hw6 - Due 5:00 PM Wednesday, 4/28/99 EE 695A 1. Homework...

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Due 5:00 PM Wednesday, 4/28/99 EE 695A Homework No. 6 Spring 1999 1. Consider the periodic halftone dot array shown below. Suppose that each dot occupies a fraction a of the area within its square cell. Assume that the dots have no surface reflectance, and a body reflectance given by R C ( λ ), where the C denotes colorant. The paper stock on which the dots are printed reflects a fraction r of the incident light at the surface. The remainder enters the body of the paper. The paper body reflectance function is R P ( λ ). The surface reflectance of the paper does not depend on wavelength. a. Find an expression for R H ( λ ) the spatially averaged reflectance function of the halftone dot array in terms of R C ( λ ) , R P ( λ ), a , and r .. (The averaging can be done over a single halftone cell, or period of the halftone dot array.) b. Suppose that the XYZ tristimulus values (colors) of the dots and the paper substrate are represented by the vectors c C and c P , respectively. Find an
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hw6 - Due 5:00 PM Wednesday, 4/28/99 EE 695A 1. Homework...

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