45287b3541
overflow-hidden → overflow-y-auto so all nav items are reachable. Added /parent (Eltern-Portal) link with people icon. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
442 lines
16 KiB
Python
442 lines
16 KiB
Python
"""
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Language scoring, role scoring, and dictionary detection/classification.
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Extracted from cv_layout.py to keep modules under 500 LOC.
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Lizenz: Apache 2.0 (kommerziell nutzbar)
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DATENSCHUTZ: Alle Verarbeitung erfolgt lokal.
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"""
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import logging
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from collections import Counter
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from typing import Any, Dict, List, Optional
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from cv_vocab_types import (
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ColumnGeometry,
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ENGLISH_FUNCTION_WORDS,
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GERMAN_FUNCTION_WORDS,
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PageRegion,
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)
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logger = logging.getLogger(__name__)
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# --- Dictionary / Wörterbuch Detection ---
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# Article words that appear as a dedicated column in dictionaries
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_DICT_ARTICLE_WORDS = {
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# German articles
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"die", "der", "das", "dem", "den", "des", "ein", "eine", "einem", "einer",
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# English articles / infinitive marker
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"the", "a", "an", "to",
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}
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# --- Phase B: Content-Based Classification ---
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def _score_language(words: List[Dict]) -> Dict[str, float]:
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"""Score the language of a column's words.
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Analyzes function words, umlauts, and capitalization patterns
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to determine whether text is English or German.
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Args:
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words: List of word dicts with 'text' and 'conf' keys.
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Returns:
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Dict with 'eng' and 'deu' scores (0.0-1.0).
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"""
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if not words:
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return {'eng': 0.0, 'deu': 0.0}
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# Only consider words with decent confidence
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good_words = [w['text'].lower() for w in words if w.get('conf', 0) > 40 and len(w['text']) > 0]
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if not good_words:
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return {'eng': 0.0, 'deu': 0.0}
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total = len(good_words)
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en_hits = sum(1 for w in good_words if w in ENGLISH_FUNCTION_WORDS)
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de_hits = sum(1 for w in good_words if w in GERMAN_FUNCTION_WORDS)
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# Check for umlauts (strong German signal)
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raw_texts = [w['text'] for w in words if w.get('conf', 0) > 40]
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umlaut_count = sum(1 for t in raw_texts
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for c in t if c in 'äöüÄÖÜß')
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# German capitalization: nouns are capitalized mid-sentence
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# Count words that start with uppercase but aren't at position 0
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cap_words = sum(1 for t in raw_texts if t[0].isupper() and len(t) > 2)
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en_score = en_hits / total if total > 0 else 0.0
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de_score = de_hits / total if total > 0 else 0.0
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# Boost German score for umlauts
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if umlaut_count > 0:
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de_score = min(1.0, de_score + 0.15 * min(umlaut_count, 5))
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# Boost German score for high capitalization ratio (typical for German nouns)
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if total > 5:
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cap_ratio = cap_words / total
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if cap_ratio > 0.3:
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de_score = min(1.0, de_score + 0.1)
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return {'eng': round(en_score, 3), 'deu': round(de_score, 3)}
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def _score_role(geom: ColumnGeometry) -> Dict[str, float]:
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"""Score the role of a column based on its geometry and content patterns.
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Args:
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geom: ColumnGeometry with words and dimensions.
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Returns:
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Dict with role scores: 'reference', 'marker', 'sentence', 'vocabulary'.
