Edge Detection Comparison

1
Edge Detection Comparison

• Team Orange Project Proposal

2
Edge Detectors Considered

• Laplace
• Sobel
• Prewitt

3
Laplace

• Applies one (x direction or y direction) 5x5
  convolution filter to a pixel in order to
  determine the gradient of the surrounding pixels.
• Pixel is a member of an edge if the intensity of
  it is greater than that of surrounding pixels.

4
Sobel

• Applies a 3x3 convolution filter row-wise in
  order to determine the gradient of the
  surrounding pixels.
• Pixel is a member of an edge if the intensity of
  it is greater than that of surrounding pixels.

5
Prewitt

• This is similar to the Sobel detector
• Utilizes a similar convolution mask except that
  it is rotated 90 and is applied column-wise

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Parallelization Possibilities

• A common theme for each of the edge detectors is
  the sliding of a matrix over a set of pixels.
• Multiple matrices can be used simultaneously
  (i.e. in parallel) to slide across an image