taking input from two cameras at a same time in Matlab

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Hashem Burki
Hashem Burki el 9 de Mayo de 2011
Comentada: Thao Pham el 25 de Mzo. de 2020
how can i use and take input from two cameras at the same time?

Respuesta aceptada

David Tarkowski
David Tarkowski el 11 de Mayo de 2011
In general working with two cameras is the same as working with a single camera. You create a videoinput object for each device that you wish to capture from and the call start on each device:
vid1 = videoinput('winvideo', 1);
vid2 = videoinput('winvideo', 2);
start([vid1 vid2]);
These devices will be started at roughly the same time, but will not by synchronized due to delays imposed by the operating system and drivers in actually starting them. To synchronize multiple devices precisely, you generally need to use devices that support hardware triggering.
  5 comentarios
Image Analyst
Image Analyst el 15 de Feb. de 2013
You need to give it a handle to an image object:
axes(handles.axes1);
handleToImageInAxes1 = image(zeros(800,600));
% Turn on the live video.
preview(vidobj, handleToImageInAxes1);
axes(handles.axes2);
handleToImageInAxes2 = image(zeros(800,600));
% Turn on the live video.
preview(vidobj, handleToImageInAxes2);
Tiago
Tiago el 15 de Feb. de 2013
I did like this:
vid1 = videoinput('linuxvideo',1);
vid2 = videoinput('linuxvideo',2);
handles.axes1 = subplot(1,2,1);
axes(handles.axes1);
handleToImageInAxes1 = image(zeros(800,600));
preview(vid1, handleToImageInAxes1);
handles.axes2 = subplot(1,2,2);
axes(handles.axes2);
handleToImageInAxes2 = image(zeros(800,600));
preview(vid2, handleToImageInAxes2);
and still the same error at the second preview. Any idea?

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Más respuestas (3)

Hassan Mehmood Khan
Hassan Mehmood Khan el 17 de Sept. de 2017
i did this to get snapshot from two cams at same time:
% webcamlist identification
clc;
clearvars;
webcamlist
cam=webcam;
cam2=webcam(2);
cam.AvailableResolutions;
cam2.AvailableResolutions;
cam.Resolution='640x480';
cam2.Resolution='640x480';
% preview(cam);
% preview(cam2);
img=snapshot(cam);
img2=snapshot(cam2);
img3=snapshot(cam);
img4=snapshot(cam2);
figure;
subplot(3,3,1);
imshow(img3);
subplot(3,3,2);
imshow(img4);
output
ans =
'Webcam C170'
'Logitech HD Webcam C270'

Andrei
Andrei el 2 de Jun. de 2018
Also refer to the following example which uses Parallel Computing Toolbox with Image Acquisition Toolbox

Walter Roberson
Walter Roberson el 9 de Mayo de 2011

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