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I am quite new to image processing. I have experimented with opencv and tried to measure the lenght and width of an object from a picture using a reference object where I know the dimensions.

See this Link https://www.pyimagesearch.com/2016/03/28/measuring-size-of-objects-in-an-image-with-opencv/

Thats working quite well, as long as the objects have the same depth. Two quarters but the right one is way closer to the camera

Is there a way to determine the distance of the object by algorithms when the camera is fixed? I was thinking about ultrasonic sensors, but I would need quite alot of them to make this work. Any other ideas? I appreciate any help :)

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