Android Question How to read segment display?

Hello,

I would like to read the display of my digital multimeter,

I found an App "Yomzo" that uses "OpenCV Manager", does anyone know how to read segment display?

The App:
https://play.google.com/store/apps/details?id=jp.gr.java_conf.coskx.ddreader2.trial

The OpenCV Manager:
https://play.google.com/store/apps/details?id=org.opencv.engine