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DLP LightCrafter 4500,Pattern Sequence模式下投影正弦渐变图像出现失真

图1.目标投影图像

图2 video model下投影图片

图3 Pattern Sequence模式下投影失真

Video模式下有时也出现图3的失真,但切换到Imternal Test Pattern选项后再切换 回Images from Flash显示就能投影正常,请问这要怎样解决?