File Exchange

image thumbnail

ccfun.m

version 1.0.0.0 (1.64 KB) by Herbert
Apply a function to connected components in one or more images

124 Downloads

Updated 19 Jun 2014

View License

ccfun Apply a function to connected components in one or more images

S = ccfun(fun, cc, I) applies fun to each connected component in cc and
I. I is a MxNxC matrix, typically C=1 or C=3 for RGB, and cc is a cell
where each element defines the indices of one connected component. That
is:

S(i) = fun(I(cc_x(i), cc_y(i), :))
where [cc_x(i), cc_y(i)] = ind2sub(size(I), cc{i});

S = ccfun(fun, cc, I1, ..., In) Similar, but now

S(i) = fun(I1(cc_x(i), cc_y(i), :), ..., In(cc_x(i), cc_y(i), :))

For efficiency this function uses no for-loops.

The application of the function is done using cellfun and cell2mat, fun
must return a uniform output.

Example:
I = rand(100, 100); % Some image
cc = {randi(100*100, 20, 1)}; % A conneted component with 20 pixels,
% probably not really connected ;)
cellfun(@(x) sum(x), cc, I)

ans =

13.0654

sum(I(cc{1}))

ans =

13.0654

Author: Herbert Kruitbosch
Copyright: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
http://creativecommons.org/licenses/by-nc-nd/4.0/

If you want to change and share something in the script, e-mail me an
updated version and I may consider it.

Cite As

Herbert (2021). ccfun.m (https://www.mathworks.com/matlabcentral/fileexchange/47004-ccfun-m), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2013b
Compatible with any release
Platform Compatibility
Windows macOS Linux

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!