Posted by
Kenneth Sloan-2 on
Nov 20, 2020; 11:15pm
URL: http://imagej.273.s1.nabble.com/FloatProcessor-convolve-tp5024215.html
I'm seeing strange results from:
===================================
FloatProcessor fp;
float[] kernel = {...}
...
fp.convolve(kernel,height,width);
===================================
It produces expected results for (for example):
float[] kernel = {1.0f, 0.0f, -1.0f};
but appears to do nothing at all for:
float[] kernel = {1.0f, -5.0f, 1.0f};
note: i've been thrashing on this, so that might not be *quite* right - but there are kernels which
do absolutely nothing. Perhaps {0.0f, -5.0f, 0.0f} is a better example.
My first thought is that there is some sort of kernel normalization being done. Is that correct? and if so, how do I control it (I'd like to turn it off, completely)
I notice that in the "commands" part of the manual, there is a dialog box which includes a checkbox for "normalize kernel". But, I don't immediately see where to do this (or, in my case *not* do it) when writing Java code.
I have temporized by using {1.0f, -2.0f, 1.0f} which appears to work as expected.
So...I'm moving ahead - but I'm curious about what I am missing here.
--
Kenneth Sloan
[hidden email]
Vision is the art of seeing what is invisible to others.
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