How to measure length of an object in a photo in javascript

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I want to measure length of an object from photo.

How can I do it?

Please help me.

What I have tried:

I got some codes in opencv but I want it in javascript so that I can use it on web app.

Posted 20-Aug-20 3:43am

Member 14589077

Updated 20-Aug-20 4:41am

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Richard MacCutchan 20-Aug-20 11:12am

You need a frame of reference. e.g the scale of the picture and the actual dimensions of some feature in the image.

Member 14589077 20-Aug-20 12:34pm

thanks

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Dave Kreskowiak · Answer 1 · 2020-08-20T04:41:00

Solution 1

There is no one way to do this. There are many techniques, but not every technique is going to be valid to use for every photo.

Start doing some research on this by Googling for "measure length of object in a photo". You'll come up with lots of results for various techniques.

Posted 20-Aug-20 4:41am

Dave Kreskowiak