MATLAB camera gives dark image.?

 clear all;clc
a = imaqhwinfo;
[camera_name, camera_id, format] = getCameraInfo(a);
vid = videoinput(camera_name, camera_id, format);
set(vid, 'ReturnedColorSpace', 'RGB');
%vid = videoinput('winvideo',1, 'YUV2_1280x720')
img = getsnapshot(vid);

When i capture image from this writtern code, it captures image immediately, and not giving time for camera to set its resolution and image seems black and dark.

How to give some time to camera for waiting to capture good image..?

Answer 1

[Image Analyst]

Either set the exposure:

src = getselectedsource(vidobj);
src.Exposure = newValue; % Make it higher for brighter images.

Or open up the iris diaphragm, if the camera lens has one.

[Nimisha]

I am not getting any Exposure Option, I am getting only following options. I tried to set

 Framerate = 90.

But still image being captured immediately, and camera not getting good exposure time to clear image.

 General Settings:
        Parent = [1x1 videoinput]
        Selected = on
        SourceName = input1
        Tag = 
        Type = videosource

      Device Specific Properties:
        BacklightCompensation = on
        Brightness = 0
        Contrast = 33
        FrameRate = 30.0000
        Gamma = 100
        Hue = 0
        Saturation = 62
        Sharpness = 3
        WhiteBalance = 4000
        WhiteBalanceMode = auto

[Image Analyst]

Maybe try reducing the frame rate to collect more light. Or bump up the brightness value to add an offset to the image. Or change the Gamma to 240 or something.

[Nimisha]

i did not know what is the code syntax to change frame rate

[Image Analyst]

Try

src.FrameRate = 10;

or whatever you used. Maybe you called it input1 instead of src, if so use input1.FrameRate = 10.