用于屏幕文本的OCR（光学字符识别）

I'm trying to create a piece of software that automate the PC by capturing the screenshot, then OCR (Optical Character Recognition) it looking for a particular button to click (for example). I've got the mouse and keyboard control part, but now, I needed an OCR to process the screenshot. What I discovered is that Tesseract OCR does not seems to work very well with on-screen text. The text is either too small, or that some of text seems to be connected, like for example K and X. How should I go about this?I'm trying to create a piece of software that a