Access Restriction

Author Knoll, A. ♦ Sasse, R.
Source CiteSeerX
Content type Text
Publisher Springer
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Active Stereometric Triangulation Technique ♦ Entire Scene ♦ Range Image Generation ♦ Light Source ♦ Colour Stripe ♦ High Response Stability ♦ Search Process ♦ Uniform Intensity ♦ Special Camera ♦ Technical Product ♦ Colour-based Technique ♦ Absolute Colour ♦ Single Pair ♦ Stereoscopic Configuration ♦ Continuous Colour Pattern ♦ Single Camera Boyer ♦ Preliminary Finding ♦ Special Continuous Non-repetitive Pattern ♦ Passive Stereo ♦ Prominent Object Feature ♦ Different Reflectance Function ♦ Dense Range Image ♦ Serial Triangulation Technique ♦ Acquisition Time ♦ Nonstructured Scene ♦ Fast Moving Object ♦ Large Dynamic Range
Description this paper, a special continuous non-repetitive pattern of hues illuminates the entire scene. The object so illuminated is seen by two colourcameras. Correspondences of all points visible in both cameras can be found from a single pair of images. The search process is similar to the process employed with passive stereo. This obviates the need for scanning and makes the generation of dense range images from a single snap-shot possible. Thus, the acquisition time is only dependent on the shutter speed of the cameras. This is in contrast to all serial triangulation techniques and enables the range image generation of fast moving objects. Consequently, a sensor based on the technique is immune to motion problems. Since two cameras in a stereoscopic configuration are used, the criterion to be met by corresponding points is that they have the same colour in both images. This colour is not necessarily equivalent to the colour that was emitted from the light source. This is the reason, therefore, that the method is perfectly well suited to nonstructured scenes of uniform intensity (a search for edges or prominent object features is never necessary) but sets it apart from other colour-based techniques that employ a sequence of colour stripes whose absolute colour must be identified in an image recorded with a single camera [Boyer 87, Plamann 91, Monks 92]. Unlike these, the proposed method is insensitive to colour changes caused by the object (provided they evenly affect both cameras) and does not depend on special cameras with high response stability over a large dynamic range (such as the method described in [Tajima 87]). Preliminary findings (see sec. 3) indicate that this is true for most materials with different reflectance functions, which are used for technical products (...
Graphics and Robotics
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 1995-01-01