Converting image data resolution using different coefficients depending on whether a target pixel constitutes a predetermined dot
AssigneeCanon Kabushiki Kaisha
InventorYukihiro Shindo
Life of this patent
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Abstract
An image processing apparatus that converts image data of a first resolution into image data of a second resolution lower than the first resolution. The image processing apparatus determines a small dot that is included in the image data of the first resolution and matches a first small dot pattern and performs conversion from the first resolution to the second resolution by switching a method of generating resolution-converted image data based on a result of the determination.
Claims17
An image processing apparatus for converting image data of a first resolution into image data of a second resolution lower than the first resolution, the image processing apparatus comprising:
- a controller, having at least one processor which executes instructions stored in a memory, one or more circuitry, or, a combination of the at least one processor and the one or more circuitry, being configured to:
- determine whether a target pixel in the image data of the first resolution constitutes a predetermined dot by determining whether an area including the target pixel matches a predetermined dot pattern;
- and
- convert a resolution of the image data from the first resolution to the second resolution by applying first coefficients to pixels of an area including a target pixel determined not to constitute the predetermined dot, and applying second coefficients different from the first coefficients to pixels of an area including a target pixel determined to constitute the predetermined dot.
A method of controlling an image processing apparatus for converting image data of a first resolution into image data of a second resolution lower than the first resolution, the method comprising:
- determining whether a target pixel in the image data of the first resolution constitutes a predetermined dot by determining whether an area including the target pixel matches a predetermined dot pattern;
- and
- converting a resolution of the image data from the first resolution to the second resolution by applying first coefficients to pixels of an area including a target pixel determined not to constitute the predetermined dot, and by applying second coefficients different from the first coefficients to pixels of an area including a target pixel determined to constitute the predetermined dot.
A non-transitory computer readable storage medium storing a program for causing a processor to execute a method of controlling an image processing apparatus for converting image data of a first resolution into image data of a second resolution lower than the first resolution, the method comprising:
- determining whether a target pixel in the image data of the first resolution constitutes a predetermined dot by determining whether an area including the target pixel matches a predetermined dot pattern;
- and
- converting a resolution of the image data from the first resolution to the second resolution by applying first coefficients to pixels of an area including a target pixel determined not to constitute the predetermined dot, and by applying second coefficients different from the first coefficients to pixels of an area including a target pixel determined to constitute the predetermined dot.
Dependencies are inferred from the claim text.