feat: 优化文字框匹配算法，调整搜索范围以提高匹配准确性

merge_mineru_paddle_ocr.py

@@ -200,15 +200,15 @@ class MinerUPaddleOCRMerger:
             (匹配的文字框信息, 新的指针位置)
         """
         target_text = self._normalize_text(target_text)
-        
-        # 在窗口范围内查找
+
+        # 在窗口范围内查找, 窗口是start_index往回移动窗口的1/3到start_index + look_ahead_window
+        search_start = max(0, int(start_index - self.look_ahead_window/3))
         search_end = min(start_index + self.look_ahead_window, len(text_boxes))
         
         best_match = None
         best_index = start_index
-        best_similarity = 0
         
-        for i in range(start_index, search_end):
+        for i in range(search_start, search_end):
             if text_boxes[i]['used']:
                 continue