Saturday, March 21, 2009

the calm before the storm

finished finals yesterday. despite my thorough understanding of feedback control systems, i'm now worried that i won't pass the class because of my homework grade. i didn't turn in the last two assignments because i got sick and chose to sleep instead of getting them done. when i looked at my "current grade" at the end of the final, i was at 38.1% (out of a possible 50%), and i know i missed a couple of things on the final. if the grade scale is straight, then i need at least a 70% on the final to have a comfortable c grade. hopefully i didn't screw it up too hard.

this is the calm before the storm. i've spent all day in la, received an award for our ieee student branch, and had a nice little meetup with other monome users in the la area.

in browsing around for parts to order, i've just now realized that my task of webcamera stitching is going to be substantially more difficult than i had previously expected.

not only am i going to have to recompose the image (what i naively perceived to be the extent of the problem), but i'm going to have to devise a method of calibrating the cameras so that the image recomposition doesn't contain any redundancies from overlapping computer vision.

my intuition is telling me that a set of blocks with protruding silicone fiducials is going to be the best approach for calibration...

if there's guaranteed overlap and only 4 webcams, then i think only 5 markers are needed to fully calibrate. if i'm wrong, then up to 9 markers might be needed for 4 cameras. for 6 webcams, up to 12 may be needed.

at the end of the day, the projectors can display an image instructing the person performing the calibration where to place these markers, but that's assuming that the projectors are independently calibrated..

i'll close this with a few of my curiosities:
- will the table be rigid enough so that the cameras can be calibrated once and left in place?
- does it make more sense to figure out a calibration method before installing the IR bandpass filters?
- does the filter take advantage of polarization? would it be possible to make a filter out of two polarized lenses? if it is, that implies we can make a variable bandwidth filter, can we calibrate in the visible spectrum and then implement the IR-pass by twisting the lens?

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