摘要
针对经过拼接合成等篡改操作的图像被压缩后,难以检测出篡改证据的问题,提出了一种基于摄像机标定的压缩图像拼接合成检测方法。该方法首先分析压缩图像的成像规律,将空间变换矩阵作为检测证据;然后基于摄像机标定参数,估计单应矩阵;最后基于摄像机外部参数,通过旋转图像的空间变换矩阵,确定图像的真实性,完成拼接合成压缩图像的检测。实验结果证明,该方法可以检测出经过拼接合成篡改的图像,检测精度为75%。
It is difficult to detect the tampering evidence after the images with tampering operations such as splicing and synthesis are compressed.In order to achieve tamper detection of compressed images,a compressed image stitching and synthesis detection method based on camera calibration is proposed.The imaging law of compressed image is analyzed,and the spatial transformation matrix is used as the detection evidence.Based on the camera calibration parameters,the homography matrix is estimated.Based on the external parameters of the camera,the authenticity of the image is determined by rotating the spatial transformation matrix of the image,and the detection of stitched synthetic compressed image is completed.The experimental results demonstrate that this method can detect images that have been spliced,synthesized,and tampered with,with a detection accuracy of 75%.
作者
侯贵松
HOU Guisong(Institute of Quantitative&Technological Economics,Chinese Academy of Social Sciences,Beijing 100732,China)
出处
《吉林大学学报（信息科学版）》
CAS
2023年第3期403-409,共7页
Journal of Jilin University（Information Science Edition）
基金
河北省重点研发计划基金资助项目(20313701D)。
关键词
数字取证
压缩图像
相机标定
空间旋转矩阵
digital forensics
compressed images
camera calibration
spatial rotation matrix
