SIGMA: Semantic-Difference Instruction-Grounding Mask Annotator for Text-Driven Image Manipulation Localization. - Peiyu Zhuang; Jianquan Yang; Haodong Li 001; Zhuoying Cai; Ruitao Xie; Jishen Zeng; Baoying Chen; Jiwu Huang; Xiaochun Cao (CoRR, 2026)