Java Help - JMF: controlling webcam color settings from java

Author

JMF: controlling webcam color settings from java

Roland Poellinger

2005-02-27, 8:59 pm

hello!

right now i am working on a webcam realtime image processor - that is motion
detection, color recognition, blob tracking etc.

i am working with JMF and a logitech usb cam (the one from the LEGO robotics
system). for the image analysis i would need a stable picture from the
webcam as to the white balance and the automatic gain. the problem: the
camera automatically adjusts itself to new light conditions etc., so that it
is not possible to compare two pictures because of the changing colors!

i happened to find a different program (commercial, windows executable),
that is able to control every single feature of the webcam including
automatic on/off, manual whitebalance, manual gain, etc. - i figured this
has to be possible in java, too.

anyone who knows about a similar project or how to use the JMF or even a JNI
(windows) to control the camera from java??

greetings and thanks in advance -
roland

bauscharln

2005-02-28, 4:01 pm

Roland Poellinger wrote:

> problem: the camera automatically adjusts itself to new light conditions
> etc., so that it is not possible to compare two pictures because of the
> changing colors!
> ...
> this has to be possible in java, too.

Hello Roland,
I'm also playing around with my webcam(also logitech), and image
processing. I just switched from C# to JMF.
In C# i had to use vfw. I didn't adjust the settings programmatically
but with the messages WM_CAP_DLG_VIDEODISPLAY or WM_CAP_DLG_VIDEOSOURCE
I could invoke a Settings-Window, set the parameters manually, and
deactivate the auto-adjust function...

However, I hope you find a more elegant way to achive this. If so, I
would be very interested in the solution.

cheers,
martin

Sponsored Links