Coursera《Fundamentals of Digital Image and Video Processing》(Quiz of Week1)

Introduction to Image and Video Processing

本博客为Coursera上的课程《Fundamentals of Digital Image and Video Processing》第一周的测验。

目录

1. 第一题
2. 第二题
3. 第三题
4. 第四题
5. 第五题
6. 第六题
7. 第七题
8. 第八题

Coursera课程地址

第一题

1. Which of the followings are digital signals? Check all that apply.

   A. text messages received on a cellphone
   B. videos streamed from online sources
   C. sound tracks stored on a CD
   D. pencil drawing made on a piece of paper
   E. an x-ray film image

   答案：ABC

第二题

1. Functional magnetic resonance imaging (fMRI) is a technology where volumetric scans of the brain are acquired while the subject is performing some cognitive tasks over time. Based on this description, what is the dimensionality of fMRI output signals?

   A. 1D
   B. 2D
   C. 3D
   D. 4D
   E. more information is needed to answer this question

   答案：D

第三题

1. True or false: All digital images are visible, i.e., they are all captured with visible light.

   A. true
   B. false

   答案：B

第四题

1. Digital videos are signals that are discrete in time.

   A. true
   B. false

   答案：A

第五题

1. Which of the following are examples of electromagnetic (EM) waves? Check all that apply.

   A. microwave
   B. ripples in a lake
   C. sound wave
   D. light from the sun
   答案：AD

第六题

1. True or false: Digital image processing is a subject distinctly different from computer vision.

   A. true
   B. false

   答案：B

第七题

1. Approximately, how many different 100x100 binary digital images exist? How many 24bit-RGB color images of the same size exist? (Hint: for binary images each pixel can assume one of two values; for 24bit-RGB color images each pixel has three color channels and each color channel can assume one of 256 values.)

   A. 2¹⁰⁰⁰⁰ for binary images and 2^24×10000 for 24bit-RGB color images
   B. 2¹⁰⁰ for binary images and 2^24×100 for 24bit-RGB color images
   C. 100² for binary images and 100²⁴ for 24bit-RGB color images
   D. 10000² for binary images and 10000²⁴ for 24bit-RGB color images
   E. infinitely many for both binary and 24bit-RGB color images

   答案：A

第八题

1. Suppose your smart phone has a 10-megapixel camera (1 megapixel = 10⁶ pixels). Without any form of compression, how big would a 24bit-RGB color image be? (Hint: 1 byte = 8 bits)

   A. 30 megabytes
   B. 10 megabytes
   C. 300 kilobytes
   D. more information is needed to answer this question

   答案：A

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