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Related Experiment Video

Updated: Jan 20, 2026

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High dynamic range capture and sensor calibration to improve microscale halftone ink and paper surface

Louis Vallat-Evrard1, Lionel Chagas1, Raphaël Passas1

  • 1Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), LGP2, F-38000 Grenoble, France.

The Review of Scientific Instruments
|September 2, 2019
PubMed
Summary

This study introduces a High Dynamic Range (HDR) imaging method for microscale analysis of printed dots. This technique enhances accuracy in measuring print characteristics for document authentication.

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Area of Science:

  • Print Science
  • Optical Metrology
  • Imaging Technology

Background:

  • Traditional macroscopic measurements of printed dots lack microscale detail.
  • Understanding ink behavior within paper is crucial for print analysis.

Purpose of the Study:

  • To develop and validate a microscale imaging method for accurate characterization of halftone dots.
  • To compare print quality across offset, inkjet, and electrophotography using microscale analysis.
  • To explore the potential of microscale print analysis for document authentication.

Main Methods:

  • Combined optical microscopy with a commercial camera and High Dynamic Range (HDR) capture.
  • Optimized acquisition parameters including area size, exposure time, and image fusion.
  • Quantified method development stages and compared to simple imaging techniques.

Main Results:

  • The High Dynamic Range (HDR) method significantly improved measurement accuracy, reducing the coefficient of variation from 30% to 5%.
  • Enabled retrieval of microscale information on ink dot shape and light diffusion in paper.
  • Accurately assessed macroscopic variables like optical densities and colorimetric values.

Conclusions:

  • Microscale analysis using HDR imaging provides superior accuracy for characterizing printed dots compared to traditional methods.
  • The developed method offers valuable insights for differentiating printing technologies and enhancing document authentication capabilities.