Relationship between the size of the object and the distance to the camera

Question

Hi I need to know if there is any way to detect circular objects with known actual size and image of known depth at different distance from the camera .

Or what is the same thing I need to know if there is a relationship between the size of the object and the distance to the camera.

For example a circle 1 inch in diameter is smaller than 5 meters from the camera, but the same object at 1 meter from the camera image obtained of the object is greater , that is the relationship I need.

Greetings .

score 2 · Answer 1 · answered Nov 12 '14 at 21:33

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An object's apparent size within a field of view decreases linearly as it's distance from the viewer increases. So, a circle that appears 1 inch in diameter when 5 meters from the camera will appear to be 5 inches when 1 meter from the camera.

answered Nov 12 '14 at 21:33

Casey Rule

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score 1 · Accepted Answer · edited May 23 '17 at 12:20

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I've got the solution in OpenCV: How-to calculate distance between camera and object using image?

distance_mm = object_real_world_mm * focal-length_mm / object_image_sensor_mm

edited May 23 '17 at 12:20

Community

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answered Feb 16 '15 at 23:01

user3704922

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Relationship between the size of the object and the distance to the camera

2 Answers2