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OCR for Embossed and Direct Part Marking Text

​​Low contrast, variable lighting, and textured surfaces make reading embossed and direct part marked (DPM) text a challenge in manufacturing environments. Cognex AI-powered optical character recognition (OCR) solutions overcome these issues to deliver reliable, accurate reads on fast production lines, ensuring critical traceability and compliance.​

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​​Why traditional OCR struggles with DPM and traceability​ 

​​Part traceability is critical for inventory management, safety, regulatory compliance, and counterfeit prevention. Direct part marked (DPM) characters, such as serial numbers and safety codes, are designed to last the product's lifetime but are notoriously difficult to read. These markings, often embossed or cast onto uneven surfaces like metal parts, automotive tires, or textured plastics, present unique challenges for traditional OCR systems due to:

  • ​Low contrast between characters and substrate, as both are made of the same material.
  • ​Shadows and reflections that shift with slight changes in lighting angle or intensity.
  • Variations in material composition between production lots, altering the appearance of marks. 

​​Smarter OCR code reading that keeps up with your line​ 

Traditional OCR struggles to consistently read these markings, especially when faced with low contrast, variable reflectivity, and molding defects, leading to inefficiencies and potential traceability gaps. AI-based technology offers an ideal solution by adapting to variations in lighting, texture, and defects – ensuring direct part marked OCR codes are read accurately and consistently every time.

AI-powered OCR technology is designed to tackle the most challenging direct part marking scenarios. Whether dealing with low contrast between characters and surfaces, variable reflectivity, or uneven and textured materials, these solutions provide unmatched adaptability. This adaptability keeps production lines running smoothly, reduces downtime, and ensures traceability and compliance. 

​​Flexible, fast, and accurate OCR with Cognex machine vision​ 

​​Cognex 3D vision systems combine AI-powered OCR, advanced 3D imaging, and smart lighting to accurately read embossed and DPM text, even on complex surfaces. Key features include:

  • ​Pretrained font libraries and flexible AI training for consistent recognition of raised lettering.
  • ​Quick retraining with new images to handle changes in supplier materials, part color, or texture.
  • ​Robust performance on uneven surfaces, ensuring consistent and accurate DPM code reading every time.

​With Cognex OCR, manufacturers can achieve unmatched traceability, reduce manual inspections, and maintain compliance, even in the most challenging production environments. And when challenges do arise, the Cognex global support network and our wide range of learning and support content are there to help you get back up to speed. ​ 

Optical character recognition vs. optical character verification

OCR vs. OCV in Manufacturing

Learn the difference between optical character recognition (OCR) and optical character verification (OCV), use cases for each, and how to enhance traceability and code quality. 

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