colour_table = allskyColour.default(image_histogram, thresholds)
# Apply the colour mappings we have just created
false_colour_image = green_image.applyColourTable(colour_table)
# Apply the absolute calibration to the image. This converts
# the pixel values into Rayleighs. However, it is a lazy
# operation so don't expect the values in the file to be in
# Rayleighs! The calibration is only done when the image is
# plotted. The const_factor argument is used to account for
# transmission through the instrument dome.
print("Calibrating intensities to Rayleighs")
factor = 1.4E-3 # counts per second per Rayleigh
exptime = 20.0 # exposure time in seconds
dome_tansmission = 0.96 # transmission through instrument dome
calibrated_image = false_colour_image.absoluteCalibration(
factor, exptime, const_factor=1.0 / dome_tansmission)
# Plot the image using the allskyPlot module. The returned
# object is a matplotlib figure object - see the matplotlib
# documentation for details of all the things you can do with
# this!
print("Plotting image")
calibrated_image.title = "Example Calibrated Image"
figure = allskyPlot.plot([calibrated_image])
figure.savefig("calibrated_example.png")
print("Done! Calibrated image is stored in calibrated_example.png")
def realtime_keogram(image, output, settings_manager):
# see if a realtime keogram has been created yet
log.info("starting keogram")
try:
filename = settings_manager.get(
['user_rt_keo_name'])['user_rt_keo_name']
except KeyError:
filename = None
image = image.resize((500, 500))
if filename is None or not os.path.exists(filename):
settings_manager.set(
{'output': "OutputTaskHandler> Creating new realtime keogram."})
# work out the start and end times for the keogram based on the setting
# in the settings file
end_time = datetime.datetime.utcnow()
time_span = datetime.timedelta(hours=output.time_range)
start_time = end_time - time_span
keo = allskyKeo.new([image], output.angle, start_time, end_time, strip_width=output.strip_width,
data_spacing=output.data_spacing, keo_fov_angle=output.fov_angle)
try:
keo.save(os.path.expanduser('~') + "/realtime_keogram")
settings_manager.create('user_rt_keo_name', os.path.expanduser(
'~') + "/realtime_keogram", persistant=True)
except ValueError:
# value already exists - just update it to the new value
print("Unexpected error:", sys.exc_info()[0])
settings_manager.set(
{'user_rt_keo_name': os.path.expanduser('~') + "/realtime_keogram"})
else:
log.info("Opening keogram")
try:
keo = allskyKeo.load(filename)
except IOError:
print("Unexpected error:", sys.exc_info()[0])
print(filename)
except:
print("Unexpected error:", sys.exc_info()[0])
settings_manager.set(
{'output': "OutputTaskHandler> Adding image to realtime keogram."})
# check that the image (and output settings) is actually compatible with the current
# keogram - for example if the FOV has changed we don't want the range on the keogram
# to always be out of date.
if check_keo_compatibility(keo, image, output):
keo = keo.roll([image])
try:
keo.save(filename)
except:
print("Unexpected error:", sys.exc_info()[0])
else:
# some of the settings must have changed - time to start a new
# keogram
settings_manager.set(
{'user_rt_keo_name': None, 'output': "OutputTaskHandler> New image is not compatible with existing keogram."})
return realtime_keogram(image, output, settings_manager)
log.info("made keogram")
return allskyPlot.plot([keo], size=(9, 3.7))
sys.exit(0)
if not os.path.isdir(sys.argv[1]):
print "keo_create: \""+sys.argv[1]+"\" is not a directory."
print""
print "Usage: keo_create [DIRECTORY]"
sys.exit(0)
# Import the PASKIL modules needed to create keograms
from PASKIL import allskyData, allskyKeo, allskyPlot
# create a dataset object containing all the images of
# the correct type and wavelength in the specified folder
dataset = allskyData.new(sys.argv[1], IMAGE_WAVELENGTH, IMAGE_FILE_TYPES)
# create a keogram from the dataset
keogram = allskyKeo.new(dataset, ANGLE, strip_width=STRIP_WIDTH,
data_spacing=DATA_SPACING, keo_type=KEO_TYPE,
keo_fov_angle=KEO_FOV_ANGLE)
# save the keogram object so that it can be opened/edited in future
keo_obj_filename = os.path.normpath(sys.argv[1]+"/keogram_object")
keogram.save(keo_obj_filename)
# plot the keogram and save the plot
keo_plot_filename = os.path.normpath(sys.argv[1]+"/keogram_plot.png")
plotted_keo = allskyPlot.plot([keogram])
plotted_keo.savefig(keo_plot_filename)