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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).
10 sie 2022 · The iPhone 13 camera megapixels clock in at "just" 12MP – yet it blows away some 48MP and even 108MP phones. (Image credit: James Artaius) It's crazy to me. My iPhone 13 camera megapixels amount to just 12MP – a resolution that seems positively paltry on paper.
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: $$ \textrm{Distance to object}(mm) = \frac{f(mm)\,\times\, \textrm{real height}(mm)\,\times\, \textrm{image height}(pixels)} {\textrm{object height}(pixels ...
20 wrz 2022 · The Apple iPhone 13 Pro uses its ultra-wide camera when switching to macro mode, allowing it to capture images at very short distances. The resulting magnification is close to 1:1 with a pretty interesting level of detail at the center of the frame .
In addition, call the distance between the camera and the two points $L$. The camera's field of view ($FOV$) (or angle of view as is more common in photography) can be calculated by $$ FOV = 2\arctan\left(\frac{d}{2F}\right) $$
15 kwi 2017 · Measure the area of an object in an image by using fx and fy and given distance (distance between camera and object pixel-wise)
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
