getsnapshot

dear matlab....could you please tell how to get rgb image using the function getsnapshot......could you please provide the code

[Robert Cumming]

what have "you" tried.

You will learn more doing it that way (and get better help here) rather than just asking for code...

[Walter Roberson]

Is it part of the requirements that the image be written out to png and that that png then be read in? Or is it only required that the snapshot be taken and the contents of the snapshot be made available in a variable _as if_ it had been read from file?

Answer 1

[Chandra Kurniawan]

Hello,

This is the code. This code will captures images from your webcam.

clear; clc;

a = imaqhwinfo;
camera_name  = char(a.InstalledAdaptors(end));
camera_info    = imaqhwinfo(camera_name);
camera_id        = camera_info.DeviceInfo.DeviceID(end);
resolution        = char(camera_info.DeviceInfo.SupportedFormats(end));
vid                    = videoinput(camera_name, camera_id, resolution);

set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb')
vid.FrameGrabInterval = 5;
start(vid)
i = 1;
while(vid.FramesAcquired <= 200)
    data(:,:,:,i) = getsnapshot(vid);   
    imshow(data(:,:,:,i));    
    drawnow;
    i = i + 1;
end
stop(vid);
flushdata(vid);
vid.TimerFcn = {'stop'};

Then the rgb images will be strored in the variable 'data'.

This program will aquire data for 200 frames.

So, if you want to access frame 1, you can type 'data(:,:,:,1)'.

Try to type 'imshow(data(:,:,:,1)' in the command window when process finished.

[neenu jose]

sir,,i need to take only one image at a time...the image should also be a png rgb image..could you please help me

[neenu jose]

and also....i need to read this image to a variable using imread

[Image Analyst]

imageArray = getsnapshot(vid);

It is a numerical array and doesn't have a format until you save it to disk with imwrite().

You don't need imread() unless you're reading an image stored in a disk file.

[neenu jose]

k....sir thanks a lot..

[neenu jose]

sir.....iam having one more doubt.....iam having a disparity matrix....how can i reconstruct a 3d image.......could you please help me

[Quratulann Ashraf]

sir i am doing video processing using getsnapshoe command in a loop. but this process is really slow...is there any other command to do so or any other way so that i dont get the lag.

looking forward for your reply

Thanks