Digital fringe projection profilometry is a well-established technique for measuring three-dimensional surfaces. Typically, straight fringes are projected over an object to be measured and a recording system from a different view angle are used to capture deformed fringes due to the objects surface. Circular fringes have been also successfully used with this configuration to recover the topography of the specimen studied. However, typical experimental setups, where the projector is angled to the camera optical axis, may generate shadows and occlusions that introduce noise during image processingImage processing. A solution already proposed is to place both the projector and the camera aligned perpendicularly to the object but the imaging system used with the camera must be a telecentric one. In this study we propose this last configuration but without the need of the telecentric system. This simplified set up is tested and compared with traditional arrangements that em-ploys straight fringes with good results.

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Enhanced Digital Fringe Projection Profilometry Using Circular Stripe Patterns: A Novel Approach for 3D Surface Measurement

  • Aarón Alcaraz-Tapia,
  • Francisco Gerardo Peña-Lecona,
  • Jesús Muñóz-Maciel,
  • Miguel Mora-González,
  • Yadira Fabiola López-Álvarez,
  • Sergio Álvarez-Rodríguez

摘要

Digital fringe projection profilometry is a well-established technique for measuring three-dimensional surfaces. Typically, straight fringes are projected over an object to be measured and a recording system from a different view angle are used to capture deformed fringes due to the objects surface. Circular fringes have been also successfully used with this configuration to recover the topography of the specimen studied. However, typical experimental setups, where the projector is angled to the camera optical axis, may generate shadows and occlusions that introduce noise during image processingImage processing. A solution already proposed is to place both the projector and the camera aligned perpendicularly to the object but the imaging system used with the camera must be a telecentric one. In this study we propose this last configuration but without the need of the telecentric system. This simplified set up is tested and compared with traditional arrangements that em-ploys straight fringes with good results.