refactor: enhance OCR processing and paragraph splitting in document analysis pipeline

mineru/backend/pipeline/model_json_to_middle_json.py

 # Copyright (c) Opendatalab. All rights reserved.
+from mineru.backend.pipeline.config_reader import get_device
+from mineru.backend.pipeline.model_init import AtomModelSingleton
+from mineru.backend.pipeline.para_split import para_split
 from mineru.utils.block_pre_proc import prepare_block_bboxes, process_groups
 from mineru.utils.block_sort import sort_blocks_by_bbox
 from mineru.utils.cut_image import cut_image_and_table
+from mineru.utils.model_utils import clean_memory
 from mineru.utils.pipeline_magic_model import MagicModel
 from mineru.utils.span_block_fix import fill_spans_in_blocks, fix_discarded_block, fix_block_spans
 from mineru.utils.span_pre_proc import remove_outside_spans, remove_overlaps_low_confidence_spans, \
@@ -124,6 +128,49 @@ def result_to_middle_json(model_list, images_list, pdf_doc, image_writer, lang=N
             page_w, page_h = map(int, page.get_size())
             page_info = make_page_info_dict([], page_index, page_w, page_h, [])
         middle_json["pdf_info"].append(page_info)
+
+    """后置ocr处理"""
+    need_ocr_list = []
+    img_crop_list = []
+    text_block_list = []
+    for page_info in middle_json["pdf_info"]:
+        for block in page_info['preproc_blocks']:
+            if block['type'] in ['table', 'image']:
+                for sub_block in block['blocks']:
+                    if sub_block['type'] in ['image_caption', 'image_footnote', 'table_caption', 'table_footnote']:
+                        text_block_list.append(sub_block)
+            elif block['type'] in ['text', 'title']:
+                text_block_list.append(block)
+        for block in page_info['discarded_blocks']:
+            text_block_list.append(block)
+    for block in text_block_list:
+        for line in block['lines']:
+            for span in line['spans']:
+                if 'np_img' in span:
+                    need_ocr_list.append(span)
+                    img_crop_list.append(span['np_img'])
+                    span.pop('np_img')
+    if len(img_crop_list) > 0:
+        atom_model_manager = AtomModelSingleton()
+        ocr_model = atom_model_manager.get_atom_model(
+            atom_model_name='ocr',
+            ocr_show_log=False,
+            det_db_box_thresh=0.3,
+            lang=lang
+        )
+        ocr_res_list = ocr_model.ocr(img_crop_list, det=False, tqdm_enable=True)[0]
+        assert len(ocr_res_list) == len(
+            need_ocr_list), f'ocr_res_list: {len(ocr_res_list)}, need_ocr_list: {len(need_ocr_list)}'
+        for index, span in enumerate(need_ocr_list):
+            ocr_text, ocr_score = ocr_res_list[index]
+            span['content'] = ocr_text
+            span['score'] = float(f"{ocr_score:.3f}")
+
+    """分段"""
+    para_split(middle_json["pdf_info"])
+
+    clean_memory(get_device())
+
     return middle_json
 
 

