Image Processing Reference
In-Depth Information
Fig. 4.31
Eight binary images
Exercise 6:
Look at the histogram in Fig.
4.30
. Does it come from a dark or bright
image?
Exercise 7:
Look at the histogram in Fig.
4.30
. Does it come from an image with
high or low contrast?
Exercise 8:
Histogram stretching is performed on the histogram in Fig.
4.30
.After
histogram stretching a pixel has the value 128. What value did this pixel have
before histogram stretching?
Exercise 9:
Calculate the cumulative histogram of image
f
2
(x, y)
in Fig.
4.29
.
Exercise 10:
How will the threshold algorithm look like if two threshold values are
used instead of just one?
Exercise 11:
Explain the two automatic thresholding methods and discuss their dif-
ferences.
Exercise 12:
Given the two binary images A and B in Fig.
4.31
. How can logic
operations be applied to generate the binary images: C, D, E, F, G, and H?
Exercise 13:
The two images
f
1
(x, y)
and
f
2
(x, y)
in Fig.
4.29
are added together.
Calculate the 8-bit output image?
Exercise 14:
The image
f
2
(x, y)
in Fig.
4.29
is inverted and alpha blended with
f
1
(x, y)
where
α
=
0
.
5. Calculate the output image.
Additional exercise 1:
Describe the motivation for using gamma-correction in im-
age capturing and visualization.
Additional exercise 2:
Find and describe alternative automatic thresholding meth-
ods.
