Re: How to count points within a specified area?
Posted by
voidspaces on
Jan 20, 2014; 5:34am
URL: http://imagej.273.s1.nabble.com/How-to-count-points-within-a-specified-area-tp5006175p5006188.html
Thank you!
On 19 Jan 2014, at 17:32, Rasband, Wayne (NIH/NIMH) [E] [via ImageJ] <
[hidden email]> wrote:
On Jan 18, 2014, at 9:18 AM, voidspaces wrote:
> Hi everyone
>
> I have a picture on which I selected different points with the point tool. I
> also have different areas selected on the same pictures and I would like to
> count the points within a specified area. I thought it would have been
> possible to "AND" the group of points (points are saved in a single ROI) and
> the specified area but as a results I would get the area itself.
Here is a macro that counts points within different areas. It assumes the image has an overlay and the points are the first element of the overlay and the areas are the remaining elements.
Overlay.activateSelection(0);
if (selectionType!=10)
exit("1st element of overlay must be point");
getSelectionCoordinates(x, y);
counts = newArray(Overlay.size-1);
for (i=1; i<Overlay.size; i++) {
Overlay.activateSelection(i);
for (j=0; j<x.length; j++) {
if (selectionContains(x[j],y[j]))
counts[i-1] += 1;
}
print("Area "+i+" contains "+counts[i-1]+" points");
}
Here is the output from running the macro on the attached image:
Area 1 contains 4 points
Area 2 contains 2 points
Area 3 contains 2 points
Area 4 contains 0 points
Here is the output of the Image>Overlay>List Elements command (requires v1.48a or later):
0 null Point 114 94 226 196 yellow none 0 0 0 0 0
1 null Oval 68 61 190 209 yellow none 0 0 0 0 0
2 null Oval 217 124 168 145 yellow none 0 0 0 0 0
3 null Oval 135 22 279 126 yellow none 0 0 0 0 0
4 null Oval 81 337 250 56 yellow none 0 0 0 0 0
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