Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

Corner Detection

The Sobel and Scharr first derivative operators are to be used to take the x and y derivatives of an image. Then a small region of interest (ROI) is to be defined to detect corners in.
A 2x2 matrix of sums of the
x
and
y
derivatives is created as follows:
Solving
where λ is a column vector of the eigen values and
I
is the identity matrix, gives the eigen values. For the 2x2 matrix of the equation above, the solutions may be written in a closed form:
If
λ
1
,
λ
2
>
t
, where
t
is some threshold, then a corner is considered to be found at that location. This can be very useful for object or shape recognition.

Product and Performance Information

1

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