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what does allcentroids do?

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noha maabreh
noha maabreh 2015-5-5
评论： Walter Roberson 2015-5-8
allAreas = [measurements.Area];
allPerimeters = [measurements.Perimeter];
allCentroids = [measurements.Centroid];
centroidX = allCentroids(1:2:end);
centroidY = allCentroids(2:2:end);
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Walter Roberson
Walter Roberson 2015-5-8
That looks like code I might have written ;-)
Note that in the above, "allCentroids" is just another variable name, not the name of a command or function call. What will be stored in that variable is as the others have described below.

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Jeff E
Jeff E 2015-5-5
This is pulling the various measurements (Area, Perimeters, Centroid coordinates) out of the cell array measurements, and putting them into arrays. allCentroids will contain the centroid X and Y coordinates concatenated together along the lines of: ROI_1_Xcoord ROI_1_Ycoord ROI_2_Xcoord ROI_2_Ycoord ...
By taking every other element of allCentroids, centroidX contains the X coordinates, while centroidY contains the Y coordinates.
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Jeff E
Jeff E 2015-5-5
If your image has two ROIs with centroid XY coordinates as follows:
ROI1 - 50x 60y
ROI2 - 100x 120y
Then allCentroids would be an array containing: [50 60 100 120]

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