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"""
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scores = {'reference': 0.0, 'marker': 0.0, 'sentence': 0.0, 'vocabulary': 0.0}
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if not geom.words:
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return scores
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texts = [w['text'] for w in geom.words if w.get('conf', 0) > 40]
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if not texts:
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return scores
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avg_word_len = sum(len(t) for t in texts) / len(texts)
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has_punctuation = sum(1 for t in texts if any(c in t for c in '.!?;:,'))
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digit_words = sum(1 for t in texts if any(c.isdigit() for c in t))
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digit_ratio = digit_words / len(texts) if texts else 0.0
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# Reference: narrow + mostly numbers/page references
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if geom.width_ratio < 0.12:
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scores['reference'] = 0.5
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if digit_ratio > 0.4:
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scores['reference'] = min(1.0, 0.5 + digit_ratio * 0.5)
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# Marker: narrow + few short entries
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if geom.width_ratio < 0.06 and geom.word_count <= 15:
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scores['marker'] = 0.7
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if avg_word_len < 4:
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scores['marker'] = 0.9
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# Very narrow non-edge column → strong marker regardless of word count
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if geom.width_ratio < 0.04 and geom.index > 0:
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scores['marker'] = max(scores['marker'], 0.9)
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# Sentence: longer words + punctuation present
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if geom.width_ratio > 0.15 and has_punctuation > 2:
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scores['sentence'] = 0.3 + min(0.5, has_punctuation / len(texts))
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if avg_word_len > 4:
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scores['sentence'] = min(1.0, scores['sentence'] + 0.2)
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# Vocabulary: medium width + medium word length
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if 0.10 < geom.width_ratio < 0.45:
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scores['vocabulary'] = 0.4
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if 3 < avg_word_len < 8:
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scores['vocabulary'] = min(1.0, scores['vocabulary'] + 0.3)
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return {k: round(v, 3) for k, v in scores.items()}
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def _score_dictionary_signals(
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geometries: List[ColumnGeometry],
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document_category: Optional[str] = None,
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margin_strip_detected: bool = False,
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) -> Dict[str, Any]:
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"""Score dictionary-specific patterns across all columns.
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Combines 4 independent signals to determine if the page is a dictionary:
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1. Alphabetical ordering of words in each column
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2. Article column detection (der/die/das, to)
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3. First-letter uniformity (most headwords share a letter)
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4. Decorative A-Z margin strip (detected upstream)
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Args:
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geometries: List of ColumnGeometry with words.
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document_category: User-selected category (e.g. 'woerterbuch').
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margin_strip_detected: Whether a decorative A-Z margin strip was found.
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Returns:
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Dict with 'is_dictionary', 'confidence', 'article_col_index',
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'headword_col_index', and 'signals' sub-dict.
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"""
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result: Dict[str, Any] = {
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"is_dictionary": False,
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"confidence": 0.0,
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"article_col_index": None,
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"headword_col_index": None,
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"signals": {},
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}
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if not geometries or len(geometries) < 2:
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return result
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# --- Signal 1: Alphabetical ordering per column (weight 0.35) ---
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best_alpha_score = 0.0
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best_alpha_col = -1
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for geom in geometries:
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texts = [
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w["text"].strip().lower()
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for w in sorted(geom.words, key=lambda w: w.get("top", 0))
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if w.get("conf", 0) > 30 and len(w["text"].strip()) >= 2
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]
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if len(texts) < 5:
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continue
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# Deduplicate consecutive identical words (OCR double-reads)
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deduped = [texts[0]]
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for t in texts[1:]:
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if t != deduped[-1]:
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deduped.append(t)
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if len(deduped) < 5:
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continue
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# Count consecutive pairs in alphabetical order
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ordered_pairs = sum(
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1 for i in range(len(deduped) - 1)
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if deduped[i] <= deduped[i + 1]
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)
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alpha_score = ordered_pairs / (len(deduped) - 1)
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if alpha_score > best_alpha_score:
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best_alpha_score = alpha_score
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best_alpha_col = geom.index
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result["signals"]["alphabetical_score"] = round(best_alpha_score, 3)
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result["signals"]["alphabetical_col"] = best_alpha_col
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# --- Signal 2: Article detection (weight 0.25) ---
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# Check three patterns:
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# (a) Dedicated narrow article column (der/die/das only)
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# (b) Inline articles: multi-word texts starting with "der X", "die X"
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# (c) High article word frequency: many individual words ARE articles
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# (common when OCR splits "der Zustand" into separate word_boxes)
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best_article_density = 0.0
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best_article_col = -1
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best_inline_article_ratio = 0.0
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best_article_word_ratio = 0.0
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for geom in geometries:
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texts = [
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w["text"].strip().lower()
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for w in geom.words
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if w.get("conf", 0) > 30 and len(w["text"].strip()) > 0
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]
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if len(texts) < 3:
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continue
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# (a) Dedicated article column: narrow, mostly article words
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article_count = sum(1 for t in texts if t in _DICT_ARTICLE_WORDS)
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if geom.width_ratio <= 0.20:
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density = article_count / len(texts)
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if density > best_article_density:
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best_article_density = density
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best_article_col = geom.index
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# (b) Inline articles: "der Zustand", "die Zutat", etc.
