Light scattering property measurement method
AssigneeCanon Kabushiki Kaisha
InventorsStephen James Hardy, DeQiang Eugene Cai
Life of this patent
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Abstract
Methods (300, 1000) of determining a light scattering property of a medium (152), are disclosed. The medium (152) is illuminated through a test pattern (e.g., 155, 510), the test pattern (155, 510) comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale. The test pattern (300, 1000) further comprises at least one other region containing the first pattern at a different scale. The light reflected from the illuminated medium (152) through the test pattern is measured to capture an image of the illuminated medium. A light scattering property of the medium (152) is determined based on the measured light.
Claims22
A method of determining a light scattering property of a medium, said method comprising the steps of
- illuminating the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale, wherein a density of the at least one region is substantially the same as a density of the at least one other region;
- measuring light reflected from the illuminated medium through the test pattern;
- and
- determining a light scattering property of the medium based on the measured light.
An apparatus for determining a light scattering property of a medium, said apparatus comprising:
- illuminating device for illuminating the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale, wherein a density of the at least one region is substantially the same as a density of the at least one other region;
- imaging device for measuring light reflected from the illuminated medium through the test pattern to capture an image of the illuminated medium;
- and
- processor for determining a light scattering property of the medium based on the measured light.
A computer readable medium, having a program recorded on the medium, where the program is configured to make a computer execute a process to determine a light scattering property of a medium, said program comprising:
- code for illuminating the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale, wherein a density of the at least one region is substantially the same as a density of the at least one other region;
- code for measuring the light reflected from the illuminated medium through the test pattern to capture an image of the illuminated medium;
- and
- code for determining a light scattering property of the medium based on the measured light.
A method of determining a resolution measurement for a printer based on a medium on which the printer prints, said method comprising the steps of
- illuminating an area of the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale;
- measuring light reflected from the illuminated area of the medium through the test pattern;
- determining a light scattering property of the area of the medium based on the measured light;
- printing a second test pattern for determining printer resolution, on a second area of said medium;
- determining resolution of said printer based on an image of said second test pattern;
- and
- correcting the determined resolution for said printer based on said light scattering property.
An apparatus for determining a resolution measurement for a printer based on a medium on which the printer prints, said apparatus comprising:
- means for illuminating an area of the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale;
- means for measuring light reflected from the illuminated area of the medium through the test pattern;
- means for determining a light scattering property of the area of the medium based on the measured light;
- means for printing a second test pattern for determining printer resolution, on a second area of said medium;
- means for determining resolution of said printer based on an image of said second test pattern;
- and
- means for correcting the determined resolution for said printer based on said light scattering property.
A computer readable medium, having a program recorded on the medium, where the program is configured to make a computer execute a process to determine a light scattering property of a medium, said program comprising:
- code for determining a resolution measurement for a printer based on a medium on which the printer prints, said method comprising the steps of
- code for illuminating an area of the medium through a test pattern, the test pattern comprising at least one region containing a first pattern with substantial variation in two orthogonal directions at one scale, the test pattern further comprising at least one other region containing the first pattern at a different scale;
- code for measuring light reflected from the illuminated area of the medium through the test pattern;
- code for determining a light scattering property of the area of the medium based on the measured light;
- code for printing a second test pattern for determining printer resolution on a second area of said medium;
- code for determining resolution of said printer based on an image of said second test pattern;
- and
- code for correcting the determined resolution for said printer based on said light scattering property.
Dependencies are inferred from the claim text.