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Skip GSD and size filtering without altitude

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Roman Meshko
2026-04-19 21:50:48 +03:00
parent 7d897df380
commit 5cfcdb5fd5
9 changed files with 54 additions and 11 deletions
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_docs/00_problem/acceptance_criteria.md
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- Detections with confidence below `probability_threshold` (default: 0.25) are filtered out.
- Overlapping detections with containment ratio > `tracking_intersection_threshold` (default: 0.6) are deduplicated, keeping the higher-confidence detection.
- Tile duplicate detections are identified when all bounding box coordinates differ by less than 0.01 (TILE_DUPLICATE_CONFIDENCE_THRESHOLD).
- Physical size filtering: detections exceeding `max_object_size_meters` for their class (defined in classes.json, range 2–20 meters) are removed.
- Physical size filtering: detections exceeding `max_object_size_meters` for their class (defined in classes.json, range 2–20 meters) are removed when ground sampling distance can be computed from camera settings.
## Video Processing
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- Images ≤ 1.5× model dimensions (1280×1280): processed as single frame.
- Larger images: tiled based on ground sampling distance. Tile physical size: 25 meters (METERS_IN_TILE). Tile overlap: `big_image_tile_overlap_percent` (default: 20%).
- GSD calculation: `sensor_width * altitude / (focal_length * image_width)`.
- GSD calculation: `sensor_width * altitude / (focal_length * image_width)` when `altitude` is provided.
## API
_docs/00_problem/input_data/data_parameters.md
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| tracking_intersection_threshold | float | 0.6 | Overlap ratio for NMS deduplication |
| model_batch_size | int | 8 | Inference batch size |
| big_image_tile_overlap_percent | int | 20 | Tile overlap for large images (0-100%) |
| altitude | float | 400 | Camera altitude in meters |
| altitude | float | optional | Camera altitude in meters. When omitted, GSD-based size filtering and image tiling are skipped. |
| focal_length | float | 24 | Camera focal length in mm |
| sensor_width | float | 23.5 | Camera sensor width in mm |