What is the simplest most effective way to motion detect using webcams ?

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Lobna 2013-4-13

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评论： Image Analyst 2014-3-31

For a while now I've been searching reading and trying out some of the open source out there. With not much background in Matlab.

I'm trying to write a motion detection code based on background subtraction or temporal difference methods. And since my lack of experience when I read papers and mathematical equations I can't implement it into code and when I read source codes I can't really understand what goes on underneath.

Could you kindly point me out in the right direction. What is the best way to motion detect for a Security/ Alarm system so it needs to be fast and uninfected by noise other that intruders for closed spaces? And how can I implement it while I still understand every single line of the code?

Thank you

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Answer 1

Anand 2013-4-13

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This one might be relevant to you:

http://www.mathworks.com/help/vision/examples/scene-change-detection.html

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Lobna 2013-4-15

Thank you

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Answer 2

Image Analyst 2013-4-13

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The Mathworks web site has many pages on tracking. Most are short demos that involve the Computer Vision System Toolbox or the Image Processing Toolbox or Image Acquisition Toolbox. Do a search: http://www.mathworks.com/searchresults/?q=tracking&q1=tracking&q2=&q3=&notq=&c[]=productsservices&c[]=solutions_tn

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Ankur Singh 2014-3-31

hey image analyst

in optical flow method what tells us that some motion has been detected??

Image Analyst 2014-3-31

The vector field will be non-zero where there has been motion.

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Answer 3

tairman singh 2013-4-18

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在 MATLAB Online 中打开

try this function function [logic]=mcheck(f,s)

sub=imabsdiff(f,s);

diff_im=im2bw(sub,.07);

diff_im = medfilt2(diff_im, [3 3]);

diff_im = bwareaopen(diff_im,500);

imbw = imfill(diff_im,'holes');

[a b c]=size(imbw);

count=im2col(imbw,[a b],'sliding');

count=sum(count);

if count<=3000

logic=1;

else

logic=0;

end

it takes two consecutive images clicked by the camera, as the input function parameters i.e 'f' and 's' and return logic '1' or '0' if it detect motion or not. Changing different values of count ,allows you to control the sensitivity.