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Is it possible to measure distance to object?

asked 2018-03-11 20:09:42 -0500

TeamAR gravatar image

I would think that it is not possible to do so unless i have the actual size of the object, but I am asking about finding the distance to a certain object (i.e. car) that is detected but without knowing the size of that object, is there a certain technique that is applied in this case that makes it possible?

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answered 2018-03-12 00:46:58 -0500

You are quite right. With one camera you need real parameters of the object so as to restore the distance. If you have no them, you need 2 cameras or move you camera around with constant speed.

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answered 2018-03-12 02:07:56 -0500

Joshitha gravatar image

I think these papers may be of help to you:

Rahman, Ashfaqur, et al. "An image based approach to compute object distance." International Journal of Computational Intelligence Systems 1.4 (2008): 304-312.

and

section 11 of

Sharma, Sachin Umesh, and Dharmesh J. Shah. "A Practical Animal Detection and Collision Avoidance System Using Computer Vision Technique." IEEE Access 5 (2017): 347-358

The latter paper has done this:

image description

  • Image resolution is 640 × 480

  • X range is 0 to 640

  • Y range is 0 to 480

Let the right bottom coordinate of the detected cow be (x, y). Then the distance of cow from the lower edge (car/camera) is 480 – y.

They have then used a formula derived from the first paper to convert distance in pixels to meters

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Asked: 2018-03-11 20:09:42 -0500

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Last updated: Mar 12