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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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