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How does animation form: The videos we usually encounter are either 30 frames or 60 frames per second, which means that 30 or 60 different consecutive images are switched every second. The principle of how a gyroscope can form animation is also based on this law.
Why can't we see the animation of a gyroscope with the naked eye: because the refresh rate of our eyes is very high, so when the gyroscope is rotating, we have already seen it turn, and we cannot see the still image.
Why sometimes there is animation and sometimes there isn't when taking a picture: Because when you choose a video format with 30 frames per second, the gyro needs to rotate 30 times per second/6 (6 frames) to freeze the frame, thereby generating animation.
Why must you only be able to take out the animation in the sun: The previous question mentioned that only by freezing the picture can the animation be formed, so we need to talk about a single picture. A picture is composed of aperture, light sensitivity, and shutter speed. When we take a picture of a moving vehicle at night, there is always a trail effect, because the light is too dark and the shutter speed is not fast enough. Then, when we come back to the gyro, we need to have enough light to freeze the picture when it is rotating at high speed. We must have a high shutter speed to meet the automatic shutter of the mobile phone, so that it can freeze every frame of the rotation.
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