Camera on SmartDashboard about team-100-wildhats

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Original comment by [email protected] on 13 Jan 2013 at 9:38

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Someone pointed out that AxisCamera is a singleton, so we can only instantiate 
one at a time in the robot:
http://www.chiefdelphi.com/forums/showthread.php?t=111524

If we're toggling or bypassing the robot, maybe that's not a problem. Just FYI.

Other camera issues:
* Remember we'll want crosshairs or a box overlaid on the image while shooting, 
but probably not while climbing.
* Talk to the mechanics people about where we might mount the 2nd camera in 
order to get a good view of the pyramid and climbing apparatus.

Original comment by [email protected] on 19 Jan 2013 at 7:56

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The camera extension uses WPICamera:
http://firstforge.wpi.edu/integration/viewcvs/viewcvs.cgi/trunk/WPIJavaCV/src/ed
u/wpi/first/wpijavacv/WPICamera.java?root=smart_dashboard&system=exsy1002&view=m
arkup

which extends WPIFFmpegVideo:
http://firstforge.wpi.edu/integration/viewcvs/viewcvs.cgi/trunk/WPIJavaCV/src/ed
u/wpi/first/wpijavacv/WPIFFmpegVideo.java?root=smart_dashboard&system=exsy1002&v
iew=markup

which extends WPIDisposable:
http://firstforge.wpi.edu/integration/viewcvs/viewcvs.cgi/trunk/WPIJavaCV/src/ed
u/wpi/first/wpijavacv/WPIDisposable.java?root=smart_dashboard&system=exsy1002&vi
ew=markup

and uses FFmpegFrameGrabber:
http://code.google.com/p/javacv/source/browse/src/main/java/com/googlecode/javac
v/FFmpegFrameGrabber.java

The camera looks like it's set up to send jpeg images in server-push mode. Even 
if we're not reading the images, it may still be trying to send them, until the 
socket backs up, since we're not actually closing the connection. Closing the 
connection appears to be the mechanism to tell the server to stop.  If we want 
this to happen, it looks like we should call cam.dispose(), set cam = null, and 
recreate the camera when we next need it.

Original comment by [email protected] on 21 Jan 2013 at 3:30

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The AXIS http protocol is described here:
http://home.arcor.de/basys/web/CAM/AxisCamera_HTTP_API.htm

We could request a video stream for a bounded amount of time:
"http://" + ip + "/axis-cgi/mjpg/video.cgi?duration=" + duration_seconds

We could also set framerate and other settings that way.

The URL currently being invoked relies on default camera settings:
"http://" + ip + "/mjpg/video.mjpg"

We'd just need to replace WPICamera with our own class that allows the URL to 
be specified.

Original comment by [email protected] on 21 Jan 2013 at 3:55

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The widget has been completed.

Original comment by [email protected] on 26 Jan 2013 at 9:20

• Changed state: Done