mineru/backend/pipeline/para_split.py

+import copy
+from loguru import logger
+from mineru.utils.enum_class import ContentType, BlockType
+from mineru.utils.language import detect_lang
+
+CROSS_PAGE = 'cross_page'
+LINES_DELETED = 'lines_deleted'
+
+LINE_STOP_FLAG = ('.', '!', '?', '。', '！', '？', ')', '）', '"', '”', ':', '：', ';', '；')
+LIST_END_FLAG = ('.', '。', ';', '；')
+
+
+class ListLineTag:
+    IS_LIST_START_LINE = 'is_list_start_line'
+    IS_LIST_END_LINE = 'is_list_end_line'
+
+
+def __process_blocks(blocks):
+    # 对所有block预处理
+    # 1.通过title和interline_equation将block分组
+    # 2.bbox边界根据line信息重置
+
+    result = []
+    current_group = []
+
+    for i in range(len(blocks)):
+        current_block = blocks[i]
+
+        # 如果当前块是 text 类型
+        if current_block['type'] == 'text':
+            current_block['bbox_fs'] = copy.deepcopy(current_block['bbox'])
+            if 'lines' in current_block and len(current_block['lines']) > 0:
+                current_block['bbox_fs'] = [
+                    min([line['bbox'][0] for line in current_block['lines']]),
+                    min([line['bbox'][1] for line in current_block['lines']]),
+                    max([line['bbox'][2] for line in current_block['lines']]),
+                    max([line['bbox'][3] for line in current_block['lines']]),
+                ]
+            current_group.append(current_block)
+
+        # 检查下一个块是否存在
+        if i + 1 < len(blocks):
+            next_block = blocks[i + 1]
+            # 如果下一个块不是 text 类型且是 title 或 interline_equation 类型
+            if next_block['type'] in ['title', 'interline_equation']:
+                result.append(current_group)
+                current_group = []
+
+    # 处理最后一个 group
+    if current_group:
+        result.append(current_group)
+
+    return result
+
+
+def __is_list_or_index_block(block):
+    # 一个block如果是list block 应该同时满足以下特征
+    # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.block内有多个line 右侧不顶格（狗牙状）
+    # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.多个line以endflag结尾
+    # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.block内有多个line 左侧不顶格
+
+    # index block 是一种特殊的list block
+    # 一个block如果是index block 应该同时满足以下特征
+    # 1.block内有多个line 2.block 内有多个line两侧均顶格写 3.line的开头或者结尾均为数字
+    if len(block['lines']) >= 2:
+        first_line = block['lines'][0]
+        line_height = first_line['bbox'][3] - first_line['bbox'][1]
+        block_weight = block['bbox_fs'][2] - block['bbox_fs'][0]
+        block_height = block['bbox_fs'][3] - block['bbox_fs'][1]
+        page_weight, page_height = block['page_size']
+
+        left_close_num = 0
+        left_not_close_num = 0
+        right_not_close_num = 0
+        right_close_num = 0
+        lines_text_list = []
+        center_close_num = 0
+        external_sides_not_close_num = 0
+        multiple_para_flag = False
+        last_line = block['lines'][-1]
+
+        if page_weight == 0:
+            block_weight_radio = 0
+        else:
+            block_weight_radio = block_weight / page_weight
+        # logger.info(f"block_weight_radio: {block_weight_radio}")
+
+        # 如果首行左边不顶格而右边顶格,末行左边顶格而右边不顶格 （第一行可能可以右边不顶格）
+        if (
+            first_line['bbox'][0] - block['bbox_fs'][0] > line_height / 2
+            and abs(last_line['bbox'][0] - block['bbox_fs'][0]) < line_height / 2
+            and block['bbox_fs'][2] - last_line['bbox'][2] > line_height
+        ):
+            multiple_para_flag = True
+
+        block_text = ''
+
+        for line in block['lines']:
+            line_text = ''
+
+            for span in line['spans']:
+                span_type = span['type']
+                if span_type == ContentType.TEXT:
+                    line_text += span['content'].strip()
+            # 添加所有文本，包括空行，保持与block['lines']长度一致
+            lines_text_list.append(line_text)
+            block_text = ''.join(lines_text_list)
+
+        block_lang = detect_lang(block_text)
+        # logger.info(f"block_lang: {block_lang}")
+
+        for line in block['lines']:
+            line_mid_x = (line['bbox'][0] + line['bbox'][2]) / 2
