Image Processing Reference
In-Depth Information
PROBLEMS
8.1
Ten yellow patches with digital input of Y
¼
25.5i,i
¼
0, 1, 2,..., 10 and
D
E
a
*
difference between the
output patches and paper are tabulated in Table 8.11. Find the yellow TRC for
channel-independent linearization.
C
¼
M
¼
0 are printed on a digital printer. The
8.2
(a) Write a general MATLAB code to
find the inverse of function f(x) graphic-
ally from data given by a LUT.
(b) Write a general MATLAB code to
find the inverse of function f(x) numer-
ically from data given by a LUT.
8.3
Ten gray patches are printed on a digital printer and their L*a*b* values are
measured. The resulting data is shown in Table 8.12.
(a) Find the cyan, magenta, and yellow gray-balanced TRCs for this printer.
(b) What would the resulting measured L*a*b* values be if the patches are
printed before and after calibration?
8.4
Design a control loop for 1-D
D
E
a
*
from paper linearization using state feedback
where the plant is modeled as combination of printer and
D
E
a
*
sensor. Linearize
the overall system and check the stability of the system.
8.5
Use Neugebauer model, drive a closed-form expression for the sensitivity matrix
B at a nominal CMY value.
TABLE 8.11
D
E
a
*
Difference between the Output Patches and Paper
Y
0
25.5
51
76.5
102
127.5
153
178.5
204
229.5
255
D
E
a
*
0
0.8
3.3
7.3
12.8
20
29
39.5
51.5
65
80
TABLE 8.12
Gray Patches: CMY!L*a*b*
C
M
Y
L*
a*
b*
0
0
0
92.5
0.19
0.09
25
25
25
88.7
0.06
0.12
51
51
51
76.9
0.87
0
76
76
76
67.22
0.13
0.19
102
102
102
55.61
0.09
0.05
127
127
127
47.33
0.08
0.09
153
153
153
36.89
0.12
0.08
178
178
178
27.78
0.32
0.08
204
204
204
18.72
0.13
0.11
229
229
229
7.98
0.07
0.08
255
255
255
3.45
0.09
0.08
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