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cameradetectionimage-recognitionidentificationfieldofview
Praneeth
Praneeth

Reputation: 11

calculation of Detection, Recognition and Identification (DRI) ranges of a camera for different objects

I want to calculate the DRI ranges of a camera using it's resolution, focal length , sensor pixel pitch and target real size. I have these values but I didn't find any equations to calculate DRI range values.

for example: I have a camera with the below specifications

Resolution : 640x480; Focal length : 70 mm; sensor pixel pitch : 12 um; Target size : 0.5 meter x 0.5 meter (width x height);

approx. DRI ranges for the above camera is:

Detection : 1940 meters; Recognition : 490 meters; Identification : 240 meters;

**the above values are generated using online DRI calculators

Thanks in advance.

Upvotes: 0

Views: 1011

Answers (1)

RustyG80
RustyG80

Reputation: 11

To calculate DRI ranges you need to do the following:

(focal length * target size) / (your DRI criteria * (pixel pitch/1000))

Looks like the DRI criteria in your case is D=1.5pix, R=5.95pix, I=12.2pix, which is Johnson Criteria converted from line pairs to pixels as I see it interpreted by most people.

Upvotes: 1

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