Calculating height of an object in an image giving more error percentage than calculating width

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP



Calculating height of an object in an image giving more error percentage than calculating width



My application’s requirement is to measures object of interest’s height and width from the captured image.



I am thinking of implementing formulae behind scantips website.



I was checking the accuracy of scantips and found that width measurement is more accurate than height.



I entered iPhone 7’s focal length 3.99 and crop ratio as 28/3.99 = 7.0175438596. 28 is focalLenIn35mmFilm. I got this info from captured image’s EXIF data.
I entered the image height, height of object in image and manually calculated distance from that object.



Observation: Height is giving more error percentage than width. Width’s error percentage is around 2-4% but height’s is more than 10%.



Any pointers in the right direction will helps a lot.





Show the captured image itself and give actual / measured dimensions.
– meowgoesthedog
Aug 10 at 9:29









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