How to find connected components ?

I am using bwconncomp() to find the connected components in an image.But,I get error.What can I do to rectify it?

Error:

Error using imageDisplayValidateParams

Expected input number 1, I, to be one of these types:

double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64, logical

Instead its type was struct.

Error in images.internal.imageDisplayValidateParams (line 11)

validateattributes(common_args.CData, {'numeric','logical'},...

Error in images.internal.imageDisplayParseInputs (line 78)

common_args = images.internal.imageDisplayValidateParams(common_args);

Error in imshow (line 245)

images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});

Error in shitomashi1 (line 70)

figure,imshow(cc);

bwim1=adaptivethreshold(I,11,0.03,0);
figure,imshow(bwim1);
cc=bwconncomp(bwim1);
figure,imshow(cc);

Answer 1

[Shunichi Kusano]

The error seems to come from "imshow" function, since cc is not an image, but a structure.

You need to convert cc to labelimage by "labelmatrix", then show it by "imshow".

The following URL is helpful:

https://www.mathworks.com/help/images/correcting-nonuniform-illumination.html

[ezhil K]

How should I use the code in the link.I don't understand.Can u please help me?

[Shunichi Kusano]

This is one example:

labeled_image = labelmatrix(cc); % labeling each compoent 
RGB_label = label2rgb(labeled,'spring','c','shuffle'); % colorization
imshow(RGB_label) % visualization

To see one of the connected component, please command like this:

A = false(size(bw)); % zero image
grain(cc.PixelIdxList{1}) = true; % input one to the area of the 1st component
imshow(grain) % visualization

hope this works.