Method for encoding original image in safety device of e.g. identity document, involves determining tuple of each pixel of images by applying encoding function to pixel tuple counterpart of original image or initial image

摘要

The method involves determining a tuple of each pixel of images by applying an encoding function to a pixel tuple counterpart of an original image (Ii) or initial image. Each pixel is defined by the tuple of colorimetric coordinates on the basis of a set of colors. A final image (If) is represented by the arrangement of the pixels. The arrangement of pixels of the final image is provided with a set of dimensions that is same as dimensions of an arrangement of pixels of the initial image. Independent claims are also included for the following: (1) a safety device (2) a method for manufacturing a safety device (3) a method for checking a safety device.