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28 lut 2022 · I want to measure distance between pupils within a precision of 2-3 mm. I'm considering to use a credit card held on forehead so that distance in pixels can be converted into mm. I have tried some libraries (such as opencv and dlib) but failed to achieve that precision.
4 kwi 2016 · Discover how to measure the distance *between objects* (in inches, meters, etc.) in an image using OpenCV, Python, and computer vision + image processing.
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.
18 gru 2015 · If you know an approximate actual size dimension of something in the one picture (and if you know focal length and sensor size), you can estimate its distance using the calculator at http://www.scantips.com/lights/subjectdistance.html
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.
Measuring your own PD. If you’d rather measure your PD yourself, or get a friend to help you out, have a look through our step-by-step guides. Stand about 30cm away from a mirror. Looking at yourself, hold a ruler up against your eyebrows. Close your right eye, then line up the ruler so that 0mm is in line with the middle of your left pupil.
Measure your pupillary distance (PD) PD is the distance between your pupils, and it's used to help center a prescription correctly in your frames. Before using our PD tool, review the steps below.
