VietOCR v6.17.0 & VietOCR.NET v6.15.0 Releases
The scanning function only works in Linux 32-bit. We don't know how to generate the jsane binary suitable for Linux 64-bit, which is much more prevalent nowadays. Maybe in the next release, we'll hide the function in the user interface to avoid confusion to the users. https://github.com/nguyenq/VietOCR3/issues/6
Yes, it can be. https://github.com/java-native-access/jna/blob/master/www/DirectMapping.md
Leptonica library has many dependencies to open various image file types, such as TIFF, PNG, JPEG, etc., which in turn have other dependencies, as you've seen. On Windows, we were able to embed all the image library dependencies inside libleptonica.dll. We don't know how to generate a similar static library liblept.so on Linux. Installing Tesseract would ensure installing of all the required dependency libraries.
Please use the JNA Direct Mapping API — Leptonica1. https://tess4j.sourceforge.net/docs/index.html
VietOCR v6.15.0 & VietOCR.NET v6.14.0 Releases
jTessBoxEditor v2.6.0 & jTessBoxEditorFX 2.6.0 Releases
VietOCR v6.14.0 & VietOCR.NET v6.13.0 Releases