QR Codes: follow the dots without getting lost!
summary
A hands-on session showing how to build a QR-code reader using minimal tools: capture and analyze webcam video with OpenCV to locate the code, then extract and decode its payload using Reed–Solomon error-correction. The talk explains why QR reading remains fast and robust on low-quality or partially damaged images by demonstrating the detection pipeline and error-correction decoding implementation.
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chapters (13)
- 0:00Introduction
- 1:27Decoding QR codes manually
- 8:48Presentation structure
- 11:18Detecting alignment markers
- 18:43Straightening QR code
- 34:40Enhancing contrast and image
- 45:10Extracting binary points
- 57:00Reading metadata and version
- 1:07:31Decoding format and mask
- 1:23:22Reading content bits
- 1:31:36Error correction with Reed-Solomon
- 1:48:48Final message decoding
- 1:59:04Summary
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