[Insight-users] discrete vs. recursive Gaussian derivatives image filter

[Moti Freiman]

Hi all,
We tested the output of both discrete and recursive Gaussian
derivatives image filter on synthetic image including only
one pixle with value 1 in the center. All other pixels were set to
zero, expected to get almost similar results.
However, The output of the recursive filter was much higher than the
discrete one, almost in ten Gaussian sigma factor.
We used the normalizedacrossscale option, so we assumed that the
vlaues should be normalized and should get the same value.
Any ideas?
Many thanks.
Moti

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Moti Freiman, Ph.D Student.
Medical Image Processing and Computer-Assisted Surgery Laboratory.
School of Computer Science and Engineering.
The Hebrew University of Jerusalem Givat Ram, Jerusalem 91904, Israel
Phone: +(972)-2-658-5371 (laboratory)
WWW site: http://www.cs.huji.ac.il/~freiman