Take coordinate data from struct, throw it into an array. Why is this hard to find info about?

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Matthew Powell
Matthew Powell 2015 年 2 月 16 日
編集済み: Ashish Uthama 2015 年 2 月 17 日
I'm working on an image processing program that takes coordinate data of objects in an image acquired via the command regionprops and throws it into an array (that I will grab with a C program).
I'm having no issue sorting singular values into an array, but I am failing to put the coordinate data into one, which looks like [x,y].
code snippet:
blobMeasurements = regionprops(labeledImage, i, 'all'); %labeledImage has object information
numberOfBlobs = size(blobMeasurements, 1);
Centroid = size(blobMeasurements, ???);
g = 1;
n = 1;
for n = 1:97
if (blobMeasurements(n).Area > 500)
Centroid(g) = blobMeasurements(n).Centroid;
g = g + 1;
All I need is a simple set of lines that can achieve this. For the record, this isn't a homework assignment.


Ashish Uthama
Ashish Uthama 2015 年 2 月 17 日
編集済み: Ashish Uthama 2015 年 2 月 17 日
Does this help? (If not, use this example code to show how you want your Centriod variable to look like)
stats = regionprops(im2bw(imread('coins.png')),'all');
%%Indices of 'larger' areas
% The key here is using [] to capture the output of stats.Area into an
% array.
inds = [stats.Area]>1000;
%%Centroids, using logical indexing
% This gives you the data in [x1 y1 x2 y2 ....] format
centroids = [stats(inds).Centroid];
[EDIT - add table syntax] With the latest version, regionprops now supports tables, making it even more easier:
stats = regionprops('table',im2bw(imread('coins.png')),'all');
inds = stats.Area>100;
centroids = stats.Centroid(inds,:);
  1 件のコメント
Matthew Powell
Matthew Powell 2015 年 2 月 17 日
Yes that works excellently. I also managed to get it to work by right clicking the struct field to create a cell array, and the function was auto-written at the command line. Much appreciated!


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