Comments (1)
noqsi
commented on September 4, 2024
More details:
Constant: FPE_MAX_ADU (65535).
Parameters from calibration database: video_scale (electrons/adu, ~5.5) and compression_parameter (dimensionless, ~0.01).
Parameter from input image: exposure_count (900 for FFI).
I/O: data_electrons, an array of pixel values and data_ADU, an array of pixel values.
Derived parameters: (note that responsivity is named ψ earlier in this thread).
responsivity = 1/video_scale
exposure_max_ADU = FPE_MAX_ADU * exposure_count
compression_per_ADU = compression_parameter/exposure_max_ADU
compression_per_electron = responsivity * compression_per_ADU
Function: electrons->ADU
compression = 1.0 + compression_per_electron * data_electrons
data_ADU = responsivity * data_electrons/compression
Function: ADU->electrons
decompression = 1.0 - compression_per_ADU * data_ADU
data_electrons = video_scale * data_ADU/decompression
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