Image processing apparatus, method, computer program product, and image forming apparatus, detecting a halftone area based on a rearranged halftone dot detection result
AssigneeRicoh Company, Ltd.
InventorTaira Matsuoka
Life of this patent
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Abstract
A halftone pixel detection unit detects pixels near center pixels of halftone pixels by comparing a density difference between a target pixel and each of neighboring pixels of image data with a predetermined threshold. A halftone pixel rearranging unit rearranges the halftone pixels detected by the halftone pixel detection unit relative to the target pixel and a halftone-area detection unit detects a halftone area based upon a pattern of the halftone pixels that is rearranged.
Claims10
An image processing apparatus comprising:
- a receiving unit that receives image data;
- a halftone-dot pixel detection unit that, for each pixel in the image data, detects halftone-dot pixels of a halftone dot as a halftone dot detection result by comparing a density difference between a target pixel and a neighboring pixel group with a predetermined threshold;
- a halftone-dot pixel rearranging unit that rearranges the halftone dot detection result near the target pixel;
- and
- a halftone-area detection unit that detects a halftone area based on the halftone dot detection result rearranged by the halftone-dot pixel rearranging unit.
An image processing method performed by an image processing apparatus, comprising:
- receiving image data;
- detecting, for each pixel in the image data, halftone-dot pixels of a halftone dot as a halftone dot detection result by comparing a density difference between a target pixel and a neighboring pixel group with a predetermined threshold;
- rearranging the halftone dot detection result near the target pixel;
- and
- detecting a halftone area based on the halftone dot detection result rearranged at the rearranging.
A computer program product that includes a computer program stored on a non-transitory computer-readable recording medium which when executed on a computer causes the computer to execute:
- receiving image data;
- detecting, for each pixel in the image data, halftone-dot pixels of a halftone dot as a halftone dot detection result by comparing a density difference between a target pixel and a neighboring pixel group with a predetermined threshold;
- rearranging the halftone dot detection result near the target pixel;
- and
- detecting a halftone area based on the halftone dot detection result rearranged at the rearranging.
Dependencies are inferred from the claim text.