PDF Drawing Analysis

PDF drawing analysis – automatically evaluate technical PDF drawings

This tool analyses technical drawings in PDF format and extracts structured information from technical documents, manufacturing drawings and design documentation.

The PDF file is processed server-side and automatically deleted after analysis.

What is PDF drawing analysis used for?

Technical PDF drawings often contain dimensions, title blocks, revision information, technical notes and geometry data. This tool supports automated evaluation of this information.

Typical use cases:

• Quality control of supplier drawings
• Review of manufacturing documentation
• Preparation for ERP, PDM and CAM systems
• Digitisation of archive drawings
• automatic capture of drawing data

Which functions are supported?

PDF drawing analysis combines OCR, image processing and document analysis.

• OCR text recognition for scanned drawings
• Detection of dimensions and dimensioning
• Extraction of title blocks
• Detection of revision status
• Analysis of technical text and drawing information
• Line and contour detection with OpenCV

How does the analysis work?

1. Upload PDF file
2. Convert pages into image data
3. Preprocess the drawing
4. Perform OCR and text recognition
5. Analyse geometry and technical information
6. Generate a structured analysis report

Depending on the document type, both vector information and scanned content are evaluated.

Which information can be detected?

• Drawing numbers
• Part descriptions
• Revision status
• Dimensions
• Dates and approvals
• technical notes
• Title block information

Technologies

Modern open-source technologies are used for the analysis:

• Tesseract OCR
• OpenCV
• Python-based document analysis
• PDF processing and text extraction

Current limitations

• Current maximum file size is 80 MB per PDF file
• By default, the first pages are analysed
• OCR quality depends on resolution and image quality
• Very complex drawings may cause longer analysis times