problem in connecting with webcam and re

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Behrad kiani 2013-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/104712-problem-in-connecting-with-webcam-and-re

评论： Image Analyst 2013-11-3

I use this code to take a picture but the picture is very eliminate.but also when I use this command "preview(cam)" on time image is good. what is the problem with the picture?the code is below

cam=videoinput('winvideo' , 2);
set(cam.source , 'Brightness' , 240);
pic=getsnapshot(cam);

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Walter Roberson 2013-11-2

I would not assume that the default video format is RGB. You should find out which formats your camera can return, and select one specifically. Then if necessary, convert colorspaces into something you can display. If the video format is grayscale, make sure you have a grayscale colormap active when you display it.

Behrad kiani 2013-11-3

在 MATLAB Online 中打开

imaqhwinfo('winvideo' , 2)

ans =

          DefaultFormat: 'YUY2_160x120'
    DeviceFileSupported: 0
             DeviceName: 'A4TECH USB2.0 PC Camera'
               DeviceID: 2
      ObjectConstructor: 'videoinput('winvideo', 2)'
       SupportedFormats: {1x5 cell}

>> cam = videoinput('winvideo') >> imaqhwinfo(cam)

ans =

                AdaptorName: 'winvideo'
                 DeviceName: 'Integrated Webcam'
                  MaxHeight: 720
                   MaxWidth: 1280
             NativeDataType: 'uint8'
               TotalSources: 1
    VendorDriverDescription: 'Windows WDM Compatible Driver'
        VendorDriverVersion: 'DirectX 9.0'

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回答（1 个）

Image Analyst 2013-11-3

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104712-problem-in-connecting-with-webcam-and-re#answer_113971

在 MATLAB Online 中打开

Do you have a weird colormap applied? Is the camera running in monochrome mode? Your videoinput() code doesn't look like mine. Mine looks like:

    % Initialize Logitech webcam
    vidobj = videoinput('winvideo', 1, 'RGB24_640x480');
    if ~isempty(vidobj)
      src = getselectedsource(vidobj);
      vidobj.FramesPerTrigger = 1;
      axes(handles.axesImage);
      hImage = findobj(handles.axesImage, 'Type', 'image');
      preview(vidobj, hImage);
    %       src.ZoomMode = 'manual';
      % Turn on the live video preview.  Display the bounding box over it if there is one selected.
      TurnOnLiveVideo(handles); % My own function
    end