You completely did not say that at the beginning.
In any case, use a Sobel filter to get the Gx and Gy values.
The direction you want to find should be stored as a CVector2( X, Y ).
Create a new CVector2( Gx, Gy ) and normalize it.
The magnitude in the direction CVector2( X, Y ) is:
CVector2( X, Y ) DOT CVector2( Gx, Gy ).
Done and done.
Edited by L. Spiro, 20 February 2013 - 11:01 PM.
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