What are the DORI levels?

Detect 25, Observe 63, Recognize 125 and Identify 250 pixels per metre of scene width. They describe what a person can tell from the picture.

Why the narrow end of a varifocal?

It gives the most pixels per metre. The page also shows the wide end, because the scene gets narrower as you zoom in.

Mounting height, tilt, light, compression and lens quality. It is the best case from geometry alone.

Free · no account

Which lens do you need to identify someone at this distance?

Pick a camera and a distance. The calculator uses the sensor and lens from the datasheet and shows how far each DORI level reaches.

Find the camera

Distance to target

What do you need at that distance?

From the datasheet

Horizontal resolution · not in datasheet, enter manuallypxHorizontal FoV · not in datasheet, enter manually°Sensor · not in datasheet, enter manually—

—

Enter the resolution and the field of view to see the result.

Find cameras that identify at 25 m

How it's calculated

Enter the resolution and the field of view to see the result.

Overlay cameras and see the face at that distance

Camera Compare's FoV tools add overlays, image simulation, mounting geometry and the lens finder.

See a demo site →

Questions

What are the DORI levels?: Detect 25, Observe 63, Recognize 125 and Identify 250 pixels per metre of scene width. They describe what a person can tell from the picture.
Why the narrow end of a varifocal?: It gives the most pixels per metre. The page also shows the wide end, because the scene gets narrower as you zoom in.
What is not counted?: Mounting height, tilt, light, compression and lens quality. It is the best case from geometry alone.

Which lens do you need to identify someone at this distance?

How it's calculated

Questions

Related