+            block_mid_x = (block['bbox_fs'][0] + block['bbox_fs'][2]) / 2
+            if (
+                line['bbox'][0] - block['bbox_fs'][0] > 0.7 * line_height
+                and block['bbox_fs'][2] - line['bbox'][2] > 0.7 * line_height
+            ):
+                external_sides_not_close_num += 1
+            if abs(line_mid_x - block_mid_x) < line_height / 2:
+                center_close_num += 1
+
+            # 计算line左侧顶格数量是否大于2，是否顶格用abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height/2 来判断
+            if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2:
+                left_close_num += 1
+            elif line['bbox'][0] - block['bbox_fs'][0] > line_height:
+                left_not_close_num += 1
+
+            # 计算右侧是否顶格
+            if abs(block['bbox_fs'][2] - line['bbox'][2]) < line_height:
+                right_close_num += 1
+            else:
+                # 类中文没有超长单词的情况，可以用统一的阈值
+                if block_lang in ['zh', 'ja', 'ko']:
+                    closed_area = 0.26 * block_weight
+                else:
+                    # 右侧不顶格情况下是否有一段距离，拍脑袋用0.3block宽度做阈值
+                    # block宽的阈值可以小些，block窄的阈值要大
+                    if block_weight_radio >= 0.5:
+                        closed_area = 0.26 * block_weight
+                    else:
+                        closed_area = 0.36 * block_weight
+                if block['bbox_fs'][2] - line['bbox'][2] > closed_area:
+                    right_not_close_num += 1
+
+        # 判断lines_text_list中的元素是否有超过80%都以LIST_END_FLAG结尾
+        line_end_flag = False
+        # 判断lines_text_list中的元素是否有超过80%都以数字开头或都以数字结尾
+        line_num_flag = False
+        num_start_count = 0
+        num_end_count = 0
+        flag_end_count = 0
+
+        if len(lines_text_list) > 0:
+            for line_text in lines_text_list:
+                if len(line_text) > 0:
+                    if line_text[-1] in LIST_END_FLAG:
+                        flag_end_count += 1
+                    if line_text[0].isdigit():
+                        num_start_count += 1
+                    if line_text[-1].isdigit():
+                        num_end_count += 1
+
+            if (
+                num_start_count / len(lines_text_list) >= 0.8
+                or num_end_count / len(lines_text_list) >= 0.8
+            ):
+                line_num_flag = True
+            if flag_end_count / len(lines_text_list) >= 0.8:
+                line_end_flag = True
+
+        # 有的目录右侧不贴边, 目前认为左边或者右边有一边全贴边，且符合数字规则极为index
+        if (
+            left_close_num / len(block['lines']) >= 0.8
+            or right_close_num / len(block['lines']) >= 0.8
+        ) and line_num_flag:
+            for line in block['lines']:
+                line[ListLineTag.IS_LIST_START_LINE] = True
+            return BlockType.INDEX
+
+        # 全部line都居中的特殊list识别，每行都需要换行，特征是多行，且大多数行都前后not_close,每line中点x坐标接近
+        # 补充条件block的长宽比有要求
+        elif (
+            external_sides_not_close_num >= 2
+            and center_close_num == len(block['lines'])
+            and external_sides_not_close_num / len(block['lines']) >= 0.5
+            and block_height / block_weight > 0.4
+        ):
+            for line in block['lines']:
+                line[ListLineTag.IS_LIST_START_LINE] = True
+            return BlockType.LIST
+
+        elif (
+            left_close_num >= 2
+            and (right_not_close_num >= 2 or line_end_flag or left_not_close_num >= 2)
+            and not multiple_para_flag
+            # and block_weight_radio > 0.27
+        ):
+            # 处理一种特殊的没有缩进的list，所有行都贴左边，通过右边的空隙判断是否是item尾
+            if left_close_num / len(block['lines']) > 0.8:
+                # 这种是每个item只有一行，且左边都贴边的短item list
+                if flag_end_count == 0 and right_close_num / len(block['lines']) < 0.5:
+                    for line in block['lines']:
+                        if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2:
+                            line[ListLineTag.IS_LIST_START_LINE] = True
+                # 这种是大部分line item 都有结束标识符的情况，按结束标识符区分不同item
+                elif line_end_flag:
