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How can I find an object distance in an image??

Asked by Tomas on 8 Dec 2012

Hi,To find the an object distance (working distance) in an image, I can do this

object distance = focal length*((1/magnification) + 1)

thanks

1 Comment

Jan Simon on 8 Dec 2012

Currently I do not see the relation between your question and Matlab. Because this is a Matlab forum, your problem might be off-topic.

Tomas

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1 Answer

Answer by Jürgen on 8 Dec 2012
Edited by Jürgen on 8 Dec 2012

hi, first Your question is not clear? second, on a single image you can not extract object distance,=> you need stereovision, or other techniques like depth from focus or special cameras( Time Of Flight) I suppose you refer to the thin lens equation but this is only for an object in focus

regards, J

3 Comments

Tomas on 8 Dec 2012

what's the difference between camera distance, image distance and working distance in this link http://coinimaging.com/blog1/?p=46

Jürgen on 8 Dec 2012

Hi, to be honnest I do not have the time to read the link but for me: image distance is the distance between the plane where the image is formed and the lens center, and object distance is the distance between the object in focus and the lens center , camera distance is not so clear define for me , I do not use it actually, if you want to do measurements on images start by looking at the pinhole camera model , there you have the image plane at focal length of the lens center

Jan Simon on 8 Dec 2012

@Thomas: Please read the text of the posted link again. The term "camera distance" is defined and in the previous chapter you find "image distance" also.

Jürgen

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