vato007/breezyslam
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Begin supporting scan angles argument to Scan.update()

Browse Source
This commit is contained in:
simondlevy
2018-07-04 14:26:55 -04:00
parent 2811620c6d
commit 5c3b00ec9c
3 changed files with 74 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
python/breezyslam/algorithms.py
View File

@@ -87,29 +87,30 @@ class CoreSLAM(object):
# Initialize the map
self.map = pybreezyslam.Map(map_size_pixels, map_size_meters)
def update(self, scans_mm, poseChange, should_update_map=True):
def update(self, scans_mm, pose_change, scan_angles_degrees=None, should_update_map=True):
'''
Updates the scan and odometry, and calls the the implementing class's _updateMapAndPointcloud method with
the specified pose change.
scan_mm is a list of Lidar scan values, whose count is specified in the scan_size
attribute of the Laser object passed to the CoreSlam constructor
poseChange is a tuple (dxy_mm, dtheta_degrees, dt_seconds) computed from odometry
pose_change is a tuple (dxy_mm, dtheta_degrees, dt_seconds) computed from odometry
scan_angles_degrees is an optional list of angles corresponding to the distances in scans_mm
should_update_map flags for whether you want to update the map
'''
# Convert pose change (dxy,dtheta,dt) to velocities (dxy/dt, dtheta/dt) for scan update
velocity_factor = (1 / poseChange[2]) if (poseChange[2] > 0) else 0 # units => units/sec
dxy_mm_dt = poseChange[0] * velocity_factor
dtheta_degrees_dt = poseChange[1] * velocity_factor
velocity_factor = (1 / pose_change[2]) if (pose_change[2] > 0) else 0 # units => units/sec
dxy_mm_dt = pose_change[0] * velocity_factor
dtheta_degrees_dt = pose_change[1] * velocity_factor
velocities = (dxy_mm_dt, dtheta_degrees_dt)
# Build a scan for computing distance to map, and one for updating map
self._scan_update(self.scan_for_mapbuild, scans_mm, velocities)
self._scan_update(self.scan_for_distance, scans_mm, velocities)
self._scan_update(self.scan_for_mapbuild, scans_mm, velocities, scan_angles_degrees)
self._scan_update(self.scan_for_distance, scans_mm, velocities, scan_angles_degrees)
# Implementing class updates map and pointcloud
self._updateMapAndPointcloud(poseChange[0], poseChange[1], should_update_map)
self._updateMapAndPointcloud(pose_change[0], pose_change[1], should_update_map)
def getmap(self, mapbytes):
'''
@@ -136,9 +137,10 @@ class CoreSLAM(object):
return self.__str__()
def _scan_update(self, scan, lidar, velocities):
def _scan_update(self, scan, lidar, velocities, scan_angles_degrees):
scan.update(scans_mm=lidar, hole_width_mm=self.hole_width_mm, velocities=velocities)
scan.update(scans_mm=lidar, hole_width_mm=self.hole_width_mm,
velocities=velocities, scan_angles_degrees=scan_angles_degrees)
# SinglePositionSLAM class ---------------------------------------------------------------------------------------------
@@ -251,13 +253,13 @@ class RMHC_SLAM(SinglePositionSLAM):
self.sigma_theta_degrees = sigma_theta_degrees
self.max_search_iter = max_search_iter
def update(self, scan_mm, angles_degrees=None, poseChange=None, should_update_map=True):
def update(self, scans_mm, pose_change=None, scan_angles_degrees=None, should_update_map=True):
if not poseChange:
if not pose_change:
poseChange = (0, 0, 0)
pose_change = (0, 0, 0)
CoreSLAM.update(self, scan_mm, poseChange, should_update_map)
CoreSLAM.update(self, scans_mm, pose_change, scan_angles_degrees, should_update_map)
def _getNewPosition(self, start_position):
'''

41
python/pybreezyslam.c
View File

@@ -268,13 +268,15 @@ Scan_update(Scan *self, PyObject *args, PyObject *kwds)
PyObject * py_lidar = NULL;
double hole_width_mm = 0;
PyObject * py_velocities = NULL;
PyObject * py_scan_angles_degrees = NULL;
static char* argnames[] = {"scans_mm", "hole_width_mm", "velocities", NULL};
static char* argnames[] = {"scans_mm", "hole_width_mm", "velocities", "scan_angles_degrees", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwds,"Od|O", argnames,
if (!PyArg_ParseTupleAndKeywords(args, kwds,"Od|OO", argnames,
&py_lidar,
&hole_width_mm,
&py_velocities))
&py_velocities,
&py_scan_angles_degrees))
{
return null_on_raise_argument_exception("Scan", "update");
}
@@ -286,13 +288,31 @@ Scan_update(Scan *self, PyObject *args, PyObject *kwds)
"lidar must be a list");
}
// Bozo filter on LIDAR argument list size
if (PyList_Size(py_lidar) != self->scan.size)
// Scan angles provided; run bozo-filter to match against lidar-list size
if (py_scan_angles_degrees != Py_None)
{
// Bozo filter on SCAN_ANGLES_DEGREES argument
if (!PyList_Check(py_scan_angles_degrees))
{
return null_on_raise_argument_exception_with_details("Scan", "update",
"scan angles must be a list");
}
if (PyList_Size(py_lidar) != PyList_Size(py_scan_angles_degrees))
{
return null_on_raise_argument_exception_with_details("Scan", "update",
"number of scan angles must equal number of scan distances");
}
}
// No scan angles provided; lidar-list size must match scan size
else if (PyList_Size(py_lidar) != self->scan.size)
{
return null_on_raise_argument_exception_with_details("Scan", "update",
"lidar size mismatch");
}
// Default to no velocities
double dxy_mm = 0;
double dtheta_degrees = 0;
@@ -315,7 +335,6 @@ Scan_update(Scan *self, PyObject *args, PyObject *kwds)
}
}
// Extract LIDAR values from argument
int k = 0;
for (k=0; k<self->scan.size; ++k)
@@ -348,20 +367,20 @@ static PyMethodDef Scan_methods[] =
};
#define TP_DOC_SCAN \
"A class for Lidar scans.\n" \
"A class for Lidar scans.\n" \
"Scan.__init__(laser, span=1)\n"\
"laser is a Laser object containing parameters of your laser rangefinder (Lidar)\n"\
"laser is a Laser object containing parameters of your laser rangefinder (Lidar)\n"\
" span supports spanning laser scan to cover the space better"
static PyTypeObject pybreezyslam_ScanType =
{
#if PY_MAJOR_VERSION < 3
#if PY_MAJOR_VERSION < 3
PyObject_HEAD_INIT(NULL)
0, // ob_size
#else
#else
PyVarObject_HEAD_INIT(NULL, 0)
#endif
#endif
"pybreezyslam.Scan", // tp_name
sizeof(Scan), // tp_basicsize
0, // tp_itemsize