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| """ | |
| Constants for geometric computation module. | |
| This module contains thresholds and parameters used in finger axis | |
| estimation and ring zone localization. | |
| """ | |
| # ============================================================================= | |
| # Landmark Quality Validation Constants | |
| # ============================================================================= | |
| # Minimum distance between consecutive landmarks (pixels) | |
| # Less than this suggests collapsed/invalid landmarks | |
| MIN_LANDMARK_SPACING_PX = 5.0 | |
| # Minimum total finger length from MCP to TIP (pixels) | |
| # Entire finger less than this suggests invalid detection | |
| MIN_FINGER_LENGTH_PX = 20.0 | |
| # ============================================================================= | |
| # Finger Axis Estimation Constants | |
| # ============================================================================= | |
| # Epsilon for avoiding division by zero in normalization | |
| EPSILON = 1e-8 | |
| # Minimum number of mask points required for PCA | |
| MIN_MASK_POINTS_FOR_PCA = 10 | |
| # Sample distance factor for endpoint thickness heuristic | |
| # Used when determining palm vs tip end without landmarks | |
| ENDPOINT_SAMPLE_DISTANCE_FACTOR = 0.1 # 10% of finger length | |
| # ============================================================================= | |
| # Ring Zone Localization Constants | |
| # ============================================================================= | |
| # Default ring zone position as percentage of finger length from palm | |
| DEFAULT_ZONE_START_PCT = 0.15 # 15% from palm end | |
| DEFAULT_ZONE_END_PCT = 0.25 # 25% from palm end | |
| # Anatomical zone width factor (for anatomical localization mode) | |
| # Zone width = MCP-PIP distance * this factor | |
| ANATOMICAL_ZONE_WIDTH_FACTOR = 0.5 # 50% of MCP-PIP segment (25% each side) | |
| # ============================================================================= | |
| # Line-Contour Intersection Constants | |
| # ============================================================================= | |
| # Minimum determinant value to detect parallel lines | |
| MIN_DETERMINANT_FOR_INTERSECTION = 1e-8 | |