Image Stabilization

Image Stabilization Techniques

In spite of all the amazing cameras or drones with cameras that we have, we still have our complain of pictures  not entirely being stable. We still get blurry images and look for ways to avoid blurred videos or pictures. We need stable images specially when we are making videos or creating any sort of animations. There are two most popular techniques to achieve this image stabilization in videos. Stabilizing image is highly essential for professional videos that we have, or for animations created for professional reasons. The two most popular techniques for image stabilisation includes EIS ( Electronic Image Stabilisation) and OIS (Optical Image Stabilisation). The two techniques differ in certain way and both the ways of achieving image stabilization has its own perks. And the cameras that we use have either OIS or EIS, hence they can guarantee stable images and videos to us. These IS can be turned on or off depending on our type of footage.


Image Stabilization Comparison

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Let's look into the two techniques to stabilise images in further details.

 Electronic Image Stabilization Technique vs Optical Image Stabilzation Technique

We should first be able to understand how the two different techniques aim to achieve stabilization in images. So as we shoot in our cameras, they are not instantly stabilized. In order to make the pictures stable they have to pass through certain softwares which is usually in buil in the camera and then come out as fine stable pictures.

For EIS, the footage directly goes to the software after being shot and then gets influenced through the chip to become stable. The software works in a manner where the little chip moves in the opposite direction in which the image moves, so that it can cancel out the effect of image shaking. So sometimes we have shaky hands while taking a snap, infact most of the times our snaps are shaky. How do you think that  gets tackled? Some of the cameras use this EIS and this EIS has two varying methods to achieve their objective. Let's look into the two different pathways of obtaining stable images.

The chip is known as the CCD where the image gets manipulated. One of the method is to zoom the image that reaches CCD, it is zoomed enough so that any blurry effect on the image can be detected and EIS can then cancel out on the blurr effect. This is beneficial, however as we know sometimes zooming in the pictures can cause the quality of the original picture to deteriorate. Now we have to measure out if our trade off is worth or not!

The second way used by the EIS system in order to stabilize our image is to use an oversized chip that has the software, i.e an oversized CCD. The image is usually smaller than our CCD when this method is being used. If the image has zero blur effect in it then it lies on the centre of the chip. However, when there is a blur detected in the image, the chip moves exactly the proportion in which the image has been shaky and cancels out the blur effect.

In order to facilitate the function of an EIS, the cameras usually put their in-built accelerometer and gyroscope to good use.

For the OIS, they have an entirely different approach to stabilize the image or footage taken through the camera. As we already know that EIS sends the image to the CCD immediately and after reaching the CCD, the image stabilizes. However for OIS, the image gets stabilized before it gets to reach the CCD chip. By the time the images reaches the chip,it fits onto CCD perfectly. You must be wondering how exactly does that happen. Pretty straightforward, EIS takes he help of a software whereas the OIS uses its own hardware to stabilize the image. They usually have a prism shaped glass set up in their hardware system, so before reaching the chip, the image passes through the hardware system. While it passes the prism, it detects any kind of shaky effect on the image or video. After detection, the image moves the prism in a manner that the frequency by  which the image shook is matched by the prism rotating frequency, in order to cancel out the effect of the blur. Two different glasses move in two different directions which is opposite to the direction of the shake. And the cameras operating such OIS systems have a built-in gyro-sensors. This method somehow does not tend to deteriorate the quality of the image under any questions.


OIS – Optical Image Stabilization – Gary explains! - Android Authority


Now the dilemma is, which IS does its job best and which one should we opt in for. Both OIS and EIS has its own set of pros and cons.

EIS systems are usually faster than the OIS system. This is because for the OIS system we need the hardware itself to move and make the changes in the image, whereas for EIS it all happens via the software in an extremely high speed.However,as the image gets zoomed in or minimized out, the quality of the image deteriorates severely and in comparison to that the OIS has no significant con to be pointed out.

The question that remains is why use EIS anymore, since it has greater drawbacks than the OIS does. But it all depends on, firstly preferences and secondly on the kind of video that we intend to shoot. In case you're looking for excellent image quality, choosing a camera with EIS system is the worst idea possible.On the other hand, if you intend to shoot really fast,then EIS could be a good choice for you. And if you want a camera that is not very filled with hardware, do not plan to opt in for the OIS system.

So the choice of OIS or EIS depends entirely on preferences and so does the choice of action cameras. Looking into different types of action cameras, and how our cameras make things easy for us, let's now have a look at how these action cameras are entering the mainstream industries and becoming a necessity in everyone's life.

We would assume that all those camera descriptions given above are mostly used to capture memories, hut in the status quo the idea falls apart. Action cameras are widely used by people in order to make money. Let's have a look into how different people make money out of something that was created for passion.