Image stabilization

Image stabilization, often called IS, is a set of methods used to reduce blurring that happens when a camera or other device moves during the time it is taking a picture. This blurring can make photos look shaky or unclear.

It mainly helps with movements like tilting or turning the camera, which can be thought of as yaw and pitch. Image stabilization is used in many devices, such as high-end image-stabilized binoculars, still and video cameras, telescopes used for looking at the stars, and even smartphones.

When taking photos with still cameras, camera shake can be a big problem, especially when using slow shutter speeds or long lenses like telephoto or zoom lenses. For video cameras, camera shake can make the video look jittery from one frame to the next. In astronomy, cameras also have to deal with changes in the atmosphere that make objects appear to move.

Application in still photography

In photography, image stabilization helps you take pictures with slower shutter speeds, from 2 to 5.5 times slower than usual. This means you can use speeds like 1⁄15 or 1⁄8 of a second and still get clear pictures, instead of the faster 1⁄125 of a second you might normally need.

A useful rule is to use a shutter speed that is the opposite, or reciprocal, of the lens’s focal length. For example, a 125 mm lens works best at 1⁄125 of a second. With image stabilization, you can go much slower and still keep the image sharp. It’s important to remember that image stabilization only helps with small shakes from holding the camera by hand. It won’t stop blur if the subject is moving or if you move the camera a lot.

For taking pictures of the stars, image stabilization can help a little, but usually, you need to keep the camera very still because the Earth moves. Some cameras can use special tools to help with this. Stabilization can be placed in the lens, the camera body, or both, each with its own good points and challenges.

Techniques

Optical image stabilization

An optical image stabilizer is a tool in cameras that makes photos and videos clearer by moving parts inside the lens. This helps stop blurry pictures when someone is shaking while taking photos or videos.

Benefits of OIS

Optical image stabilization helps people take photos and videos with less blur, even when holding the camera by hand. It works well in different lighting conditions and makes videos look smoother when watched on big screens.

Names by vendors

Different companies use different names for this technology. Some of these names include:

• Vibration Reduction – Nikon
• Anti-Shake – Minolta and Konica Minolta
• IBIS – Olympus and Fujifilm
• Optical SteadyShot – Sony
• Optical Image Stabilization – Fujifilm
• SteadyShot – Sony

Most high-end smartphones use this technology for better photos and videos.

Lens-based

In some cameras, this technology works by moving parts inside the lens. Sensors detect shaking, and the lens adjusts to keep the picture steady. Some lenses have extra modes to help with specific types of movement.

Sensor-shift

Another way to stabilize pictures is by moving the camera’s sensor instead of the lens. This can work with lenses that don’t have built-in stabilization. It also helps correct certain types of movement that lens-based systems can’t.

Dual

Some cameras use both lens-based and sensor-based stabilization together. This combination can help make photos and videos even clearer.

Digital image stabilization

Digital image stabilization is another way to make photos and videos clearer. It uses software to pick the best moments from several quick photos or videos. For videos, it adjusts each frame to smooth out movement.

This type of stabilization can’t fix blur caused by moving objects during the exposure time of a photo. The best way to avoid that is to use a faster shutter speed or more light.

Stabilization filters

Some video editing tools have filters that can stabilize shaky videos. These tools track movement in the video and adjust each frame to make it smoother.

Orthogonal transfer CCD

In astronomy, a special tool called an orthogonal transfer CCD can shift the image while it’s being captured. This helps keep pictures clear even when there’s movement.

Stabilizing the camera body

One way to keep a camera steady is by using a gyroscope attached to the camera. This is often used when taking photos from moving vehicles.

Another way is to use a special camera holder, like a Steadicam, which keeps the camera stable while it’s being moved.

Camera stabilizer

A camera stabilizer is any tool that keeps the camera steady. This can be a Steadicam, a tripod, or even just a steady hand.

In biological eyes

Main article: Vestibulo-ocular reflex

In many animals, including humans, the inner ear works like a special tool in cameras to keep images steady. It helps move the eyes to keep things clear when the head turns. When the head moves, the inner ear sends signals to the eye muscles to make the eyes move in the opposite direction. This helps us see clearly, even when our heads move quickly.