research

• deskew: used Retinex
• dewarp: full RANCAS
• filters: refactoring all
• k-means: Fg/Bg separate
• k-means: find Black and White
• output: refactoring and fix FillZones and Margins

All changes in this release were made during the processing of a book with complex content:

Макаров А.Б. "Практическая геомеханика", 2006

All solutions were immediately checked and finalized using this book, with being cleared and processing starting again.

At the moment, the book has been completely processed and is being encoded into PDF. All solutions worked out successfully.

PS: Result of processing the specified book

Build for Windows; flatpak by @plzombie .
Build for Debian GNU/Linux by @zvezdochiot .
Build for Mac by @gasparschott .