Automatic color matching for tiled multiple projectors

• Main Authors: FANG-TIEN CHEN, 陳芳鈿
• Other Authors: Din-Chang Tseng
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/27444905222479912182

碩士 === 國立中央大學 === 資訊工程學系碩士在職專班 === 94 === To produce a large screen, one economical way is using multiple projectors to tile. However, each projector has its individual luminance and color characteristics due to different electronic components and light bulbs. The tiled screen then appears the non-uniform color and luminance and has blocking effect. In this study, we use a camera to capture the tiled screen, and propose two automatic calibration methods to resolve the non-uniform color and luminance problems. At last, we generate the feedback control signal to the multiple projectors through the RS-232 port to automatically adjust the projectors. The first method is gamma curve adjusting method, it uses lowest lightness projector to produce known gamma lookup table, and then use this table to individually adjust the gamma curve of each projector; the second method is color coordinate adjusting method, it adjusts color coordinate of primary color of each projector directly. The first method needs to adjust every step of gamma lookup table, it seems hard; the second method needs to use integrated circuit built-in feature, the portability is not so good. Each method has both advantages and disadvantages. Users need to decide what method will be adopted by their application.