Our Privacy Friendly App differs from other applications with respect to two aspects: When using the circle, input the diameter of your custom reference. When setting a custom reference, choose which shape the app should provide when using this reference. You can maintain up to 10 custom references simultaneously. If you always have a certain object like a flash drive, a key ring or something else with you, measure the size of that object and enter it as a custom reference. The app allows you to set and manage custom reference objects. Even with manual calibration and perfectly taken picture there are rounding errors which can't be eliminated. Technische Universität Darmstadt is not liable for any damage caused by improper use of this app. Please note that this app isn't a professionally calibrated measuring device and shouldn't be used as such. The precision then depends on how precisely you can measure a line on your screen. If the screen ruler isn't precise enough you can manually calibrate it. That means if your objects of interest and reference are lying on a tabletop, take the picture directly from above while holding the phone parallel to the tabletop. Also make sure that the picture is taken perpendicularly to the level the objects are on. A reference object significantly closer to or farther away from the camera doesn't provide a good reference. To archive the best results when measuring pictures make sure that all objects are in the same level. The app supports metric and imperial units of measurement and has several common currencies as well as US and international paper formats as available reference objects. This feature is available as a standalone Privacy Friendly Ruler app. A protractor for measuring angles can also be displayed. Now the app knows what real life distance a pixel in your picture corresponds to and can measure a length or area you wish to know.įor the times when you only have to measure a small object and taking a picture would take too long the app can also display a ruler on the screen. Then choose what object you used as reference and place the shape shown on the reference object in the picture. Just place an object of known size, like a coin, next to whatever you want to measure and take a picture. This android application lets you measure things on the go when you have only your phone and purse on hand.
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