Commit d1bf1786 authored by Fang Yuedong's avatar Fang Yuedong
Browse files

remove the read noise terms (first add to then minus from base image) from... 

remove the read noise terms (first add to then minus from base image) from possion noise generation.
parent b6277b5d

ObservationSim/Instrument/Chip/ChipUtils.py

+5 −4
Original line number Diff line number Diff line
@@ -156,7 +156,8 @@ def get_poisson(seed=0, sky_level=0.): 
    return rng_poisson, poisson_noise



def get_base_img(img, read_noise, readout_time, dark_noise, exptime=150.):

    base_level = read_noise**2 + dark_noise*(exptime+0.5*readout_time)

    # base_level = read_noise**2 + dark_noise*(exptime+0.5*readout_time)

    base_level = dark_noise*(exptime+0.5*readout_time)

    base_img = base_level * np.ones_like(img.array)

    return base_img
@@ -169,17 +170,17 @@ def add_poisson(img, chip, exptime=150., seed=0, sky_level=0., poisson_noise=Non 
    base_img = get_base_img(img=img, read_noise=read_noise, readout_time=chip.readout_time, dark_noise=dark_noise, exptime=exptime)

    img += base_img

    img.addNoise(poisson_noise)

    img -= read_noise**2

    # img -= read_noise**2

    return img, base_img



def add_brighter_fatter(img):

    #Inital dynamic lib

    try:

        with pkg_resources.files('ObservationSim.Instrument.Chip.libBF').joinpath("libmoduleBF.so") as lib_path:

        with pkg_resources.files('ObservationSim.Instrument.Chip.lib_bf').joinpath("libmoduleBF.so") as lib_path:

            print('--1', lib_path)

            lib_bf = ctypes.CDLL(lib_path)

    except AttributeError:

        with pkg_resources.path('ObservationSim.Instrument.Chip.libBF', "libmoduleBF.so") as lib_path:

        with pkg_resources.path('ObservationSim.Instrument.Chip.lib_bf', "libmoduleBF.so") as lib_path:

            lib_bf = ctypes.CDLL(lib_path)

    lib_bf.addEffects.argtypes = [ctypes.c_int, ctypes.c_int, ctypes.POINTER(ctypes.c_float), ctypes.POINTER(ctypes.c_float), ctypes.c_int]