Estimating Case Study

Window Schedule OCR & Rough Opening Extraction

Client Profile: Glazing Subcontractor & Window Manufacturer

The Engineering Challenge

Scanned blueprint schedule sheets featured rotated text, non-standard abbreviations, and complex dimension callouts that generic OCR tools failed to parse.

Input Drawings

High-resolution scanned blueprint schedule sheets (300 DPI TIFF/PDF).

Output Delivered

CSV spreadsheet + REST API payload

AI & Technical Solution

360° rotated OCR, schedule grid detection, dimension text normalizer, and rough opening calculator.

Tech Stack Deployed

OpenCV Deskew EngineTrOCR Fine-Tuned ModelShapely Geometry BoundsFastAPI Service

Measured Results & Impact

1Achieved 98.6% OCR accuracy on 90° rotated window schedule text.

2Processed 1,200 window schedule lines in under 3 minutes.

3Eliminated order specification errors on commercial glazing bids.

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