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What is Layout Analysis
What is Layout Analysis?
Layout analysis is the automated mapping of a document's visual and structural organization. It identifies and locates elements such as:
- Headers and paragraphs
- Columns and tables
- Images and form fields
- Spatial relationships between all of the above
Layout analysis vs. Document analysis
Layout analysis is the structural component of document analysis. The table below shows how the two approaches differ.
| Feature | Layout analysis | Document analysis |
|---|---|---|
| Focus | Visual and structural organization of documents | Comprehensive understanding of document content |
| Purpose | Identifying layout elements such as headers, tables, and images | Extracting meaning, relationships, and context from the document |
| Examples of output | Page structure, spatial relationships | Text content, metadata, semantic details |
| Level of detail | Structural and spatial | Structural, spatial, and semantic |
How layout analysis works
Layout analysis uses computer vision to build a spatial model of the document, and this spatial model guides subsequent extraction. Knowing that a value appears in a table cell in the third column of the second row carries more extraction meaning than knowing it appears at a particular pixel coordinate.
When accurate layout analysis is essential
For complex document types, accurate layout analysis is a prerequisite for reliable data extraction. These include:
- Multi-column layouts
- Nested tables
- Forms with variable field positioning
