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Geometric hull calculator for 2D point sets supporting convex hull, concave hull (concave-hull, alphashape), and minimum bounding rectangle. Use when working with pywayne.cv.geometric_hull_calculator module to compute geometric hulls, visualize results with OpenCV or matplotlib, and generate random test point sets.
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| name | pywayne-cv-geometric-hull-calculator |
| description | Geometric hull calculator for 2D point sets supporting convex hull, concave hull (concave-hull, alphashape), and minimum bounding rectangle. Use when working with pywayne.cv.geometric_hull_calculator module to compute geometric hulls, visualize results with OpenCV or matplotlib, and generate random test point sets. |
This module computes geometric hulls (convex and concave) for 2D point sets.
from pywayne.cv.geometric_hull_calculator import GeometricHullCalculator
import numpy as np
# Create calculator with random points
points = GeometricHullCalculator.generate_random_points(num_points=50)
calculator = GeometricHullCalculator(points, algorithm='concave-hull')
# Get results
print(f"MBR: {calculator.get_mbr()}")
print(f"Convex Hull: {calculator.get_convex_hull()}")
print(f"Concave Hull: {calculator.get_concave_hull()}")
# Visualize with matplotlib
calculator.visualize_matplotlib()
# algorithm options: 'concave-hull' or 'alphashape'
# use_filtered_pts: Enable point filtering based on radius
calculator = GeometricHullCalculator(
points=your_points,
algorithm='alphashape',
use_filtered_pts=True
)
| Algorithm | Description |
|---|---|
concave-hull | Concave hull using concave_hull library |
alphashape | Concave hull using alphashape library |
| Type | Method | Description |
|---|---|---|
| Convex Hull | get_convex_hull() | Outer hull containing all points |
| Concave Hull | get_concave_hull() | Inner concave boundary |
| Property | Description |
|---|---|
points | Input 2D points (N×2 numpy array) |
algorithm | Algorithm used for concave hull |
use_filtered_pts | Whether filtered points were used |
box | Minimum Bounding Rectangle corners |
center | Center point of input points |
filter_radius | Radius used for point filtering |
concave_hull_result | Concave hull points or polygons |
calculator.visualize_opencv()
Displays: All input points, MBR, center, filter circle (if enabled), concave hull (green), convex hull (red).
calculator.visualize_matplotlib()
Displays: All input points (red), MBR (blue), center, filter radius circle (if enabled), concave hull (orange), convex hull (purple).
numpy - Array operationscv2 (OpenCV) - For OpenCV visualization and MBR computationmatplotlib - For matplotlib visualizationscipy - For convex hull computationconcave_hull - Concave hull algorithmalphashape - Alphashape algorithmshapely - Polygon operations for area calculation