convert_geometry_rect2d_back_to_hexe1d¶
-
ctapipe.image.
convert_geometry_rect2d_back_to_hexe1d
(geom, signal, key=None, add_rot=None)[source]¶ reverts the geometry distortion performed by convert_geometry_hexe1d_to_rect_2d back to a hexagonal grid stored in 1D arrays
- Parameters
- geomCameraGeometry
geometry object where pixel positions are stored in a 2D rectangular camera grid
- signalndarray
pixel intensity stored in a 2D rectangular camera grid
- key:
key to retrieve buffered geometry information (see
convert_geometry_hex1d_to_rect2d
)- add_rot:
not used – only here for backwards compatibility
- Returns
- old_geomCameraGeometry
the original geometry of the image
- signalndarray
1D (no timing) or 2D (with timing) array of the pmt signals
Notes
The back-conversion works with an internal buffer to store the transfer map (which was produced in the first conversion). If
key
is not found in said buffer, this function tries to perform a mock conversion. For this, it needs aCameraGeometry
instance of the original camera layout, which it tries to load by name (i.e. thecamera_name
). The function assumes the originalcamera_name
can be inferred from the given, modified one by:geom.camera_name.split('_')[0]
.Examples
camera = subarray.tel[tel_id].camera image = event.r0.tel[tel_id].image[0] key = camera.camera_name square_geom, square_image = convert_geometry_hex1d_to_rect2d(camera, image, key=key) hex_geom, hex_image = convert_geometry_rect2d_back_to_hexe1d(square_geom, square_image, key = key)