14.4.2 Models for Microscope Image
Formation
Most microscopes can be assumed to be shift-invariant linear systems with
a position-independent psf, where point sources located anywhere in the sample
create psf’s of constant shape at the detector. In its simplest form, then, the
formula for microscope image formation incorporates two known quantities,
the psf, hx, y, zðÞ, and the recorded 3-D image, gx, y, zðÞ, and one unknown
quantity, the actual distribution of light in the 3-D specimen, fx, y, zðÞ.
These terms are related by the imaging equation
gx, y, zðÞ¼fx, y, zðÞhx, y, zðÞ (14:2)
where
*
indicates 3-D convolution. In practice, however, image recording is
corrupted by intrinsic and extrinsic noise. Intrinsic noise obeys a Poisson model
and is introduced ...