Digital Image Processing

Homework 4, Due 2019/5/21

Problem 1

Blurring prior to resizing

Write a program to blur and then resize the image. (Figure 4.19, Page 238)

(a) Resize the image to 50% of its original size using the resizing method in Exercise 1 of Lab 1.

(b) Blur the image with a 3*3 averaging filter using the Averaging Filter in Lab 3, and then resize the image to 50% of its original size using the resizing method in Exercise 1 of Lab 1.

Fig0417(a).bmp

Problem 2

Moiré patterns

Write a program to show Moiré patterns. (Figure 4.20, Page 239)

(a) Rotate the image 5 degrees clockwise using the result of Problem 2 in Homework 2.

(b) Multiply the original image and (a) to obtain Moiré patterns. (Sample result: Lines5.bmp)

Lines.bmp

Problem 3

Show the spectrum and phase

Write a program to perform to show the spectrum and phase of a rotated rectangle. (Figure 4.24(c), Page 251)

(a) Rotate the rectangle using the result of Problem 2 in Homework 2.

(b) Show the spectrum and phase.

Fig0424(a).bmp

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