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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 cze 2021 · One of the primary beneficiaries of LiDAR in the iPhone 12 Pro is Apple's Measure app, which scans its environment and then lets you tap specific points to calculate distances, lengths, areas, and more.
The camera's field of view ($FOV$) (or angle of view as is more common in photography) can be calculated by $$ FOV = 2\arctan\left(\frac{d}{2F}\right) $$ which, for a scene at distance $L$ corresponds to a scene dimension $W$ equal to
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.
Use the Measure app and your iPhone camera to measure nearby objects. iPhone automatically detects the dimensions of rectangular objects, or you can manually set the start and end points of a measurement. For best results, use Measure on well-defined objects located 0.5 to 3 meters (2 to 10 feet) from iPhone. (Measurements are approximate.)
17 wrz 2018 · How to Measure Distances With Your iPhone. Your iPhone now contains a "Measure" app that acts as a high-tech tape measure. Just launch the app, point your camera at something, and it will measure dimensions of objects in the real world. This is one of the many new features in the iOS 12 update.
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.
