Re:Show HN: ShakyDraw – Hand-drawn block diagrams from plain...
by ocrcustomserver on Wednesday June 21, 2017 @07:12PM
(#14608796)
MyScript offers an API that does this. You need to feed it all the motions/sequence of points that make up the shape (known as "online OCR"), it won't work with a static document.
Demo: https://webdemo.myscript.com/views/shape.html