Author

Wen-Zhong Tang

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#computer vision Preprint Oct 2026

Lost in Contrast: Instruction-Preserving Decoding for Reliable Visual Question Answering

Visual contrastive decoding corrects answers using the prediction difference between the original image and a reference condition, yet the same contrast also turns supported abstentions into incorrect answers. We find that abstentions are lost at two stages: contrastive decoding with candidate filtering can exclude the...

Hao-Nan Zhang, Ting Jin, Wen-Zhong Tang et al. · 0 citations

Open access Oct 2026

Image Manipulation Detection via Multiscale Region and Cross-Image Edge Contrastive Learning

Pixel-level image manipulation localization requires separating weak forensic traces from image content while recovering manipulated regions under post-processing and domain shift. Existing methods do not jointly impose structured discrimination on multiscale region features and edge features drawn from different image...

Xiao-Yi Zhou, Wen-Zhong Tang, Jin-Yu Zhang et al. · Journal of Imaging · 0 citations