CODE TOO SLOW AND SOMETIMES WONT RUN

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Ayesha ayub
Ayesha ayub on 19 Oct 2014
Edited: per isakson on 20 Oct 2014
i have made a code for motion detection in real time but its too slow and sometimes wont even run why?
here's my code :
clear all
clc
imaqmem(999999999);
threshold= 0.5;
frame=0;
video= videoinput('winvideo',1,'YUY2_1280x1024'); %creating video object
start(video) %initiliazing video
first_frame = getsnapshot(video);
first_frame_gray=rgb2gray(first_frame);
[row,column,page]=size(first_frame);
dummy_matrix = zeros(row,column);
while(frame<50)
current_frame=getsnapshot(video);
current_frame_gray= rgb2gray(current_frame);
frame_difference=imabsdiff(current_frame_gray,first_frame_gray);
for nr=1:row
for nc=1:column
% if fr_diff > thresh then that pixel is in foreground
if ( (frame_difference(nr,nc) > threshold))
dummy_matrix(nr,nc) = frame_difference(nr,nc);
else
dummy_matrix(nr,nc) = 0;
end
end
end
first_frame_gray= current_frame_gray;
subplot(2,1,1)
imshow(current_frame)
subplot(2,1,2)
imshow(uint8(dummy_matrix))
frame=frame+1;
end
flushdata(video)
delete(video)

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Answers (2)

per isakson
per isakson on 19 Oct 2014
Edited: per isakson on 19 Oct 2014
Image Analyst
Image Analyst on 19 Oct 2014
I do frame differencing in my demo. Run it and compare how it works to how yours works. The only difference is I get from frames from a video file instead of a camera, and I subtract the current frame from the average of several other frames instead of the latest one.

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