Patent EP0673155A2 successfully refreshed from Google Patents.
EP0673155A2
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Data correction subsystem and method for image processing
Assignee: Seiko Epson Corp
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Filing: 1995-03-14
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Granted: —
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Expires: 2015-03-14
Abstract
Abstract A data correction subsystem (3) for a colour image processing system having a colour image reading device (1) and a colour image printing device (5). A chart file (31) is transmitted to the printing device so that the printing device produces a sample chart (51). Calibration data (37) is calculated from read sample data so that the read sample data can be corrected to corresponding data in the chart file. The read sample data is obtained by causing the reading device to read the sample chart. Printing data to be transmitted to the printing device is correcting using the calibration data.
Inventors
- 👤 Hironobu C/O Seiko Epson Corporation Tadenuma
- 👤 Shuichi C/O Seiko Epson Corporation Ichinose
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:06
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A data correction subsystem for an image processing system having an image reading device and an image printing device, the data correction subsystem being characterised by comprising: transmitting means for transmitting a chart file to the printing device so that the printing device produces a sample chart; calibration data calculation means for calculating calibration data from read sample data so that the read sample data can be corrected to corresponding data in the chart file, the read sample data being obtained by causing the reading device to read the sample chart; and calibration means for correcting printing data transmitted to the printing device using the calibration data.
Claim 2
Dependent Claim
102 words
A data correction subsystem according to claim 1 wherein the read sample data is first image data being produced by the image reading device upon a reading of the sample chart by the image reading device; the calibration data calculation means calculating calibration data in accordance with the comparison of the first image data with the chart file; and further comprising means for transmitting the calibration data to the image reading device so that second image data produced by the image reading device upon a reading of an image by the image reading device is corrected in accordance with the calibration data.
Claim 3
Dependent Claim
34 words
A data correction subsystem according to claim 1 or claim 2 wherein the image processing system is a colour image processing system having a colour image reading device and a colour image printing device.
Claim 4
Dependent Claim
56 words
A data correction subsystem according to claim 3, wherein the calibration data includes γ calibration data for correcting grey density and colour calibration data for correcting a colour, and the calibration means subjects the printing data first to grey density correction using the γ calibration data and then to colour correction using the colour calibration data.
Claim 5
Dependent Claim
30 words
A data correction subsystem according to claim 4, wherein the colour calibration data is a 3x3 matrix filter by which three primary colour components of the printing data are multiplied.
Claim 6
Dependent Claim
90 words
A data correction subsystem according to any preceding claim, wherein a plurality of different types of printing devices can be used selectively or concurrently as the printing device, and wherein the data correction subsystem further comprises: calibration data storing means for storing calibration data calculated respectively for each of the plurality of types of Drinting devices; and calibration data selection means for selecting calibration data for a type of printing device to be used from the stored calibration data and for supplying the selected calibration data to the calibration means.
Claim 7
Dependent Claim
99 words
A data correction subsystem according to any preceding claim, wherein the calibration data includes γ calibration data for correcting a grey density, and wherein the calibration data calculation means comprises: grey density normalisation means for subjecting the read sample data to normalisation processing to expand a grey density distribution region of the read sample data toward a higher density side; and conversion data calculation means for calculating conversion data for correcting a grey density of the normalised read sample data to a grey density of the chart file data and making the calculated conversion data the γ calibration data.
Claim 8
Dependent Claim
110 words
A data correction subsystem according to any preceding claim, wherein the calibration data includes γ calibration data for correcting a grey density, and wherein the calibration data calculation means comprises: density change detection means for detecting a point of change in a density value by scanning grey density values of the read sample data in a single direction; and conversion data preparation means for preparing conversion data for converting the grey density value of the read sample data at the detected point of change into a grey density value of the chart file data corresponding to the point of change and making the prepared conversion data the γ calibration data.
Claim 9
Dependent Claim
107 words
A data correction subsystem according to any one of claims 3 to 5, wherein the calibration data includes colour calibration data for correcting a colour, and wherein the calibration data calculation means comprises: colour sampling means for sampling only colour data in the chart file from the read sample data, the colour data corresponding to a predetermined colour within a range of colours that can be output by the printing device; and conversion data calculation means for calculating conversion data for correcting the colour data sampled from the read sample data to corresponding data in the chart file and making the conversion data the colour calibration data.
