[Etoys] [FUN]Track color with camera
bert at freudenbergs.de
Wed Feb 6 09:26:15 EST 2008
On Feb 6, 2008, at 15:03 , Karl wrote:
> Bert Freudenberg wrote:
>> On Feb 4, 2008, at 21:31 , karl wrote:
>>> I have used Wiebe Barons WebCamMorph and added some Etoy support
>>> to it. It is possible to track a color with the camera and a
>>> ellipse on the screen reflect the movement. I'll see if I can
>>> make it into a input feature like the eyeToy to the Playstation2.
>> Not bad :) Here's a project version of this:
>> Works nicely on the XO (if you have good lighting and a distinctly
>> colored shape) ...
>> - Bert -
> I tinkered a little more with this and added a setting for how many
> points should be scanned each scan. That fewer scanned points made
> morphic more responsive but jumpier movement of the ellipse. Next
> change will be to just return x and y values so any object can be
> hooked up to input.
> Future enhancement is:
> - several colors scanned for, that would enable more advanced
> input like one for mouse click simulation and one for movement.
> -putting scanning in a primitive would really speed up
> everything and make even more stuff possible, like gestures, sign
> language ? etc.
You might try (ab-)using BitBlt for this - for example, convert to 16
bit, then use a 32k entry tolerant color map to convert to b/w, then
use #innerPixelRectFor:orNot: or #rectangleEnclosingPixelsNotOfColor:
to find the rectangle enclosing the object ... Or with WarpBlt and
smoothing you can reduce the image size while retaining colors ...
- Bert -
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