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Archive for multitouch

Overlaying Camera Images

Due to the high price of video cameras that capture higher resolution images (1024×768), albeit usually slowly (at or around 25-30fps), I am investigating if it is possible to overlay two camera feeds into one. The concept is to point two similar cameras at the same target and program a calibration technique that will align/shift the images together from the video once they come in to the computer. If possible and if at a decent speed, it will allow for twice the framerate at similar high resolutions.

note:

  • stereo effect may occur if cameras are too far apart, this will have to be taken into consideration during any calibration process.
  • it may also be possible to try an alternative of instead using cheaper 800×600 svga or even vga cameras (640×480) that run at 60fps natively, and point them each at a piece of the target. alignment/calibration plus eventual stitching of the images together would be needed, as well as any issues of overlapping that may occur. this method would provide the possibility of extreme frames per second, enabling large-resolution machine scanning of the target areas at each individual camera image, which could potentially provide faster tracking times.

IR Flood Light

I finished soldering together a 36 LED array of 850nm IR LEDs at 50 degrees viewing. It is a kit found on BGMicro.

before.jpgsolder.JPGtrimming.JPGsodlering.jpgir-flood-back.JPGir-flood.JPG

As suggested by Dale Wheat, solder each piece at a time, and trim each row before the next. I would suggest starting from the middle row and working your way outwards, for added space; and make sure all connections are solid!

My goal is to use this in a diffused illumination multitouch device.

power-leads.JPGcharger-side.JPGcharger.JPGirflood-on.JPG

Notice the negative lead has printed dashes, it took me a little while to find out which was for negative/positive without using a voltmeter– I was afraid swapping the leads would fry something! Anyways, I do suggest a voltmeter.

The charger comes from an external maxtor hdd. Had I more time I would have tried to keep the end connector to preserve the use of the charger, but no matter I have a few laying around. The final pic is lighting up the sony cybershot dsc-w55 camera, which does not fully block IR light it seems.