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WebsiteThorHeimdallWeb Extension

Image & Video OCR

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Image & Video Text Recognition (OCR)

Heimdall uses OCR to extract text from media sent in chat. This prevents scammers from bypassing text-based filters by putting their spam inside images or videos.

  • Image processing: Images are converted to grayscale with automatic level and contrast enhancement for maximum OCR accuracy

  • Video processing: Heimdall extracts the middle frame of a video (for best content representation) and runs OCR on it

  • Fallback logic: If no text is found in the initial scan, additional frames are extracted and scanned

  • Spam checking: All extracted text is combined with the message text and checked against the full spam detection ruleset

Supported formats: JPG, PNG, WebP, GIF, BMP, MP4, AVI, MKV, WebM, MOV, WMV, FLV, and more.

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