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.