Re: Draw random dots only within a ROI

Posted by Krs5 on Nov 17, 2014; 10:43pm
URL: http://imagej.273.s1.nabble.com/Draw-random-dots-only-within-a-ROI-tp5010470p5010501.html

Dear Davide,

OK, see if the code below does what you want

dotSize = 25;
Roi.getBounds(x,y,w,h);
for (i=0; i<25; i++) {
        x1 = (random()*w-dotSize/2)+x;
        y1 = (random()*h-dotSize/2)+y;
        makeOval(x1, y1, dotSize, dotSize);
        run("Fill");
}
run("Select None");

Best wishes

Kees
________________________________________
From: ImageJ Interest Group [[hidden email]] on behalf of Zeta [[hidden email]]
Sent: 17 November 2014 22:35
To: [hidden email]
Subject: Re: Draw random dots only within a ROI

Kees,

it doesn't really matter, since the dot will be only a reference. The
easiest things would work. :)

Davide

2014-11-18 11:31 GMT+13:00 Straatman, Kees (Dr.) [via ImageJ] <
[hidden email]>:

> Hi Davide,
>
> Second question: should the whole dot fall within the ROI or only the
> center of the dots. In the last case part of the dot will fall outside of
> the ROI.
>
> Kees
> ________________________________________
> From: ImageJ Interest Group [[hidden email]
> <http://user/SendEmail.jtp?type=node&node=5010499&i=0>] on behalf of Zeta
> [[hidden email] <http://user/SendEmail.jtp?type=node&node=5010499&i=1>]
> Sent: 17 November 2014 22:21
> To: [hidden email] <http://user/SendEmail.jtp?type=node&node=5010499&i=2>
> Subject: Re: Draw random dots only within a ROI
>
> Hi Kees,
>
> the ROI will be rectangular shape.
>
> I have a picture of a plate with fouling organisms on it, and I need to
> generate 50 dots in the bottom part of the plate and 50 in the top part
> (two
> rectangular ROIs).
>
> A way to go would be to crop the image and generate random dots across the
> cropped part, but i have about 800 plates and each picture would be
> cropped
> twice. The time needed would be enormous.
>
> Thank you
> Davide
>
>
>
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--
*Davide Zazzaro*
Research PhD student
Department of Marine Science
University of Auckland
Auckland 1010
New Zealand
Tel: [phone]




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