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fix(ocr): use cw-1/ch-1 for synthetic baseline bounds to pass Kraken's >= check

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Kraken's segmentation bounds check rejects coordinates where any point
satisfies x >= im.width or y >= im.height (strictly >=, not >). Using
(cw, ch) as the boundary corner was triggering this for every crop.
Changed to (cw-1, ch-1) so all coordinates are strictly inside the image.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-04-13 16:21:00 +02:00
parent 051c43f088
commit 3e34366702
1 changed files with 5 additions and 3 deletions
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8
ocr-service/engines/kraken.py
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@@ -104,7 +104,9 @@ def extract_region_text(image, x: float, y: float, w: float, h: float) -> str:
if cw == 0 or ch == 0: if cw == 0 or ch == 0:
return "" return ""
# Single synthetic baseline at vertical midpoint, spanning full crop width # Single synthetic baseline at vertical midpoint, spanning full crop width.
# Kraken's bounds check is >= (not >), so all coordinates must be < image
# dimension — use cw-1 / ch-1 to stay strictly inside.
mid_y = ch // 2 mid_y = ch // 2
synthetic_seg = Segmentation( synthetic_seg = Segmentation(
type="baselines", type="baselines",
@@ -114,8 +116,8 @@ def extract_region_text(image, x: float, y: float, w: float, h: float) -> str:
lines=[ lines=[
BaselineLine( BaselineLine(
id="line0", id="line0",
baseline=[(0, mid_y), (cw, mid_y)], baseline=[(0, mid_y), (cw - 1, mid_y)],
boundary=[(0, 0), (cw, 0), (cw, ch), (0, ch)], boundary=[(0, 0), (cw - 1, 0), (cw - 1, ch - 1), (0, ch - 1)],
) )
], ],
regions={}, regions={},