There is a sharp change in intensity a sharp change in color.
Image can be read as a matrix an array of pixels that contains the light intensity at some location.
0 : no intensity if something is completely black
255 : maximum intensity that something being completely white
a strong gradient : a steep change
a small gradient : a shallow change
- cv2.Canny
cv2.Canny(image, low_threshold, high_threshold)
Compute the derivative in all directions of the image.
And then traces the strongest gradients as a series of white pixels.
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