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:
geom: `ctapipe.instrument.CameraGeometry`

Camera geometry information

image: array

pixel values

arrival_times: array

pixel timing information

picture_threshold: float or array

threshold above which all pixels are retained

boundary_threshold: float or array

threshold above which pixels are retained if they have a neighbor already above the picture_thresh

time_limit_core: int or float

arrival time limit of core pixels w.r.t the average time

time_limit_boundary: int or float

arrival time limit of boundary pixels w.r.t neighboring core pixels

min_number_neighbors: int

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.