I have written a code for finding centroid of connected components of an image and it gives an error.I tried to debug it but couldn't get a clue.How to solve that?

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Prachi Sharma
Prachi Sharma 2016-10-25
编辑： Prachi Sharma 2016-10-25
So, the given is my code below.I need to find out the centroid of the connected components and it doesn't work.Also,I am supposed to save these centroids and I couldn't save it.The error that the gives is also given below- %%Computing Background Markers
bw = im2bw(Iobrcbr);
%compute connected components
CC=bwconncomp(bw);
lab=labelmatrix(CC);
%% FINDING CENTROID OF CONNECTED COMPONENTS(need to work on lab)
s=regionprops(lab,'centroid');
centroids=cat(1, s.Centroid);
figure
imagesc(lab)
hold on
plot(centroids(:,1),centroids(:,2), 'b*');
hold off
ERROR-Index exceeds matrix dimensions.
Error in actual (line 92) plot(centroids(:,1),centroids(:,2), 'b*');
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Prachi Sharma
Prachi Sharma 2016-10-25
编辑：Prachi Sharma 2016-10-25
It worked fine for one video,for other videos it is just not working fine.Here is my complete code- %% VIDEO FRAMES
close all clear all
vidobj=VideoReader('clouds.mp4');
%frames=vidobj.Numberofframes;
Frame_No=vidobj.NumberOfFrames;
%for i=1:Frame_No
for i=1:5
imwrite(read(vidobj,i),strcat('C:\Users\Narendra Singh\Documents\MATLAB\Cloudframes\',num2str(i),'.png'))
end
%% WATERSHED SEGMENTATION
%%CONVERTING COLOR IMAGE TO GRAY IMAGE
for i=1:5
rgb=imread(strcat('C:\Users\Narendra Singh\Documents\MATLAB\Cloudframes\',num2str(i),'.png'));
a=imresize(rgb,[512 512]);
I=rgb2gray(a);
%%FINDING THE GRADIENT OF THE IMAGE
hy=fspecial('sobel');
hx=hy';
Iy=imfilter(double(I), hy, 'replicate');
Ix=imfilter(double(I), hx, 'replicate');
gradmag=sqrt(Ix.^2 + Iy.^2);
%% %%Marking the Foreground Objects
se=strel('disk',10);
Io=imopen(I, se);
%%
%%Computing the opening-by-reconstruction using imerode and imreconstruct.
Ie = imerode(I, se);
Iobr = imreconstruct(Ie, I);
%%
%%Following the opening with a closing to remove the dark spots and stem mark
Ioc = imclose(Io, se);
%%
%%Using imdilate followed by imreconstruct
Iobrd = imdilate(Iobr, se);
Iobrcbr = imreconstruct(imcomplement(Iobrd), imcomplement(Iobr));
Iobrcbr = imcomplement(Iobrcbr);
%% Calculate the regional maxima of Iobrcbr to obtain good foreground markers
fgm = imregionalmax(Iobrcbr);
%%
%%Superimpose the foreground marker image on the original image.
I2 = I;
I2(fgm) = 200;
%%
%%cleaning the edges of the marker blobs and then shrinking them a bit.
se2 = strel(ones(2,2));
fgm2 = imclose(fgm, se2);
fgm3 = imerode(fgm2, se2);
fgm4 = bwareaopen(fgm3,200);
I3 = I;
I3(fgm4) = 255;
%%
%%Computing Background Markers
bw = im2bw(Iobrcbr);
%% CONNECTED COMPONENTS %compute connected components CC=bwconncomp(bw);
lab=labelmatrix(CC);
%% FINDING CENTROID OF CONNECTED COMPONENTS(need to work on lab)
s=regionprops(lab,'centroid');
centroids=cat(1, s.Centroid);
figure
imagesc(lab)
hold on
plot(centroids(:,1),centroids(:,2), 'b*');
hold off
end

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