Claim 10
Dependent Claim
109 words
A data correction subsystem according to any one of claims 3 to 5 or 9, wherein the calibration data includes colour calibration data for correcting a colour, and wherein the calibration data calculation means comprises: colour sampling means for sampling only colour data in the chart file from the read sample data, the colour data corresponding to a predetermined colour outside a range of colours that can be output by the printing device; and conversion data calculation means for calculating conversion data for correcting the colour data sampled from the read sample data to corresponding data in the chart file and making the conversion data the colour calibration data.
Claim 11
Dependent Claim
111 words
A data correction subsystem according to any one of claims 3 to 5, 9 or 10, wherein the calibration data includes colour calibration data for correcting a colour, and wherein the calibration data calculation means comprises: matrix filter calculation means for calculating a 3x3 matrix filter to minimise an error between three primary colour component values of the read sample data and three primary colour component values of the chart file data; and matrix normalisation means for executing normalisation processing to make lightness components with respect to the three primary colours of the calculated matrix filter equal to one another and making the thus normalised matrix filter the colour calibration data.
Claim 12
Dependent Claim
94 words
A data correction method for an image processing system having an image reading device and an image printing device, comprising the steps of: transmitting a chart file to the printing device so that the printing device produces a sample chart; calculating calibration data from read sample data so that the read sample data can be corrected to corresponding data in the chart file, the read sample data being obtained by causing the reading device to read the sample chart; and correcting printing data to be transmitted to the printing device using the calibration data.
Claim 13
Dependent Claim
98 words
A data correction method according to claim 12, wherein the read sample data is first image data being produced by the image reading device upon a reading of the sample chart by the image reading device; and comprising the steps of: calculating calibration data in accordance with the comparison of the first image data with the chart file; and transmitting the calibration data to the image reading device so that second image data produced by the image reading device upon a reading of an image by the image reading device is corrected in accordance with the calibration data.
Claim 14
Dependent Claim
34 words
A data correction method according to claim 12 or claim 13, wherein the image processing system is a colour image processing system having a colour image reading device and a colour image printing device.
Claim 15
Dependent Claim
95 words
An image processing system, comprising: an image reading device; an image printing device; transmitting means for transmitting a chart file to the printing device so that the printing device produces a sample chart; calibration data calculation means for calculating calibration data from read sample data so that the read sample data can be corrected to corresponding data in the chart file, the read sample data being obtained by causing the reading device to read the sample chart; and calibration means for correcting printing data to be transmitted to the printing device using the calibration data.
Claim 16
Dependent Claim
129 words
An image processing system according to claim 15 and comprising: a data correction subsystem, the data correction subsystem including said transmitting means; said calibration data calculation means comprising; means for comparing first image data with the chart file, the first image data being produced by the image reading device upon a reading of the sample chart by the image reading device, and means for calculating calibration data in accordance with the comparison of the first image data with the chart file, and the data correction subsystem also including; means for transmitting the calibration data to the image reading device so that second image data produced by the image reading device upon a reading of an image by the image reading device is corrected in accordance with the calibration data.
Claim 17
Dependent Claim
46 words
An image processing system according to claim 15 or claim 16, wherein the image reading device comprises a calibration data storage means for storing the calibration data obtained by the calibration data calculation means, and wherein the calibration means is provided in the image reading device.
Claim 18
Dependent Claim
34 words
Am image processing system according to any one of claims 15 to 17, wherein said system is a colour image processing system comprising a colour image reading device and a colour image printing device.
Claim 19
Dependent Claim
73 words
An image processing method comprising the steps of: printing a sample chart in accordance with a chart file; reading the chart file to produce first image data; comparing the first image data with the chart file; calculating calibration data in accordance with the comparison of the first image data with the chart file; reading an image to produce second image data; and correcting the second image data in accordance with the calibration data.
Claim 20
Dependent Claim
75 words
An image processing method according to claim 19, wherein the step of calculating the calibration data includes the steps of calculating γ calibration data and calculating colour calibration data, and wherein the step of correcting the second image data includes the steps of correcting a grey density of the second image data in accordance with the γ calibration data and correcting a colour of the second image data in accordance with the colour calibration data.
Claim 21
Dependent Claim
66 words
An image processing method according to claim 19 or claim 20, wherein the printing step, the first reading step, the comparing step, and the calculating step are performed a plurality of times to produce calibration data for a plurality of corresponding printing devices, and wherein the method further comprises the step of storing the calibration data for at least one of the plurality of printing devices.
References Cited (Backward Citations)
US4929978A
Cited
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