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US 2021/0352189 A1Published application
Powers of lasers to print colors of security pixels
AssigneeHewlett-Packard Development Company, L.P.
InventorsMark Q. Shaw, Kyeongman Kim, Jung Tag Gong
Life of this patent
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Abstract
An example of a computer-readable medium storing machine-readable instructions. When executed, the machine-readable instructions may cause a processor to control a laser to print a test pattern. The test pattern may be scanned to determine visibility of pixels. The power of a laser may be adjusted based on the visibilities to print a security pixel.
Claims15
A computer-readable medium to store machine-readable instructions that, when executed by a processor, cause the processor to:
- control a laser to print a test pattern, the test pattern comprising:
- a first test pixel to be printed using a first test power of the laser with a first color;
- a second test pixel to be printed using a second test power of the laser with the first color;
- a third test pixel to be printed using a third test power of the laser with a second color;
- and
- a fourth test pixel to be printed using a fourth test power of the laser with the second color;
- scan the test pattern to determine a first visibility of the first test pixel, a second visibility of the second test pixel, a third visibility of the third test pixel, and a fourth visibility of the fourth test pixel;
- and
- adjust the laser to use a first security power to print the first color of a security pixel, the first security power selected based on the first visibility and the second visibility, wherein the first color is different than the second color, the first test power is different than the second test power, and the third test power is different than the fourth test power.
6 more elements
A computer-readable medium to store machine-readable instructions that, when executed by a processor, cause the processor to:
- print a test pattern, the test pattern including:
- a first color pattern including a first test pixel to be printed with a first test power of the laser and a first color, a second test pixel to be printed with a second test power of the laser and the first color, and a first background to be printed with the first color;
- and
- a second color pattern including a third test pixel to be printed with a third test power of the laser and a second color, a fourth test pixel to be printed with a fourth test power of the laser and the second color, and a second background to be printed with the second color;
- scan the test pattern to determine a first visibility of the first test pixel against the first background, a second visibility of the second test pixel against the first background, a third visibility of the third test pixel against the second background, and a fourth visibility of the fourth test pixel against the second background;
- calculate a first security power of the laser based on the first visibility and the second visibility;
- calculate a second security power of the laser based on the third visibility and the fourth visibility;
- print a first security pixel with the first security power of the laser and the first color;
- and
- print a second security pixel with the second security power of the laser and the second color, wherein the first color is different than the second color, the first test power is different than the second test power, and the third test power is different than the fourth test power.
7 more elements
A method comprising:
- printing a first test pixel using a first test power of a laser and a first color;
- printing a second test pixel using a second test power of the laser and the first color;
- printing a third test pixel using a third test power of the laser and a second color;
- printing a fourth test pixel using a fourth test power of the laser and the second color;
- scanning the first test pixel to determine a first visibility of the first test pixel;
- scanning the second test pixel to determine a second visibility of the second test pixel;
- scanning the third test pixel to determine a third visibility of the third test pixel;
- scanning the fourth test pixel to determine a fourth visibility of the fourth test pixel;
- calculating a first security power of the laser based on the first visibility and the second visibility;
- calculating a second security power of the laser based on the third visibility and the fourth visibility;
- and
- printing a security pixel using the first security power of the laser and the first color and using the second security power of the laser and the second color, wherein the first color is different than the second color, the first test power is different than the second test power, and the third test power is different than the fourth test power.
9 more elements
Dependencies are inferred from the claim text.