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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
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.
24 kwi 2024 · Learn how to gauge the size of real-world objects with the Measure app and your iPhone, iPad, or iPod touch camera. And learn how to measure objects and people more easily using the LiDAR Scanner on supported Pro devices.
8 cze 2017 · How to calculate the size of object in pixels, knowing the camera properties? Ask Question. Asked 7 years ago. Modified 7 years ago. Viewed 1k times. 0. I'm trying to calculate the size of an object in pixels in an image, when I have these information: x * y = the size of the real object in meters. q = the quality of the image in dpi.
