Digital Image Processing
Homework 1, Due 2014/3/17
Problem 1
Reducing the Number of Gray Levels in an Image
(a) Write a computer program capable of reducing the number of gray levels in a
image from 256 to 2, in integer powers of 2. The desired number of gray levels
needs to be a variable input to your program.
(b) Download Fig. 2.21(a) and duplicate the results shown in Fig. 2.21 of the book.
Problem 2
Zooming and Shrinking Images by Bilinear Interpolation (or linear interpolation in x or in y)
(a) Write a computer program capable of zooming and shrinking an image by
bilinear interpolation. The input to your program is the desired size of the resulting
image in the horizontal and vertical direction. You may ignore aliasing effects.
(b) Download Fig. 2.19(a) and use your program to shrink this image from 1024 x
1024 to 256 x 256 pixels.
(c) Use your program to zoom the image in (b) back to 1024 x 1024. Explain the
reasons for their differences.
ftp your homework to
ftp://2014csc551@140.127.208.211/
in the directory \HW1
by the following format:
檔案名稱:hw#_學號.zip
例如:資工同學,作業4
檔案名稱:hw4_a09755xx.zip. (注意:檔案名稱不能有中文)
The password is given in class.