measure height of object in millimeter

If I have these details (FOV, distance between the object and the lens, object height in pixels), is it possible to measure the object's height in millimetres, provided that I am unable to measure the physical height of the object?

Answer 1

[Image Analyst]

Yes. If you know the FOV (field of view) in mm then you can. Of course you know the size of your image. So the spatial calibration vertically = (FOV in mm) / (num rows in image array)

mmPerPixel = size(imageArray, 1) / FOVinMm

So now, for any arbitrary object height in pixels in your image, it's real world height in mm is

heightInMm = heightInPixels * mmPerPixel

[Walaa]

Thank you.