 Experimental Apparatus
 All of images in my texture database are captured by digital camera
Vosskuhler CCD 1300LN (specifications of this camera can be accessed
via www.vdsvossk.de). This is used with a Matrox PC-SIG framestore.
The light source is a filament tube with a mask, which is fixed on
an arm in order to move to the specified slant and tilt angle. The
general capture setup is illustrated below.
Illumination geometry:
- the test surface is mounted in the x-y plane and is perpendicular
to the camera axis (the z-axis).
- the test surface is illuminated by a point
source located at infinity,
i.e. the incident vector field is uniform in magnitude and direction
over the test area.
- the tilt angle of illumination is the angle that the projection
of the illuminant vector incident onto the test surface plane makes
with an axis in that plane.
- the slant angle is the angle that the illuminant vector makes
with a normal to the test surface plane.
- surface rotation is measured in the x-y plane.
Example of photometric stereo images illuminated by different lighting
sources
Technical Data for Digital Camera CCD 1300LN:
- Resolution: 1280(H) by 1024(v) pixels
- Pixel size: 6.7 um by 6.7 um
- Progressive scan
- Interline-transfer sensor (IT)
- Active sensor size: 8.58(H) mm by 6.86(V) mm
- Electronic shutter up to 1/100000 sec. (Image on demand)
- Effective dynamic: up to 1:2000 (>=66 dB)
- Digital output: 12-bit, RS-644
- Frame system: 1050 lines
- Power supply: +12V, max 0.45A
- Lens mount: C-mount (2/3")
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