Re: measuring two lines perpendicularly

Posted by Herbie on Feb 01, 2016; 10:55am
URL: http://imagej.273.s1.nabble.com/measuring-two-lines-perpendicularly-tp5015503p5015509.html

Dear Romain,

as far as I know there is no ImageJ-tool that _restricts manual drawing_
at 90deg with respect to an existing line.

One approach I can think of is a ImageJ-macro that draws an arbitrary
perpendicular line to an existing one (it was recently discussed on this
list). Of course this line isn't positioned correctly and its length
isn't what you want. However, it is possible to position it manually
without changing its orientation. However, changing its length without
changing its orientation may be problematic.

Another approach my be the various options in "Set Measurements". Did
you consider those? For descriptions you may have a look at the
ImageJ-manual.

HTH

Herbie

:::::::::::::::::::::::::::::::::::::::::
Am 01.02.16 um 11:38 schrieb Romain Penz:

> Dear Herbie,
>
> I need to measure the length and width of spores in µm.
>
> When using the term "manually" I mean to simply use the straight line
> tool to draw length or width of spore using the mouse or the pad of
> my laptop to point the starting point and the ending point of each
> line and then use the measure tool (ctrl+m) ("manually" is opposed in
> my mind to the measure plugins which can measure automatically some
> data about ROI). The only thing I need to be automatic is that the
> second line I draw is fitting to a 90° angle to the first one when I
> have defined the starting point (even if the two lines are not secant
> ones, like needed with some spores which look like curved sausages
> (see the second picture even if the two lines are not
> perpendicular)).
>
> To see what I want to do I attach a picture on which we can see on
> each spore two straight lines perpendicular to each other (picture
> from another software).
>
> Thanks
>
> ________________________________________ De : ImageJ Interest Group
> <[hidden email]> de la part de Herbie <[hidden email]> Envoyé :
> lundi 1 février 2016 09:55 À : [hidden email] Objet : Re:
> measuring two lines perpendicularly
>
> Dear Romain,
>
> what do you mean by: "[...] measure manually two consecutive lines
> [...]"
>
> What do you like to measure? The intensity profile?
>
> Please be more specific.
>
> Herbie
>
> ::::::::::::::::::::::::::::::::::::::::: Am 31.01.16 um 23:30
> schrieb Romain Penz:
>> Dear all,
>>
>>
>> Is there a way to measure manually two consecutive lines using the
>> straight line tool, the second being perpendicular to the first
>> one (automatically fitting to a 90° angle to the first one when
>> drawn)?
>>
>>
>> I've searched for macro or plugin doing this but with no result.
>>
>>
>> I need this functionality to measure fungal spores. So i have to
>> measure the length and the width of spores (so two lines per
>> spore) and the two lines used to measure these data have to be
>> perpendicular to each other.
>>
>>
>> Thanks,
>>
>>
>> Romain
>>
>> -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>>
>
> -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>
> -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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