Is there any way i can speed up my processing?

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Sanjeev 2013-4-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69990-is-there-any-way-i-can-speed-up-my-processing

this is my code for Moving Object detection using both background subtraction and 3frame differencing. But my final output really lags from the heavy processing. Is there any way i can get an output without the lag?

here's my code

%%camera parameters

    clc;
    source = videoinput('winvideo');
    set(source, 'ReturnedColorSpace', 'grayscale');
    set(source, 'FramesPerTrigger', 3);
    set(source, 'TriggerRepeat', 100);
    triggerconfig(source, 'manual');
    start(source);
    thresh = 15/255; 
    trigger(source);
    wait(source,5,'logging')
    bg = getdata(source,1,'double'); 
    bg=bg(:,:,:,1);
    bgfilt=medfilt2(bg);
    %%----------------------- set frame size variables -----------------------%
    fr_size = size(bg);             
    width = fr_size(2);
    height = fr_size(1);
    f1 = zeros(height, width);
    f2 = zeros(height, width);
    flushdata(source)
for i=1:50
      trigger(source)
      wait(source,5,'logging')
      fr = getdata(source,3,'double');
      fr1=fr(:,:,:,1);
      fr2=fr(:,:,:,2);
      fr3=fr(:,:,:,3);             
      fr_diff1 = abs((fr1) - (fr2));  % First frame Difference
      fr_diff2 = abs((fr2) - (fr3));  % Second frame difference 
      bg_fr_diff = abs((double(bg)) - (double(fr1)));
      f1 = 255 * ((bg_fr_diff > thresh));
      f2 = 255 * ((fr_diff1 > thresh) & (fr_diff2 > thresh));
       bg=fr1;
     f=bitand(f1,f2);
     f=medfilt2(f,[5,5]);
subplot(3,1,1);
imshow(uint8(f1));
title('background subtraction');
subplot(3,1,2);
imshow(uint8(f2));
title('Frame differencing');
subplot(3,1,3);
imshow(uint8(outp));
title('AND OUTPUT');
end
stop(source);
delete(source);

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Jan 2013-4-5

Please care about a properly formatted code. You got the instruction in one of your former threads already, therefore I cannot reconsider, why to decide to ignore it. Please note, that ignoring the suggestion of the contributors might cause that they ignore your questions.

Cedric 2013-4-5

Have you profiled your code? If not, use multiple tic/toc or the profiler. I would tend to think that the central part of the FOR loop, which is your part of the processing, is not what takes the most time.

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回答（1 个）

Jan 2013-4-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69990-is-there-any-way-i-can-speed-up-my-processing#answer_81104

编辑：Jan 2013-4-6

在 MATLAB Online 中打开

Use the profile to find the bottleneck of your code at first. It would be senseless to spend time for improving a code sections, which uses 1% of the total processing time.

And, please Sanjeev, care about the suggestions to format your code.

[EDITED] You found out, that the main time is spent in:

fr = getdata(source,3,'double');

Then this is the line, where the most work is done. There is no alternative for this command.