dvcrn Layout Analyzer Skill
Overview
This skill enables document layout analysis using surya - an advanced document understanding system. Detect text blocks, tables, figures, headings, and determine reading order in complex documents.
How to Use
- Provide the document image or PDF
- Specify what layout elements to detect
- I'll analyze the structure and return detected regions
Example prompts:
- "Analyze the layout of this document page"
- "Detect all tables and text blocks in this image"
- "Determine the reading order for this PDF page"
- "Find headings and paragraphs in this document"
Domain Knowledge
surya Fundamentals
from surya.detection import DetectionPredictor
from surya.layout import LayoutPredictor
from surya.reading_order import ReadingOrderPredictor
from PIL import Image
# Load image
image = Image.open("document.png")
# Detect layout elements
layout_predictor = LayoutPredictor()
layout_result = layout_predictor([image])
Layout Element Types
| Element | Description |
|---|---|
| Text | Regular paragraph text |
| Title | Document/section titles |
| Section-header | Section headings |
| List-item | Bulleted/numbered items |
| Table | Tabular data |
| Figure | Images/diagrams |
| Caption | Figure/table captions |
| Footnote | Footnotes |
| Formula | Mathematical equations |
| Page-header | Headers |
| Page-footer | Footers |
Text Detection
from surya.detection import DetectionPredictor
from PIL import Image
# Initialize detector
detector = DetectionPredictor()
# Load image
image = Image.open("document.png")
# Detect text regions
results = detector([image])
# Access results
for page_result in results:
for bbox in page_result.bboxes:
print(f"Text region: {bbox.bbox}")
print(f"Confidence: {bbox.confidence}")
Layout Analysis
from surya.layout import LayoutPredictor
from PIL import Image
# Initialize layout predictor
layout_predictor = LayoutPredictor()
# Analyze layout
image = Image.open("document.png")
layout_results = layout_predictor([image])
# Process results
for page_result in layout_results:
for element in page_result.bboxes:
print(f"Type: {element.label}")
print(f"Bbox: {element.bbox}")
print(f"Confidence: {element.confidence}")
Reading Order Detection
from surya.reading_order import ReadingOrderPredictor
from surya.layout import LayoutPredictor
from PIL import Image
# Get layout first
layout_predictor = LayoutPredictor()
image = Image.open("document.png")
layout_results = layout_predictor([image])
# Determine reading order
reading_order_predictor = ReadingOrderPredictor()
order_results = reading_order_predictor([image], layout_results)
# Access ordered elements
for page_result in order_results:
for i, element in enumerate(page_result.ordered_bboxes):
print(f"{i+1}. {element.label}: {element.bbox}")
OCR with Layout
from surya.ocr import OCRPredictor
from surya.layout import LayoutPredictor
from PIL import Image
# Initialize predictors
ocr_predictor = OCRPredictor()
layout_predictor = LayoutPredictor()
# Load image
image = Image.open("document.png")
# Get layout
layout_results = layout_predictor([image])
# Run OCR
ocr_results = ocr_predictor([image])
# Combine results
for layout, ocr in zip(layout_results, ocr_results):
for layout_elem in layout.bboxes:
print(f"Element: {layout_elem.label}")
# Find OCR text within this layout element
for text_line in ocr.text_lines:
if boxes_overlap(layout_elem.bbox, text_line.bbox):
print(f" Text: {text_line.text}")
Processing PDFs
from surya.layout import LayoutPredictor
from pdf2image import convert_from_path
def analyze_pdf_layout(pdf_path):
"""Analyze layout of all pages in PDF."""
# Convert PDF to images
images = convert_from_path(pdf_path)
# Initialize predictor
layout_predictor = LayoutPredictor()
# Analyze all pages
results = layout_predictor(images)
document_structure = []
for page_num, page_result in enumerate(results):
page_elements = []
for element in page_result.bboxes:
page_elements.append({
'type': element.label,
'bbox': element.bbox,
'confidence': element.confidence
})
document_structure.append({
'page': page_num + 1,
'elements': page_elements
})
return document_structure
structure = analyze_pdf_layout("document.pdf")
Visualization
from surya.layout import LayoutPredictor
from PIL import Image, ImageDraw, ImageFont
def visualize_layout(image_path, output_path):
"""Visualize detected layout elements."""
image = Image.open(image_path)
layout_predictor = LayoutPredictor()
results = layout_predictor([image])
# Create drawing context
draw = ImageDraw.Draw(image)
# Color mapping for element types
colors = {
'Text': 'blue',
'Title': 'red',
'Table': 'green',
'Figure': 'purple',
'Section-header': 'orange',
'List-item': 'cyan',
}
for element in results[0].bboxes:
bbox = element.bbox
color = colors.get(element.label, 'gray')
# Draw rectangle
draw.rectangle(bbox, outline=color, width=2)
# Add label
draw.text((bbox[0], bbox[1] - 15),
f"{element.label} ({element.confidence:.2f})",
fill=color)
image.save(output_path)
return output_path
Best Practices
- Use High-Quality Images: 150+ DPI for best results
- Preprocess if Needed: Deskew rotated documents
- Validate Results: Check confidence scores
- Handle Multi-page: Process pages individually
- Combine with OCR: Get text within detected regions
Common Patterns
Document Structure Extraction
def extract_document_structure(image_path):
"""Extract hierarchical document structure."""
