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The key to this is knowing the camera's sensor size. 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).
Measure dimensions with iPhone. 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.
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
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.
26 gru 2012 · c_x = 1637. c_y = 1271. Checking the details of the series of chessboard photos you took, you will find the native resolution (3264x2448) of the photos and in their JPEG EXIF headers, visible in iPhoto, you can find the Focal Length value (4.15mm). These items should vary depending on camera.
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.
8 paź 2021 · Read on to find out how the all-new iPhone 13 camera performed in our DXOMARK Camera tests. Key camera specifications: Primary: 12 MP sensor, 1.7µm pixels, 26 mm equivalent f/1.6-aperture lens, Dual-Pixel AF, sensor-shift OIS; Ultra-wide: 12 MP sensor 13 mm equivalent f/2.4-aperture lens, 120-degree field of view
