What is fps?

What is fps (Frame per Second)?

Each time you press the shutter button while taking a picture, 1 frame picture is taken. The video image is based on the principle that these pictures are taken and played back in succession. fps That is, the number of frames per second means how many frames the 1-second portion of the video image is.

Since analogue security cameras do not process the image within themselves, it cannot be said to shoot as many frames. However, shutter speed can be mentioned in analog cameras. This type of camera has a shutter speed between 1/50 or 1/60 sec and 1 / 120.000sec. The shutter speed can be defined as capturing 1 image (frame) between two screens, just like the shutter release event on the camera. The camera produces the signal of a 1-frame picture between both fences. However, the shorter the interval between the two screens, the less light the camera will receive. For example, an image taken at a screen speed of 1 / 120,000 sec is darker than an image taken at a screen speed of 1/60 sec. The reason is that the time taken for the camera to produce images is 1 / 120.000 in the first and 1 / 60sec in the second.

In situations where ambient light is insufficient, more light can be produced by bringing in more light with the highest folding speed. But this situation brings with it another problem. Particularly in applications such as reading the license plates of moving vehicles, the road that the vehicle travels within 1 / 60sec leads to riding on the picture. This causes blur. For example; An analogue camera for reading the license plate of a car traveling at 50km / h includes:

50km / h = 13.89 / s. So the vehicle is displaced at 13.89m per second. If my camera is operating at a shutter speed of 1 / 60sec, it takes 13.89 / 60 = 0.23m = 23cm to produce the 1 frame signal of the camera. Between the beginning and the end of the square, the vehicle was displaced 23 cm. In this case, the image created by the moving vehicle on the camera will be blurred. If we capture the image at a screen speed of 1 / 1,000, the vehicle will only travel 1.4cm during this time, which reduces the blur on the image and makes the license plate readable. Faster blur pictures can be achieved with higher shutter speed.

As we mentioned at the beginning, a lower shutter speed will cause the image to darken and in this case it will be necessary to illuminate the environment.

Network Cameras perform image processing in their own and send the data to the recording and monitoring side in packets. Generally, network cameras take 25 images (PAL) every second when taking video images. 25 frames in the Pal TV system and 30 frames in the NTSC TV system are standardized. Advanced network cameras are also capable of capturing images at 60fps and higher.

It should not be forgotten that network cameras produce images depending on the screen speed just like the analog camera. Since the network cameras produce and pack images in itself, the number of frames per second (fps) of the camera is set on the camera.