JP2007049443A5

JP2007049443A5 -

Info

Publication number: JP2007049443A5
Application number: JP2005231843A
Authority: JP
Filing date: 2005-08-10
Publication date: 2008-08-28
Anticipated expiration: 2025-08-10

Claims

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
In the dither matrix, all of the plurality of group RMS granularities which are the RMS granularity of the low-frequency component of the group dot pattern formed for each of the plurality of pixel groups can be printed on each other in a common print region. A pixel group configured by being combined, and configured to be smaller than the RMS granularity of the low-frequency component of a dot pattern formed in any pixel group other than the plurality of pixel groups. And a dither matrix.

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
In the dither matrix, a plurality of group dot uniformity, which is uniformity of a dot density distribution of a low frequency component of a group dot pattern formed for each of the plurality of pixel groups, is used to print the print image in a common print area The pixel groups are configured by being combined with each other, and configured to be higher than the uniformity of the dot density distribution of the low-frequency component of the dot pattern formed in any pixel group other than the plurality of pixel groups. A dither matrix, characterized in that

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
The dither matrix is a plurality of graininess evaluation values calculated based on a value obtained by subjecting a group dot pattern formed for each of the plurality of pixel groups to a Fourier transform process and a visual spatial frequency characteristic function Each of the group granularity evaluation values is a pixel group configured by combining the print images with each other in a common print region, and is formed in any pixel group other than the plurality of pixel groups. The dither matrix is configured to be smaller than the graininess evaluation value.

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
In the dither matrix, all of the plurality of group RMS granularities, which are the RMS granularity of the low frequency component of the group dot pattern formed for each of the plurality of pixel groups, are formed on all the pixels constituting the print image. The dither matrix more than any of the plurality of group RMS granularities in a virtual dither matrix configured such that an overall RMS granularity that is an RMS granularity of the low-frequency component of the entire dot pattern is smaller than the dither matrix A dither matrix, characterized in that the dither matrix is configured to be close to the overall RMS granularity.

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
In the dither matrix, all of the plurality of group dot uniformity, which is the uniformity of the dot density distribution of the low frequency component of the group dot pattern formed for each of the plurality of pixel groups, constitutes the print image. The plurality of group dot uniformity in the virtual dither matrix configured so that the overall dot uniformity, which is the uniformity of the dot density distribution of the low frequency component of the overall dot pattern formed in the above, is higher than the dither matrix. The dither matrix is configured so as to be closer to the overall dot uniformity of the dither matrix than any of them.

A dither matrix for determining a dot formation state on each print pixel of a print image to be formed on a print medium by performing halftone processing on input image data,
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in the formation of the dots in a common print region,
The dither matrix is a plurality of graininess evaluation values calculated based on a value obtained by subjecting a group dot pattern formed for each of the plurality of pixel groups to a Fourier transform process and a visual spatial frequency characteristic function Each of the group dot granularity evaluation values is such that the overall granularity evaluation value, which is the granularity evaluation value of the entire dot pattern formed on all the pixels constituting the print image, is smaller than the dither matrix. The dither matrix configured to be closer to the overall granularity evaluation value of the dither matrix than any of the plurality of group granularity evaluation values in the configured virtual dither matrix.

A printing device for printing on a print medium,
A halftone process is performed on the image data representing the gradation value of each pixel constituting the original image, thereby determining a dot formation state on each print pixel of the print image to be formed on the print medium. A dot data generation unit that generates dot data representing the determined dot formation state, and
According to the dot data, a print image generation unit that generates a print image by forming dots in the print pixels;
With
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in a common print region in the formation of dots by the print image generation unit,
The printing apparatus according to claim 1 , wherein the halftone process is configured to determine a dot formation state on each print pixel using the dither matrix according to claim 1. .

A printing method for printing on a print medium,
A halftone process is performed on the image data representing the gradation value of each pixel constituting the original image, thereby determining a dot formation state on each print pixel of the print image to be formed on the print medium. And a dot data generation step for generating dot data representing the determined dot formation state;
In accordance with the dot data, a print image generation step for generating a print image by forming dots in the respective print pixels;
With
The print image is formed by combining print pixels belonging to each of a plurality of pixel groups assumed to be physically different in a common print region in the formation of dots by the print image generation unit,
7. The printing method according to claim 1 , wherein the halftone processing is configured to determine a dot formation state on each of the printing pixels using the dither matrix according to any one of claims 1 to 6. .