The bitmap already knows more than the text.

Inspect forced flags, placement, crop geometry and palette before OCR flattens everything into plain SRT.

01 read flags 02 map geometry 03 prepare restoration

Frame 0142 / PGS Signal acquired

positioned sign

This line has a position.

1720, 872 object x/y 6 colors palette false forced

01 / SUP source

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Grouping

Separate evidence, not presumed intent.

Native forced objects take priority. Remaining PGS cues are grouped only by lower-screen or elevated placement until OCR review can establish meaning.

Restoration

Keep the evidence OCR normally drops.

Coordinates, crop bounds and palette survive the scan so a future ASS pass can use measured values.

Memory

Give corrections a reusable signature.

This MVP fingerprints preview bitmaps. Glyph segmentation and correction-backed learning remain deliberately inactive.