Edge detection Flashcards
1
Q
What is convolution?
A
Convolution is sliding a window(kernel/filter) across all pixels in the image, and using the pixel values to calculate new pixel values.
2
Q
What types of filters can be used for edge detection? Quickly explain how they work
A
Low pass: blocks higher frequencies High pass: blocks lower frequencies Band-pass: Chooses a certain range Feature detection: Detecting edges, corners, texture Also Canny (another question tho)
3
Q
How does the Canny filter work? (4 steps)
A
Noise reduction
Find intensity gradient
Non-max suppression
Tracing edges and thresholding
4
Q
What is an edge?
A
An edge is a strong change in pixel intensity in an image. Aka the gradient is hiiiigh
