desired linear relationship. Special calibration targets containing objects of known
brightness are commonly used to determine the relationship. Step wedge targets
and fluorescent beads of known size and brightness are often useful.
3.7 Geometric Distortion
Geometric distortion is an unwanted ‘‘warping’’ of the image that distorts the
spatial relationship among the objects in the image. It can change the apparent
size and shape of objects and the spacing between them. Geometric distortion
can undermine the accuracy of spatial measurements, such as length, area,
perimeter, shape, and spacing.
Most modern microscope imaging systems use solid-state image sensor
arrays. The pixel geometry is carefully controlled in the manufacturing process,
and geometric ...