The traditional camouflage is based on a number of irregular spots or stripes, whose edges are smooth as well as they have clear boundaries between different colors. The visual distinction degree is so strong that the camouflage effect is debased. The digital camouflage can break the boundary of a camouflaged target between different colors, and make it blurred and broken, so as to attain a better camouflaged effect. An algorithm which can generate digital camouflage figures is presented with background images of the target. It quantizes the colors of the background, extracts the dominant colors, and then determines the size of a mosaic block. Finally, the digital camouflage figure is generated. The experimental result shows that, the digital camouflage is easier to blend with the natural background than the traditional camouflage, and achieves a good effect of the optical camouflage.