This paper introduces a preprocessing method for efficient compression of multi-camera images in FTV (Free viewpoint Television). In every multi-camera system, it is difficult to precisely align cameras at the desired place. In this paper, we propose a preprocessing method that transforms the captured multi-camera images by projective transformation matrices to compensate for this misalignment. This transformation increases the efficiency of image compression because multi-camera images become more correlative. Furthermore, we propose a method for finding the projective transformation matrices automatically in consideration of the epipolar geometry. Experimental results show that PSNR gains up to 3.0 dB in comparison with the compression without any processing when MPEG-2 is used in the condition ranging from 1.6 to 3.0 Mbps.
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