Patent US3877560A successfully refreshed from Google Patents.
Patent EP0390533A2 successfully refreshed from Google Patents.
EP0390533A2
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Method of reproducing gradations
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1990-03-28
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Granted: —
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Expires: 2010-03-28
Abstract
Abstract A method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on, and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, comprising steps of choosing the fine pixel to become a kernel, sequentially and alternately growing fine pixels adjacent to both sides of the fine pixel of the kernel therearound, and assigning serial ranks according to density of the image signal until all the fine pixels in the unit pixel are turned on at the region in which the image signal has the high density.
Inventors
- 👤 Kenji Shibarara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; H04N1/4058; H04N1/4056
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
A method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, characterised by the steps of: (a) selecting predetermined unit pixels from the reference matrix pattern; (b) choosing fine pixels of kernels at the endmost of each unit pixel thus selected, respectively; (c) turning on each fine pixel of the kernel in predetermined rank according to the density of the image signal; and (d) alternately turning on the fine pixels adjacent to both sides of the fine pixels, which are turned on, in the predetermined ranks according to the density of the image signal as the density of the image signal is increased.
Claim 2
Independent Claim
169 words
A method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, characterised by the steps of: (a) selecting predetermined unit pixels from the reference matrix pattern; (b) choosing fine pixels of kernels at the endmost of each unit pixel thus selected, respectively; (c) turning on each fine pixel of the kernel in predetermined rank according to the density of the image signal; and (d) alternately turning on the fine pixels adjacent to both sides of the fine pixels, which are turned on, in the predetermined ranks according to the density of the image signal as the density of the image signal is increased.
Claim 3
Dependent Claim
24 words
A method according to Claim 1, wherein the predetermined unit pixels selected from the reference matrix pattern are the fine pixels arranged alternately therein.
Claim 4
Dependent Claim
26 words
A method according to Claim 1, wherein the predetermined ranks to turn on the fine pixels of kernels are distributedly assigned in the reference matrix pattern.
Claim 5
Dependent Claim
46 words
A method according to Claim 1, wherein the predetermined ranks to alternately turn on the fine pixels adjacent to the two sides of the fine pixels, which are turned on, according to the density of the image signal are distributedly assigned in the reference matrix pattern.
Claim 6
Independent Claim
159 words
A method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, characterised by the steps of: (a) distributedly assigning ranks to turn on the fine pixels within the reference matrix pattern at the region in which the image signal has low density; and (b) assigning the serial ranks according to the density of the image signal to the fine pixels in predetermined unit pixels within the reference matrix pattern until all the fine pixels in the unit pixels are turned on at the region in which the image signal has the high density.
Claim 7
Independent Claim
159 words
A method of reproducing gradations wherein a reference matrix pattern is configured by arranging a plurality of unit pixels like a matrix, each unit pixel is formed with a predetermined plurality of fine pixels, the fine pixels in number according to the gradations of an image signal are turned on and the gradations are reproduced in accordance with the ratio of the fine pixels turned on to the fine pixels turned off in the reference matrix pattern, characterised by the steps of: (a) distributedly assigning ranks to turn on the fine pixels within the reference matrix pattern at the region in which the image signal has low density; and (b) assigning the serial ranks according to the density of the image signal to the fine pixels in predetermined unit pixels within the reference matrix pattern until all the fine pixels in the unit pixels are turned on at the region in which the image signal has the high density.
Claim 8
Dependent Claim
60 words
A method according to Claim 5, wherein, in step (b), the serial ranks according to the density of the image signal are assigned to the fine pixels in all the unit pixels within the reference matrix pattern until all the fine pixels in the unit pixels are turned on at the region in which the image signal has high density.
References Cited (Backward Citations)
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