Code verification on glossy surfaces

Reproducible measurement results due to diffuse illumination

Anyone who has to verify codes on products with glossy, mirrored or reflective surfaces often faces a challenge: the environment is reflected on the surface. Metal is especially affected in by this. Usable reproducible measurement results are hardly or not at all possible.

To avoid reflections and mirroring, you need the right distance to the object, the right camera module and, above all, the right illumination. To be precise, diffuse illumination is required. Diffuse illumination is a uniform, soft light without shadowing, contrast as well as extraneous light influences. This artificial indirect light is achieved by a diffuser (diffusing screen) that disperses the direct light before it reaches the product. For extremely diffuse lighting or DOME lighting, on the other hand, a matt white tube is used in the measuring chamber. Highly glossy surfaces are thus no longer a challenge.

Objects from medical devices or the automotive industry often have complex 3D geometries that make it impossible to place the code to be verified directly on the code verification system. But this is a decisive point in order to achieve the goal of reproducible measurement results. A height-adjustable stand can provide a solution here. Integrated into the stand, the verification device can be precisely aligned with the product and the code can be measured.

And the last decisive factor is the focal length of the camera module and, inextricably linked to this, the focus position of the object. The selected optics modules must be adapted to the code size and module size, and furthermore, they must consider the distance (focus position) between the object and the verification device.

All factors combined provide reliable and reproducible measurement results and quality assessments as required by marking regulations, such as the Medical Device Regulation (MDR). Time delays caused by manual input, because the code is not read immediately the first time, no longer disrupt operations.

The benefits of diffuse illumination

At a glance

  • Verification of codes on glossy surfaces
  • Orientation-independent, stable and repeatable verification results on reflective substrates
  • No side-effects due to reflections
  • Contact-free measurements with the VeriCube stand
  • Verification of codes inside cavities
  • Exchangeable camera modules to adapt to different code sizes and measuring distances
  • Verification of codes on 3D objects

REA Tutorial

Code verification on reflective surfaces

Where is diffuse illumination required?

Areas of application, industries and regulations

  • Medical Technology
  • Automotive
  • Electronics Industry
  • Unique Device Identification (UDI)
  • Medical Device Regulation (MDR)
  • Metal Products
  • Medical Devices
  • Machine Engineering


Examples from practice

  • Measurement of directly marked parts
  • Compliance with the mandatory marking of medical devices (MDR)
  • Unique Device Identification (UDI)
  • 2D codes on printed circuit boards
  • 3D objects with challenging geometries
  • Indented codes
  • 1D and 2D codes on component parts

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