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Spectrophotometric method for optimizing image capture conditions for inspecting protected documents



  1. Optoelectronica-2001 SA, Bucharest, Romania
  2. University “Politehnica” of Bucharest, Academic Center for Optical Engineering and Photonics, Faculty of Applied Sciences, Physics Department, Romania
  3. Academy of Romanian Scientists, Splaiul Independentei No. 54, Bucharest 050094, Romania


The study presents a spectrophotometric system and method for the verification of documents based on the control of light sources and the correct lighting, to have a clear image. It points out the need to optimize optical schemes, measurements and estimates by additional means of illumination. It analyses the opportunity to use CMOS sensor of Digital Camera for spectrophotometric colour measurement in diffused reflection. The method of control of the reflection spectrum, proposed in the work will allow improving the device. For a document verification device, the spectrophotometric measurement function is very important, thus pursuing the integration of several functions in one device. Devices of colo ur reproduction appear more and more sophisticated hence the need to detect counterfeits by analysing ink by spectroscopic methods in addition to other verification methods is essential..


Optical security elements, Optical properties, Optical methods, Spectroscopic imaging.

Submitted at: Sept. 26, 2017
Accepted at: Nov. 28, 2017


T. NECSOIU, G. BOSTAN, P. STERIAN, Spectrophotometric method for optimizing image capture conditions for inspecting protected documents, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 11-12, pp. 729-737 (2017)