Add GUI alignment tool

[hujunhan]

Thanks for the work! I am working on a similar project for myself, your code is handy, but manual alignment can be tedious.

I wrote a Python script that utilize OpenCV GUI module that can capture mouse click event and help users align the eyes easily.

The script assumes users has already run the main.py and only require the input directory

Then the image that not aligned (that lx is null) would be read by OpenCV and opened in a window, user just need to click the left eye and right eye in order.

The new alignment file would replace the original one and the original one would be backup to .eyelign.bak

Hope this can help!

[dullage]

I like this idea, great job 👍🏻. When I get some time I'll work this into the main app.