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With the sensor size, image pixel resolution, focal length, and known subject size, you can back-calculate (well, estimate) the distance between the camera and subject (assuming that the subject is reasonably parallel to the camera sensor plane).
26 gru 2012 · I want to calculate the distance to specific objects in given images, without having the camera. This is a Canon EOS 60D with distortion correction. From the EXIF tags in the JPEG images I can retrieve the focal length. I know the object's dimensions in millimeters.
15 kwi 2017 · The ratio of the object’s length to the camera to subject distance is 10 ÷ 50 = 0.20. This object's image length will be 100mm X 0.20 = 20 mm long. Using the same ration idea: A 100mm lens is used to image an object 10 feet long. The image of this object at the focal plane is 20mm long.
16 lip 2016 · To work out the size of the object on the sensor, work out it's height in pixels, divide by the image height in pixels and multiply by the physical height of the sensor. So the whole sum is: $$ \textrm{Distance to object}(mm) = \frac{f(mm)\,\times\, \textrm{real height}(mm)\,\times\, \textrm{image height}(pixels)} {\textrm{object height}(pixels ...
15 lip 2016 · Knowing the apparent size of the sphere from the photo and all internal camera parameters is it possible to estimate the distance from the camera to the sphere? There is an equation, more used in lens imaging that is useful: object_image_size = (real_object_size * lens_focal_length)/object distance.
21 wrz 2022 · Understand how to calculate distance between two points / objects in an image or video. Convert pixel distance to real world measurements. Conceptualize how estimating distance can be applied to other use cases. Components of Computer Vision for Measuring Distance.
22 cze 2023 · pixel size = 2 * tan ( horiz.fov /2 ) * distance / image width in pixels. So at 50 mm on 12 Mpx full frame at 5 m distance you get. tan (39.6°/2) * 5000mm / 4000 = 0.45 mm
