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Measuring the physical distance between two points on an image

asked 2014-05-04 01:02:31 -0500

Suramrit gravatar image

As a requirement for a project, I need to find the walking step distance taken by a person, whose image while walking has been acquired. I have acquired a binary silhouette of the person using background subtraction and now need to calculate the actual physical distance of the step. Is there a method to convert pixel distance to physical distance in OpenCV? And if not, then what method can be applied to achieve the same?

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answered 2014-05-04 02:32:21 -0500

Philippe gravatar image

If you have a reference size somewhere in the image, you can use this. Possibly the height of the person if the image is taken at the correct angle. For all cases you will require a form of reference, either from a previous image in the same location, or a set of features on the same image as your silhouette.

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So you mean I take a measured object in the image and use that to calculate the distance of the step? How do I use this reference, any ideas?

Suramrit gravatar imageSuramrit ( 2014-05-05 12:45:34 -0500 )edit

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Asked: 2014-05-04 01:02:31 -0500

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Last updated: May 04 '14