Deck 6: Image Processing: Nested for Loops, Functions As Parameters, Namespaces, Lists of Lists

Question 1

Resolution is typically expressed as a number of:

A) pixels.
B) megapixels.
C) digital dots.
D) RGB.

Answer 1

B

Question 2

A color with 255 red intensity, 0 green intensity, and 255 blue intensity will be:

A) magenta.
B) red.
C) blue.
D) white.

Answer 2

A

Question 3

How many different color combinations are possible in the RGB color model?

A) 10
B) 255
C) 777,216
D) 16,777,216

Answer 3

D

Question 4

What module contains objects that allow us to construct and manipulate pixels?

A) RGB
B) pixelimg
C) cImage
D) pImage

Question 5

Case Study 1:
>>> p = Pixel(200, 100, 150)
>>> p
(200, 100, 150)
>>> p.getRed()
1. ??????
>>> p.setBlue(20)
>>> p
2. ??????
>>>
-Refer to the session in the accompanying Case Study 1. What is printed on line 1?

A) 200
B) 100
C) 150
D) (200, 100, 20)

Question 6

Case Study 1:
>>> p = Pixel(200, 100, 150)
>>> p
(200, 100, 150)
>>> p.getRed()
1. ??????
>>> p.setBlue(20)
>>> p
2. ??????
>>>
-Refer to the session in the accompanying Case Study 1. What is printed on line 2?

A) (20, 100, 150)
B) (200, 20, 150)
C) (200, 100, 170)
D) (200, 100, 20)

Question 7

What statement constructs a window that is 600 pixels wide and 400 pixels high?

A) PixelWin(400, 600)
B) PixelWin(600, 400)
C) ImageWin("Image Processing", 400, 600)
D) ImageWin("Image Processing", 600, 400)

Question 8

What image object is used to create an image from a file?

A) FileImage
B) PixelImage
C) EmptyImage
D) ImageWin

Question 9

What method would you use to get the width of an image?

A) getWidth
B) getHeight
C) getPixels("width")
D) width

Question 10

When creating an empty image, what is the color of each pixel?

A) White
B) Yellow
C) Blue
D) Black

Question 11

What is the name for the type of iteration shown in the session below?
>>> for num in range(3):
For ch in "cat":
Print(num, ch)

A) Listed
B) Nested
C) Recursive
D) Range

Question 12

Which of the following is a grayscale color?

A) (1, 2, 3)
B) (30, 30, 30)
C) (0, 20, 20)
D) (255, 0, 0)

Question 13

Case Study 2:
>>> def squareIt(n):
return n * n
>>> squareIt(3)
9
>>> squareIt(squareIt(3))
1. ??????
>>> squareIt
&It;function squareIt at 0x0000022740D68E18>
>>> z = squareIt
>>> z(3)
9
>>> z
2. ??????
-Refer to the session in the accompanying Case Study 2. What is printed on line 1?

A) 9
B) 81
C) function squareIt at 0x0000022740D68E18
D) An error message

Question 14

Case Study 2:
>>> def squareIt(n):
return n * n
>>> squareIt(3)
9
>>> squareIt(squareIt(3))
1. ??????
>>> squareIt
&It;function squareIt at 0x0000022740D68E18>
>>> z = squareIt
>>> z(3)
9
>>> z
2. ??????
-Refer to the session in the accompanying case study. What is printed on line 2?

A) 9
B) 81
C) function squareIt at 0x0000022740D68E18
D) An error message

Question 15

Parameters that are defined within a function are called:

A) actual parameters.
B) formal parameters.
C) passed parameters.
D) assigned parameters.

Question 16

When a window is constructed, it is not immediately displayed.

Question 17

We can access a particular pixel by using the getPixel method.

Question 18

To create a negative pixel, we subtract the red, green, and blue intensities from 255.

Question 19

In Python, all the names defined in a program, whether for data or for functions, are organized into namespaces.

Question 20

When a function is invoked, a new namespace known as the function namespace is created corresponding to the function itself.

Question 21

Match each definition with its term.
-Holds the name of the current namespace.

A) __name__
B) Local variables
C) builtins namespace
D) Edge detection

Question 22

Match each definition with its term.
-Created within a function.

A) __name__
B) Local variables
C) builtins namespace
D) Edge detection

Question 23

Match each definition with its term.
-Includes all of the system-defined names of functions and data types used regularly in Python.

A) __name__
B) Local variables
C) builtins namespace
D) Edge detection

Question 24

Match each definition with its term.
-Tries to extract feature information from an image by finding places in the image that have dramatic changes in color intensity values.

A) __name__
B) Local variables
C) builtins namespace
D) Edge detection

Question 25

Explain how to create a negative image at the pixel level.

Question 26

What kinds of operators can be used with a function?

Question 27

What terms would be used to describe the numbers 3 and 4 in the following code listing? Why?
>>> hypotenuse(3, 4)
5.0

Question 28

How are parameters passed into a function in Python?

Question 29

What are the ramifications of the call by assignment parameter in Python? How does program execution differ depending on whether the actual parameter is mutable or immutable?

Question 30

What are namespaces? Describe the builtins namespace.

Question 31

How can you discover the names of the objects in the built-in namespace?

Question 32

Explain how the different Python namespaces are organized with respect to one another.

Question 33

Provide a description on how you might use a Python program to resize an image.