An Effective Image Copy-Move Forgery Detection Using Entropy Information
This work addresses a specific challenge in image forensics for detecting forgeries, but it is incremental as it builds on existing Scale Invariant Feature Transform methods.
The paper tackled the problem of copy-move forgery detection in images, particularly in smooth areas where existing keypoint-based methods fail to generate sufficient matches, by introducing entropy images and an overlapped entropy level clustering algorithm, resulting in improved performance and time efficiency.
Image forensics has become increasingly crucial in our daily lives. Among various types of forgeries, copy-move forgery detection has received considerable attention within the academic community. Keypoint-based algorithms, particularly those based on Scale Invariant Feature Transform, have achieved promising outcomes. However, most of keypoint detection algorithms failed to generate sufficient matches when tampered patches were occurred in smooth areas, leading to insufficient matches. Therefore, this paper introduces entropy images to determine the coordinates and scales of keypoints based on Scale Invariant Feature Transform detector, which make the pre-processing more suitable for solving the above problems. Furthermore, an overlapped entropy level clustering algorithm is developed to mitigate the increased matching complexity caused by the non-ideal distribution of gray values in keypoints. Experimental results demonstrate that our algorithm achieves a good balance between performance and time efficiency.