How Do I set Camera Exposure in MATLAB?

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jim 2011-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/4737-how-do-i-set-camera-exposure-in-matlab

评论： KAE 2019-3-11

Hi, I was trying to adjust the exposure for my webcamera, I looked on my image Acquisition toolbox and when i adjust the exposer on there it seems to use the command 'src.Exposure = 10;' (for when you want the exposure to be 10)

I wanted to set my camera exposure to say 20, and i used the same idea but it doesnt seem to work? I tried it for other numbers eg, 60, 100 etc but it seems there is no affect.

Bellow shows the code i am using to test it.

imaqhwinfo ('winvideo', 1);
video = videoinput('winvideo',1,'RGB24_640x480');
src.Exposure = 20; % changes exposure 
preview(video); %Launches video preview window

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Answer 1

Walter Roberson 2011-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/4737-how-do-i-set-camera-exposure-in-matlab#answer_6574

What is src in your code? Do you mean video.Exposure ?

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jim 2011-4-4

编辑：Walter Roberson 2019-3-9

在 MATLAB Online 中打开

Hi, thanks for the reply i used this in the end.

vid = videoinput('winvideo', 1, 'RGB24_640x480');
src = getselectedsource(vid);
vid.FramesPerTrigger = 1;
preview(vid);
src.Exposure = 20;

KAE 2019-3-11

在 MATLAB Online 中打开

If you are having trouble I recommend troubleshooting with imaqtool which will list the command line commands as you change something like the exposure time.

This let me discover that I needed to add a ExposureTimeControl command before I changed the exposure time,

vid = videoinput('winvideo', 1, 'RGB24_640x480'); % Actually a different camera
src = getselectedsource(vid);
src.ExposureTimeControl = 'normal'; % Needed to alter the exposure time
src.ExposureTime = 2.0;

Also the units of ExposureTime are seconds...just mentioning this because it is not specified on the imaqtool GUI.

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