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inline_count = sum(
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1 for t in texts
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if any(t.startswith(art + " ") for art in _DICT_ARTICLE_WORDS)
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)
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inline_ratio = inline_count / len(texts)
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if inline_ratio > best_inline_article_ratio:
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best_inline_article_ratio = inline_ratio
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# (c) Article word frequency in any column (for OCR-split word_boxes)
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# In dictionaries, articles appear frequently among headwords
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# Require at least 10% articles and >= 3 article words
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if article_count >= 3:
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art_ratio = article_count / len(texts)
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# Only count if column has enough non-article words too
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# (pure article column is handled by (a))
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non_art = len(texts) - article_count
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if non_art >= 3 and art_ratio > best_article_word_ratio:
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best_article_word_ratio = art_ratio
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# Use the strongest signal
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effective_article_score = max(
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best_article_density,
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best_inline_article_ratio,
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best_article_word_ratio * 0.8, # slight discount for raw word ratio
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)
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result["signals"]["article_density"] = round(best_article_density, 3)
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result["signals"]["inline_article_ratio"] = round(best_inline_article_ratio, 3)
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result["signals"]["article_word_ratio"] = round(best_article_word_ratio, 3)
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result["signals"]["article_col"] = best_article_col
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# --- Signal 3: First-letter uniformity (weight 0.25) ---
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best_uniformity = 0.0
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best_uniform_col = -1
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has_letter_transition = False
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for geom in geometries:
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texts = [
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w["text"].strip().lower()
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for w in sorted(geom.words, key=lambda w: w.get("top", 0))
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if w.get("conf", 0) > 30 and len(w["text"].strip()) >= 2
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]
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if len(texts) < 5:
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continue
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# Count first letters
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first_letters = [t[0] for t in texts if t[0].isalpha()]
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if not first_letters:
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continue
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letter_counts = Counter(first_letters)
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most_common_letter, most_common_count = letter_counts.most_common(1)[0]
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uniformity = most_common_count / len(first_letters)
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# Check for orderly letter transitions (A→B or Y→Z)
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# Group consecutive words by first letter, check if groups are in order
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groups = []
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current_letter = first_letters[0]
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for fl in first_letters:
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if fl != current_letter:
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groups.append(current_letter)
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current_letter = fl
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groups.append(current_letter)
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if len(groups) >= 2 and len(groups) <= 5:
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# Check if groups are alphabetically ordered
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if all(groups[i] <= groups[i + 1] for i in range(len(groups) - 1)):
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has_letter_transition = True
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# Boost uniformity for orderly transitions
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uniformity = max(uniformity, 0.70)
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if uniformity > best_uniformity:
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best_uniformity = uniformity
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best_uniform_col = geom.index
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result["signals"]["first_letter_uniformity"] = round(best_uniformity, 3)
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result["signals"]["uniform_col"] = best_uniform_col
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result["signals"]["has_letter_transition"] = has_letter_transition
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# --- Signal 4: Decorative margin strip (weight 0.15) ---
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result["signals"]["margin_strip_detected"] = margin_strip_detected
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# --- Combine signals ---
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s1 = min(best_alpha_score, 1.0) * 0.35
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s2 = min(effective_article_score, 1.0) * 0.25
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s3 = min(best_uniformity, 1.0) * 0.25
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s4 = (1.0 if margin_strip_detected else 0.0) * 0.15
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combined = s1 + s2 + s3 + s4
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# Boost if user set document_category to 'woerterbuch'
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if document_category == "woerterbuch":
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combined = min(1.0, combined + 0.20)
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result["signals"]["category_boost"] = True
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result["confidence"] = round(combined, 3)
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# Threshold: combined >= 0.40 to classify as dictionary
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# (at least 2 strong signals or 3 moderate ones)
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if combined >= 0.40:
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result["is_dictionary"] = True
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# Identify headword column: best alphabetical OR best uniform
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if best_alpha_col >= 0 and best_alpha_score >= 0.60:
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result["headword_col_index"] = best_alpha_col
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elif best_uniform_col >= 0 and best_uniformity >= 0.50:
