ImageModifier

class ctapipe.image.modifications.ImageModifier(**kwargs: Any)

Bases: TelescopeComponent

Component to tune simulated background to overserved NSB values. A differentiation between bright and dim pixels is taking place because this happens at DL1a level and in general the integration window would change for peak-searching extraction algorithms with different background levels introducing a bias to the charge in dim pixels.

The performed steps include: - Smearing of the image (simulating a worse PSF) - Adding poissonian noise (different for bright and dim pixels) - Adding a bias to dim pixel charges (see above)

Attributes Summary

noise_bias_dim_pixels	extra bias to add in dim pixels.
noise_correct_bias	If True subtract the expected noise from the image.
noise_level_bright_pixels	expected extra noise in bright pixels.
noise_level_dim_pixels	expected extra noise in dim pixels.
noise_transition_charge	separation between dim and bright pixels.
psf_smear_factor	Fraction of light to move to each neighbor.
rng_seed	Seed for the random number generator

Methods Summary

__call__(tel_id, image[, rng])

Call self as a function.

Attributes Documentation

noise_bias_dim_pixels

extra bias to add in dim pixels.

noise_correct_bias

If True subtract the expected noise from the image.

noise_level_bright_pixels

expected extra noise in bright pixels.

noise_level_dim_pixels

expected extra noise in dim pixels.

noise_transition_charge

separation between dim and bright pixels.

psf_smear_factor

Fraction of light to move to each neighbor.

rng_seed

Seed for the random number generator

Methods Documentation

__call__(tel_id, image, rng=None)

Call self as a function.