Hello World,

Well i am trying to develop a prototype using android phone to detect small movement and its direction like a mouse...the problem is that accelerometer aint reliable in slow steady motion (conduction tests on iPhone)...so i intend to use either the inbuilt magnetic compass or camera...now i am not sure abt the magnetic compass since i haven't received my phone yet(i am waiting)...so have started looking into some movement detection code using camera.

The problem is i am new to android dev...so it will be very helpful if i get help on how to use the phone camera(phone will arrive by this weekend) and incorporate it with my motion detection algorithm!!!

Thanks in advance!!!

Strider:
I have no direct answer for you, but from what I understand, what you want is quite complicated. Motion detection using a camera compares one image to the next. This requires real time image processing. I'm not sure how that would be done in java, or if at all. I do know it is possible in lower level languages such as C (Which is faster than java). If you wish to look into this I recommend looking into OpenCV.

Best of Luck

there are a few c++ and vb.net functions you can dl ... i know this isnt helpful but ... i also heard a rumor u can run c++ code in droid using JNI ? ... worth checking out might make life easier

and search for dorgem (open source motion capture & streaming util) (has motion detection forum)

and the way to visualise what you need to code

2 images to compare
16/32/64 sample pixels to check colour against picture being compared
and a tolerance value
compare each rgb value
see if it is in range with tolerance
if not the image has changed

Yes, you can write native C++ applications and invoke them from java.

You require NDK
http://developer.android.com/sdk/ndk/index.html

You can try http://code.google.com/p/android-motion-detection/

I wrote it and It's open source.