Optical dan Digital Image Stabilization

Photography, image stabilization usually allows use of shutter speeds slower than 4.2 points (exposures 4-16 times), although the effective rate reported even slower.

General rules for determining the slowest possible shutter speed for hand without any visible confusion due to the vibration of the digital camera does the same as the equivalent of a 35mm lens focal length. For example, the focal length of 125 mm on a 35mm camera, vibration or movement of the camera affects the sharpness, if the speed is slower than 1 / 125 second shutter. As a result of slow shutter speeds 3-4 stops allowed by the SE, the captured image at a speed of 1 / 125 seconds in a conventional lens can be taken in 1 / 15 1 / sec with IS-equipped lens 8 and almost the same quality. Sharpness is obtained at a certain speed can increase dramatically. [1] In calculating the effective focal length, it is important to account for digital cameras by the user. For example, many digital SLR cameras with image sensors of 3.2, 5.8 or 1 / 2 frame size of 35mm film. This means that the frame of 35 mm was 1.5, 1.6 or 2 times the size of a digital sensor. These values ​​are defined as the factor of the last harvest, the crop factor of field of view, focal length multiplier, or for reasons of format. Growth chamber with a factor of 2x, for example, a 50mm lens works in the same field of view as a 100mm lens used on a 35mm film camera, and usually can be handheld at 1 / 100 per second.

However, the image stabilization does not prevent motion blur caused by subject movement or camera shake. Image stabilization primarily designed for and is able to reduce blur resulting from normal minutes, shaking the lens due to hand shot. Some of the lens body and the camera or the "way" the second panorama mode is more aggressive, both described in more detail later in the optical image stabilization.

The image stabilization, features can also be useful for photography with the camera is technically effective, but not fixed in place. Pentax K-5 and Cr can use sensor shift its ability to reduce exposure Star trails in a timely manner when an accessory is equipped with GPS position data. Consequently, stabilization compensates for the motion of the Earth, not the camera.

There are two types of deployments - based stabilization in the lens or body-based. See where the system is stabilizing. Both have advantages and disadvantages.

Image stabilization (IS) is a family of techniques used to reduce the blur associated with camera movement during exposure. In particular, the offset and tilt (angular motion equivalent to yaw and pitch) of a camera or imaging device. It is used in image-stabilized binoculars, still and video cameras, and astronomical telescopes. Camera, camera shake, especially problems in the slow shutter speed or focal length (telephoto) lens. The use of video cameras, camera shake causes visible frame by frame instability in the recorded video. Astronomy, the problem of lens-rock added by variations in the air from time to time, causing the apparent position of the object changes.

Optical Image Stabilization

A comparison of close-up photographs of the keyboard and optical image stabilization.

A optical image stabilizer, often abbreviated as OIS, IS, or the operating system is a mechanism used in the camera or camcorder that stabilizes the recorded image by varying the optical path of sensor. This technology has been applied to the lens itself or by moving the sensor as the last element in the optical path. The basic elements of the optical image stabilization system is to stabilize the projected image on the sensor before the sensor converts the image into digital information.

Digital image stabilization

Real-time digital image stabilization is used in some video cameras. This technique shifts the electronic image of the video frame by frame, enough to resist movement. Using the pixels outside the boundaries of the framework aims to provide a buffer for the movement. This method reduces the annoying vibration or improve video image quality by allowing a person to increase exposure times without blurring the image. This method does not affect the level of image noise, except in the extreme limit, when the extrapolation of the image.

Unfortunately, there are still many camera companies market their cameras' digital image stabilization, "when in fact it has a way of sub-optimal exposure time of the image, producing images with less blur, but more noise.

The main disadvantage of this solution is that the lack of definition of rock in the middle of low-light conditions is impossible to correct through post-processing system, image stabilization, so in real life works only for a short exposure time (day).

Title Post: Optical dan Digital Image Stabilization
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