MATLAB: Regionprops fails to identify binary image – ERROR

binaryimage analysisimage processingimage segmentationMATLAB

So I have a 'logical-binary' image I would like to perform region props on. The image consists of what you expect, 0's and 1's only. However, when I try to run regionprops on the image, all the centroids and Diameters are listed as NaN. Does the image need to be in a different format?

Thanks

Best Answer

The help says the input must be a logical array - i.e. type logical, not just 0s and 1s in any data type.

Related Solutions

MATLAB: Regionprops

Try this for a start:

img = zeros(5,5);
img(2:4, 2:4) = 1;
props = regionprops(img, 'PixelList');
disp(img);
disp(props.PixelList);

You can change the pattern of ones in img until you're clear about how the result is structured. Another simple but informative example:

img = zeros(5,5);
img(2,2) = 1;
img(4,4) = 2;
props = regionprops(img, 'PixelList');
disp(props(1).PixelList);
disp(props(2).PixelList);

MATLAB: RegionProps

I = rand(100)>.75; %sample binary image
CC = bwconncomp(I);  %Connected Components Analysis
stats = regionprops(CC,'area','eccentricity');  %regionprops
idx = [stats(:).Area]>10&[stats.Eccentricity]<0.4; 
%logical indices corresponding to area > 10 and eccentricity <0.4.

Do what you what you want with CC,idx; all of the information is there.

Best Answer

Related Solutions

MATLAB: Regionprops

MATLAB: RegionProps

Related Question