[android-developers] Re: Filtering Android Sensors Noise
First of all, thanks everybody for their answers. I've been in journey, that's the reason because of I haven't answered before. I've tried average and tresholding, althougt not too much extensively. Special thanks, Yahel, the parralax is very important. I've seen that is present in the digital filter implemented in the class OrientationEventListener. About averaging historical values, I just want to mean I was averaging the n last values catched by the sensor. Where n is an integer greater than 0. By the way Frank Weiss, if you had got success, would you been so kind as to share the magic algorythm? Thanks everybody again -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: Filtering Android Sensors Noise
I posted my code in this thread: http://groups.google.com/group/android-developers/browse_thread/thread/d61f7790afb3f8b6/770777368e823548?lnk=raot That code is for a band pass filter. Refer to the linked article which gives the formulas for low pass filter as well. http://www.dspguide.com/ch19.htm Please read at least the first two sections. The end of the second section has the formulas for a low pass filter. On Wed, May 26, 2010 at 6:06 PM, Alfonso alfonsocris...@gmail.com wrote: First of all, thanks everybody for their answers. I've been in journey, that's the reason because of I haven't answered before. I've tried average and tresholding, althougt not too much extensively. Special thanks, Yahel, the parralax is very important. I've seen that is present in the digital filter implemented in the class OrientationEventListener. About averaging historical values, I just want to mean I was averaging the n last values catched by the sensor. Where n is an integer greater than 0. By the way Frank Weiss, if you had got success, would you been so kind as to share the magic algorythm? Thanks everybody again -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.comandroid-developers%2bunsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Filtering Android Sensors Noise
In addition to averaging. You can also investigate tresholding. Display your icons and don't move them unless there is a minimum amount of displacement. You'll need fine tuning here, it will compensate for small movement of the hand while looking through the phone. Don't forget parralax in your work : Averaging and thresholding values should be proportionate to the z value of the point of interest your icon is showing. Yahel On 21 mai, 19:30, Alfonso alfonsocris...@gmail.com wrote: HI, I'm programming an Augmented Reality application. It's development it's in an advanced state but I can't place the icons on the screen so still as anothers programs does (Layar, in example). This is because of the continuous variations of the sensors. I've tried the three modes of the sensors (FAST, GAME, and NORMAL) but I only get them to move more or less fast. The shivering is the same at different speed. Finally I thougth I could reach my goal with a digital filter, averaging historical values. But again the icons continues moving, specially the most far placed ones (in the z axis). Please, could some one help me with some clue? Of course, any help will be appreciated. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group athttp://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Filtering Android Sensors Noise
On 22 mai, 02:38, BobG bobgard...@aol.com wrote: Averaging is the right algorithm. The tradeoff is averaging lots of readings makes the movement smoother but slower to respond (lag). try averaging 8,16,32,64 samples. When it gets too slow, back up one. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Filtering Android Sensors Noise
Oh and I forgot, The other option you have that would be very accurate but requires a biggest computational and battery overhead : Form recognition. Using specific points on the image and following them will give you a much better tracking(after effects style) on small movements. Completely removing the bouncing around of your icons. Good luck. Yahel. On 21 mai, 19:30, Alfonso alfonsocris...@gmail.com wrote: HI, I'm programming an Augmented Reality application. It's development it's in an advanced state but I can't place the icons on the screen so still as anothers programs does (Layar, in example). This is because of the continuous variations of the sensors. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Filtering Android Sensors Noise
Averaging is the right algorithm. The tradeoff is averaging lots of readings makes the movement smoother but slower to respond (lag). try averaging 8,16,32,64 samples. When it gets too slow, back up one. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
