Opencv camera and autofocus

[AlexG]

Hello guys,

I have a question regarding autofocus. Same code (with continuous autofocus set in camera parameters) works well on some devices (Sony Ericsson Xperia Mini pro) but on my device (Samsung Galaxy S2, Android 4.0.4) it refuses to autofocus. Why is that?

I got it to autofocus on the Samsung only by using the Android Camera (but the fps is very low when converting to RGB for some reason).

Is autofocus not supported in Opencv native camera?

Thank you.

[Andrey Pavlenko]

On devices that support FOCUS_MODE_CONTINUOUS_VIDEO - it is set. 

[AlexG]

Here is what logcat is saying:

05-10 23:36:57.530: D/OpenCV_NativeCamera(3905): initCameraConnect: autofocus is set to mode "continuous-video"

05-10 23:36:57.530: D/CameraWrapper(1871): camera_fixup_setparams: set parameters fixed up

05-10 23:36:57.530: D/SecCameraHardware(1871): int android::HAL_camera_device_set_parameters(camera_device*, const char*)

05-10 23:36:57.530: D/ISecCameraHardware(1871): setParameters X: success

As I understand, the way I set continuous autofocus is ok. Nevertheless it will not work.

Edit: And I also checked before setting this autofocus mode, it is listed as supported by Camera.

[Alexander Smorkalov]

I check this problem on the same device with Android 4.0.3. It works fine.
OpenCV native camera sets parameters using the same interface as Java camera. Google says about Java camera:

This is the best choice for video recording because the focus changes smoothly. Applications still can call takePicture(Camera.ShutterCallback, Camera.PictureCallback, Camera.PictureCallback) in this mode but the subject may not be in focus.

Source: link

Smooth focus changes can be the root of the problem.