Re: TrakEM Mipmap regeneration slow

Posted by Stephan Saalfeld on Jul 12, 2013; 1:18am
URL: http://imagej.273.s1.nabble.com/TrakEM-Mipmap-regeneration-slow-tp5003921p5003938.html

Ok.  I was misdirected by that I thought you saw Gaussian convolution
happening during mipmap generation.  That would happen only of the
resizing mode was Gaussian downsampling.

To clarify:  With are downsampling, Gaussian convolution happens not
during mipmap generation but only during feature extraction.  That is,
you should limit the number of Threads for feature extraction to a low
number (e.g. 4) to avoid excessive multi-threading beyond your
CPU-count.  One of the most expensive operations during feature
extraction is Gaussian convolution with large kernels and we have
all-CPUs multi-threaded this some time ago in ImageJ's core.

Please let me know how it goes.

Best,
Stephan



On Thu, 2013-07-11 at 13:14 -0700, Ashwin wrote:

> Hi Stephan,
>
> please change, under Project>Project Properties, Image resizing mode to
>
> Area downsampling
>
> This is the default. I have not changed this. Also, I save the mipmaps as
> .rag (also the default)
>
> I shall give the script a try.
>
> Thanks,
> Ashwin
>
>
>
>
>
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