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Edge Detection - Coggle Diagram

- - - - edge thinning technique
      - after gradient calculation, edge is blurring
      - suppress all gradient values to 0 , except for local maxima
      - Local maxima is sharpest change of intensity
      - compare edge strength of current pixel with edge strength of pixel in pos and neg gradient direction
    - - define 2 thresholds : high and low
      - grad magnitude > high = strong edge
      - grad magnitude < low = noise
      - grad magnitude is in between low and high = weak edge
      - Accept all weak edges connected to strong edgs