Re: Trouble running "Custom filter..." from plugin

Posted by Gluender-3 on Mar 16, 2010; 9:59am
URL: http://imagej.273.s1.nabble.com/Trouble-running-Custom-filter-from-plugin-tp3688954p3688957.html

Neil,

not sure, but the IJ-manual (always a good source for inspiration) says:

"There is no arbitrary limit to the size of the kernel but it must be
square and have an odd width."

>Hi list,
>
>I'm not getting the results I expect when I call the "Custom Filter..." menu
>command from a plugin.  I'm writing a plugin that iteratively applies a
>custom filter to a series of small pixel blocks of the input image.  All
>images are 32 bit floats.  Here is a schematic of the steps I take:
>
>- Create a filter image block, a 4x4px imageplus (imFilter) in a window
>titled "Filter"
>- For simple testing I'm using a filter where the values are unity at the
>edges and zero elsewhere:
>   1 1 1 1
>   1 0 0 1
>   1 0 0 1
>   1 1 1 1
>- I create a new image from the original image (imp) to form my current
>"block" (imBlock), again a 4x4 square image block
>- For testing I'm forcing the values in this block to have known values:
>   0 1 2 3
>   0 0 0 0
>   4 5 6 7
>   0 0 0 0
>- I use "Custom Filter..." to filter imBlock with imFilter.
>
>If I do the Custom Filter manually by using the menus I get an image block
>that appears smoothed, which I'm expecting.  But if I try to automate this
>in my plugin, the image block ends up as just a 4x4 image with zero-valued
>pixels everywhere.
>
>The command I'm using to call the filter is:
>   ij.IJ.run(imBlock, "Custom Filter...", "filter=[Filter]");
>
>Is there something implicitly wrong with the way I am calling the filter?
>Any suggestions/criticisms would be gratefully received.
>
>Many thanks, Neil

HTH
--

                   Herbie

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