项目名称: 基于成像环境约束的低质量图像篡改取证研究
项目编号: No.61502496
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 自动化技术、计算机技术
项目作者: 王伟
作者单位: 中国科学院自动化研究所
项目金额: 20万元
中文摘要: 本项目以对低质量图像的篡改取证研究为突破口,研究基于成像环境约束的图像篡改取证算法。 低质量图像使得传统的能够反映篡改行为的统计特征基本失效。因此,本项目从对成像环境的研究入手,充分利用辅助信息,恢复图像的部分成像信息(包括物体三维信息和相机拍摄参数等);在此前提下,研究更为准确的光照(影)一致性约束、几何关系约束、度量合理性约束等多种取证方法,同时针对多线索取证结果间的相互矛盾和相互兼容问题,研究决策融合方法,以期解决图像取证研究中的鲁棒性和准确性问题,推动篡改取证技术走向实际应用。从单幅图像恢复三维信息是个病态问题,本课题通过Kinect设备采集物体三维数据库,构建三维物体的统计约束条件,利用三维形变模型,从而较准确地重构图中物体的三维信息。此外,本课题中还将考虑取证研究中另一个重要问题,取证线索表达的精度问题。
中文关键词: 数字图像盲取证;成像环境约束;决策融合;辅助信息;体感交互设备
英文摘要: In this project, we try to improve the robustness and accuracy of image tampering forensics method. We mainly focus on forensics of low quality images. We propose to explore the constrains of scene and imaging condition, because the traditional statistical features are almost failed for these images. Based on the auxiliary information or priori knowledge, some 3D information and camera parameters can be restored. Thus, the constraints, such as lighting or shadow directions consistency, geometric constraints of some known points, and object size, should be expressed more accurately with the help of the restored information. Though 3D reconstruction from a single image is an ill-defined problem, by regulating with 3D object data collected by Kinect, we can reconstruct the 3D information from the image with a morphable model. To make the image forensics more practical in terms of robustness and accuracy, we try to solve the contradiction and compatibility problems of multi forensics clues by a decision fusion method. Besides, we also consider the problem caused by the measurement precision of forensics clue.
英文关键词: Image Forensics;Constraint of Imaging Environment;Desicion Fusion;Auxiliary Information ;Kinect