Gateway routine for optical image irradiance calculation
oi = oiCompute(scene,oi,[opticsModel])
The spectral irradiance image, on the sensor plane, just before sensor
capture is the optical image. This spectral irradiance distribution
depends on the scene and the the optics attached to the optical image
structure, oi.
Three types of optical calculations are implemented in ISET. These are
selected from the interface in the oiWindow, or they can be set via
optics = opticsSet(optics,'model', parameter)
This oiCompute function calls the relevant model depending on the setting
in opticsGet(optics,'model');
The first model is based on diffraction-limited optics and calculated in
opticsDLCompute. This computation depends on the diffraction limited
parameters (f/#) but little else.
The second model is shift-invariant optics. This depends on having a
wavelength-dependent OTF defined and included in the optics structure.
The third model is a shift-variant, full ray trace model. This depends on
having the ray trace information included in the optics model. The
geometric information, relative illumination, and blurring calculations
are usually imported from a full ray trace program, such as Zemax.
It is possible to specify the model in the argument. If it is not
specified, then the optics data in the oi determines the model.
Finally, there is a special case for computing the human optical image.
You may specify the optics model to be 'human'. In that case, this
program calls the routine humanOI, which uses the human OTF calculations
in a shift-invariant fashion.
See also: opticsGet for a description of the optics models.
Example
oi = oiCompute(scene,oi);
oi = vcGetObject('oi'); scene = vcGetObject('scene');
load siZemaxExample00
optics = opticsSet(optics,'model','shiftinvariant');
oi = oiSet(oi,'optics',optics);
oi = oiCompute(scene,oi);
Copyright ImagEval Consultants, LLC, 2005