Methods for designing and producing a security feature
AssigneeKoenig & Bauer Banknote Solutions SA
InventorRobert Laird Stewart
Life of this patent
Estimating the term…
Abstract
Methods for designing and producing a security feature are provided. In general, the present disclosure provides methods of designing a printed image in a security feature, the security feature comprising an array of optical elements overlaying the printed image, wherein the printed image comprises a two dimensional matrix of rows and columns of pixels, the method comprising; correcting for a mismatch between the pixels of the printed image and the array of optical elements by doing one or more of: adding one or more pixels; removing one or more pixels; and moving one or more pixels.
Claims25
A method of designing a printed image in a security feature, the security feature comprising an array of optical elements overlaying the printed image, wherein the printed image comprises a two dimensional matrix of rows and columns of pixels, the method comprising:
- calculating for each row and column at least one drift value, wherein the drift value for any pixel is equal to the difference between an actual position for said pixel and the desired position for said pixel;
- determining, based on said at least one drift value, one or more locations in the printed image to remove a pixel from the printed image and/or to add a pixel to the printed image;
- and
- adding or removing at least one pixel at the one or more locations;
- wherein the one or more locations are determined by calculating a number of pixels to be removed from or added to the printed image and randomly selecting that number of locations.
A method of designing a printed image in a security feature, the security feature comprising an array of optical elements overlaying the printed image, wherein the printed image comprises a two dimensional matrix of rows and columns of pixels, the method comprising:
- calculating for each row and column at least one drift value, wherein the drift value for a pixel is equal to the difference between an actual position for said pixel and the desired position for said pixel;
- determining, based on said at least one drift value, one or more locations in the printed image to remove a pixel from the printed image and/or to add a pixel to the printed image;
- and
- adding or removing at least one pixel at the one or more locations;
- wherein each optical element is associated with a group of pixels,
- wherein each of the one or more locations is selected from a group of pixels which contains a pixel having a drift value associated with a specified drift value.
A method of designing a printed image in a security feature, the security feature comprising an array of optical elements overlaying the printed image, wherein the printed image comprises a two dimensional matrix of rows and columns of pixels, the method comprising:
- identifying a plurality of objects within the printed image, wherein each of the plurality of objects comprises one or more pixels;
- wherein at least one of the plurality of objects is adjusted by moving all the pixels in the object a first specified distance based on a nominal drift value for the object.
Dependencies are inferred from the claim text.