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based on the video, the phone's camera it's focusing on the closest object, in this case the black & white stripped surface. Keep in mind that if the object it's closer than 12cm, everything will be blurred out
Thanks for the reply.
The camera is blur even if it faced to a distant image.
Then I go to manual pic mode, turn the scene once or twice, it gets focused.
This situation is same every time I open the camera app.