07. Quiz: Image Operations

Image Processing

Most image processing techniques are just ways to mathematically operate on an image pixel-by-pixel. You can think of processing, as taking in an image, F(x, y), and outputting a transformed image G(x, y) which may have pixels of a different color or in a different location as the original image. With this in mind, take a look at the following quiz.

QUIZ QUESTION::

Given a grayscale image, F(x, y), match each of the following transformations with their application.

ANSWER CHOICES:

Move the image 100 pixels up

Darken the image

Create a purely black and white image (no gray)

Move the image 100 pixels down

Subtract another image F2(x, y), of the same size) from the original image

Application	Transformation
G(x, y) = {0 if F(x, y) < 150, and 255 otherwise
G(x, y) = 0.5*F(x, y)
G(x,y) = F(x, y) - F2(x, y)
G(x, y) = F(x, y+100)
G(x, y) = F(x, y-100)

SOLUTION:

Application	Transformation
G(x, y) = {0 if F(x, y) < 150, and 255 otherwise	Create a purely black and white image (no gray)
G(x, y) = 0.5*F(x, y)	Darken the image
G(x,y) = F(x, y) - F2(x, y)	Subtract another image F2(x, y), of the same size) from the original image
G(x, y) = F(x, y+100)	Move the image 100 pixels down
G(x, y) = F(x, y-100)	Move the image 100 pixels up