Patent ID: 9124819
Filing Date: 2015-09-01
Classification: G06T,H04N

Abstract:
1. A manufacturing method for a watermark, comprising steps of: providing a plurality of AM (amplitude modulations halftone dot sets equidistantly spaced apart from each other to form a first region of a personalized pattern, wherein at least one of the AM halftone dot sets has a plurality of adjacent ink portions within the same AM halftone dot set; filling a plurality of blank portions for each of the AM halftone dot sets that has the adjacent ink portions within the same AM halftone dot set, wherein an equidistant blank portion is filled between two of the adjacent ink portions to make the ink portions be equidistantly spaced apart from each other and have an interval within the same AM halftone dot set smaller than an interval between any two of the adjacent AM halftone dot sets; providing a plurality of FM (frequency modulations) halftone dots to form a second region of the personalized pattern; and printing the personalized pattern onto a paper by digital halftoning technique to form a watermark pattern that can appear after being copied.