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result["headword_col_index"] = best_uniform_col
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if best_article_col >= 0 and best_article_density >= 0.30:
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result["article_col_index"] = best_article_col
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# If inline articles are strong but no dedicated column, note it
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if best_inline_article_ratio >= 0.30 and result["article_col_index"] is None:
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result["signals"]["inline_articles_detected"] = True
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logger.info(
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"DictionaryDetection: combined=%.3f is_dict=%s signals=%s",
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combined, result["is_dictionary"], result["signals"],
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)
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return result
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def _classify_dictionary_columns(
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geometries: List[ColumnGeometry],
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dict_signals: Dict[str, Any],
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lang_scores: List[Dict[str, float]],
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content_h: int,
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) -> Optional[List[PageRegion]]:
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"""Classify columns for a detected dictionary page.
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Assigns column_headword, column_article, column_ipa, and
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column_de/column_en based on dictionary signals and language scores.
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Returns None if classification fails.
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"""
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if not dict_signals.get("is_dictionary"):
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return None
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regions: List[PageRegion] = []
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assigned = set()
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article_idx = dict_signals.get("article_col_index")
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headword_idx = dict_signals.get("headword_col_index")
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# 1. Assign article column if detected
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if article_idx is not None:
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for geom in geometries:
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if geom.index == article_idx:
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regions.append(PageRegion(
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type="column_article",
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x=geom.x, y=geom.y,
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width=geom.width, height=content_h,
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classification_confidence=round(
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dict_signals["signals"].get("article_density", 0.5), 2),
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classification_method="dictionary",
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))
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assigned.add(geom.index)
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break
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# 2. Assign headword column
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if headword_idx is not None and headword_idx not in assigned:
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for geom in geometries:
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if geom.index == headword_idx:
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regions.append(PageRegion(
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type="column_headword",
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x=geom.x, y=geom.y,
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width=geom.width, height=content_h,
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classification_confidence=round(
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dict_signals["confidence"], 2),
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classification_method="dictionary",
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))
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assigned.add(geom.index)
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break
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# 3. Assign remaining columns by language + content
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remaining = [g for g in geometries if g.index not in assigned]
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for geom in remaining:
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ls = lang_scores[geom.index] if geom.index < len(lang_scores) else {"eng": 0, "deu": 0}
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# Check if column contains IPA (brackets like [, /, ˈ)
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ipa_chars = sum(
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1 for w in geom.words
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if any(c in (w.get("text") or "") for c in "[]/ˈˌːɪəɒʊæɑɔ")
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)
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ipa_ratio = ipa_chars / max(len(geom.words), 1)
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if ipa_ratio > 0.25:
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col_type = "column_ipa"
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conf = round(min(1.0, ipa_ratio), 2)
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elif ls["deu"] > ls["eng"] and ls["deu"] > 0.05:
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col_type = "column_de"
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conf = round(ls["deu"], 2)
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elif ls["eng"] > ls["deu"] and ls["eng"] > 0.05:
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col_type = "column_en"
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conf = round(ls["eng"], 2)
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else:
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# Positional fallback: leftmost unassigned = EN, next = DE
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left_unassigned = sorted(
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[g for g in remaining if g.index not in assigned],
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key=lambda g: g.x,
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)
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if geom == left_unassigned[0] if left_unassigned else None:
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col_type = "column_en"
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else:
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col_type = "column_de"
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conf = 0.4
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regions.append(PageRegion(
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type=col_type,
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x=geom.x, y=geom.y,
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width=geom.width, height=content_h,
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classification_confidence=conf,
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classification_method="dictionary",
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))
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assigned.add(geom.index)
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regions.sort(key=lambda r: r.x)
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return regions
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