from magic_pdf.config.ocr_content_type import BlockType from magic_pdf.libs.boxbase import ( calculate_iou, calculate_overlap_area_in_bbox1_area_ratio, calculate_vertical_projection_overlap_ratio, get_minbox_if_overlap_by_ratio ) from magic_pdf.pre_proc.remove_bbox_overlap import remove_overlap_between_bbox_for_block def add_bboxes(blocks, block_type, bboxes): for block in blocks: x0, y0, x1, y1 = block['bbox'] if block_type in [ BlockType.ImageBody, BlockType.ImageCaption, BlockType.ImageFootnote, BlockType.TableBody, BlockType.TableCaption, BlockType.TableFootnote, ]: bboxes.append( [ x0, y0, x1, y1, None, None, None, block_type, None, None, None, None, block['score'], block['group_id'], ] ) else: bboxes.append( [ x0, y0, x1, y1, None, None, None, block_type, None, None, None, None, block['score'], ] ) def ocr_prepare_bboxes_for_layout_split_v2( img_body_blocks, img_caption_blocks, img_footnote_blocks, table_body_blocks, table_caption_blocks, table_footnote_blocks, discarded_blocks, text_blocks, title_blocks, interline_equation_blocks, page_w, page_h, ): all_bboxes = [] add_bboxes(img_body_blocks, BlockType.ImageBody, all_bboxes) add_bboxes(img_caption_blocks, BlockType.ImageCaption, all_bboxes) add_bboxes(img_footnote_blocks, BlockType.ImageFootnote, all_bboxes) add_bboxes(table_body_blocks, BlockType.TableBody, all_bboxes) add_bboxes(table_caption_blocks, BlockType.TableCaption, all_bboxes) add_bboxes(table_footnote_blocks, BlockType.TableFootnote, all_bboxes) add_bboxes(text_blocks, BlockType.Text, all_bboxes) add_bboxes(title_blocks, BlockType.Title, all_bboxes) add_bboxes(interline_equation_blocks, BlockType.InterlineEquation, all_bboxes) """block嵌套问题解决""" """文本框与标题框重叠，优先信任文本框""" all_bboxes = fix_text_overlap_title_blocks(all_bboxes) """任何框体与舍弃框重叠，优先信任舍弃框""" all_bboxes = remove_need_drop_blocks(all_bboxes, discarded_blocks) # interline_equation 与title或text框冲突的情况，分两种情况处理 """interline_equation框与文本类型框iou比较接近1的时候，信任行间公式框""" all_bboxes = fix_interline_equation_overlap_text_blocks_with_hi_iou(all_bboxes) """interline_equation框被包含在文本类型框内，且interline_equation比文本区块小很多时信任文本框，这时需要舍弃公式框""" # 通过后续大框套小框逻辑删除 """discarded_blocks""" all_discarded_blocks = [] add_bboxes(discarded_blocks, BlockType.Discarded, all_discarded_blocks) """footnote识别：宽度超过1/3页面宽度的，高度超过10的，处于页面下半30%区域的""" footnote_blocks = [] for discarded in discarded_blocks: x0, y0, x1, y1 = discarded['bbox'] if (x1 - x0) > (page_w / 3) and (y1 - y0) > 10 and y0 > (page_h * 0.7): footnote_blocks.append([x0, y0, x1, y1]) """移除在footnote下面的任何框""" need_remove_blocks = find_blocks_under_footnote(all_bboxes, footnote_blocks) if len(need_remove_blocks) > 0: for block in need_remove_blocks: all_bboxes.remove(block) all_discarded_blocks.append(block) """经过以上处理后，还存在大框套小框的情况，则删除小框""" all_bboxes = remove_overlaps_min_blocks(all_bboxes) all_discarded_blocks = remove_overlaps_min_blocks(all_discarded_blocks) """将剩余的bbox做分离处理，防止后面分layout时出错""" # all_bboxes, drop_reasons = remove_overlap_between_bbox_for_block(all_bboxes) all_bboxes.sort(key=lambda x: x[0]+x[1]) return all_bboxes, all_discarded_blocks, footnote_blocks def find_blocks_under_footnote(all_bboxes, footnote_blocks): need_remove_blocks = [] for