Live video to frames, detect people

Question

Han 2018-3-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385697-live-video-to-frames-detect-people

评论： Image Analyst 2018-3-2

在 MATLAB Online 中打开

Hi all

I'm trying to write a program to detect people who are wearing white things .. whatever it's.

I faced difficult to convert live video to frames so I compare it with background !

Code:

    function ForMe_OpeningFcn(hObject, eventdata, handles, varargin)
    vid = videoinput('winvideo',1);
    handles.video = vid;
    set(handles.video,'TimerPeriod', 0.05, ...
    'TimerFcn',['if(~isempty(gco)),'...
    'handles=guidata(gcf);'...
    'image(getsnapshot(handles.video));'... 
    'set(handles.axes1,''ytick'',[],''xtick'',[]),'... 
    'else '...
    'end']);
    set(vid,'FramesPerTrigger',1);
    %vid.FrameGrabInterval = 2;
    set(vid,'TriggerRepeat',Inf);
    triggerconfig(vid, 'Manual');
    handles.output = hObject;
    guidata(hObject, handles);
    uiwait
    % --- Executes on button press in pushbutton1.
    function pushbutton1_Callback(hObject, eventdata, handles)
    vid = handles.video;
    start(vid);
    trigger(vid);
    BackgroundImage = getsnapshot(vid);
    I1 = rgb2gray(BackgroundImage);
    figure;
    subplot(2,2,1);
    imshow(I1);
    title('background');
    pause(2); 
    while 1
    frames = getdata(vid); 
    I2 = rgb2gray(frames);
    subplot(2,2,2);
    imshow(I2);
    title('frames');
    pause(2);   
    Objects = I1 ~= I2;  
    BlobAnalysis = vision.BlobAnalysis('MinimumBlobArea',20000,'MaximumBlobArea',40000);
    [area,centroid,BoundingBox] = step(BlobAnalysis,Objects);
    [row , col ] = size (BoundingBox);
    for i=1 : row
    x = BoundingBox(i,1);
    y =BoundingBox(i,2);
    w=BoundingBox(i,3);
    h=BoundingBox(i,4);
    TestImage = frames(y :(y+h),x:(x+w), :);
    r = TestImage(:,:,1);
    g = TestImage(:,:,2);
    b = TestImage(:,:,3);
    subplot(2,2,3);
    title('Histogram');
      histogram2(r,g,'DisplayStyle','tile','ShowEmptyBins','on', ...
        'XBinLimits',[0 255],'YBinLimits',[0 255]);
    histogram(r,'BinMethod','integers','FaceColor','r','EdgeAlpha',0,'FaceAlpha',1)
    hold on
  histogram(g,'BinMethod','integers','FaceColor','g','EdgeAlpha',0,'FaceAlpha',0.7)
  histogram(b,'BinMethod','integers','FaceColor','b','EdgeAlpha',0,'FaceAlpha',0.7)
    xlabel('RGB value')
    ylabel('Frequency')
    title('Color Histogram')
    xlim([0 257])
    thresholding = 2097150;
    rth=graythresh(TestImage(:,:,1))*255
    gth=graythresh(TestImage(:,:,2))*255
    bth=graythresh(TestImage(:,:,3))*255
    if ( rth*gth*bth >= thresholding )
     % Ishape = insertShape(object,'rectangle',BoundingBox,'Color', 'green','Linewidth',6);
    msgbox('Alarm it is white !');
    load gong.mat;
     while ( rth*gth*bth >= thresholding)%endless loop
         sound(y);
         lastTime = clock;
         while etime(clock, lastTime) < 5
            pause(0.03);
         end
        break;
     end
    else
        msgbox('ok');
    end
    clear TestImage;
    end
    end
    % --- Executes on button press in pushbutton2.
    function pushbutton2_Callback(hObject, eventdata, handles)
    vid = handles.video;
    stop (vid);
    guidata(hObject, handles)

Errors:

Error event occurred at 00:17:26 for video input object: MJPG_1280x720-winvideo-1.
GETDATA timed out before FRAMES were available.
Error using imaqdevice/getdata (line 148)
GETDATA timed out before FRAMES were available.
Error in ForMe>pushbutton1_Callback (line 87)
frames = getdata(vid);
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in ForMe (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)ForMe('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) 
Error using uiwait (line 81)
Error while evaluating UIControl Callback
Struct contents reference from a non-struct array object.
Error in ForMe>ForMe_OutputFcn (line 71)
varargout{1} = handles.output;
Error in gui_mainfcn (line 264)
        feval(gui_State.gui_OutputFcn, gui_hFigure, [], gui_Handles);
Error in ForMe (line 42)
    gui_mainfcn(gui_State, varargin{:});

Thank you ..

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Answer 1

Image Analyst 2018-3-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385697-live-video-to-frames-detect-people#answer_307839

It looks like your camera is not sending video, perhaps because you set your trigger to manual. I don't have any experience with manual triggering. I don't use it, I just let the camera run all the time and call getsnapshot() to grab a frame from the live video.

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Han 2018-3-1

在 MATLAB Online 中打开

Thank you for your answer ..

I delete this satement

triggerconfig(vid, 'Manual');

and I get this error:

Error event occurred at 00:52:05 for video input object: MJPG_1280x720-winvideo-1.
Unable to allocate memory for an incoming image frame due to insufficient free physical memory.
Error in ForMe>pushbutton1_Callback (line 91)
pause(1);