Text Recognition (OCR) Program in a Dedicated Area of the Screen

There was a need for a program with a simple graph. interface. The program must recognize the characters from the specified area of the screen and copy them to the clipboard. The recognition area (this is a java application and at each run the position of the window can change) is set in the interface through the input of coordinates on the screen.
Symbols are capital Latin letters up to 5 characters without spaces in one line.
Format of the region with symbols for recognizing 2 types:
1. Invariable format
The symbol height is 8px, font is black, background is yellow.
(example of text enclosed)
2. Modified format (java app allows you to change the format of the font and background in this field)
Symbols up to 13px, font black, background white or background black font white, Arial or Verdana font
(example of text enclosed)
The symbols in a given field are dynamic, constantly changing, but not more than once per second.
The software must track the change in the field and if the characters in the field have changed, then transfer new values to the clipboard and display them in the program interface graph. It is advisable to play the signal (sound file) after changing the value.
It is important to correctly transfer symbols without errors, speed, the possibility of several running programs in parallel, the delay between the appearance of a new value and transfer it to the buffer no more than 1-2 seconds. (additional description)