Why does extra sharpening make readable plates harder for OCR?

Answered by ANPR AI·Sourced

Short answer

Artificial enhancement can distort character boundaries.

Explanation

Edge and contrast processing may create misleading outlines.

Things to check

  • Sharpening
  • Contour enhancement
  • Compression

What to do

Reduce enhancement and compare original plate crops. Tune for stable character detail rather than a visually dramatic surveillance image.

Source

XProtect VMS Administrator Manual 2019 R2

Scope and version

2019 R2; optical guidance, not current software requirements

ANPR Edge

Skip the dedicated ANPR camera. Read plates from the cameras you already have.

ANPR Edge is plate-recognition software that runs on a PC at your site and works with ordinary IP cameras, so plate reads no longer depend on one vendor's camera, NVR or firmware.

  • Works with standard IP cameras over RTSP
  • One license per location covers every camera
  • Runs on a Windows PC or Mac you own

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