| { |
| "version": "1.1.0", |
| "updated": "2026-05-15T05:34:28.466141+00:00", |
| "frames_jpg": { |
| "total_frames": 10760, |
| "face_blur_method": "MediaPipe long-range face detector + GaussianBlur(99x99, sigma=30) + 20% padding", |
| "face_detection_threshold": 0.3, |
| "frames_with_faces": 518, |
| "faces_blurred": 519, |
| "face_detection_rate": "4.81%", |
| "text_blur_method": "EasyOCR (English + Hindi/Devanagari) + GaussianBlur(51x51) + 8px padding", |
| "text_blur_threshold": 0.2, |
| "frames_with_text_blur": 10616, |
| "sensitive_text_regions_blurred": 12573, |
| "overlay_band_regions_blurred": 10229, |
| "overlay_band_definition": "top 80px and bottom 80px of every frame; ALL detected text in these bands is blurred", |
| "sensitive_patterns": [ |
| "Brand: SAIL, BSL, Steel Authority", |
| "Location: Bokaro, Jharkhand, India(n), Hindi/Devanagari script", |
| "Other Indian steel plants: IISCO, Durgapur, Bhilai, Rourkela, Jamshedpur", |
| "Area cues: Go Down (any spelling)", |
| "CCTV timestamp formats (DD/MM/YYYY, HH:MM:SS, etc.)", |
| "Camera ID patterns (CAM/CH/Camera + digits)" |
| ], |
| "elapsed_sec": 3932.2 |
| }, |
| "sample_mp4s": { |
| "total_mp4s": 50, |
| "total_frames_processed": 13714, |
| "face_blurs": 19306, |
| "sensitive_text_blurs": 3347, |
| "overlay_band_blurs": 2363, |
| "audio": "stripped (no audio track in re-encoded mp4s)", |
| "ocr_every_n_frames": 5, |
| "elapsed_sec": 1827.4 |
| }, |
| "metadata_scrubs": { |
| "annotations_text_scrubbed": "6 annotations had 'Go Down' references in scene_description; replaced with 'Warehouse South Side'", |
| "manifest_rows_renamed": "224 batch_manifest.csv rows had work_area='Go Down South Side' renamed to 'Warehouse South Side'", |
| "camera_zones_rows_renamed": "1 row in camera_zones.csv had work_area renamed", |
| "sail_railcar_id_removed": "1 annotation (clip_Tippler_1&2_WT2-LOAD_SIDE_20251126_000045_0003) had visible_equipment SAIL railcar number removed", |
| "clip_ids_unchanged": "97 clip_ids containing 'Go_Down' were intentionally NOT renamed to preserve reproducibility against eval result files; the on-pixel pass blurs the visible signage" |
| }, |
| "limitations": [ |
| "OCR recall is bounded; small or low-contrast text (especially partially occluded signage) may be missed", |
| "Frames where Hindi script is mixed with English (Hinglish) may have partial detection", |
| "MediaPipe face detection is bounded; faces <20px or non-frontal may not be blurred", |
| "The 50 sample mp4s were re-anonymized at a 1-in-5 frame OCR cadence (face blur runs on every frame); sub-second signage flashes may persist" |
| ] |
| } |
