How to update a background model in motion detection

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Lora
Lora 2014-4-14
评论： Lora 2014-4-14
Hi I am implementing an equation for my abckground model. I have its mathematical form and i believed i implemented it on MTALAB but there seems to be a problem. Either there is some thing missing in my synatx so i was wondering if any one out there can ahve a lookl and correct mr or guide me. Basically what it does is the if equation get satisifes it fills 1on that location (1 in image pixel) else it put 0 in that location.This is my equation
imageGray-meanofIMage>3max(imageVariance,cameranoiseVariance)
if true
if(abs(imGray(row_loop,col_loop)-state.meanIm(row_loop,col_loop))>(3*max((state.varIm(row_loop,col_loop)),state.cameraNoiseVar)))
relutantIm=1;
else
resultantIm=0;
end
Now what i recieve is image that contains all zeros where as it should have some 1 i am sure about that.My values are right since i have a refrence to cross check it i believe something is wrong with my syntax.
Any helps are appreciated

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采纳的回答

Image Analyst
Image Analyst 2014-4-14
编辑：Image Analyst 2014-4-14
You want resultantIm to be an entire image, right? Not just one number? So do this:
resultantIm = abs(imGray-state.meanIm) > 3*max(state.varIm,state.cameraNoiseVar);
No need for looping over row_loop and col_loop. You can do it all in one line. resultantIm is a logical (binary) image - 0 or 1, or false or true.
To get the masked foreground
foregroundImage = imGray; % Initialize
foregroundImage(~resultantIm) = 0; % Blacken background.
To get the background image:
backgroundImage = imGray; % Initialize
backgroundImage(resultantIm) = 0; % Blacken foreground.

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