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Measure the actual size of the object?

asked 2018-09-07 05:55:09 -0500

monxarat gravatar image

updated 2018-09-07 08:23:34 -0500

Hi guys, If I have the extrinsic and intrinsic matrix of the camera. Can I measure the actual size of the object?

Can't I do that with below?

The AR how to do that? image description

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the intrinsic matrix has the fov, but you still need the distance.

berak gravatar imageberak ( 2018-09-07 06:09:18 -0500 )edit

you have any ideas?

monxarat gravatar imagemonxarat ( 2018-09-07 08:34:50 -0500 )edit

Thank you so much. This wiki I have read it. The same as this http://ksimek.github.io/2013/08/13/intrinsic/

monxarat gravatar imagemonxarat ( 2018-09-07 08:47:05 -0500 )edit

so, where's the problem, now ?

real_size = fov * measured_size / measured_distance.
berak gravatar imageberak ( 2018-09-07 09:07:13 -0500 )edit

How to measure distance(measured distance) auto? You can explant me how to?

the AR how to do that?

monxarat gravatar imagemonxarat ( 2018-09-11 04:04:16 -0500 )edit

Have not measured_distance value? How to auto measure it.

monxarat gravatar imagemonxarat ( 2018-09-19 00:07:03 -0500 )edit

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answered 2018-09-07 07:19:57 -0500

LBerger gravatar image

No and no again... I take a picture :

What is clock size ?

image description

image description

image description

Ayache [1989]

Vision Stéréoscopique et Perception Multisensorielle Intereditions

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How to measuring like AR? Do you have any ideas?

monxarat gravatar imagemonxarat ( 2018-09-07 08:40:44 -0500 )edit

For some AR methods the markers used are of a known size so this provides scale information.

maym86 gravatar imagemaym86 ( 2018-09-07 13:17:23 -0500 )edit

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Asked: 2018-09-07 05:55:09 -0500

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Last updated: Sep 07 '18