time_constrained_clean#
- ctapipe.image.cleaning.time_constrained_clean(geom, image, arrival_times, picture_thresh=7, boundary_thresh=5, time_limit_core=4.5, time_limit_boundary=1.5, min_number_picture_neighbors=1)[source]#
Time constrained cleaning by MAGIC
Cleaning contains the following steps: - Find core pixels (containing more photons than a picture threshold) - Remove pixels with less than N neighbors - Keep core pixels whose arrival times are within a time limit of the average time - Find boundary pixels (containing more photons than a boundary threshold) - Remove pixels with less than N neighbors arriving within a given timeframe
- Parameters:
- geomctapipe.instrument.CameraGeometry
Camera geometry information
- imagenp.ndarray
pixel charges
- arrival_timesnp.ndarray
pixel timing information
- picture_thresholdfloat | np.ndarray
threshold above which all pixels are retained
- boundary_thresholdfloat | np.ndarray
threshold above which pixels are retained if they have a neighbor already above the picture_thresh
- time_limit_coreint | float
arrival time limit of core pixels w.r.t the average time
- time_limit_boundaryint | float
arrival time limit of boundary pixels w.r.t neighboring core pixels
- min_number_neighborsint
Threshold to determine if a pixel survives cleaning steps. These steps include checks of neighbor arrival time and value
- Returns:
- A boolean mask of clean pixels.