For a procam to preserve the color appearance of an image projected on a color surface, the photometric distortion introduced by the color surface has to be properly compensated. The performance of such photometric compensation relies on an accurate estimation of the projector nonlinearity. In this paper, we improve the accuracy of projector nonlinearity estimation by taking inter-pixel coupling into consideration. In addition, to respond quickly to the change of projection area due to projector movement, we reduce the number of calibration patterns from six to one and use the projected image as the calibration pattern. This greatly improves the computational efficiency of re-calibration that needs to be performed on the fly during a multimedia presentation without breaking its continuity. Both objective and subjective results are provided to illustrate the effectiveness of the proposed method for color compensation.

中文翻译：

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通过减少像素间耦合和校准图案来增强和加快投影仪的光度补偿

对于要保留投影在彩色表面上的图像的彩色外观的procam，必须适当补偿彩色表面引入的光度失真。这种光度补偿的性能取决于对投影仪非线性的准确估计。在本文中，我们通过考虑像素间耦合来提高投影仪非线性估计的准确性。此外，为了快速响应因投影机移动而导致的投影面积变化，我们将校准图案的数量从六个减少到一个，并将投影图像用作校准图案。这极大地提高了在多媒体演示过程中需要即时执行的重新校准的计算效率，而不会破坏其连续性。