| Added | Thu, 06/10/2016 |
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There are different shooting modes for various video cameras. In particular, they may vary the number of frames per second. There may be more than the standard 25 or less.
Modes with a reduced number of frames per second commonly used in video recorders and street cameras to save space on your hard drive. While the frame rate can reach even one frame in several minutes. In this survey a number of fast-moving objects may not be visible or blurred.
For example, a person walking on foot, it takes about 1.2 m/sec, passing through the field of view with a width of 6m in about 5 seconds. and running man covers the same 6-metre field, approximately 1, 25 h, i.e. within seconds, it runs a distance of 4.6 m. Therefore, if the speed is 1 frame/sec, then during this time, people can easily cover the distance from 1.2 m to 4.6 m.
What affects frame rate in the video:
- Slow shutter
- Frequency range of video signal
- Frame rate per second
The average frame rate in the cameras ~8-10кадр/h
It is worth considering that some manufacturers release a camera with a slow descent, just copying the same frequency again and again. For example, if you have a descent equal to 1/15 sec, you can only get 15 exposures and, therefore, 15 frames. And if you increase the frame rate to 30, each frame will be recorded twice. In addition to the diffuse image, that gives the loss of personnel.
Translated by «Yandex.Translator»
When the object runs through a field of view at 30 frames/sec camera still catches him in the middle of the road.
Translated by «Yandex.Translator»
In the example with 1 frame/sec, only one shot was recorded by man, between the frames of the field of view remained empty, in the second frame we can see only his leg.
Translated by «Yandex.Translator»
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