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# ROI weighted exposure update face_weight = 0.8 scene_weight = 1.0 - face_weight target_luma = 120 face_luma = measure_luma(face_roi) scene_luma = measure_luma(full_frame) combined = face_weight*face_luma + scene_weight*scene_luma exposure *= (target_luma / (combined + 1e-6)) clamp_exposure() If you want this turned into a formatted PDF, a full bibliography, or experimental code and datasets, say which output you need and I will produce it.