Measuring the physical distance between two points on an image

Suramrit
11 ●1

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?

add a comment

1 answer

Sort by » oldest newest most voted

answered May 4 '14

Philippe
21 ●1 ●2

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.