Image capture using webcam

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Prateek
Prateek 2011-4-16
编辑： Walter Roberson 2020-5-16
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
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Mohan Kant
Mohan Kant 2017-3-12
the same problem with me please solve that problem
Chaitanya Panse
Chaitanya Panse 2018-5-27
编辑：Chaitanya Panse 2018-5-27
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.

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采纳的回答

David Tarkowski
David Tarkowski 2011-4-20
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)
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Image Analyst
Image Analyst 2017-8-1
Try this:
>> ver
>> which getsnapshot
What does it say? You probably don't have the Image Acquisition Toolbox installed.
Ritika
Ritika 2018-2-3
How to save the snapshots during recording...can u Please help me for this

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更多回答（5 个）

Mark Jones
Mark Jones 2011-4-25
编辑：John Kelly 2013-11-13
Alternatively, it may be that your camera needs to warm up. To allow for this, try using manual triggering and GETSNAPSHOT.
Ian
Ian 2014-7-7
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?
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Ian
Ian 2014-7-10
Ahhh thank you very much! I have gotten the code to work now.
Antonio Meza
Antonio Meza 2015-11-5
Thank you!! it works. Finally, i can finish my project. Greetengs from Mexico

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finalyear project
finalyear project 2016-10-21
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?
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Syed Aameer
Syed Aameer 2017-2-1
attach this code above to to your code axes(handles.axes1);
hImage=image(zeros(80,120,3),'Parent',handles.axes1); preview(vid,hImage);

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mohamed hushan
mohamed hushan 2017-10-5
编辑：Walter Roberson 2020-5-16
vid = videoinput('winvideo', 1);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid); imshow(img)
after that how to save the snap images into folder?
Shrey Garg
Shrey Garg 2020-5-16
webcam not working in matlab
it opensup logitech webcam nut it doesnot works and displays message that application already opened

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