
References 347
not necessarily true even when the camera moves perpendicularly to the optical
axis.
For example, the images of objects at different distances from the film
move by different amounts, thereby producing a spatially varying blur.
Several investigators have also considered the effect of camera shutter oper-
ation on the point spread function of motion degradation [39, 76, 88].
In Section 7.2.2 we discussed the problem of determining the point spread
function h(x, y) a posteriori from the degraded image g(x, y). The method
for estimating the transfer function H(u,v) given by Eq. (15) is a result of
Stockham's work on the restoratio ...