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Cartographer Pose Graph
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#!/usr/bin/env python3 | |
# sudo apt-get install protobuf-compiler | |
# roscd cartographer && mkdir py_export | |
# protoc --python_out ./py_export -I . `find . -iname '*.proto'` | |
import struct | |
import gzip | |
import cartographer.mapping | |
import cartographer.mapping.proto.sparse_pose_graph_pb2 | |
import cartographer.mapping.proto.serialization_pb2 | |
class PoseGraphFile(object): | |
def __init__(self, pose_graph_filename): | |
self.pose_graph_filename = pose_graph_filename | |
self.pose_graph_file = open(pose_graph_filename, 'rb') | |
assert(self.is_valid()) | |
self.sd = cartographer.mapping.proto.serialization_pb2.SerializedData() | |
self.spg = cartographer.mapping.proto.sparse_pose_graph_pb2.SparsePoseGraph() | |
self.read_sparse_pose_graph() | |
self.submaps = {} | |
while self.pose_graph_file: | |
serdata = self.read_serialized_data() | |
if not serdata: | |
break | |
def read_sparse_pose_graph(self): | |
sz = self.read_size() | |
if sz == 0: | |
return None | |
buf = self.pose_graph_file.read(sz) | |
buf = gzip.decompress(buf) | |
self.spg.ParseFromString(buf) | |
def read_serialized_data(self): | |
sz = self.read_size() | |
if sz == 0: | |
return False | |
buf = self.pose_graph_file.read(sz) | |
buf = gzip.decompress(buf) | |
self.sd.ParseFromString(buf) | |
return True | |
def is_valid(self): | |
kMagic = [0x7b, 0x1d, 0x1f, 0x7b, 0x5b, 0xf5, 0x01, 0xdb] | |
self.pose_graph_file.seek(0) | |
magic = self.pose_graph_file.read(8) | |
return all([x == y for x, y in zip(kMagic[::-1], magic)]) | |
def read_size(self): | |
buf = self.pose_graph_file.read(8) | |
if len(buf) < 8: | |
return 0 | |
return struct.unpack_from("<Q", buf)[0] | |
def num_trajectories(self): | |
return len(self.spg.trajectory) | |
def num_submaps(self, trajectory_id=None): | |
if trajectory_id is not None: | |
return len(self.spg.trajectory[trajectory_id].submap) | |
else: | |
return sum(map(lambda x: len(x.submap), self.spg.trajectory)) | |
def num_poses(self, trajectory_id=None): | |
if trajectory_id is not None: | |
return len(self.spg.trajectory[trajectory_id].node) | |
else: | |
return sum(map(lambda x: len(x.node), self.spg.trajectory)) | |
if __name__ == "__main__": | |
parser = argparse.ArgumentParser(description="Process and export live SLAM results") | |
parser.add_argument('pose_graph_filename', type=str) | |
args = parser.parse_args() | |
pg = PoseGraphFile(args.pose_graph_filename) | |
print("Found: ", pg.num_trajectories(), " trajectories") | |
for ii in range(0, pg.num_trajectories()): | |
print(pg.num_submaps(ii), pg.num_poses(ii)) | |
print(pg.num_submaps(), pg.num_poses()) |
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