Squeak controlling a digital camera
ohshima at is.titech.ac.jp
ohshima at is.titech.ac.jp
Fri May 21 14:33:36 UTC 1999
Hi,
I wrote several primitives for ICRUISE PDA to manipulate a
digital camera which comes with it. Now, Squeak has a
capability to control an 850k pixel digital camera!
Attached is a picture I took by the camera. You'll find
nested recursive rectangles in the picture. In fact, the
picture is the screen of Squeak which is going to take
itself on a mirror:-) (The picture is out of focus because
the auto focus function doesn't seem work for the image on a
mirror.)
The following is the expression I evaluated to take the picture:
--------------------
f _ Form extent: 320 at 240 depth: 16.
"a form where the result will be stored"
camera _ DigitalCamera startCameraOn: 1 size: 320 at 240 zoom: 1.0 depth: 16.
"create a camera object"
camera takePictureInto: f buffering: true buffer: (200 at 200 extent: 320 at 240).
"this primitive call doesn't return until the shutter button is pressed"
camera release.
"release the hardware resource"
--------------------
It is also possible to get the image on the CCD one after
another. So I can make a short slow-motion movie by
evaluating the following:
--------------------
fs _ (1 to: 20) collect: [:i | Form extent: 160 at 120 depth: 16].
camera _ DigitalCamera startCameraOn: 1 size: 160 at 120 zoom: 1.0 depth: 16.
1 to: 20 do: [:i | camera PeekOn: (fs at: i)].
camera release.
1 to: 20 do: [:i | (fs at: i) display. (Delay forMilliseconds: 100) wait].
--------------------
It's fun!
Apart from the camera stuff, with a hardware that has
120MHz SH-3, 8MB DRAM, and 640*480*16 LCD, I found I feel it
practical to use Squeak on ICRUISE.
OHSHIMA Yoshiki
Dept. of Mathematical and Computing Sciences
Tokyo Institute of Technology
P.S.
I couldn't figure out how to save a 16 bit depth Form in
convenient way. Would anyone teach me?
P.P.S.
An email I sent a few days ago seems lost. I'm sorry if
you get another copy of this email.
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