Re: Lenght measurement

Posted by Krs5 on Jan 18, 2016; 1:10pm
URL: http://imagej.273.s1.nabble.com/Lenght-measurement-tp5015403p5015408.html

Dear Alexander,

I could imagine something that creates a line between the start point, centre of mass and endpoint of your selection. Centre of mass can be found via Threshold, followed by Analyse Particles with Centre of mass selected in Set Measurements. After that use Edit > Selection > Fit Spline and measure the line.

Best wishes

Kees

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Leon Espinosa
Sent: 18 January 2016 12:51
To: [hidden email]
Subject: Re: Lenght measurement

Maybe there is a different approach: as you have a kind of bend rectangle we can assume that Area = width x length . By thresholding/segmentation you can have a good measure of the area. And maybe you can manually measure 3 or 5 "widths" and calculate a mean width. Now a stimation of the length will be Area/meanWidth . With Feret or distance maps you can have an automatic and precise measure of the mean width.

All the best,

Leon


Le 18 janv. 2016 à 11:19, Alexander V. Kalachev a écrit :

> Dear ImageJ users,
>
> for our current project we need to measure length of spermatozoa
> nucleus. It is curved in shape (see example image attached, nucleus
> outlined with white dashed line) and we have no idea how to measure
> its length. Could anyone provide us with an advice how to measure the length of such curved figure?
>
> With kind regards,
> Alexander
>
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> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
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