block in all_bboxes: block_x0, block_y0, block_x1, block_y1 = block[:4] for footnote_bbox in footnote_blocks: footnote_x0, footnote_y0, footnote_x1, footnote_y1 = footnote_bbox # 如果footnote的纵向投影覆盖了block的纵向投影的80%且block的y0大于等于footnote的y1 if ( block_y0 >= footnote_y1 and calculate_vertical_projection_overlap_ratio( (block_x0, block_y0, block_x1, block_y1), footnote_bbox ) >= 0.8 ): if block not in need_remove_blocks: need_remove_blocks.append(block) break return need_remove_blocks def fix_interline_equation_overlap_text_blocks_with_hi_iou(all_bboxes): # 先提取所有text和interline block text_blocks = [] for block in all_bboxes: if block[7] == BlockType.Text: text_blocks.append(block) interline_equation_blocks = [] for block in all_bboxes: if block[7] == BlockType.InterlineEquation: interline_equation_blocks.append(block) need_remove = [] for interline_equation_block in interline_equation_blocks: for text_block in text_blocks: interline_equation_block_bbox = interline_equation_block[:4] text_block_bbox = text_block[:4] if calculate_iou(interline_equation_block_bbox, text_block_bbox) > 0.8: if text_block not in need_remove: need_remove.append(text_block) if len(need_remove) > 0: for block in need_remove: all_bboxes.remove(block) return all_bboxes def fix_text_overlap_title_blocks(all_bboxes): # 先提取所有text和title block text_blocks = [] for block in all_bboxes: if block[7] == BlockType.Text: text_blocks.append(block) title_blocks = [] for block in all_bboxes: if block[7] == BlockType.Title: title_blocks.append(block) need_remove = [] for text_block in text_blocks: for title_block in title_blocks: text_block_bbox = text_block[:4] title_block_bbox = title_block[:4] if calculate_iou(text_block_bbox, title_block_bbox) > 0.8: if title_block not in need_remove: need_remove.append(title_block) if len(need_remove) > 0: for block in need_remove: all_bboxes.remove(block) return all_bboxes def remove_need_drop_blocks(all_bboxes, discarded_blocks): need_remove = [] for block in all_bboxes: for discarded_block in discarded_blocks: block_bbox = block[:4] if ( calculate_overlap_area_in_bbox1_area_ratio( block_bbox, discarded_block['bbox'] ) > 0.6 ): if block not in need_remove: need_remove.append(block) break if len(need_remove) > 0: for block in need_remove: all_bboxes.remove(block) return all_bboxes def remove_overlaps_min_blocks(all_bboxes): # 重叠block，小的不能直接删除，需要和大的那个合并成一个更大的。 # 删除重叠blocks中较小的那些 need_remove = [] for block1 in all_bboxes: for block2 in all_bboxes: if block1 != block2: block1_bbox = block1[:4] block2_bbox = block2[:4] overlap_box = get_minbox_if_overlap_by_ratio( block1_bbox, block2_bbox, 0.8 ) if overlap_box is not None: block_to_remove = next( (block for block in all_bboxes if block[:4] == overlap_box), None, ) if ( block_to_remove is not None and block_to_remove not in need_remove ): large_block = block1 if block1 != block_to_remove else block2 x1, y1, x2, y2 = large_block[:4] sx1, sy1, sx2, sy2 = block_to_remove[:4] x1 = min(x1, sx1) y1 = min(y1, sy1) x2 = max(x2, sx2) y2 = max(y2, sy2) large_block[:4] = [x1, y1, x2, y2] need_remove.append(block_to_remove) if len(need_remove) > 0: for block in need_remove: all_bboxes.remove(block) return all_bboxes