%0 Journal Article
%A Flood, Colin
%A Köthe, Ullrich
%A Zink, Ralf
%A Teledyne Dalsa,
%A Universität Heidelberg,
%A Robert Bosch GmbH,
%D 2013
%F heidok:15209
%R 10.11588/heidok.00015209
%T Using an n-zone TDI camera for acquisition of multiple images with different illuminations in a single scan
%U https://archiv.ub.uni-heidelberg.de/volltextserver/15209/
%X For fast scanning of large surfaces with microscopic resolution or for scanning of roll-fed material, TDI  line scan cameras are typically used. TDI cameras  sum up the light collected in adjacent lines of the   image sensor synchronous to the motion of the object.  Therefore TDI cameras have much higher sensitivity  than standard line cameras. For many applications  in the field of optical inspection more than one image of the object under test are needed with different  illumination situations. For this task we need either  more than one TDI camera or we have to scan the object several times in different illumination situations.  Both solutions are often not entirely satisfying. In  this paper we present a solution of this task using a  modified TDI sensor consisting of three or more separate TDI zones. With this n-zone TDI camera it  is possible to acquire multiple images with different  illuminations in a single scan. In a simulation we  demonstrate the principle of operation of the camera  and the necessary image preprocessing which can be  implemented in the frame grabber hardware.