The difference between optical image stabilization and electronic image stabilization

Optical image stabilization. Optical image stabilization is done using a set of lenses (PSD lenses) that can be moved up, down, left, and right (PSD lenses) mounted in the lens. When the hand shakes, the detection circuit detects the direction of the jitter, and controls the PSD lens to move accordingly through the control circuit to compensate for the jitter.

This method has a good compensation effect, and there is no loss of the picture after compensation, but the circuit and optical structure are complex, and the cost is relatively high, and generally only high-end 3CCD cameras are equipped.

The CCD image stabilization used by some brands is actually another form of optical image stabilization. The principle is to place the CCD on a bracket that can be moved up and down, left and right, and first detect whether there is jitter, and the detection of jitter is basically the same as that of other companies due to the use of gyro sensors. The sensor then detects the direction, velocity, amount of movement, ...... of the jitterThe detected signal is processed to calculate the amount of CCD movement that can be sufficient to counteract the jitter.

Electronic image stabilization. Electronic image stabilization uses digital circuits to process the image and produce an image stabilization effect. When the anti-shake circuit works, the shooting picture is only about 90 of the actual picture, and then the digital circuit makes a fuzzy judgment on the camera shake direction, and then uses the remaining 10 or so images to compensate for the shake.

This method is characterized by low cost, but it reduces the utilization rate of CCD, which will bring a certain loss to the clarity of the picture, and is not very helpful for the still images captured by DV. Most low-end single-CCD cameras have electronic image stabilization.

When shooting still images, some DV and DC models (such as Fujifilm digital cameras) are available. There is also a so-called natural stabilization technology. The principle is simple: to compensate for the jitter by increasing the ISO sensitivity and thus increasing the shutter speed.

Obviously, this technique greatly increases the noise of still images** and reduces the usefulness of the image.

There is no doubt that optical image stabilization is better than electronic image stabilization in terms of technology and final results.

If you deliberately shake it. So is the shutter slow, because the shake amplitude set by the lens is not very large? If you hurry up the shutter, it won't be very blurry.

As an optical image stabilization technology, it does not make the body shake, but relies on the structure of a special lens or CCD image sensor to minimize the instability of the image caused by the shake during use. Stabilization through lens groups is mainly represented by Canon and Nikon, which rely on magnetically wrapping levitating lenses to effectively overcome image blur caused by camera vibration, which is more effective than digital cameras with large zoom lenses. Normally, the gyroscope in the lens detects a slight movement and transmits the signal to the microprocessor to immediately calculate the amount of displacement that needs to be compensated, and then compensates for the direction and displacement of the lens according to the direction and displacement of the lens by compensating the lens group, so as to effectively overcome the image blur caused by the vibration of the camera.

At present, only Konica Minolta can achieve image stabilization through CCD, and its principle is contrary to Canon's and Panasonic's optical image stabilization technology, which relies on the floating of CCD to achieve the purpose of image stabilization. The principle is to fix the CCD on a bracket that can move up and down, left and right, and sense the direction and amplitude of the camera shake through the gyroscope, and then the sensor transmits the data to the processor for screening and amplification, and calculates the amount of CCD movement that can offset the jitter.

Electronic image stabilization, on the other hand, reduces the effect of shake by increasing the shutter speed. However, there is a lot of noise.

In layman's terms, electronic image stabilization means that the shooting thing is shaky, and then through a series of electronic imaging technologies to make the picture look shaky, which must be achieved at the expense of clarity and increased noise.

Optical image stabilization is to compensate for the shaking direction of the lens or image sensor and the fuselage through physical technology, and strive to make the shooting picture stable, of course, it will also sacrifice a certain degree of clarity, but the imaging is basically non-shaking, but due to the complex structure of the optical image stabilization device, it causes high production costs.

The first thing you need to know is that when the shutter is too slow, the shaking of the hand will cause the blur of the photo, and the slower the shutter speed, the worse the blurring, and the reciprocal of the focal length of the lens is generally used as a safe shutter, that is, the shutter that will not slip (your hand is crazy and shaking non-stop).

And the role of stabilization is to lower the safety shutter by a few stops.

For example, if the focal length of the current lens is 60, the safe shutter speed is 1 60 seconds, and below this value, it may be pasted, and the lower the blur, the worse the blur. Now with anti-shake, you can lower the safety shutter in two stops, then the safety shutter becomes 1 15 seconds, and if it is less than 1 15 seconds, it will still be pasted, but it will not be blurred when it is higher than 1 15 seconds.

So stabilization doesn't mean that you can deliberately shake without sticking, but just lowering the safety shutter.

Electronic image stabilization relies on methods such as improving ISO to achieve the purpose of blocking the capital, although it can also improve the shutter, but the higher the ISO, the worse the image quality, so electronic image stabilization is an image stabilization on the premise of sacrificing image quality. Optical image stabilization has no loss of image quality.

Optical image stabilization is to use the mechanical change of the lens to solve its shaking problem, there is no damage to the image, electronic image stabilization is the use of electronic deterioration technology, similar to the feather technology of ** processing, the image quality has a certain impact.

Optical image stabilization stabilizes the image by adjusting the incoming light by moving the lens and lens group.

Electronic image stabilization analyzes the image on the CCD, and then uses the image at the edge to compensate for the jitter.

Optical image stabilization stabilizes the image by adjusting the incoming light by moving the lens.

Electronic image stabilization analyzes the image and then compensates for the image at the edges based on the jitter.

Optical image stabilization of mobile phones is necessary. On the other hand, mobile phones with optical image stabilization can confidently and boldly reduce the shutter speed to get more light in, so the night scene is brighter and the picture is purer. A phone with optical image stabilization is basically better than a phone without optical image stabilization.

Optical image stabilization is the gyroscope in the phone at the moment when the phone clicks to take a photo.

Detect mobile phone shake, and then after algorithm analysis and processing, command the floating lens or CMOS reverse shake, so as to offset the impact of mobile phone shake on imaging from the hardware.

In the general photo mode, the role of optical image stabilization is still relatively obvious, especially when shooting while walking, optical image stabilization can play a certain stabilizing role, but because the mobile phone's anti-shake system is a little different from professional cameras and lenses, so if the mobile phone shake amplitude is relatively large, the anti-shake effect is not obvious, plus the lens aperture and image sensor of the mobile phone are relatively small, so in the shutter speed.

In the case of slower conditions, the effect of optical image stabilization will also be affected.

Although it is still a bit far from the gibilizer, some devices have done a pretty good job of stabilization, such as Apple's iPhone 7

Series and above models,Or Samsung's S8 S9 series and Note8 series,These models are even if they hold a mobile phone while walking and shooting,The picture is relatively stable,Basically there will be no dizziness。

The screen shakes.

The biggest optical image stabilization of the mobile phone should be on the shooting, because we shoot a lot of times while walking, or sitting in the car, etc., anyway, in a relatively rare case, we will use a tripod to fix the mobile phone to shoot**, with the optical image stabilization function, the shooting of ** is greatly improved in terms of the stability of the picture.

Optical image stabilization

1. Improve the film yield: To put it bluntly, optical image stabilization can offset the shaking of the mobile phone to a considerable extent, and it is not easy to take pictures with the mobile phone.

2. Improve image quality: If you don't have optical image stabilization, when shooting night scenes, the phone will increase the shutter speed to prevent paste**. However, when the shutter speed increases, the amount of light will be smaller, resulting in a very dark and noisy picture. Severe.