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Formula of cornerEigenValsAndVecs do not same as the harrisCorner

According to this page cornerEigenValsAndVecs, the M of cornerEigenValsAndVecs are different than the harrisCorner proposed.

(1) (dI / dx) * (dI / dx) == A (2) (dI / dx) * (dI / dy) == B (2) (B * B) == C (3) (dI / dy) * (dI / dy) == D

The M of cornerEigenValsAndVecs on the link is

A C
C D

The M of harrisCorner proposed is

A B
B D

It is a mistake of the document?I get it wrong?Or there are a reason to calculate the M like the document say?

Formula Matrix formula of cornerEigenValsAndVecs do not same as different from the harrisCornerharrisCorner proposed

According to this page cornerEigenValsAndVecs, the M of cornerEigenValsAndVecs are different than the harrisCorner proposed.

(1) (dI / dx) * (dI / dx) == A (2) (dI / dx) * (dI / dy) == B (2) (B * B) == C (3) (dI / dy) * (dI / dy) == D

The M of cornerEigenValsAndVecs on the link is

A C
C D

The M of harrisCorner proposed is

A B
B D

It is a mistake of the document?I get it wrong?Or there are a reason to calculate the M like the document say?

Matrix formula of cornerEigenValsAndVecs different from the one harrisCorner proposed

According to this page cornerEigenValsAndVecs, the M of cornerEigenValsAndVecs are different than the harrisCorner proposed.

(1) (dI / dx) * (dI / dx) == A (2) (dI / dx) * (dI / dy) == B (2) (B * B) == C (3) (dI / dy) * (dI / dy) == D

The M of cornerEigenValsAndVecs on the link is

A C
C D

The M of harrisCorner proposed is

A B
B D

It is a mistake of the document?I get it wrong?Or there are a reason to calculate the M like the document say?

Matrix formula of cornerEigenValsAndVecs different from the one harrisCorner proposed

According to this page cornerEigenValsAndVecs, the M of cornerEigenValsAndVecs are different than the harrisCorner proposed.

(1)    (dI / dx) * (dI / dx) == A
(2)    (dI / dx) * (dI / dy) == B
(2)    (B * B) == C
(3)    (dI / dy) * (dI / dy) == D

D

The M of cornerEigenValsAndVecs on the link is

A C
C D

The M of harrisCorner proposed is

A B
B D

It is a mistake of the document?I get it wrong?Or there are a reason to calculate the M like the document say?

click to hide/show revision 5
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Matrix formula of cornerEigenValsAndVecs different from the one harrisCorner proposed

According to this page cornerEigenValsAndVecs, the M of cornerEigenValsAndVecs are different than the harrisCorner proposed.

(1)    (dI / dx) * (dI / dx) == A
(2)    (dI / dx) * (dI / dy) == B
(2)    (B * B) == C
(3)    (dI / dy) * (dI / dy) == D

The M of cornerEigenValsAndVecs on the link is

A C
C D

The M of harrisCorner proposed is

A B
B D

It is a mistake of the document?I get it wrong?Or there are a reason to calculate the M like the document say?