有效性。
Image tampering will destroy the light coherence of natural images. In order to ensure the security of image content, this paper presents a blind identification method based on the consistency of illuminant direction to identify the image authenticity. In accordance with the error function between the measured intensity and calculated intensity, and the regularization terms for different source models, this method estimates the illuminant direction for images of different source models. Analyzing if the illumination directions between different objects and background in one image are consistent to determine whether the image has been tampered with. Experimental results show that the correct detection rates for blind identification technology for digital images based on infinite light source model has reached up to 81.8%. In addition, experiments also show the effectiveness of blind identification base on local light source and composite light sources.
出处
《吉林大学学报（信息科学版）》
CAS
2009年第3期293-298,共6页
Journal of Jilin University（Information Science Edition）
基金
吉林省科技发展计划基金资助项目(20050503)
关键词
图像篡改
光照方向
盲鉴别
图像真实性
image tampering
illuminant direction
blind identification
image authenticity
