图片人脸批量戴口罩

Automatically detects faces in images and adds masks using OpenCV DNN deep learning detector. Features multi-scale tiled detection for small/distant faces, intelligent false-positive filtering, front/side face auto-recognition with dual mask templates, enhanced detection mode for crowded classroom/group photos, upward-angle adaptive positioning for selfie/wide-angle photos, manual face coordinate injection for missed detections, model instance reuse for efficient batch processing, and batch processing support.