from surya.layout import LayoutPredictor
from surya.reading_order import ReadingOrderPredictor
image = Image.open(image_path)
# Get layout
layout_predictor = LayoutPredictor()
layout_results = layout_predictor([image])
# Get reading order
order_predictor = ReadingOrderPredictor()
order_results = order_predictor([image], layout_results)
structure = {
'title': None,
'sections': [],
'tables': [],
'figures': []
}
current_section = None
for element in order_results[0].ordered_bboxes:
if element.label == 'Title':
structure['title'] = element
elif element.label == 'Section-header':
current_section = {'header': element, 'content': []}
structure['sections'].append(current_section)
elif element.label == 'Table':
structure['tables'].append(element)
elif element.label == 'Figure':
structure['figures'].append(element)
elif current_section and element.label in ['Text', 'List-item']:
current_section['content'].append(element)
return structure
Table Region Extraction
def extract_table_regions(image_path):
"""Extract table regions from document."""
from surya.layout import LayoutPredictor
image = Image.open(image_path)
layout_predictor = LayoutPredictor()
results = layout_predictor([image])
tables = []
for element in results[0].bboxes:
if element.label == 'Table':
bbox = element.bbox
# Crop table region
table_image = image.crop(bbox)
tables.append({
'bbox': bbox,
'image': table_image,
'confidence': element.confidence
})
return tables
Examples
Example 1: Academic Paper Analysis
from surya.layout import LayoutPredictor
from surya.reading_order import ReadingOrderPredictor
from pdf2image import convert_from_path
def analyze_academic_paper(pdf_path):
"""Analyze structure of academic paper."""
images = convert_from_path(pdf_path)
layout_predictor = LayoutPredictor()
order_predictor = ReadingOrderPredictor()
paper_structure = {
'pages': [],
'element_counts': {
'Title': 0,
'Section-header': 0,
'Text': 0,
'Table': 0,
'Figure': 0,
'Formula': 0,
'Footnote': 0
}
}
layout_results = layout_predictor(images)
order_results = order_predictor(images, layout_results)
for page_num, (layout, order) in enumerate(zip(layout_results, order_results)):
page_structure = {
'page': page_num + 1,
'elements': []
}
for element in order.ordered_bboxes:
page_structure['elements'].append({
'type': element.label,
'bbox': element.bbox,
'order': element.position
})
# Count element types
if element.label in paper_structure['element_counts']:
paper_structure['element_counts'][element.label] += 1
paper_structure['pages'].append(page_structure)
return paper_structure
paper = analyze_academic_paper('research_paper.pdf')
print(f"Total tables: {paper['element_counts']['Table']}")
print(f"Total figures: {paper['element_counts']['Figure']}")
Example 2: Form Field Detection
from surya.layout import LayoutPredictor
from PIL import Image
def detect_form_fields(image_path):
"""Detect form fields and labels."""
image = Image.open(image_path)
layout_predictor = LayoutPredictor()
results = layout_predictor([image])
form_fields = []
for element in results[0].bboxes:
# Look for text elements that might be labels
if element.label == 'Text':
# Check if there's a box/line nearby (potential input field)
form_fields.append({
'type': 'potential_label',
'bbox': element.bbox,
'confidence': element.confidence
})
return form_fields
fields = detect_form_fields('form.png')
print(f"Found {len(fields)} potential form elements")
Example 3: Multi-column Article
from surya.layout import LayoutPredictor
from surya.reading_order import ReadingOrderPredictor
from PIL import Image
def process_multicolumn_article(image_path):
"""Process multi-column article layout."""
image = Image.open(image_path)
layout_predictor = LayoutPredictor()
order_predictor = ReadingOrderPredictor()
layout_results = layout_predictor([image])
order_results = order_predictor([image], layout_results)
# Group elements by column
image_width = image.width
column_threshold = image_width / 2
columns = {
'left': [],
'right': [],
'full_width': []
}
for element in order_results[0].ordered_bboxes:
bbox = element.bbox
element_center = (bbox[0] + bbox[2]) / 2
element_width = bbox[2] - bbox[0]
# Determine column
if element_width > column_threshold * 1.5:
columns['full_width'].append(element)
elif element_center < column_threshold:
columns['left'].append(element)
else:
columns['right'].append(element)
return {
'layout': 'multi-column',
'columns': columns,
'reading_order': order_results[0].ordered_bboxes
}
article = process_multicolumn_article('newspaper_page.png')
print(f"Left column: {len(article['columns']['left'])} elements")
print(f"Right column: {len(article['columns']['right'])} elements")
Limitations
- Handwritten layouts may be inaccurate
- Very small text regions may be missed
- Complex nested layouts challenging
- GPU recommended for batch processing
- Multi-language support varies
Installation
pip install surya-ocr
# For PDF processing
pip install pdf2image