television screen. The image becomes stretched, in this case, horizontally. Round
objects become oval. While this may not be of critical importance in the
entertainment industry, it can be problematical in science, where quantification
is more important.
Modern image display devices are often capable of operating in several
different aspect ratio modes, and one can often select a mode that minimizes
distortion. Software is readily available that can stretch an image horizontally or
vertically by a specified amount (see Chapter 5). A simple test is to generate
a digital image that contains a square object and measure the height and width
of its displayed image.
4.2.3 Photometric Resolution
For display systems, photometric resolution refers to the accuracy ...