IFL(Image Forgery Location) helps secure digital media forensics.
However, many methods suffer from false detections(i.e., FPs) and inaccurate boundaries. In this paper, we proposed the CatmullRom Splines-based Regression Network(CSR-Net), which first rethinks the IFL task from the perspective of regression to deal with  this problem.
Specifically speaking, we propose an adaptive CutmullRom splines fitting scheme for coarse localization of the tampered regions. Then, for false positive cases, we first develop a novel re-scoring mechanism, which aims to filter out samples that cannot have responses on both the classification branch and the instance branch; second, to further restrict the boundaries, we design a learnable texture extraction module, which refines and enhances the contour representation by decoupling the horizontal and vertical forgery features to extract a more robust contour representation, thus suppressing FPs.
Compared to segmentation-based methods, our method is simple but effective due to the unnecessity of post-processing. Extensive experiments show the superiority of CSR-Net to existing state-of-the-art methods, not only on standard natural image datasets but also on social media datasets. The code will be publicly available soon.

CatmullRom Splines-Based Regression for Image Forgery Localization

Main Track - Computer Vision

technical paper

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Li Zhang

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CatmullRom Splines-Based Regression for Image Forgery Localization

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