Difference between global shutter and rolling shutter of camera

1. The electronic shutter of many digital cameras is equipped with a rolling shutter, and the data in it is read out column by column from the top to the bottom of the sensor, and then reset to the next picture exposure. In an image where the shutter is obviously tilted and will become a vertical line, if there is a camera or a subject passing through the picture quickly.

2. If the reading speed of the sensor is particularly slow and there is rapid movement in the picture, unnecessary dynamic overlap will occur and the whole image will be distorted. Most roller blinds are very fast, which minimizes potential problems.

3, RED and Arri Many cameras have rolling shutters, which are more cinematic than the global shutter. Even for high frame rate cameras, such as Phantom digital cinema cameras, the reading time is only 1 millisecond.

Second, the global shutter

1. The global shutter is different from the rolling shutter. At the end of a complete exposure, the light is completely blocked at one time, and then the data is read and reset for the next exposure.

2. The global shutter keeps the vertical line or the object moves horizontally in the picture. However, the feeling of exercise is obviously different. According to the realization of global shutter, compared with rolling shutter, light and possible dynamic range will only consume a little.

Extended data:

Another concept-safety shutter;

The so-called safety shutter is mainly related to the focal length of the lens. When shooting with a hand-held camera, the shutter speed should not be lower than the reciprocal of the focal length. If shooting with a focal length of 200mm, the shutter speed that can ensure the definition at this time must reach at least1/200 s.

If the focal length of the lens matches the value obtained by the security shutter, but the photo can't reach the correct exposure value, you can achieve the correct exposure by increasing ISO and aperture. Sometimes exposure cannot be improved by increasing ISO and aperture.

Either there is obvious noise, which destroys the image quality, or no matter how to improve ISO and aperture, it is impossible to increase the exposure and improve the brightness of the picture. At this time, it is necessary to slow down the shutter speed and shoot with a slow shutter. At this time, the camera should be fixed, such as on a tripod.

References:

Baidu encyclopedia-shutter