基于权重球面谐波框架光照的图像篡改检测

Image forensic technique using the lighting model of weighted spherical harmonic frames

建立了一种基于权重球面谐波框架的光照模型,该模型可以对二维信息进行鲁棒的复杂光照信息提取;利用权重球面谐波框架光照模型对二维数据进行分析,提出了一种新的利用冗余光照特征对图像进行鉴别的技术.实验结果表明:该技术具有鲁棒性和自然调制性,与基于球面谐波基的光照模型相比,不论是合成数据,还是实际的真实图像,无论在光照一致性分析还是光照区分上,该技术都显示出明显优势.把该技术应用到篡改案例时,同样取得了较好的结果.

A lighting model of weighted spherical harmonic frames was constructed to detect the com-plex lighting information from the 2D occluding contours.Using the lighting model on 2D data,a no-vel image forensic technology was presented to identify tampering features.The experiments reveal the advantages of our technology,the robust property of frames and the signal modulation obeyed with natural lighting statistical feature.Compared with the approach using spherical harmonic basis, our method shows advantages in synthetic data and real data.The better results are also achieved when this technique is applied to tempered cases.