May 17, Camera Image Stabilization: How It Works and Why It Is Important!

Why is camera image stabilization so important?

Well… few things
are more annoying to an audience than watching the constant motion and jitter
in a video that has been shot while the camera was bouncing, shaking or

Here’s more about it…!

blurring that occurs as a result of unwanted bouncing or shaking of the camera has
been a problem for camera operators… both amateur and professional… since the
beginning of photography, filmmaking and videography.

Unless you’re
shooting your video using some sort of stabilization device such as a tripod or
a SteadyCam… There is always potential for some sort of camera motion and as a
result… blurred pictures.

Unwanted Camera Motion…

Unwanted camera motionNothing Is More Frustrating to an Audience Than Unwanted Camera Motion In the Shot!

Camera motion such as:

  • The vibration you get when you are trying to shoot from
    a moving car…
  • The yaw and pitch of the waves if you’re shooting from
    a boat…
  • The medium-speed motion shake you get with just normal hand-shake or body sway when shooting with a handheld camera…
  • Or the motion (in the picture) you get when you’re using
    a zoom lens
    . Of course, with a zoom lens even a little shake or bounce becomes
Sage Tip – Camera Shake!

* A jittery image caused by a shaky camera is frustrating to an audience and makes for a video that may be unwatchable. 

All of these conditions above can cause less than optimal
results when you’re shooting footage. 
These days when almost all video cameras shoot in
HD (High Definition) it is more important than ever to eliminate unwanted camera motion.

Professional videographers will normally use a
camera image stabilization device , such as a tripod, but how about the rest of us who normally shoot holding
the camera without such a device handy?

Two Ways of Stabilizing the Image Within the Camera…

Two ways to stabilize your cameraThe Two Primary Ways Camera Makers Stabilize the Camera to Combat Unwanted Camera Motion

Camera image stabilization of course may not prevent all motion
blur caused by the movement of the subject or by extreme movements of the
camera but… 
It is designed to eliminate, or at least reduce, the blur that
results from normal, minute shaking due to hand-held shooting or other
environmental factors.

Video camera makers have tackled this problem of stabilization for hand-held cameras, video cameras and camcorders in a couple of ways.

There are two types of technologies that camera makers
have used for camera image stabilization:

Electronic camera stabilization

* Electronic (Digital) Image Stabilization (EIS)…

Electronically using the camera’s image sensor.

Optical (mechanical) image stabilization

* Optical Image Stabilization (OIS)…

Using a electro-mechanical control system built into the camera’s lens.

Each one has its strengths and weaknesses so let’s take
a look at each…

Electronic Stabilization…. Stabilizing the Picture Using Pixels and the Image Sensor…

Electronic image stabilizationElectronic Image Stabilization Is Picture Stabilization Using the Camera’s Image Sensor!

Using software within the digital camera or camcorder, this technique
corrects the electronic image from the image sensor (frame to frame) to counteract any unwanted motion.

It does this by using pixels outside the border of the
visible frame to provide a buffer for the motion. 
If the camera position is slightly shifted the frame inside
the camera is electronically shifted within this buffer area to the corrected
position and keep it centered. The more centered it is the less apparent  jitter
or shake you see.

The only drawback is that it uses pixels to form this
buffer zone that would otherwise be used in the frame. This means that you have fewer pixels to work with in
each frame and thus you lose a bit of picture quality.

This type of stabilization is usually automatic
in the camera and the camera operator has no need to worry if it’s on or off. This technology is also called digital image
by some camera manufacturers.

Optical Stabilization… Mechanical Stabilization by Shifting the Camera’s Lens Position…

Optical image stabilizationMechanical Image Stabilization Means That the Lens Itself Can Move to Combat Unwanted Motion!

An optical image stabilizer is an electromechanical mechanism
used in a camera or camcorder that stabilizes the recorded image by varying the
light path to the image sensor through the lens.

Most camera makers use a floating lens element that is always
moved to the optical center of the lens using gyroscope sensors and electromagnets. 
If the camera moves or shakes the light path through
the lens to the optical sensor is altered so that the image being shot stays centered
on the sensor.

This can also be done with the camera’s image sensor
also to provide even better correction of the image.

The key element of all optical stabilization systems is
that they stabilize the image projected on the image sensor before  the sensor
converts the image into digital information.
This makes for a much clearer and cleaner picture. 
In high-end camcorders and digital cameras you can turn the
optical image stabilization on and off and there are also usually several modes that
compensate for different types of movement.

Some videographers like to turn the camera image stabilization off however if they’re working from a tripod or if they have the camera on a SteadyCam.

What Type of Stabilization Should You Choose?

a Short Video from Panasonic… It Explains Some of the Different Ways
That Images Are Stabilized in a Digital Camera… Enjoy…!

[embedded content]

So… As you can see … Each type of camera image stabilization has its pros and cons!

A plus point for the Electronic stabilization is
it’s cheaper and does an adequate job of reducing minor camera shake, but this
technology does reduce the picture quality by reducing the number of pixels in
each frame.

If you’re not worried so much about outstanding picture
quality and just want to point-and-shoot… 
Then a digital camera with electronic stabilization technology should be fine.

Also… most video editing software programs have a
function that will let you do
some  correcting for camera shake. So… if you do have a little motion in the frame you can
compensate a bit for that during the video editing process. It (the video editing software) won’t do anything major as far as correction but it
will help a bit.

If you’re shooting in high definition and high
resolution images are important to you… then it would be better to invest in a
more expensive form of image stabilization. 
Optical stabilization will help you shoot sharper
images by giving you better stabilization of the camera. But, of course, it won’t come cheap! But if you are going to invest in a higher-end camera
anyway… then the optical image stabilization that comes with it will help you to
shoot better images.

When you’re shopping for a digital camera or camcorder just be sure to pay close attention to what type of stabilization technology the manufacturer is using. Is it optical stabilization or digital stabilization…? It makes a big difference…!

If you are shooting hand-held then there’s always the
possibility that you will get some images that are blurred because of camera
bounce and shake but…

These image stabilization systems do however give you a great chance
to shoot a nice sharp clear image…!

Have fun…!  Dan (Editor)

(Top of Page)

  1. Home

  2.  ›

  3. Video Camera

  4.  ›

  5. Image Stabilization

More on Camera Features…

Share if you enjoyed this post!

Source link

Leave a Reply