+                    for i, line in enumerate(block['lines']):
+                        if (
+                            len(lines_text_list[i]) > 0
+                            and lines_text_list[i][-1] in LIST_END_FLAG
+                        ):
+                            line[ListLineTag.IS_LIST_END_LINE] = True
+                            if i + 1 < len(block['lines']):
+                                block['lines'][i + 1][
+                                    ListLineTag.IS_LIST_START_LINE
+                                ] = True
+                # line item基本没有结束标识符，而且也没有缩进，按右侧空隙判断哪些是item end
+                else:
+                    line_start_flag = False
+                    for i, line in enumerate(block['lines']):
+                        if line_start_flag:
+                            line[ListLineTag.IS_LIST_START_LINE] = True
+                            line_start_flag = False
+
+                        if (
+                            abs(block['bbox_fs'][2] - line['bbox'][2])
+                            > 0.1 * block_weight
+                        ):
+                            line[ListLineTag.IS_LIST_END_LINE] = True
+                            line_start_flag = True
+            # 一种有缩进的特殊有序list,start line 左侧不贴边且以数字开头，end line 以 IS_LIST_END_FLAG 结尾且数量和start line 一致
+            elif num_start_count >= 2 and num_start_count == flag_end_count:
+                for i, line in enumerate(block['lines']):
+                    if len(lines_text_list[i]) > 0:
+                        if lines_text_list[i][0].isdigit():
+                            line[ListLineTag.IS_LIST_START_LINE] = True
+                        if lines_text_list[i][-1] in LIST_END_FLAG:
+                            line[ListLineTag.IS_LIST_END_LINE] = True
+            else:
+                # 正常有缩进的list处理
+                for line in block['lines']:
+                    if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2:
+                        line[ListLineTag.IS_LIST_START_LINE] = True
+                    if abs(block['bbox_fs'][2] - line['bbox'][2]) > line_height:
+                        line[ListLineTag.IS_LIST_END_LINE] = True
+
+            return BlockType.LIST
+        else:
+            return BlockType.TEXT
+    else:
+        return BlockType.TEXT
+
+
+def __merge_2_text_blocks(block1, block2):
+    if len(block1['lines']) > 0:
+        first_line = block1['lines'][0]
+        line_height = first_line['bbox'][3] - first_line['bbox'][1]
+        block1_weight = block1['bbox'][2] - block1['bbox'][0]
+        block2_weight = block2['bbox'][2] - block2['bbox'][0]
+        min_block_weight = min(block1_weight, block2_weight)
+        if abs(block1['bbox_fs'][0] - first_line['bbox'][0]) < line_height / 2:
+            last_line = block2['lines'][-1]
+            if len(last_line['spans']) > 0:
+                last_span = last_line['spans'][-1]
+                line_height = last_line['bbox'][3] - last_line['bbox'][1]
+                if len(first_line['spans']) > 0:
+                    first_span = first_line['spans'][0]
+                    if len(first_span['content']) > 0:
+                        span_start_with_num = first_span['content'][0].isdigit()
+                        span_start_with_big_char = first_span['content'][0].isupper()
+                        if (
+                            # 上一个block的最后一个line的右边界和block的右边界差距不超过line_height
+                            abs(block2['bbox_fs'][2] - last_line['bbox'][2]) < line_height
+                            # 上一个block的最后一个span不是以特定符号结尾
+                            and not last_span['content'].endswith(LINE_STOP_FLAG)
+                            # 两个block宽度差距超过2倍也不合并
+                            and abs(block1_weight - block2_weight) < min_block_weight
+                            # 下一个block的第一个字符是数字
+                            and not span_start_with_num
+                            # 下一个block的第一个字符是大写字母
+                            and not span_start_with_big_char
+                        ):
+                            if block1['page_num'] != block2['page_num']:
