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grab a frame without JNI Call

asked 2013-03-08 02:26:43 -0500

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Is there a way I can grab frames from android camera using openCV4android or JAVA Api without any JNI calls?

The reason is : I want a fixed fps for a particular application. I dont want to use the call back methods onCameraFrame (from CvCameraViewListener) or onPreviewFrame( using camera.onPreviewcallBack), which fails to give a fixed FPS.

I am desperate for help, after spending days :(

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answered 2013-03-08 18:26:04 -0500

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You're probably going to have a hard time doing this unless you want a frame rate that is quite low (like 5 fps, depending on your hardware). Go ahead and implement the callback interface but keep track of the timing and throw away any frames that you don't want.

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Low FPS is not a problem for me, but it must be fixed.

I cant used callback interface for it because they are not being called after an exact period od time. Its varying by a huge factor, which makes my intentions infeasible. with c++ I can use VideoCapture::grab() and retrieve() to grab image at a particular instant of time. that solves my issue. But can I do the same in JAVA somehow w/o JNI call?

sumitsh87 gravatar imagesumitsh87 ( 2013-03-11 05:38:55 -0500 )edit

What is the longest time-between-frames that you have seen?

xaffeine gravatar imagexaffeine ( 2013-03-14 13:10:32 -0500 )edit

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Asked: 2013-03-08 02:26:43 -0500

Seen: 242 times

Last updated: Mar 08 '13