Image processing apparatus, image forming apparatus and image processing method
AssigneeMinolta Co., Ltd.
InventorTomohiro Yamaguchi
Life of this patent
Estimating the term…
Abstract
Disclosed is an image processing apparatus including an enhancement amount calculation unit for calculating a density enhancement amount for each edge pixel, which is a pixel in an edge area of an image, an enhancement amount increasing unit for increasing the density enhancement amount for each edge pixel in a manner to reduce variations in the enhancement amounts in the overall edge area, a density increasing unit for increasing the density of each edge pixel in a manner to reduce variations in density in the overall edge area, and an adder for adding the increased density inputted from the density increasing unit and the increased density enhancement amount inputted from the enhancement amount increasing unit, and for outputting the addition result.
Claims9
An image processing apparatus for conducting edge enhancement processing on an original image, comprising:
- an enhancement amount calculation unit for calculating a density enhancement amount for each edge pixel of the original image, the edge pixel being a pixel in an edge area in the image;
- an enhancement amount processing unit for correcting the density enhancement amount for each edge pixel in a manner to reduce variations in the density enhancement amounts in the overall edge area;
- a density processing unit for correcting a density of each edge pixel of the original image in a manner to reduce variations in densities in the overall edge area;
- and
- a density calculation unit for calculating an enhanced density of each edge pixel from the corrected density and the corrected density enhancement amount.
An image processing apparatus for conducting edge enhancement processing on image data, comprising:
- a judgment unit for judging whether a target pixel is an edge pixel which is in an edge area, based on the image data;
- an enhancement amount calculation unit for calculating first data expressing an edge enhancement amount for the target pixel based on the image data;
- a first processing unit for changing a value of the first data for the target pixel to a greatest value among first data of a) the target pixel and b) a plurality of pixels surrounding the target pixel;
- a second processing unit for changing a value of the image data of the target pixel to a greatest value among image data of a) the target pixel and b) a plurality of pixels surrounding the target pixel;
- and
- an addition unit for adding the changed first data to the changed image data of the target pixel that is judged to be an edge pixel by the judgment unit, and for outputting the resulting data.
An image processing method for conducting edge enhancement processing on an original image, the method comprising steps of:
- calculating a density enhancement amount for each edge pixel of the original image, the edge pixel being a pixel in an edge area in the image;
- increasing the density enhancement amount for each edge pixel in a manner to reduce variations in the density enhancement amounts in the overall edge area;
- increasing density of each edge pixel of the original image in a manner to reduce variations in densities in the overall edge area;
- and
- calculating enhanced density of each edge pixel by adding the increased density enhancement amount to the increased density.
Dependencies are inferred from the claim text.