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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 · there is no such function available in opencv to calculate the distance between object and the camera. see this : Finding distance from camera to object of known size. You should know that the parameters depend on the camera and will change if the camera is changed.
10 kwi 2019 · Following the steps to Calibrate the camera were really straight-forward, but the challenge for me in this journey was how to calculate real-world X Y Z coordinates from a given Image’s projection points.
22 cze 2023 · Calculate object size when I have physical pixel size, or How do I calculate the distance of an object in a photo? \$\endgroup\$ –
You measure the visual size of an object in the image by determining the number of pixels it covers. If it covers 1/4 of the pixels, then it covers 1/4 of the sensor mm. This is easy to do when the photo editors tell you the size of the crop box that you mark.
16 lip 2016 · To solve this problem we may use two or more images to measure the distance. Provided you can measure all angles and distance between two camera positions, you can also calculate distance to the remote object. But measuring all angles is not an easy task.
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.
