There are 3 repositories under videosubfinder topic.
Extract video hard subtitles and automatically generate corresponding srt files.
hardcoded subtitles extraction tool 硬字幕提取工具(非作者,备份用)
quick and dirty script to OCR hardsubs into softsubs with videosubfinder. isn't good, but works.
OCR automation for VideoSubFinder
PGS SUP subtitle generator (Image sequences), useful companion of VideoSubFinder