Science popularization: What is the "frame number" of recorded video| Love to play computer games - 上海419贵族宝贝-上海后花园1314-上海品茶网-阿拉爱上海

We often see data such as "video capture 1920 * 1080, 30 frames/second" in some mobile phone hardware parameters. What does "30 frames" mean? Let's understand the concept of frame number.

The number of frames is the number of pictures transmitted in one second. It can also be understood that the graphics processor can refresh several times per second, usually expressed in fps (Frames Per Second). Each frame is a still image. Displaying frames quickly and continuously forms the illusion of motion. High frame rate can get smoother and more realistic animation. The more frames per second (fps), the smoother the displayed action will be. But the file size will become larger.

(The above content is extracted from Baidu Encyclopedia)

So we can see that the "30 frames" in the parameter actually means that "30 static pictures are taken in one second, and then connected by playing", because the visual residual characteristic of the human eye is that the vision generated by light on the retina remains for a period of time after the light stops acting, because it is caused by the reaction speed of the visual neurons. The time value of reaction speed is one quarter of a second (that is to say, playing more than 24 static pictures per second is a smooth and continuous dynamic picture without jamming to the human eye). It is the basis for the formation and spread of visual media such as animation and movies. Most of the relaxed animations of Japanese TV are produced at 18 frames per second, while American animations are generally 24 frames per second of conscience. As for movies and many film and television works, in order to have a better smooth picture, they usually use 30 frames or more.

Compared with mobile phones, most mobile phones have a video capture capability of only 30 frames per second, whether 720P or 1080P, because of the impact of the machine's image processing capability and storage capacity.

However, with the constant refresh of mobile phone hardware, there are many mobile phones that can record high-speed video on the market, such as:

Xiaomi 2 can use the high-speed shooting function of 90 frames per second when shooting in 720P format.

Because of its powerful hardware, Find5 can even record 120 frames per second of video after reducing to 480P.

Of course, the high-speed video used on mobile phones is not mature, because the shooting effect is always not ideal due to the limited writing speed of hardware and storage devices. However, this is a good start. At least manufacturers have begun to pay attention to people's demand for high-speed video. Although the demand is not very large, at least

You might think that high-speed video has no effect other than making the video look smoother. In fact, now we see that many slow motion videos are shot by high-speed video, and then played slowly by software to show slow motion videos.

The above small story said that "when the naked eye looks at a static picture of more than 24 frames per second, it will be considered as a continuous dynamic video", so you can shoot a video of 60 frames per second, and then adjust the number of frames per second to about 24 through the software, so that the image you captured in one second can be played into two seconds at a slow speed, and it is continuous and will not get stuck. If you can shoot 90 frames per second of video, you can at least slow down the slow motion playback from one second to three seconds, and so on. High speed video can capture many details and brilliant moments that are easy to ignore. Playing video in slow motion will also make it more interesting, which is why more and more manufacturers are paying attention to high-speed video.

However, this function is not very mature at present. I hope that future hardware development can make this function more mature, so don't talk about "hardware surplus". The rapid development of various functions and software of smart phones will only make them have higher and higher requirements for mobile phone hardware.