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.

ObservationSim/Instrument/Chip/ChipUtils.py

@@ -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]