Image processing device, printing device, image processing method, and image processing program
First Claim
1. An image processing device for processing image data which indicate an image by a gradation value for each pixel, the image processing device comprising:
- an image data input unit configured to input the image data;
a dot data generator configured to perform processing for generating dot data which indicate the presence or absence of dot formation from the image data; and
a dot data output unit configured to output generated dot data,the dot data generator includingan edge determination unit configured to determine whether a pixel included in the image data is an edge pixel for which the difference in gradation value in relation to an adjacent pixel is equal to or greater than a predetermined value, anda determination value adjustment unit configured to compare a gradation value of the pixel included in the image data to a threshold value of a dither mask prepared in advance, and adjust, using a first value range, a determination value, in the case that the pixel is determined to be the edge pixel by the edge determination unit, the first value range being smaller than a second value range used for adjusting a determination value for a non-edge pixel,the dot data generator performing an error diffusion process of the image data by using the adjusted determination value, and generating the dot data.
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Accused Products
Abstract
Provided is an image processing device for comparing a determination value adjusted by comparing the gradation values of pixels included in inputted image data and threshold values of a dither mask prepared in advance, and a corrected gradation value obtained by correcting the gradation value of the pixel by the diffusion error from an adjacent processed pixel; adjusting a determination value; generating dot data which indicate the presence or absence of the dot formation by applying error diffusion; and reducing the width of the adjustment of the determination value used in determining the dot formation so that the width of the adjustment is smaller in comparison with non-edge pixels in the case that a pixel is determined to be an edge pixel for which the difference in gradation value in relation to an adjacent pixel is equal to or greater than a predetermined value.
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Citations
10 Claims
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1. An image processing device for processing image data which indicate an image by a gradation value for each pixel, the image processing device comprising:
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an image data input unit configured to input the image data; a dot data generator configured to perform processing for generating dot data which indicate the presence or absence of dot formation from the image data; and a dot data output unit configured to output generated dot data, the dot data generator including an edge determination unit configured to determine whether a pixel included in the image data is an edge pixel for which the difference in gradation value in relation to an adjacent pixel is equal to or greater than a predetermined value, and a determination value adjustment unit configured to compare a gradation value of the pixel included in the image data to a threshold value of a dither mask prepared in advance, and adjust, using a first value range, a determination value, in the case that the pixel is determined to be the edge pixel by the edge determination unit, the first value range being smaller than a second value range used for adjusting a determination value for a non-edge pixel, the dot data generator performing an error diffusion process of the image data by using the adjusted determination value, and generating the dot data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processing method for processing image data which indicate an image by a gradation value for each pixel, the image processing method comprising:
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inputting the image data; generating dot data which indicate the presence or absence of dot formation from the image data; and outputting generated dot data, the generating of the dot data including determining whether a pixel included in the image data is an edge pixel for which the difference in gradation value in relation to an adjacent pixel is equal to or greater than a predetermined value, comparing a gradation value of the pixel included in the image data to a threshold value of a dither mask prepared in advance, and adjusting, using a first value range, a determination value, in the case that the pixel is determined to be the edge pixel by the edge determination unit, the first value range being smaller than a second value range used for adjusting a determination value for a non-edge pixel, and performing an error diffusion processing of the image data by using the adjusted determination value and generating the dot data. - View Dependent Claims (10)
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Specification