batch split note scans with automatic recognition of parts in page

Question

I regularly use paper to make notes and concepts for most things, work and others. To be quick when having an idea I note them one after another, just to make sure I find things later, I use paper with a sidebar where I add some short tags. On top also the current date.

I am now in the process of making them accessible digitally. First step was obviously scanning them. (stored in folder per month)

Now I want to push them in some content system.

I need now a way, semiautomagically

• view page by page
• computer checks for horizontal lines or part of lines and set sections.
• I control and correct
• computer recognizes tags in sidebar, I correct if necessary
• image is cut in parts
• The parts are saved by tags (and maybe date, at least keep the month)

I like to ask for suggestions for tools I could play with, a kind of gui for imagemagick crop in the most simple case. Of course I could code such tool quite easily but I thought I ask here first, often you guys have awesome ideas.