What is Optical Image Stabilization (OIS )

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Image Stabilization (or IS) is a method to reduce  taking blurry photos by moving the camera lens automatically to compensate for camera movement which can be induced by the user hand-holding the camera, or because the camera is fixed on a platform prone to vibration or movements.
Optical Image Stabilization (OIS) is a feature that you find on the cameras of many high-end smartphones.
OIS eliminates a very common problem: blurry photos induced by user movements (shaking, screen tap), or motion of the camera in general (maybe you’re mounting the camera on a bike/helmet).

How does OIS work 




You can think in terms of a traditional camera, the process of taking a photo is like this- you set up your shot, you adjust the focus, aperture, and shutter speed and then you click the button to open the shutter and allow the light in, so it can be captured on film or an image sensor. But here is the thing, if you move the camera, even a little, during the moment when you open the shutter and let the light in then the resulting picture will be blurred. In most of the cases, a blurred picture is a bad picture. So, OIS is a technology  that reduces the blurring caused by the motion of a camera during exposure.
If the shutter speed is high, it means opens and closes very quickly, then the amount of time when the camera needs to be steady is reduced. However if the shutter speed is low, for example in poor lighting conditions, then the amount of time the shutter stays open is longer and the amount of blurring due to movement/shake increases.
 OIS work is compensate for small movements of the camera during exposure. In general terms this is achieved by the use of a floating lens, gyroscopes and small motors. The elements are controlled by a microcontroller which moves the lens very slightly to counteract the shaking of the camera or phone, i.e. if the phones of is being moved to the right, then the lens is moved left. 

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