Re: how turn off camera after using CurrentImage?
- To: mathgroup at smc.vnet.net
- Subject: [mg123984] Re: how turn off camera after using CurrentImage?
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Wed, 4 Jan 2012 05:00:43 -0500 (EST)
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- Reply-to: murray at math.umass.edu
OK, ImageCapture[] works just fine. Thanks! So does the undocumented IMAQ`StopCamera[]. But surely such a utility should be available as an ordinary function -- and documented. I find no Camera* functions documented, and evaluating CameraOff[] just returns the input expression. On 1/3/12 8:37 AM, Szabolcs wrote: > On Tuesday, 3 January 2012 11:27:08 UTC+1, Murray Eisenberg wrote: >> On an iMac under OS X 10.6.8 (Snow Leopard), in Mathematica 8.0.4, I >> evaluated CurrentImage[]. That automatically turned on the built-in >> "FaceTime HD" camera. >> >> Is there some programmatic way from within Mathematica to turn the >> camera off? >> >> And if not -- OT: is there some simple way to do this in OS X? (Other >> than open and then quit the FaceTime app.) >> > > Try ImageCapture[]. It has a control panel with an off button. > > I think CurrentImage[] keeps the camera on because the camera needs time to adjust after it has been turned on. The very first image captured is sometimes very dark or black, but in a couple of seconds anfter that I'm getting good images. Also, initialization takes time, so if you capture in a loop, all the turning off/on would be too slow. > > I'm also wondering through if there are CameraOn[] and CameraOff[] functions. > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305