Adapt machine learning model for recognizing digits in a screen

I need to develop a model that can identify numbers in a digital screen. This numbers are 7 segment numbers and are used for medical applications.

I attach an example of the screen, we have to recognize the 3 numbers that are displayed. Top middle and bottom.

Model most be done using google colab and tensorflow.

Here is a usefull resource
https://medium.com/analytics-vidhya/digit-recognition-of-digital-meters-using-tensorflow-2-object-detection-api-48364cd678a9