Midterm_Test_2012_sol.pdf
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《 数 字 图 像 处 理 》 测 试 题
( 测试时间: 共 1 小时)
方向： 姓名： ______ 学号：
1. (20 pts) In an image compression system, 192000 bits are used to represent a
800x600 image with 256 gray levels. What is the compression ratio for this
system?
192000
100% 5%
800 600 8
2. (20 pts) Among the 3 proposed histograms, which is the one corresponding to the
shown image? Why?
Histogram A does not show a peak for the background, so it can't be the one. The
designated pixel is the darkest in the image, but there are quite a lot of pixels in
Histogram C that are darker. So the right histogram is B. Other arguments: in the
upper left corner is the transition between the tool and the background very
smooth, which means that gray levels are close to each other in that region. It
justifies that the 2 peaks corresponding to the 2 objects are close to each other.
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