Face Recognition

How many pixels do you need to see a person

The number of pixels you need to see a person on CCTV depends on how close you want to be able to identify them.

To detect a person, you need 4 pixels per face. This means that if a person is 1 meter tall, they will need to take up 4 pixels on the screen.
To recognize a person, you need 20 pixels per face. This means that if a person is 1 meter tall, they will need to take up 20 pixels on the screen.
To identify a person, you need 80 pixels per face. This means that if a person is 1 meter tall, they will need to take up 80 pixels on the screen.
The distance between the camera and the person also affects the number of pixels you need. If the person is closer to the camera, you will need fewer pixels to see them clearly.

For example, if a person is 1 meter tall and they are 10 meters away from the camera, you will need 40 pixels per face to identify them. If they are 5 meters away from the camera, you will only need 20 pixels per face to identify them.

What else affects the number of pixels you need?

The following factors also affect the number of pixels you need to see a person on CCTV:

The size of the person's face. A larger face will need more pixels to see clearly.
The quality of the CCTV camera. A higher quality camera will have more pixels.
The lighting conditions. Good lighting will help you see more pixels.
How many pixels do CCTV cameras have?

CCTV cameras come in a variety of resolutions. The most common resolutions are:

720p (1280x720 pixels)
1080p (1920x1080 pixels)
4K (3840x2160 pixels)
The higher the resolution, the more pixels the camera has. This means that you will be able to see more detail in the image.

How many pixels do I need for my CCTV system?

The number of pixels you need for your CCTV system depends on your needs. If you just need to detect people, you can get away with a lower resolution camera. If you need to be able to identify people, you will need a higher resolution camera.

What else should I consider when choosing a CCTV camera?

The following factors should also be considered when choosing a CCTV camera:

The field of view. The field of view is the area that the camera can see. A wider field of view will allow you to see more of the scene.
The night vision. Night vision cameras can see in the dark. This is important if you need to monitor your property at night.
The weatherproof rating. Weatherproof cameras can withstand the elements. This is important if you need to monitor your property outdoors.