Patent US5364547A successfully refreshed from Google Patents.
EP0223601A2
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Image processing method
Assignee: Sharp Corp
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Filing: 1986-11-18
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Granted: —
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Expires: 2006-11-18
Abstract
Abstract In an image processing apparatus or method for expressing a halftone-including original image with binary black-and-white pixels and reproducing the original image in the form of a binary-coded output, the feature of the present invention resides in detecting, relative to each of the pixel units obtained by scanning and sampling the original image, a first average density level representative of the average density level of the pixel unit within a first specific reference pixel region composed of pixel unit groups adjacent to the subject pixel unit leftward and rightward, then detecting a second average density level representative of the average density level of the pixel unit within a second specific reference pixel region composed of a pixel unit group adjacent to the first specific reference pixel region upward, and detecting the density level of the subject pixel unit in accordance with the first and second average density levels, thereby enabling correction of the gradation.
Inventors
- 👤 Matahira Kotani
- 👤 Motohiko Hayashi
- 👤 Masafumi Yamanoue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:13
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; H; H04; H04N; H04N1/00; H04N1/40; H04N1/403; H04N1/409
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
An image processing method for expressing a halftone-including original image with binary black-and-white pixels and reproducing the original image in the form of a binary-coded output, said method comprising the steps of: detecting, relative to. each of the pixel units obtained by scanning and sampling the original image, a first average density level representative of the average density level of the pixel unit within a first specific reference pixel region composed of pixel unit groups adjacent to the subject pixel unit leftward and rightward; detecting a second average density level representative of the average density level of the pixel unit within a second specific reference pixel region composed of a pixel unit group adjacent to said first specific reference pixel region upward; and deciding the density level of said subject pixel unit in accordance with said first and second average density levels, thereby enabling correction of the gradation.
Claim 2
Dependent Claim
148 words
An image processing method for expressing a halftone-including original image with binary black-and-white pixels and reproducing the original image in the form of a binary-coded output, said method comprising the steps of: detecting, relative to. each of the pixel units obtained by scanning and sampling the original image, a first average density level representative of the average density level of the pixel unit within a first specific reference pixel region composed of pixel unit groups adjacent to the subject pixel unit leftward and rightward; detecting a second average density level representative of the average density level of the pixel unit within a second specific reference pixel region composed of a pixel unit group adjacent to said first specific reference pixel region upward; and deciding the density level of said subject pixel unit in accordance with said first and second average density levels, thereby enabling correction of the gradation.
Claim 3
Dependent Claim
148 words
An image processing apparatus for expressing a halftone-including original image with binary black-and-white pixels and reproducing the original image in the form of a binary-coded output, said apparatus comprising: a means for detecting, relative to each of the pixel units obtained by scanning and sampling the original image, a first average density level representative of the average density level of the pixel unit within a first specific reference pixel region composed of pixel unit groups adjacent to the subject pixel unit leftward and rightward; a means for detecting a second average density level representative of the average density level of the pixel unit within a second specific reference pixel region composed of a pixel unit group adjacent to said first specific reference pixel region upward; and a means for deciding the density level of said subject pixel unit in accordance with said first and second average density levels.
Claim 4
Dependent Claim
148 words
An image processing apparatus for expressing a halftone-including original image with binary black-and-white pixels and reproducing the original image in the form of a binary-coded output, said apparatus comprising: a means for detecting, relative to each of the pixel units obtained by scanning and sampling the original image, a first average density level representative of the average density level of the pixel unit within a first specific reference pixel region composed of pixel unit groups adjacent to the subject pixel unit leftward and rightward; a means for detecting a second average density level representative of the average density level of the pixel unit within a second specific reference pixel region composed of a pixel unit group adjacent to said first specific reference pixel region upward; and a means for deciding the density level of said subject pixel unit in accordance with said first and second average density levels.
Claim 5
Dependent Claim
103 words
An image processing method or system for digitalizing an original image, wherein said image is split into a two-dimensional matrix-of picture elements, or pixels for each of which an initial image value is produced, and wherein a digital value for each pixel is obtained by a procedure which for the purpose of improving image gradation involves averaging of the image values for the pixels in a region of the image which includes the pixel in question and which extends in orthogonal directions from that pixel by fixed distances, the averaged value thus derived being employed when producing the digital value for said pixel.
Claim 6
Dependent Claim
103 words
An image processing method or system for digitalizing an original image, wherein said image is split into a two-dimensional matrix-of picture elements, or pixels for each of which an initial image value is produced, and wherein a digital value for each pixel is obtained by a procedure which for the purpose of improving image gradation involves averaging of the image values for the pixels in a region of the image which includes the pixel in question and which extends in orthogonal directions from that pixel by fixed distances, the averaged value thus derived being employed when producing the digital value for said pixel.
References Cited (Backward Citations)
JPS56109069A
Cited
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