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: The rotation transformation relies on the Gaussian kernel (called w in the article) being circular symmetric, something that is not mentioned in the intial definition of the structure tensor in the aricle. --[[User:KYN|KYN]] ([[User talk:KYN|talk]]) 20:23, 1 October 2013 (UTC)
== Possible error in equation? ==
Is there an incorrect equation in the section Complex Version?
The expression of <math>\lambda_2</math> (in terms of <math>\kappa_{20}</math> and <math>\kappa_{11}</math>) seems incorrect to me:
In my opinion it should be:
<math display="block">(Re(\kappa_{20})-\kappa_{11})/2=\lambda_2</math>
instead of
<math display="block">(\kappa_{20}-|\kappa_{11}|)/2=\lambda_2</math>
as is stated there.
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