how to speed up tracking object code ????
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From: No0o0oR on 8 May 2010 16:18 hello friends, i am doing a project regarding tracking objects using real time video and i am having some issues. it seems that the tracking slows down after a while and i don't know how to track multiple objects in the video i am only able to detect one object at a time.. please any suggestions on how to speed up my tracking and how to be able to track multiple objects .. this is my code .. vidobj=videoinput('winvideo',1, 'YUY2_320x240'); triggerconfig(vidobj, 'manual'); frame = getsnapshot(vidobj); bg=rgb2gray(frame); fr_size = size(frame); width = fr_size(2); height = fr_size(1); question=9; while (question ~='q') frame1 = getsnapshot(vidobj); frame1_bw = rgb2gray(frame1); fr_diff = abs(double(frame1_bw) - double(bg)); x1=0; x2=width; y1=0; y2=height; fg = zeros(height, width); xmid=0; ymid=0; for j=1:width % if fr_diff > thresh pixel in foreground for k=1:height if ((fr_diff(k,j) > 25)) %check if the pixel is moving or fixed fg(k,j) = 255; % detect rectangle coordinates if(j<x2) x2=j; end x1=j; %min x y1=k; %max y if(k<y2) y2=k; end % shooting point coordinates ************************** xmid=(x1+x2)/2; % x coordinate for the shooting point ymid=(y1+y2)/2; % y coordinate for the shooting point w=x1-x2; % width of the contour rectangle h=y1-y2; % height of the contour rectangle %****************************************************** % to avoid having width and height = 0 and get an error if(w<1) w=1; end if(h<1) h=1; end %****************************************************** % if the object went out ro the region, center the sniper if((xmid<2)||(xmid>width)) xmid=width/2; ymid=height/2; end if((ymid<2)||(ymid>height)) xmid=width/2; ymid=height/2; end %******************************************************** else fg(k,j) = 0; end end end imshow(frame1_bw) hold on; plot(xmid,ymid,'rx','MarkerSize',10) % draw shooting point rect=rectangle('Position', [x2 y2 w h]); % draw contour rectangle set(rect,'EdgeColor','y','LineWidth',2); uicontrol('String', 'Start',... 'Callback', 'start(vidobj)',... 'Units', 'normalized',... 'Position',[0 0 0.15 0.07]); uicontrol('String', 'Stop',... 'Callback', 'stop(vidobj)',... 'Units', 'normalized',... 'Position',[0.17 0 0.15 0.07]); end
From: No0o0oR on 9 May 2010 12:03 "No0o0oR " <n.khaznadar(a)live.com> wrote in message <hs4gtt$171$1(a)fred.mathworks.com>... > hello friends, > > i am doing a project regarding tracking objects using real time video and i am having some issues. it seems that the tracking slows down after a while and i don't know how to track multiple objects in the video i am only able to detect one object at a time.. > > please any suggestions on how to speed up my tracking and how to be able to track multiple objects .. > > this is my code .. > > > vidobj=videoinput('winvideo',1, 'YUY2_320x240'); > triggerconfig(vidobj, 'manual'); > > frame = getsnapshot(vidobj); > bg=rgb2gray(frame); > fr_size = size(frame); > width = fr_size(2); > height = fr_size(1); > > question=9; > while (question ~='q') > > frame1 = getsnapshot(vidobj); > frame1_bw = rgb2gray(frame1); > > fr_diff = abs(double(frame1_bw) - double(bg)); > > x1=0; > x2=width; > y1=0; > y2=height; > fg = zeros(height, width); > xmid=0; > ymid=0; > for j=1:width % if fr_diff > thresh pixel in foreground > for k=1:height > if ((fr_diff(k,j) > 25)) %check if the pixel is moving or fixed > fg(k,j) = 255; > > % detect rectangle coordinates > if(j<x2) > x2=j; > end > x1=j; %min x > y1=k; %max y > if(k<y2) > y2=k; > end > > % shooting point coordinates ************************** > xmid=(x1+x2)/2; % x coordinate for the shooting point > ymid=(y1+y2)/2; % y coordinate for the shooting point > > w=x1-x2; % width of the contour rectangle > h=y1-y2; % height of the contour rectangle > %****************************************************** > % to avoid having width and height = 0 and get an error > if(w<1) > w=1; > end > if(h<1) > h=1; > end > %****************************************************** > % if the object went out ro the region, center the sniper > if((xmid<2)||(xmid>width)) > xmid=width/2; > ymid=height/2; > end > > if((ymid<2)||(ymid>height)) > xmid=width/2; > ymid=height/2; > end > %******************************************************** > > else > fg(k,j) = 0; > > end > end > end > > imshow(frame1_bw) > hold on; > plot(xmid,ymid,'rx','MarkerSize',10) % draw shooting point > > rect=rectangle('Position', [x2 y2 w h]); % draw contour rectangle > set(rect,'EdgeColor','y','LineWidth',2); > > uicontrol('String', 'Start',... > 'Callback', 'start(vidobj)',... > 'Units', 'normalized',... > 'Position',[0 0 0.15 0.07]); > uicontrol('String', 'Stop',... > 'Callback', 'stop(vidobj)',... > 'Units', 'normalized',... > 'Position',[0.17 0 0.15 0.07]); > > > > end where are you guys !!!!!!!!!!!!!!
From: Yair Altman on 9 May 2010 12:34 "No0o0oR " <n.khaznadar(a)live.com> wrote in message > where are you guys !!!!!!!!!!!!!! We're all waiting for your $1000 check before answering... Seriously, who do you think you are, taking this tone?! Less than 24 hours of *WEEKEND* have passed since you posted the question - do you think we have no life and are just waiting around to answer questions like yours on our free weekend time? When you start treating other people's time and effort respectfully, perhaps you will get respectful answers in return.
From: dpb on 9 May 2010 12:58 No0o0oR wrote: .... > where are you guys !!!!!!!!!!!!!! expletive_word_of_choice'ing off, apparently... :( <plonk> --
From: Steven Lord on 9 May 2010 22:56
"No0o0oR " <n.khaznadar(a)live.com> wrote in message news:hs6mbo$m94$1(a)fred.mathworks.com... > "No0o0oR " <n.khaznadar(a)live.com> wrote in message > <hs4gtt$171$1(a)fred.mathworks.com>... *snip* > where are you guys !!!!!!!!!!!!!! Relaxing and enjoying the weekend. Here in Natick at least, it's been an okay weekend (Saturday was a bit wet, and today was windy, but it's been worse in the past month.) Anyway, I recommend running your code in the Profiler: help profile to locate the bottlenecks, then work on optimizing them. If you have Code Analyzer warnings in your code (particularly if they're in those sections the Profiler indicated are the bottlenecks) then fix them. http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_env/brqxeeu-151.html -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ |