Image processing apparatus capable of high-quality image formation
First Claim
Patent Images
1. An image processing apparatus comprising:
- a first processing unit applying a tone process on input image data; and
a second processing unit determining a size of a dot to be printed from data of a plurality of pixels contained in the image data having been subjected to said tone process, wherein the dot replaces the plurality of pixels in output image data of the second processing unit.
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Abstract
The process described below is performed to output high-quality images without changing the resolution of the printer used.
A binarizing step using such a frequency modulation (FM) technique as error diffusion is performed. at a resolution higher than that which, can be output from the printer. A screen or grid corresponding to the resolution of the printer is superimposed on the binarized data. A size of a dot to be printed by the printer is obtained from the number of dots (or data indicative of a “1”) contained in one square of the screen. Then the diameter of the dot is modulated while an image data is output depending on the resolution of the printer.
41 Citations
37 Claims
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1. An image processing apparatus comprising:
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a first processing unit applying a tone process on input image data; and
a second processing unit determining a size of a dot to be printed from data of a plurality of pixels contained in the image data having been subjected to said tone process, wherein the dot replaces the plurality of pixels in output image data of the second processing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image processing method comprising the steps of:
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applying a tone process on input image data; and
determining a size of a dot to be printed from data of a plurality of pixels contained in the image data having been subjected to said tone process, wherein the dot replaces the plurality of pixels in output image data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for processing an image, comprising the steps of:
- dividing the image including an array of pixels into a plurality of subarrays;
for at least one subarray;determining the density of pixels of a color within the subarray; and
replacing the subarray with a replacement pixel of the color, the replacement pixel having a size determined by the density of pixels of the color within the subarray. - View Dependent Claims (22, 23, 24, 25)
- dividing the image including an array of pixels into a plurality of subarrays;
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26. A printer comprising:
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a processor for processing an image received for printing, wherein the processor divides the image including an array of pixels into a plurality of subarrays and, for at least one subarray;
determines the density of pixels of a color within the subarray; and
replaces the subarray with a replacement pixel of the color, the replacement pixel having a size determined by the density of pixels of the color within the subarray; and
a print head for receiving the image processed by the processor and printing the image processed by the processor onto a medium. - View Dependent Claims (27, 28, 29)
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30. An image processing apparatus comprising:
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a binarizing unit for binarizing image data and thereby generating binarized image data having a first resolution; and
a multi-toning unit for generating multi-tone image data having a second resolution from the binarized image data, the second resolution being lower than the first resolution. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
a resolution converting unit for converting a resolution of the image data, wherein the binarizing unit binarizing the image data that have processed by the resolution converting unit.
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34. An image processing apparatus as claimed in claim 33, wherein the image data processed by the resolution converting unit have the first resolution.
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35. An image processing apparatus as claimed in claim 34, wherein the first resolution is higher than a resolution of an output unit.
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36. An image processing apparatus as claimed in claim 30, wherein the second resolution matches a resolution of an output unit.
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37. An image processing apparatus as claimed in claim 30, wherein the multi-toning unit determines a tone level of each pixel of the multi-tone image data by referring a plurality of pixels of the binarized image data.
Specification