How to remove time lag and multiple centroid in this code?

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The cursor does not follows red color properly and it detects white and various other color also. currently i am doing virtual mouse using color detection. this is code please help.
clear all
close all
clc
import java.awt.Robot
m=Robot;
v=videoinput('winvideo',1,'YUY2_640x480');
set(v,'ReturnedColorSpace','YCbCr');
v.FramesPerTrigger=inf;
v.FrameGrabInterval=1;
pause(1)
while (v.FramesAcquired<=35)
i=getsnapshot(v);
% i=imresize(i,2);
% imtool(im_resized)
first_comp=i(:,:,1);
% imtool(first_comp)
rgb_2_gray=rgb2gray(i);
% imtool(rgb_2_gray)
d=first_comp-rgb_2_gray;
% imtool(d)
b=im2bw(d,.1);
bw=bwareaopen(b,500);
imshow(bw);
hold on;
% end;
% % bw=bwlabel(bw,8);
% % imtool(bw)
p=regionprops(bw,'centroid');
for z=1:length(p)
a=p(z).Centroid;
plot(a(1),a(2),'r*');
m.mouseMove(a(1),a(2));
end;
end;
  1 Comment
Matt J
Matt J on 26 Sep 2014
For your reference, your code is now much more readable because I applied this formatting button to it,

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Accepted Answer

Image Analyst
Image Analyst on 26 Sep 2014
It's just not a very robust color segmentation algorithm. You might be better off going to hsv color space. See my File Exchange. However one of the methods I use there does find red objects in RGB color space. http://www.mathworks.com/matlabcentral/fileexchange/26420-simplecolordetection
  2 Comments
Rohit Dixit
Rohit Dixit on 27 Sep 2014
This link was very helpful to understand quickly now will be able to detect green and blue color and perform clicking accordingly.
Image Analyst
Image Analyst on 27 Sep 2014
I just looked at it. It's not any more robust than yours was - in fact it's pretty much the same algorithm. Well, whatever, if it works in your specific situation, then fine.

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More Answers (1)

Rohit Dixit
Rohit Dixit on 27 Sep 2014
Thank you sir good to know. I will improve the robustness in code.

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