AUTOMATIC INSPECTION OF DRILL-HOLES AND THREADS

• Abstract:

  Due to the cylindrical shape of drill-holes and inner threads the acquisition of high-resolution images has not yet been solved satisfactorily. Different possibilities for taking pictures from the inside of a drilled hole are reviewed and evaluated with respect to the quality of the images. Results show, that a ring-shaped CMOS-Sensor works best for the purpose of automatic inspection.
  Additionally, the analysis of these images requires a special algorithmic approach, which is able to take care of the cylindrial shape of the object. To achieve this, the use of the Z-transformation is recommended for processing of such images, and it is shown to be superior to other image processing operators.
• Keywords:

  automatic inspection, inner threads, technical diagnostic
• Download:

  IMEKO-WC-2000-TC14-P365.pdf
• DOI:

  _unreg_wc-2000.365

Event details: