METHOD FOR GENERATING RELIEF PRINTS
First Claim
1. A method for generating a relief print on a substantially flat substrate, wherein palpable differences exist between a height of various parts of the relief print, by a printer configured to print a relief print in a number of passes, the method comprising the steps of:
- a) defining a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image;
b) determining a low spatial frequency height component in the height value of a pixel of the rasterized relief image by applying a filter operation by means of a convex kernel;
c) subtracting the determined low spatial frequency height component from the height value of a pixel of the rasterized relief image resulting in a reduced height value; and
d) printing the rasterized relief image by using the reduced height value,wherein the step of determining the low spatial frequency height component comprises the sub-steps of;
b1) moving the convex kernel over a plurality of positions in the rasterized relief image;
b2) for each position of the plurality of positions, determining a minimum height difference between the image height and the kernel height; and
b3) for each position of the plurality of positions, setting the low spatial frequency height component to the minimum height difference determined in step b2).
1 Assignment
0 Petitions
Accused Products
Abstract
A method for generating a relief print on a substantially flat substrate, wherein palpable differences exist between a height of various parts of the relief print, by a printer configured to print a relief print in a number of passes includes defining a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image, determining a low spatial frequency height component in the height value of a pixel of the rasterized relief image, subtracting the determined low spatial frequency height component from the relative height value of a pixel of the rasterized relief image, resulting in a relative reduced height value, and printing the rasterized relief image by using the relative reduced height value. A printing system is configured to execute the method.
4 Citations
9 Claims
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1. A method for generating a relief print on a substantially flat substrate, wherein palpable differences exist between a height of various parts of the relief print, by a printer configured to print a relief print in a number of passes, the method comprising the steps of:
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a) defining a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image; b) determining a low spatial frequency height component in the height value of a pixel of the rasterized relief image by applying a filter operation by means of a convex kernel; c) subtracting the determined low spatial frequency height component from the height value of a pixel of the rasterized relief image resulting in a reduced height value; and d) printing the rasterized relief image by using the reduced height value, wherein the step of determining the low spatial frequency height component comprises the sub-steps of; b1) moving the convex kernel over a plurality of positions in the rasterized relief image; b2) for each position of the plurality of positions, determining a minimum height difference between the image height and the kernel height; and b3) for each position of the plurality of positions, setting the low spatial frequency height component to the minimum height difference determined in step b2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A print system configured to generate relief prints on a substantially flat substrate in a number of passes, wherein palpable differences exist between a height of various parts of the relief print, the print system comprising a print controller and a print engine, the print controller comprising:
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a receiving unit configured to receive a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image; a determining unit configured to determine a low spatial frequency height component in the height channel of a pixel of the rasterized relief image by applying a filter operation by means of a convex kernel; and a subtracting unit configured to subtract the determined low spatial frequency height component from the height of a pixel of the rasterized relief image resulting in a reduced height, wherein the print engine is configured to print the rasterized relief image by taking the reduced height of the pixel into account, and wherein the determining unit is configured to; move the convex kernel over a plurality of positions in the rasterized relief image; for each position of the plurality of positions, determine a minimum height difference between the image height and the kernel height; and for each position of the plurality of positions, set the low spatial frequency height component to the determined minimum height difference.
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Specification