Thanks, everyone for being here, I gonna express some special function which you have seen in most of the phones now…” of about What is OIS? Why we need it for recording a better experience?
Nowadays we are competing for a better click and getting more and more features on the camera. As if you wanted to capture a blurred or focused image then you have to buy DSLR. Optical Image Stabilization (OIS) which promises less blurry images and smoother video.
When you are going to capture a photo, you might have seen your hand is moving. Even a little during the moment, when you open the shutter and let the light in, As a result, your picture may be blurred. We had a way to lock our joints like you can with a tripod head, there wouldn’t be a problem.
To solve out, we need some kind of stabilizing device to help us out. Device to help it can remove the large movement not too much but you will be satisfied. As it can reduce little imperfections made by your body. Today, I will figure out all — What is OIS (Optical Image Stabilization)? | Why It is Need in Smartphones/Camera? | Why OIS is Better than EIS?
What is OIS (Optical Image Stabilization)?
The Technology OIS or optical image stabilization is a technology that helps counter-balance the slight physical movements. Different companies use different names for their OIS Technology. For instance, PureView by Nokia, Ultrapixel by HTC, etc. Nokia made the first cell phone optical stabilized sensor built into Nokia Lumia 920.
OIS is more popular in consumer camera devices because it works efficiently even in poor lighting conditions and you won’t see degradation in image resolution as corrections are made before the signal conversion in digital format.
We all know “how a camera works and how it takes pictures”? Every Camera has the same working principle that Light enters into the camera through an opening called Aperture which then passes through the lens and falls on a sensor that forms the image.
Now, generally, this process happens very fast. But when there is insufficient light, then your camera takes a little more time than usual to take a picture. And the longer it takes for the camera to take a picture, the higher will be chances of the picture getting blurred, especially when you do not have a tripod in most cases, a blurred picture is an ugly picture.
So, OIS is a technology that reduces the blurring caused by the motion of a camera during exposure. Obviously, if the shutter speed of your smartphone camera is high, means it opens and closes very quickly, then the camera needs a little bit of time to click it, result to reduce the blurry image and when the shutter speed is low, the amount of time the shutter stays open is longer and the amount of blurring due to shaking, increases that’s why It is Need in Smartphones/Camera?
How OIS (Optical Image Stabilization) Works?
Mainly, OIS reimburse your image even of small movement/shake of your hand that gives you an unblurred image. While taking a photo and your hands move a little at the same moment, then OIS counteracts by shifting the lens element to correct for these shakes but OIS can’t do anything if the blur is caused by your subject moving too fast for your exposure to freezing the action; it only works to counter camera shake.
Likewise, If you have used software like After Effects or Premiere Pro to stabilize your footage, you will know they will move the image around by tracking certain points in the image and following them from frame to frame, trying to reduce or remove the movement of those points. This also results in a loss of area (quality/pixels) of the image, EIS worked similarly.
While capturing a shot or a video, the phone’s camera software keeps a reference frame in memory for comparison with the successive shots following the first one. The software then attempts to do what AE or Premiere pro does – moving those reference points around to bring them closer to the same point in the frame.
However, some phones now use a gyro-based tracking to compensate for camera shake. This would still work by moving the image around on the sensor, but using a physical giro to gather the tracking information.
In other words, there’s no clear cut answer, and each phone works differently. Added to that, the phone manufacturers aren’t giving too much information away about how their system works exactly.
Why OIS is Better than EIS?
The main advantage of OIS is that there is no image degradation as necessary compensations are made before an optical signal is fed to the CCD. But the hardware for the mechanical motion of lenses buts a strain on your battery backup and also adds to the weight of the device.
EIS has become quite popular these days because they are light and less expensive. And with improvement in algorithms used for stabilization image degradation is minimal as well. But at low resolutions and in poor lighting conditions, you might see significant degradation.
With consumer electronic devices which don’t have a very high resolution, like your Smartphone’s or low-resolution Camcorders, OIS is a more effective technique and also outperforms EIS in dimly lit areas.
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