Author Topic: Johnny Lee's Automatic Projector Calibration - where do I get this from?  (Read 7882 times)

Offline OM2

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Can someone tell me where I can get Johnny Lee's Automatic Projector Calibration from?

1. I need to make what he does for the hardware - are there any detailed instructions for this?

2. I assume he's using some software to the do the magic?

I can't come across ny downloads for software or anything else apart from the demo video?

Thanks


OM



Offline dice

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From what I have seen it uses a custom hardware and software, which I have not seen any specs for.

So I dont know if Johnny will release that or not, you can try to email him and see.

Dice :)



Offline UndCon

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I havent seen the code either  - I would love to have a go at it:)



Offline OM2

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thanks for the replies
just emailed him
i'm sure he'd too much of a celebrity thathe won't reply to the billions of emails he no doubt gets!
if he replies... i'll let you guys know

but the other thing: i can't quite figure out how it can be possible at all what he's done!!
he uses a standard projector????

ok... so johnny's got his special thing
question: would it be possible through tweaking a projector to project precisely onto obscure angles?
(i ask not being an expert with projectors)
let me know
thanks



Offline wizgrav

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he's connected optic fibers in a controller. The analogies between these points are considered known. He projects graycoded images of progressively smaller steps on that surface. He collects the 4 bits(if light was visible at each point) for each projected image and from the compiled data he locates these points relative to the original projection area. In each step he substracts the areas of no interest, I think and adjusts the next slide accordingly. You'd need some fibers, photo diodes and a microcontroller to communicate/sync with the graycode slideshow. It's simple and brilliant, well done. BTW hello everyone
« Last Edit: December 01, 2008, 03:11:56 AM by wizgrav »



Offline UndCon

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A great explanation by wizgrav!

You can pulse(code) the LED's by using a 555timer and get orientation known to application

I can think of a few good games to code with this application...



Offline wizgrav

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I wonder if the calibration could be performed using just 2 fibers on opposite corners(It can't, I wasn't thinking in terms of perspective, you need at least 3 I guess). A working product could be marketed as a collection of bluetoothed fiber/diodes attachable to any screen's corners. Lee any thoughts on that?
« Last Edit: December 01, 2008, 05:18:56 AM by wizgrav »



Offline OM2

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i emailed johhny asking about the whole thing
he replied syaing that the hardware wasn't avaliable...
but: "you can construct a simple set of light sensors yourself using something like an Arduino microcontroller"

i googled arduino microcontroller... and came across www.arduino.cc
wow... that all looks amazingly interesting!!
wish there were more hours in the day!!

let me know what you guys think

i'll be looking into it myself...
but i think some of you maybe a few light years ahead of me and more clued up on how to make a wfirst orking prototpye - please post back if you have any luck!

i have replied saying: let's assume we can make the hardware... what next...?  how about the software?

www.arduino.cc: it seems as though you can do sooo many things
i'm sure you can code johnny's application with the commands available

question: would it be possible through tweaking a projector to project precisely onto obscure angles? (i ask not being an expert with projectors)
(i asked the same question in one of the other replies but didn't get answer! :( )



Offline dice

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Quote
question: would it be possible through tweaking a projector to project precisely onto obscure angles? (i ask not being an expert with projectors)

Well really I would think it would be easier to use the computer to figure out what size and shape everything should be not the projector.  In Johnny Lee's Video the computer is generating what needs to be projected and what shape it should be.

As for how to do it... no clue

Dice :)



Offline OM2

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Quote
question: would it be possible through tweaking a projector to project precisely onto obscure angles? (i ask not being an expert with projectors)

Well really I would think it would be easier to use the computer to figure out what size and shape everything should be not the projector.  In Johnny Lee's Video the computer is generating what needs to be projected and what shape it should be.
aaah... i never thought of that!
i was scratching my head trying to think how the lamp output could be physically changed
but what you suggest makes more sense
i'll let you all know if johnny replies



Offline UndCon

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In some of the videos you can see the fiberoptics(rear side) in the corners.

they tell the program the position of the "board" and rotate the displayed image accordingly