Acquisition process
The acquisition system is composed of a base, a dome illuminator and a digital camera (Fig .1). A series of reference holes on the base enables to change the relative rotation between the camera and the granite tile. The current version supports the same set of rotation angles used in Outex: 0°, 5°, 10°, 15°, 30°, 45°, 60°, 75° and 90°.

Acquisition systemFig. 1 The acquisition system

To retain a sampling are common to all the rotation angles, the original images - the resolution of which is 1024 x 768 - are cropped with a centered window of dimension 544 x 544, as shown here.

Technical data

Spectrum Illumination Monster Dome Light 18.25" with white HB LEDs. Technical data aveilable here.

Samsung S850. Technical data available here.

Camera's settings:
  • Image resolution: 1024 x 768
  • image format: JPEG
  • Shutter speed: fixed (1/30 s)
  • f-stop: fixed (7.4)
  • ISO: 50
  • Macro: on
Università degli Studi di Perugia
Dipartimento Ingegneria Industriale
Via G. Duranti, 67
06125 Perugia (ITALY)
Tel.: 0039 075 5853706
Universidade de Vigo
Escuela de Ingeniería Industrial
Campus Universitario
36310 Vigo (SPAIN)
Tel.: 0034 9868 18602

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