What Is Punctuation Restoration?

Direct definition

Punctuation restoration is the step that adds periods, commas, question marks, and often capitalization to raw ASR output that was predicted as an unpunctuated word stream.

The sections below explain how punctuation restoration is used in transcription and subtitle work, what people often mix up, and which VideoText workflow applies when the next step is a file or review pass.

Key takeaways

• Word error rate can look fine while punctuation is unusable.
• Question vs statement errors change meaning.
• This is an NLP post-process, not a microphone setting.

Why it matters

Captions that lack sentence boundaries become reading-speed problems. Transcripts without punctuation fail QA even if every lexical word is right.

Related terms

• automatic speech recognition
• transcript QA
• transcription accuracy
• All glossary terms

Sources

1. OpenAI: Whisper paper (text normalizer discussion)