Uv fluorescence encoded background images using adaptive halftoning into disjoint sets

摘要: Systems and methods are described that facilitate generating a background image with UV-fluorescent watermark for printing on document. A binary mask is generated to separate the into UV-active UV-dull regions. Based assigned value of mask, each pixel or color using an adaptive halftoning technique, in order generate image. watermarked by combining images, printed The colors have different UV intensities under light, but indistinguishable normal lighting conditions. In this manner, visible when exposed light.