+                                for line in block1['lines']:
+                                    for span in line['spans']:
+                                        span[CROSS_PAGE] = True
+                            block2['lines'].extend(block1['lines'])
+                            block1['lines'] = []
+                            block1[LINES_DELETED] = True
+
+    return block1, block2
+
+
+def __merge_2_list_blocks(block1, block2):
+    if block1['page_num'] != block2['page_num']:
+        for line in block1['lines']:
+            for span in line['spans']:
+                span[CROSS_PAGE] = True
+    block2['lines'].extend(block1['lines'])
+    block1['lines'] = []
+    block1[LINES_DELETED] = True
+
+    return block1, block2
+
+
+def __is_list_group(text_blocks_group):
+    # list group的特征是一个group内的所有block都满足以下条件
+    # 1.每个block都不超过3行 2. 每个block 的左边界都比较接近(逻辑简单点先不加这个规则)
+    for block in text_blocks_group:
+        if len(block['lines']) > 3:
+            return False
+    return True
+
+
+def __para_merge_page(blocks):
+    page_text_blocks_groups = __process_blocks(blocks)
+    for text_blocks_group in page_text_blocks_groups:
+        if len(text_blocks_group) > 0:
+            # 需要先在合并前对所有block判断是否为list or index block
+            for block in text_blocks_group:
+                block_type = __is_list_or_index_block(block)
+                block['type'] = block_type
+                # logger.info(f"{block['type']}:{block}")
+
+        if len(text_blocks_group) > 1:
+            # 在合并前判断这个group 是否是一个 list group
+            is_list_group = __is_list_group(text_blocks_group)
+
+            # 倒序遍历
+            for i in range(len(text_blocks_group) - 1, -1, -1):
+                current_block = text_blocks_group[i]
+
+                # 检查是否有前一个块
+                if i - 1 >= 0:
+                    prev_block = text_blocks_group[i - 1]
+
+                    if (
+                        current_block['type'] == 'text'
+                        and prev_block['type'] == 'text'
+                        and not is_list_group
+                    ):
+                        __merge_2_text_blocks(current_block, prev_block)
+                    elif (
+                        current_block['type'] == BlockType.LIST
+                        and prev_block['type'] == BlockType.LIST
+                    ) or (
+                        current_block['type'] == BlockType.INDEX
+                        and prev_block['type'] == BlockType.INDEX
+                    ):
+                        __merge_2_list_blocks(current_block, prev_block)
+
+        else:
+            continue
+
+
+def para_split(page_info_list):
+    all_blocks = []
+    for page_info in page_info_list:
+        blocks = copy.deepcopy(page_info['preproc_blocks'])
+        for block in blocks:
+            block['page_num'] = page_info['page_idx']
+            block['page_size'] = page_info['page_size']
+        all_blocks.extend(blocks)
+
+    __para_merge_page(all_blocks)
+    for page_info in page_info_list:
+        page_info['para_blocks'] = []
+        for block in all_blocks:
+            if block['page_num'] == page_info['page_idx']:
+                page_info['para_blocks'].append(block)
+
+
+if __name__ == '__main__':
+    input_blocks = []
+    # 调用函数
+    groups = __process_blocks(input_blocks)
+    for group_index, group in enumerate(groups):
+        print(f'Group {group_index}: {group}')

mineru/backend/pipeline/pipeline_analyze.py

@@ -138,13 +138,17 @@ def doc_analyze(
     # 构建返回结果
     infer_results = []
 
+    for _ in range(len(pdf_bytes_list)):
+        infer_results.append([])
+
     for i, page_info in enumerate(all_pages_info):
         pdf_idx, page_idx, pil_img, _, _ = page_info
         result = results[i]
 
         page_info_dict = {'page_no': page_idx, 'width': pil_img.width, 'height': pil_img.height}
         page_dict = {'layout_dets': result, 'page_info': page_info_dict}
-        infer_results[pdf_idx][page_idx] = page_dict
+
+        infer_results[pdf_idx].append(page_dict)
 
     return infer_results, all_image_lists, all_pdf_docs, lang_list, ocr_enabled_list