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Why EIS is actually better than OIS for videos «Smartphones :: Gadget-Hacks



If cameras are priority, image stabilization is one of the first specifications to be tested on a new phone. You've probably been told that Optical Image Stabilization (OIS) has top priority. However, this is not the case if you record a lot of videos. Instead, we would argue that electronic image stabilization (EIS) actually works better for video.

While OIS is superior to still images, video may not. Although videographers will benefit from OIS, EIS actually does better with moving images in a row. Both stabilization methods help to minimize camera shake, but EIS is a better choice for video because of its way of working.

How OIS works

In cell phones, OIS sets the lens over the camera camera module with springs and electromagnets. The phone detects the frequency and amplitude of each blur and then uses the solenoids to adjust and adjust the angle of the lens. The lens moves in the opposite direction of the camera shake, allowing the image on the image sensor to re-center.

All this happens before the image hits the image sensor, which means no image degradation occurs. OIS uses your phone's gyroscopic sensors to help detect camera shake. The gyro sensors measure movements and send that data to a "micro-center", which then moves the lens to compensate for the movement.

OIS in use in the Samsung Galaxy S7 Edge. Image by Inam Ghafoor / YouTube

In short, OIS moves the image sensor mechanically in response to a jitter in your phone. However, this physical exercise takes time, which is a valuable asset in high frame rate videography. Another disadvantage of OIS in terms of video is that the movement of the lens with respect to the image sensor can lead to a distorted perspective, which appears in videos as a "Jello effect".

How EIS works

] Electronic image stabilization differs. The system still detects camera shake with its sensors, but adjustments are made when the image hits the image sensor.

This is achieved by zooming the image until it is larger than the image sensor, and then searching the image for motions, then counteracting by moving the image in the opposite direction. However, this method reduces the video quality and resolution due to zooming.

EIS works much like the Scaling and Perspective tools to re-center an image in Photoshop. Image of Dallas Thomas / Gadget Hacks

Another method is to use an oversized image sensor where the image occupies only about 90% of the chip area. The additional 10% of the space is then used to re-center the image without "cropping".

What makes EIS better?

Since the lens does not move with EIS, the process of capturing each frame in your video is never slowed down by mechanical parts. EIS just has to adjust the image, resulting in a much smoother video.

In addition, EIS systems can predict the shift of the next frame, causing a big difference in video quality. While moving, the camera determines the direction in which you are moving, and if it determines that you are moving in one direction (for example, if you pan the camera over an object), it can adjust the next layer accordingly , This allows a much smoother video.

Picture of Jon Knight / Gadget Hacks

According to Google, the pixel team between OIS and EIS had to opt for the Internet The first pixel they have is their video performance agreed on EIS. According to Google's Camera Product Manager, Isaac Reynolds:

"EIS and OIS have very different goals, so you can not compare them to what's better / worse." OIS improves photography in low light by shaking it Physically Compensating Each Image and ICE Improves Blurred Video Images by Maintaining a Consistent Image Between Multiple Video Images OIS is mainly for photos and EIS is for video only. "

– Isaac Reynolds

While Google has added OIS in the pixel 2, it was possible to achieve fantastic stabilization with only EIS on the original pixel, also thanks to their algorithms. This adds another benefit of EIS that can be improved with software updates over time. Because algorithms determine how the system compensates for certain movements, OEMs can improve their function by collecting more data.

This article was created and edited during the special coverage of gadget hacks via smartphone-based video creator tips for filming. Take a look at the entire Videography series.

Compare smartphones with EIS & OIS

Cover photo of Jon Knight / Gadget Hacks

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