EP0786896A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for converting image data
Assignee: Dainippon Screen Manufacturing Co Ltd
•
Filing: 1997-01-23
•
Granted: —
•
Expires: 2017-01-23
Abstract
Abstract Original image data are converted to device-independent image data expressed in a device-independent color space. The device-independent image data are re-converted to device-dependent image data expressed in a device-dependent color space used in an output device. Then, a specific sharpness enhancing process is carried out for the device-dependent image data, so as to generate output image data while the specific sharpness enhancing process is made equivalent to another sharpness enhancing process executed when a target output image is generated. This sharpness of the output image with a predetermined output device substantially agrees with that of the target output image. The method significantly improves the degree of matching in image reproduction between two different output images.
Inventors
- 👤 Yasuhito Dainippon Screen Mfg. Co. Ltd Shiraishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:52
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/58; H04N1/60; H04N1/603; H04N1/6052
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A method of attaining matching between an output image reproduced from an output image data with an output device and a target output image reproduced from original image data, said method comprising the steps of: (a) converting said original image data to device-independent image data expressed in a device-independent color space; (b) converting said device-independent image data to device-dependent image data expressed in a device-dependent color space applied for said output device; and (c) executing sharpness enhancement process on said device-dependent image data to generate said output image data such that said sharpness enhancement process becomes equivalent to another sharpness enhancement process executed when said target output image was reproduced.
Claim 2
Dependent Claim
46 words
A method in accordance with claim 1, wherein said step (c) comprises the step of adjusting at least one of sharpness enhancement parameters including a size of an averaging mask used in obtaining an unsharp signal, and a gain used in obtaining an unsharp mask signal.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1, wherein said output image is a color image on a display screen, and said target output image is a color print.
Claim 4
Dependent Claim
24 words
A method in accordance with claim 1, wherein said output image is a color proof, and said target output image is a color print.
Claim 5
Independent Claim
115 words
An apparatus for attaining matching between an output image reproduced from an output image data with an output device and a target output image reproduced from original image data, said apparatus comprising: conversion means for converting said original image data to device-independent image data expressed in a device-independent color space; inverse conversion means for converting said device-independent image data to device-dependent image data expressed in a device-dependent color space applied for said output device; and sharpness enhancing means for executing sharpness enhancement process on said device-dependent image data to generate said output image data such that said sharpness enhancement process becomes equivalent to another sharpness enhancement process executed when said target output image was reproduced.
Claim 6
Dependent Claim
46 words
An apparatus in accordance with claim 5, wherein said sharpness enhancing means comprises means for adjusting at least one of sharpness enhancement parameters including a size of an averaging mask used in obtaining an unsharp signal, and a gain used in obtaining an unsharp mask signal.
Claim 7
Dependent Claim
28 words
An apparatus in accordance with claim 5, wherein said output image is a color image on a display screen, and said target output image is a color print.
Claim 8
Dependent Claim
24 words
An apparatus in accordance with claim 5, wherein said output image is a color proof, and said target output image is a color print.
Claim 9
Independent Claim
146 words
A method of attaining matching between first and second output images reproduced from first and second output image data with first and second output devices, respectively, said method comprising the steps of: converting original image data to device-independent image data expressed in a device-independent color space; converting said device-independent image data to first device-dependent image data expressed in a first device-dependent color space applied for said first output device; converting said device-independent image data to second device-dependent image data expressed in a second device-dependent color space applied for said second output device; executing a first sharpness enhancing process on said first device-dependent image data to generate said first output image data; and executing a second sharpness enhancing process on said second device-dependent image data to generate said second output image data such that said second sharpness enhancing process is equivalent to said first sharpness enhancing process,.
Claim 10
Dependent Claim
57 words
A method in accordance with claim 9, further comprising the step of: adjusting at least one of sharpness enhancing parameters used in said second sharpness enhancing process when a sharpness enhancing parameter used in said first sharpness enhancing process is changed such that effects of said first and second sharpness enhancing processes maintain equivalent to each other.
Claim 11
Dependent Claim
35 words
A method in accordance with claim 10, wherein said sharpness enhancement parameters include a size of an averaging mask used in obtaining an unsharp signal, and a gain used in obtaining an unsharp mask signal.
Claim 12
Dependent Claim
29 words
A method in accordance with claim 9, wherein said first output image is a color print, and said second output image is a color image on a display screen.
Claim 13
Dependent Claim
25 words
A method in accordance with claim 9, wherein said first output image is a color print, and said second output image is a color proof.
Claim 14
Independent Claim
166 words
An apparatus for attaining matching between first and second output images reproduced from first and second output image data with first and second output devices, respectively, said apparatus comprising: converting means for converting original image data to device-independent image data expressed in a device-independent color space; first inverse converting means for converting said device-independent image data to first device-dependent image data expressed in a first device-dependent color space applied for said first output device; second inverse converting means for converting said device-independent image data to second device-dependent image data expressed in a second device-dependent color space applied for said second output device; first sharpness enhancing means for executing a first sharpness enhancing process on said first device-dependent image data to generate said first output image data; and second sharpness enhancing means for executing a second sharpness enhancing process for said second device-dependent image data to generate said second output image data such that said second sharpness enhancing process is equivalent to said first sharpness enhancing process,.
Claim 15
Dependent Claim
58 words
An apparatus in accordance with claim 14, further comprising: parameter adjusting means for adjusting at least one of sharpness enhancing parameters used in said second sharpness enhancing means when a sharpness enhancing parameter used in said first sharpness enhancing means is changed such that effects of said first and second sharpness enhancing processes maintain equivalent to each other.
Claim 16
Dependent Claim
35 words
A method in accordance with claim 15, wherein said sharpness enhancement parameters include a size of an averaging mask used in obtaining an unsharp signal, and a gain used in obtaining an unsharp mask signal.
Claim 17
Dependent Claim
29 words
A method in accordance with claim 14, wherein said first output image is a color print, and said second output image is a color image on a display screen.
Claim 18
Dependent Claim
25 words
A method in accordance with claim 14, wherein said first output image is a color print, and said second output image is a color proof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.