optimization of Webcam livestream with overlays and keyboard button actions (low FPS, high CPU-Load)

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Tommy Schumacher 2021-6-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/850475-optimization-of-webcam-livestream-with-overlays-and-keyboard-button-actions-low-fps-high-cpu-load

编辑： Tommy Schumacher 2021-6-21

Hi, i have a FullHD USB-Webcam and have performance problems with the FullHD-livestream with overlays and keyboard button actions. The stream has low fps, very high CPU-Load and sometimes the stream freezes. Can you please help me and give me tips on what the problem is?

% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
% ----------------------- launch live stream ------------------------------%
  % get cam 1
  try
    params.cam = webcam(1);                 % uncomment only for test on laptop (HD-Ready Webcam)
    params.cam.Resolution = '1280x720';
%     params.cam = webcam(2);               %uncomment for FullHD USB-Webcam
%     params.cam.Resolution = '1920x1080';
  catch
    disp('active session already exist for cam 1')
  end
% some code stuff...
%...
  
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
% ----------------------- infinite loop for livestream --------------------%
  while true
    pause(0.001)
    params = get_params();
      
    try
      livestream_overlays(params);
    catch
      break;
      close all;
      pause(0.001)
    end
  end
  
  close all
  pause(0.001)
  
% some code stuff...
%...
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
% ----------------------- Live Stream functions ---------------------------%
function livestream_overlays(params)
  % - set yellow line and number of sheets as overlays
  params = overlay_base(params);
  % - set red lines as overlays
  if params.state == 1 || params.state == 2
    params = overlay_red(params);
  elseif params.state == 3
    params = overlay_blue(params);
  end
  % - set green lines as overlays
  if params.lvalue
    params = overlay_green(params);
  end
  % - show live stream frame with overlays
  set(params.aximg, 'CData', params.img);
  if params.spsn == 1
    set(params.aximg2, 'CData', params.img2);
  end
  
% some code stuff...
%...