def fit_object_model(model_cloud, object_cloud):
# generate the model kdtree
mark = time()
object_tree = scipy.spatial.KDTree(object_cloud)
logger.info('generated object tree in {:.3f}s'.format(time() - mark))
# align the object cloud with ICP
mark = time()
diff_xform = icp.match(model_cloud[::100], object_tree, iterations=50, initial_threshold=0.10)
model_cloud_aligned = model_cloud.dot(diff_xform[0].T) + diff_xform[1]
logger.info('aligned model cloud in {:.3f}s'.format(time() - mark))
return diff_xform, model_cloud_aligned
def shelf_subtract(shelf_cloud, camera_cloud, shelf_model, bounds, downsample=100):
# generate the shelf kdtree
mark = time()
shelf_tree = scipy.spatial.KDTree(shelf_cloud)
logger.info('generated shelf tree in {:.3f}s'.format(time() - mark))
# align the camera cloud with ICP
mark = time()
diff_xform = icp.match(camera_cloud[::downsample], shelf_tree, initial_threshold=0.05)
camera_cloud_aligned = camera_cloud.dot(diff_xform[0].T) + diff_xform[1]
logger.info('aligned camera cloud in {:.3f}s'.format(time() - mark))
# remove all points near the shelf
mark = time()
# _, ind = shelf_tree.query(camera_cloud_aligned, distance_upper_bound=0.005)
# mask = ind >= len(shelf_tree.data)
# segmented_cloud = camera_cloud_aligned[mask]
test_point = GeometricPrimitive()
test_point.setPoint((0, 0, 0))
test_geom = Geometry3D()
test_geom.setGeometricPrimitive(test_point)
def collides(point):
test_geom.setCurrentTransform(so3.identity(), point)
return test_geom.withinDistance(shelf_model.geometry(), 0.01)
mask = map(lambda p: not collides(p), camera_cloud_aligned)
# segmented_cloud = [ p for (i, p) in enumerate(camera_cloud_aligned) if mask[i] ]
camera_cloud_aligned_local = (camera_cloud_aligned - shelf_model.getTransform()[1]).dot(so3.matrix(shelf_model.getTransform()[0]))
mask2 = reduce(numpy.bitwise_and, [ (bounds[0][i] < camera_cloud_aligned_local[:, i]) & (bounds[1][i] > camera_cloud_aligned_local[:, i]) for i in range(3) ])
segmented_cloud = camera_cloud_aligned[mask & mask2]
logger.info('segmented camera cloud in {:.3f}s: {} -> {}'.format(time() - mark, len(camera_cloud_aligned), len(segmented_cloud)))
return diff_xform, camera_cloud_aligned, segmented_cloud, mask & mask2
