Hi, Set other camera parameter values to non-auto settings eg: set a specific white balance such as daylight, set flash to off etc.
Other than that ensure there is no other non essential app's / services running at the same time & examine your own app to minimise or eliminate any garbage collection, reduce sensor use / frequency. Try a few different devices, dual cores, quad cores particularly those claiming zero shutter lag. Some devices let you vary the camera preview frame rate & preview size maybe try this as well, not sure if that would make a difference as I've have not tried this myself. If that is still not good enough consider triggering a remote camera instead, such as an SLR via bluetooth or usb. Regards On Tuesday, July 31, 2012 6:41:53 AM UTC+10, greg wrote: > > Thanks Richard. Setting the focus to Camera.Parameters.FOCUS_MODE_INFINITY > helped as shown in the added histogram at > http://stackoverflow.com/questions/11727240/how-to-reduce-the-variability-in-android-camera-shutter-lag > > At the risk of sounding like an ingrate, do you have any ideas on how to > reduce the variability even more? (A range of 0.2 s still covers a large > portion of the periodic motion.) > > -- Greg > > On Monday, July 30, 2012 3:05:50 PM UTC-4, RichardC wrote: >> >> Could it be related to auto-focus? Try turning it off. >> >> On Monday, July 30, 2012 7:55:52 PM UTC+1, greg wrote: >>> >>> Given a known periodic motion (e.g., walking), I'd like to take a full >>> resolution snapshot at the same point in the motion (i.e., the same time >>> offset within different periods). However on the Nexus S (currently running >>> OS 4.1.1 but the same was true of previous OS versions), I'm seeing so much >>> variability in the shutter lag that I cannot accurately plan the timing of >>> the snapshot. Is there anything I can do in the application to reduce this >>> shutter lag variability? (In this application, the mean lag can be any >>> duration but the standard deviation must be small ... much smaller than the >>> 0.5 s standard deviation I am seeing.) I'm hoping someone has a clever >>> suggestion. If I don't get any suggestions, I'll post a feature request in >>> the Android bug tracker. >>> >>> I've posted the same question (and showing a histogram of camera shutter >>> lag times) at >>> >>> >>> http://stackoverflow.com/questions/11727240/how-to-reduce-the-variability-in-android-camera-shutter-lag >>> >>> Thanks! -- Greg >>> >> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
