Since the images of neighboring projectors overlap, a smooth transition between the different projectors is desirable. The goal is to create a display that appears homogeneous while minimizing the negative effects on the display's quality, such as loss in contrast or shifted colors due to imperfections in the measured projector transfer function. TheseĪre then inverted and used to apply the correction needed to create a homogeneous image. To achieve specific changes in the projected intensities, the projector's response to a specified input value must be known. The photometric calibration deals with the determination of projector internal attributes and the compensation of differences in the projected intensities. Since these projectors cannot be perfectly aligned, the state of the art approach is to calibrate the display geometrically and photometrically ( Multi-projector display systems use multiple projectors on one screen to enhance resolution and brightness of the display.
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