Posted by
dscho on
Feb 15, 2014; 5:12pm
URL: http://imagej.273.s1.nabble.com/Visual-grep-doesn-t-find-anything-tp5006303p5006535.html
Hi Flash,
On Mon, 27 Jan 2014, Ja wrote:
> Does anybody have any idea how Visual grep plugin works? I opened image,
> copied small part of it to clipboard, then set it as needle and it
> doesn't find anything. Why is that? Anybody managed to make it work?
Visual grep tries to accelerate things by downsampling both needle and
haystack a couple of times and find candidate locations in the coarser
resolutions. If that does not find the correct locations, finer resolution
steps will necessarily fail.
Please also keep in mind that the provided information is insufficient
[*1*] for the author of the plugin (read: myself) to get a clear picture
what might go wrong.
If you require further help [*2*], you might want to consider offering an
example image with a recorded macro of the process that "doesn't find
anything".
Ciao,
Johannes
Footnote *1*: A good, but slightly long, read on what makes a good bug
report (and why this is something you want to do instead of the
alternative) can be found here:
http://www.chiark.greenend.org.uk/~sgtatham/bugs.htmlFootnote *2*: A good, but slightly long, read on why it makes more sense
to describe in detail 1) what you want to accomplish, 2) what you tried,
3) what unexpected behavior you encountered, instead of stating that it
did not work for you and asking for a solution, i.e. follow the principles
of systematic scientific process even when asking for help on a mailing
list, can be found here:
http://mattgemmell.com/what-have-you-tried/--
ImageJ mailing list:
http://imagej.nih.gov/ij/list.html