What is OIS and How it Works?
In High end Smart phones you find a feature called OIS - Optical Image Stabilization, but what is OIS and How it works is the topic of today's Post.
Many of you must have observed that when you take a video, many times it is 'Shaky' and photos are 'very blurry'. To overcome "shakiness" and "blurriness" OIS and EIS (Electrical Image Stabilization) is used, with the help of OIS you can get the stable pictures and videos and as the name suggests it is "Optical" stabilization technique i.e. "Lens" of your smart phone which is kept in a floating state, it adjusts itself in a direction which is opposite to "Shake" of Person hand taking the photo.
How OIS Works
How you take a photo? You adjust the focus, aperture and shutter speed and when button is clicked then depending upon the speed of Shutter light is captured onto the Image sensor by passing through the aperture but if one's hand shakes then image captured will be blurry.
What OIS does is that depending upon the "shakiness" gyroscope sensor and Hall sensor (Motion and Direction) detect, can be fed for target position of lens and then "responsive" motion of lens is fed to springs via "servo filter" block which is responsible for movement of the lens in required direction (opposite to shake motion) for a quality image or video.
OIS is implemented in Hardware form i.e. "to compensate for shaking hand, optical lens moves in opposite direction. It could be 2 axis OIS, 3, 4 or 5 axis OIS, more the number of axis the more better will be result. So next time if you buy a phone do check that whether it is OIS image stabilized camera or EIS image Stabilized camera. EIS also serves the same purpose but EIS is Software solution of image stabilization while OIS is implemented in Hardware form. Some phones also come with both EIS and OIS stabilization (google pixel 2xl). OIS is better as compared to EIS but also costly as well. EIS uses processing power of phone while OIS uses electromagnets to solve the same problem.
About Me
My name is Fahad and I am an Electronics Engineer. I am currently working at a Power Plant in Pakistan as Junior Engineer in Instrumentation and Control Division (I&C). My duties include Maintenance and Debugging of Distributed Control System (DCS) and Programmable Logic Controllers (PLC) of whole Plant.
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