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kibsoft / QtMEL

Qt Media Encoding Library
GNU Lesser General Public License v2.1
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Ability to change camera's parameters #6

Open kibsoft opened 11 years ago

kibsoft commented 11 years ago

Add ability to change contrast, saturation, hue, brightness in the CameraGrabber class.

ego-software commented 11 years ago

How could I change camera's capture resolution in CameraGrabber class?

kibsoft commented 11 years ago

There is the static maximumFrameSize function that returns max camera resolution. If you want to grab images with higher/lower resolution you will need to use setSize function. Images' aspect ratio will be saved.

ego-software commented 11 years ago

Thank you very much! However, maximunFrameSize always returns 640x480 no matter what webcam I am using even if they allow higher resolution. Is this the maximum achivable resolution? If I set the resolution using setSize function the image is just upscaled. Is there any parameter I should change to try to achieve a higher resolution? Many thanks in advance :)

kibsoft commented 11 years ago

Seems that it is OpenCV's issue. I thought that CV_CAP_PROP_FRAME_WIDTH contains the max size by default but I was wrong.I think there is no other way to know max camera resolution :( You can set CV_CAP_PROP_FRAME_WIDTH and CV_CAP_PROP_FRAME_HEIGHT manually. But there is an issue. You have to either extend QtMEL and rebuild or use OpenCV directly in your code. If you use Qt5 version then I can do that myself and will give you binaries (but I need some time).

ego-software commented 11 years ago

Thank you very much for your reply! I am using Qt5 and would be great if you could upload the binaries :) But I will try myself your suggestions meanwhile.