使用random grid法將秘密影像分解成兩張無意義的分享圖，將兩張分享圖重疊可獲得秘密影像。與以往random grid法的差異點在於，此方法可以減少像素，但仍然可以看到秘密影像。-Random grid method using a secret image is decomposed into two meaningless to share maps, will be available two to share a secret map of overlapping images. The previous law random grid point of difference lies in the fact that this method can reduce the pixels, but still can see the secret image.