TABLE OF CONTENTS 8.1 A viewer sits 40 cm from a computer monitor. She observes an image in the center of the screen that measures 10 cm on each side. The image is represented in the computer by 1000 1000 pixels. We will assume optimal but unspecified viewing conditions. From the MTF graph of Fig. 8.1, answer the following questions.
The MTF of Fig. 8.1 is given as a function of cycles per degree. For what spatial frequencies (in cycles/mm) on the screen is the apparent intensity reduced by 50% from the maximum?
What digital frequency used in the function f( x, y) = cos(2 ? f 0 x) will produce these frequencies?
How does the answer to the previous question change if f( x, y) = cos(2 ? f 0 y)?
How does the answer to the previous question change if f( x, y) = cos[2 ?( f x x+ f y y)]?
8.2 Color matching functions (CMFs) are always referenced to a specific set of primaries. Recall that the standard CIE RGB color matching functions are referenced to monochromatic lines at 435.8 nm, 546.1 nm and 700 nm. The transformation of CMFs from one set of primaries to another was developed using matrix algebra in Section 8.3.3. However, color matching functions are tabulated with wavelength spacing ranging from 1 nm to 10 nm. Given...
