Image capture using webcam
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Prateek
il 16 Apr 2011
Modificato: Walter Roberson
il 16 Mag 2020
I am using matlab for capturing image using a webcam(company-Labtec) whenever i get a snapshot the image appears Red.How should i overcome this problem?
Also how can I increase the shuter exposore time of the webcam?
OS-Windows XP
3 Commenti
Chaitanya Panse
il 27 Mag 2018
Modificato: Chaitanya Panse
il 27 Mag 2018
The problem with my GUI is that whenever i connect an external webcam and run in GUI the axis becomes very small that it is hardly seen. How do i overcome this problem? Please help.
Risposta accettata
David Tarkowski
il 20 Apr 2011
I'm going to guess that the problem is the color space that your camera returns data in is not RGB. This is common for a lot of webcams. The commands commonly used to display images such as image or imshow expect RGB data. If you pass in YCbCr (or YUV) data, the result is an image that looks vaguely correct but has a pink and green hue to it.
There are a number of ways to work around this, but in your case, I suspect that the easiest will be to change the ReturnedColorSpace property of the videoinput object:
vid = videoinput('winvideo', 1);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid);
imshow(img)
9 Commenti
Image Analyst
il 1 Ago 2017
Try this:
>> ver
>> which getsnapshot
What does it say? You probably don't have the Image Acquisition Toolbox installed.
Più risposte (5)
Mark Jones
il 25 Apr 2011
Modificato: John Kelly
il 13 Nov 2013
Alternatively, it may be that your camera needs to warm up. To allow for this, try using manual triggering and GETSNAPSHOT.
0 Commenti
Ian
il 7 Lug 2014
I got this to work, but is there a way to then read that image? Like to call it back so matlab can analyze it?
6 Commenti
Antonio Meza
il 5 Nov 2015
Thank you!! it works. Finally, i can finish my project. Greetengs from Mexico
finalyear project
il 21 Ott 2016
Tried to take an image using webcam by following code
vid = videoinput('winvideo', 3);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid);
imshow(img)
but still got black image.Can anybody please suggest something?
1 Commento
Syed Aameer
il 1 Feb 2017
attach this code above to to your code axes(handles.axes1);
hImage=image(zeros(80,120,3),'Parent',handles.axes1); preview(vid,hImage);
mohamed hushan
il 5 Ott 2017
Modificato: Walter Roberson
il 16 Mag 2020
vid = videoinput('winvideo', 1);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid); imshow(img)
after that how to save the snap images into folder?
0 Commenti
Shrey Garg
il 16 Mag 2020
webcam not working in matlab
it opensup logitech webcam nut it doesnot works and displays message that application already opened
0 Commenti
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