Image processing apparatus, image processing method, and storage medium for color separation and quantization processing
AssigneeCanon Kabushiki Kaisha
InventorHiromitsu Nishikawa
Life of this patent
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Abstract
An image processing apparatus of the embodiments includes: an input unit configured to input a hue signal representing a hue of an image and an image quality signal representing a texture of the image; a conversion unit configured to convert the image quality signal into a physical quantity signal indicating at least one physical quantity of a refractive index of a color material, surface roughness of an image, an area ratio of dots on an image surface, and a layer thickness of a color material in an image corresponding to the image quality signal; and a dot arrangement determination unit configured to determine a color material dot arrangement for outputting the image based on the hue signal and the physical quantity signal.
Claims12
An image processing apparatus comprising:
- at least one processor;
- a memory coupled with the at least one processor and having stored thereon instructions that, when executed by the at least one processor, cause the image processing apparatus to:
- input a hue signal representing a hue of an image and an image quality signal representing a texture of the image;
- convert the image quality signal into a physical quantity signal indicating at least a refractive index of a color material corresponding to the image quality signal;
- and
- determine a color material dot arrangement for outputting the image by using either quantization method of reproducing an image having blue noise characteristics exhibiting high dispersibility or quantization method of reproducing an image having green noise characteristics exhibiting low dispersibility based on the hue signal and the physical quantity signal,
- wherein the quantization method of reproducing an image having blue noise characteristics is used in a case where the refractive index is high, and the quantization method of reproducing an image having green noise characteristics is used in a case where the refractive index is low.
An image processing method comprising the steps of:
- inputting a hue signal representing a hue of an image and an image quality signal representing a texture of the image;
- converting the image quality signal into a physical quantity signal indicating at least a refractive index of a color material corresponding to the image quality signal;
- and
- determining a color material dot arrangement for outputting the image by using either quantization method of reproducing an image having blue noise characteristics exhibiting high dispersibility or quantization method of reproducing an image having green noise characteristics exhibiting low dispersibility based on the hue signal and the physical quantity signal,
- wherein the quantization method of reproducing an image having blue noise characteristics is used in a case where the refractive index is high, and the quantization method of reproducing an image having green noise characteristics is used in a case where the refractive index is low.
A non-transitory computer readable storage medium storing a program for causing a computer to function as an image processing apparatus, which comprises at least one processor and a memory having stored thereon instructions that, when executed by the at least one processor, cause the image processing apparatus to:
- input a hue signal representing a hue of an image and an image quality signal representing a texture of the image;
- convert the image quality signal into a physical quantity signal indicating at least a refractive index of a color material corresponding to the image quality signal;
- and
- determine a color material dot arrangement for outputting the image by using either quantization method of reproducing an image having blue noise characteristics exhibiting high dispersibility or quantization method of reproducing an image having green noise characteristics exhibiting low dispersibility based on the hue signal and the physical quantity signal,
- wherein the quantization method of reproducing an image having blue noise characteristics is used in a case where the refractive index is high, and the quantization method of reproducing an image having green noise characteristics is used in a case where the refractive index is low.
Dependencies are inferred from the claim text.