Merge pull request #268 from VikParuchuri/dev

Bad OCR detection model

Author: VikParuchuri

.github/workflows/tests.yml renamed to .github/workflows/benchmarks.yml

@@ -14,16 +14,10 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: 3.11
-      - name: Install apt dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y tesseract-ocr tesseract-ocr-eng
       - name: Install python dependencies
         run: |
           pip install poetry
           poetry install
-          poetry remove torch
-          poetry run pip install torch --index-url https://download.pytorch.org/whl/cpu
       - name: Run detection benchmark test
         run: |
           poetry run python benchmark/detection.py --max 2

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: Integration test
+
+on: [push]
+
+env:
+  TORCH_DEVICE: "cpu"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+      - name: Install apt dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y tesseract-ocr tesseract-ocr-eng
+      - name: Install python dependencies
+        run: |
+          pip install poetry
+          poetry install
+      - name: Run tests
+        run: poetry run pytest

README.md

@@ -217,6 +217,7 @@ The `results.json` file will contain a json dictionary where the keys are the in
   - `polygon` - the polygon for the text line in (x1, y1), (x2, y2), (x3, y3), (x4, y4) format.  The points are in clockwise order from the top left.
   - `position` - the reading order of the box.
   - `label` - the label for the bbox.  One of `Caption`, `Footnote`, `Formula`, `List-item`, `Page-footer`, `Page-header`, `Picture`, `Figure`, `Section-header`, `Table`, `Form`, `Table-of-contents`, `Handwriting`, `Text`, `Text-inline-math`.
+  - `top_k` - the top-k other potential labels for the box.  A dictionary with labels as keys and confidences as values.
 - `page` - the page number in the file
 - `image_bbox` - the bbox for the image in (x1, y1, x2, y2) format.  (x1, y1) is the top left corner, and (x2, y2) is the bottom right corner.  All line bboxes will be contained within this bbox.
 

detect_layout.py

@@ -1,6 +1,4 @@
 import time
-
-import pypdfium2 # Causes a warning if not the top import
 import argparse
 import copy
 import json

ocr_app.py

@@ -1,4 +1,5 @@
 import io
+import tempfile
 from typing import List
 
 import pypdfium2
@@ -15,6 +16,7 @@
 from surya.model.recognition.processor import load_processor as load_rec_processor
 from surya.model.table_rec.model import load_model as load_table_model
 from surya.model.table_rec.processor import load_processor as load_table_processor
+from surya.model.ocr_error.model import load_model as load_ocr_error_model, load_tokenizer as load_ocr_error_processor
 from surya.postprocessing.heatmap import draw_polys_on_image, draw_bboxes_on_image
 from surya.ocr import run_ocr
 from surya.postprocessing.text import draw_text_on_image
@@ -24,7 +26,9 @@
 from surya.schema import OCRResult, TextDetectionResult, LayoutResult, TableResult
 from surya.settings import settings
 from surya.tables import batch_table_recognition
-from surya.postprocessing.util import rescale_bboxes, rescale_bbox
+from surya.postprocessing.util import rescale_bbox
+from pdftext.extraction import plain_text_output
+from surya.ocr_error import batch_ocr_error_detection
 
 
 @st.cache_resource()
@@ -46,6 +50,39 @@ def load_layout_cached():
 def load_table_cached():
     return load_table_model(), load_table_processor()
 
+@st.cache_resource()
+def load_ocr_error_cached():
+    return load_ocr_error_model(), load_ocr_error_processor()
+
+
+def run_ocr_errors(pdf_file, page_count, sample_len=512, max_samples=10, max_pages=15):
+    with tempfile.NamedTemporaryFile(suffix=".pdf") as f:
+        f.write(pdf_file.getvalue())
+        f.seek(0)
+
+        # Sample the text from the middle of the PDF
+        page_middle = page_count // 2
+        page_range = range(max(page_middle - max_pages, 0), min(page_middle + max_pages, page_count))
+        text = plain_text_output(f.name, page_range=page_range)
+
+    sample_gap = len(text) // max_samples
+    if len(text) == 0 or sample_gap == 0:
+        return "This PDF has no text or very little text", ["no text"]
+
+    if sample_gap < sample_len:
+        sample_gap = sample_len
+
+    # Split the text into samples for the model
+    samples = []
+    for i in range(0, len(text), sample_gap):
+        samples.append(text[i:i + sample_len])
+
+    results = batch_ocr_error_detection(samples, ocr_error_model, ocr_error_processor)
+    label = "This PDF has good text."
+    if results.labels.count("bad") / len(results.labels) > .2:
+        label = "This PDF may have garbled or bad OCR text."
+    return label, results.labels
+
 
 def text_detection(img) -> (Image.Image, TextDetectionResult):
     pred = batch_text_detection([img], det_model, det_processor)[0]
@@ -139,13 +176,16 @@ def get_page_image(pdf_file, page_num, dpi=settings.IMAGE_DPI):
     )
     png = list(renderer)[0]
     png_image = png.convert("RGB")
+    doc.close()
     return png_image
 
 
 @st.cache_data()
-def page_count(pdf_file):
+def page_counter(pdf_file):
     doc = open_pdf(pdf_file)
-    return len(doc)
+    doc_len = len(doc)
+    doc.close()
+    return doc_len
 
 
 st.set_page_config(layout="wide")
@@ -155,6 +195,7 @@ def page_count(pdf_file):
 rec_model, rec_processor = load_rec_cached()
 layout_model, layout_processor = load_layout_cached()
 table_model, table_processor = load_table_cached()
+ocr_error_model, ocr_error_processor = load_ocr_error_cached()
 
 
 st.markdown("""
@@ -179,8 +220,9 @@ def page_count(pdf_file):
 
 filetype = in_file.type
 whole_image = False
+page_count = None
 if "pdf" in filetype:
-    page_count = page_count(in_file)
+    page_count = page_counter(in_file)
     page_number = st.sidebar.number_input(f"Page number out of {page_count}:", min_value=1, value=1, max_value=page_count)
 
     pil_image = get_page_image(in_file, page_number, settings.IMAGE_DPI)
@@ -194,6 +236,7 @@ def page_count(pdf_file):
 text_rec = st.sidebar.button("Run OCR")
 layout_det = st.sidebar.button("Run Layout Analysis")
 table_rec = st.sidebar.button("Run Table Rec")
+ocr_errors = st.sidebar.button("Run bad PDF text detection")
 use_pdf_boxes = st.sidebar.checkbox("PDF table boxes", value=True, help="Table recognition only: Use the bounding boxes from the PDF file vs text detection model.")
 skip_table_detection = st.sidebar.checkbox("Skip table detection", value=False, help="Table recognition only: Skip table detection and treat the whole image/page as a table.")
 
@@ -233,5 +276,13 @@ def page_count(pdf_file):
         st.image(table_img, caption="Table Recognition", use_container_width=True)
         st.json([p.model_dump() for p in pred], expanded=True)
 
+if ocr_errors:
+    if "pdf" not in filetype:
+        st.error("This feature only works with PDFs.")
+    label, results = run_ocr_errors(in_file, page_count)
+    with col1:
+        st.write(label)
+        st.json(results)
+
 with col2:
     st.image(pil_image, caption="Uploaded Image", use_container_width=True)