# midterm-key - CS559 Midterm Page 1 of 6 Name: _KEY_ CS...

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CS559 Midterm Name: __ KEY ________________ Page 2 of 6 CS Login: _____________________ Question 1: (4 Points) Define metamer (in the sense used in graphics – it has another meaning in chemisty): Metamers are colors that are perceptually indistinguishable. Two different distributions of light that cause the same sensor response. Question 2: (4 Points) If Lightness is linearly coded between 0 and 255, is the difference between 100 and 101, or the difference between 200 and 201 more noticeable (perceptually)? Explain your answer. 100 to 101 – it’s a 1% difference (while 200 to 201 is a .5% difference, and since the eye sees relative differences that’s what matters) Question 3: (8 Points) A quadratic Bezier curve in 2D has its control points at (0,0), (6,6), and (12,0). What are the control points for an identical cubic Bezier curve? (0,0), (4,4), (8,4), (12,0) to match the derivatives, remember that the scaling factor for Beziers is the degree, so: 2(P1-P0) (for points on the quadratic) = 3(P1-P0) (for points on the cubic) Question 4: (5 Points) Which of the following things are artifacts from aliasing? Note: there might be several things that are aliasing, so mark each one as either “A” for aliasing or “N” (for not). _ N
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## This note was uploaded on 03/29/2008 for the course BUSI&CS CS559, MTK taught by Professor Lizhang during the Spring '08 term at University of Wisconsin.

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midterm-key - CS559 Midterm Page 1 of 6 Name: _KEY_ CS...

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