From the orientation of palm, I need to detect the palm is left or right, and also I want to extract the lines from the palm, is there any PHP library available ? or how can I use canny in php
How to recognize palm lines from a palm image using php
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I doubt very much that there's a native library in PHP for this sort of thing. It's not exactly the language of choice for complex image recognition.
You can call external programs in PHP with
exec(),system(),passthru(),popen()andproc_open(). Read here about how they work and what the differences are. You can then use Canny or other software of choice with their usual command line usage.