Cancellation of Image Crosstalk in Time Sequential Displays of Stereoscopic Video Cancellation of Image Crosstalk in Time Sequential Displays of Stereoscopic Video

Rapport technique de l'INRS-T el ecommunications no. 97-01 Preliminary work on crosstalk cancellation was carried out by Bertrand Lacotte of ENST, Paris during his stay at INRS-T el ecommunications between August and December 1995 and then described in a preliminary report 3]. The work was continued in 1996 by the other two authors. This report is an exact replica of a paper submitted to the IEEE Transactions on Image Processing in February 1997. Research Council of Canada and by t h e F onds pour la formation de chercheurs et l'aide a l a r e c herche (FCAR), Qu ebec, Canada. Summary Stereoscopic visualization systems based on liquid crystal shutter (LCS) eyewear and cathode-ray t u b e (C R T) displays provide today the best overall quality of 3-D images and therefore have a dominant position in commercial as well as professional markets. Due to the CRT and LCS characteristics, however, such systems suuer from perceptual crosstalk (\shadows") at object boundaries that can reduce, and at times inhibit, the ability to perceive depth. In this paper, we propose a method to reduce such crosstalk. We present a simple model for intensity leak, we assess model parameters for a time-sequential LCS/CRT system and we propose a computationally-eecient algorithm to eliminate the crosstalk. Since the full crosstalk elimination implies an unacceptable image degradation (reduction of contrast), we study the trade-oo between crosstalk elimination and image degradation. We describe experiments on synthetic and natural stereoscopic images and we discuss informal subjective viewing of processed images. Overall, the viewer response has been very positivee 3-D perception of many objects became either much easier or even eeortless. Since the proposed algorithm can be easily implemented in real time (only linear scaling and table look-up are needed), we believe that it can besuccessfully used today in various stereoscopic applications suuering from image crosstalk.