Quiz 1

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University of Illinois, Urbana Champaign *

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543

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Computer Science

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Jan 9, 2024

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pdf

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Quiz 1 Due No due date Points 25 Questions 25 Available Sep 29 at 12:01am - Oct 2 at 11:59pm Time Limit 90 Minutes Score for this quiz: 20 out of 25 1 / 1 pts Question 1 Consider the following images. Rearrange the FFT spectrum into the correct sequence so that the spectrum matches with the image. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 1 頁，共 21 頁 2024/1/3 下午 05:10
1. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 2 頁，共 21 頁 2024/1/3 下午 05:10
2. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 3 頁，共 21 頁 2024/1/3 下午 05:10
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3. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 4 頁，共 21 頁 2024/1/3 下午 05:10
4. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 5 頁，共 21 頁 2024/1/3 下午 05:10
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1. 2. Quiz 1: Fall 2023-ECE 549-Computer Vision-Sections A, ONL file:///C:/Users/user/Downloads/CS%20543%20quizzes/Quiz%201%... 第 7 頁，共 21 頁 2024/1/3 下午 05:10
3.
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Both 1 and 2 are true Correct!
(d) Parallelism is not preserved in non-uniform scaling. (a) orrect Answer
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Consider changes to the Fourier Transform (FT) when an image with resolution (400, 400) is transformed. Which of the following is (are) true? 1. If we rotate the image clockwise by 90 degrees, the FT of the new image will always be the FT of the original image rotated clockwise by 90 degrees. 2. If we shift the image by 4 pixels to the left, the FT of the new image will always be the FT of the original image.
If f represents linear filtering, c is a scalar constant, and we want to apply the filter X to two images Y and Z, which of the following is equivalent to f(X, cY + Z)?
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1. The summation of edge strength (gradient magnitude) over the image is zero. 2. The summation of gradient vectors over the image is a zero vector. 3. All the gradient vectors are vertical.
For which combination of values of (a, b, c, d, e, f, g, h and i) does the following filter roughly correspond to a Gaussian filter? a = 1/8, b = 2/8, c = 1/8, d = 2/8, e = 4/8, f = 2/8, g = 1/8, h = 2/8, i = 1/8 Correct!
The filter is a low-pass filter Correct!
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Let f be an image and g be a Gaussian filter. Then is equivalent to .
1. 2.
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