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US 5,710,871 AGranted
Data correction subsystem and method for color image processing system
AssigneeSeiko Epson Corporation
InventorsHironobu Tadenuma, Shuichi Ichinose
Life of this patent
Estimating the term…
Abstract
A data correction subsystem for a color image processing system having a color image reading device and a color image printing device. A chart file is transmitted to the printing device so that the printing device produces a sample chart. Calibration data 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 corrected using the calibration data.
Claims18
A data correction subsystem for a color image processing system having a color image reading device and a color image printing device, the data correction subsystem comprising:
- transmitting means for transmitting a chart file to the printing device so that the printing device produces a sample chart;
- calculation means for calculating .gamma. and color 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, the calculation means including gray density normalization means for subjecting the read sample data to normalization processing to expand a gray density distribution region of the read sample data toward a higher density side;
- and
- calibration means for correcting printing data to be transmitted to the printing device using the .gamma. and color calibration data.
1 more element
A data correction subsystem for a color image processing system having a color image reading device and a color image printing device, the data correction subsystem, 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 to be transmitted to the printing device using the calibration data;
- wherein the calibration data includes .gamma. calibration data for correcting a gray density, and wherein the calibration data calculation means comprises:
- gray density normalization means for subjecting the read sample data to normalization processing to expand a gray 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 gray density of the normalized read sample data to a gray density of the chart file data and making the calculated conversion data the .gamma. calibration data.
5 more elements
A data correction subsystem for a color image processing system having a color image reading device and a color image printing device, the data correction subsystem, 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 to be transmitted to the printing device using the calibration data;
- wherein the calibration data includes .gamma. calibration data for correcting a gray 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 gray density values of the read sample data in a single direction;
- and
- conversion data preparation means for preparing conversion data for converting the gray density value of the read sample data at the detected point of change into a gray density value of the chart file data corresponding to the point of change and making the prepared conversion data the .gamma. calibration data.
5 more elements
A data correction subsystem for a color image processing system having a color image reading device and a color image printing device, the data correction subsystem, 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 to be transmitted to the printing device using the calibration data:
- wherein the calibration dam includes color calibration data for correcting a color, and wherein the calibration data calculation means comprises:
- matrix filter calculation means for calculating a 3.times.3 matrix filter to minimize an error between three primary color component values of the read sample data and three primary color component values of the chart file data;
- and
- matrix normalization means for executing normalization processing to make lightness components with respect to the three primary colors of the calculated matrix filter equal to one another and making the thus normalized matrix filter the color calibration data.
5 more elements
A data correction method for a color image processing system having a color image reading device and a color image printing device, comprising the steps of:
- transmitting a chart file to the priming device so that the priming device produces a sample chart;
- calculating .gamma. and color 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, the calculating .gamma. and color calibration data including a gray density normalization step for subjecting the read sample data to normalization processing to expand a gray density distribution region of the read sample data toward a higher density side;
- and
- correcting priming data to be transmitted to the printing device using the .gamma. and color calibration data.
1 more element
A color image processing system, comprising:
- a color image reading device;
- a color image printing device;
- transmitting means for transmitting a chart file to the printing device so that the printing device produces a sample chart;
- calculation means for calculating .gamma. and color 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, the calculation means including gray density normalization means for subjecting the read sample data to normalization processing to expand a gray density distribution region of the read sample data toward a higher density side;
- and
- calibration means for correcting printing data to be transmitted to the printing device using the .gamma. and color calibration data.
3 more elements
A data correction subsystem for an image processing system having an image reading device and an image printing device, the data correction subsystem comprising:
- means for transmitting a chart file to the printing device such that the printing device produces a sample chart;
- 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;
- means for calculating .gamma. calibration data for correcting gray density and color calibration data for correcting a color in accordance with the comparison of the first image data with the chart file;
- and
- means for transmitting the .gamma. calibration data and the color 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 .gamma. and color calibration data.
2 more elements
A data correction method for an image processing system having an image reading device and an image printing device, the data correction method comprising the steps of:
- transmitting a chart file to the printing device such that the printing device produces a sample chart;
- 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;
- calculating .gamma. calibration data for correcting gray density and color calibration data for correcting a color in accordance with the comparison of the first image data with the chart file;
- and
- transmitting the .gamma. calibration data and the color 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 .gamma. and color calibration data.
2 more elements
An image processing system, comprising:
- an image reading device;
- a color image printing device;
- and
- a data correction subsystem, the data correction subsystem including
- means for transmitting a chart file to the printing device such that the printing device produces a sample chart,
- 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,
- means for calculating .gamma. calibration data for correcting gray density and color calibration data for correcting a color in accordance with the comparison of the first image data with the chart file, the calculation means including gray density normalization means for subjecting the read sample data to normalization processing to expand a gray density distribution region of the read sample data toward a higher density side, and
- means for transmitting the calibration data to 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 .gamma. and color calibration data.
5 more elements
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 .gamma. calibration data for correcting gray density and color calibration data for correcting color in accordance with the comparison of the first image data with the chart file, the calculating .gamma. calibration data including a gray density normalization step for subjecting the first image data to normalization processing to expand a gray density distribution region of the read sample data toward a higher density side;
- transmitting the .gamma. calibration data and the color calibration data to correct image data;
- reading an image to produce second image data;
- and
- correcting the second image data in accordance with the .gamma. and color calibration data.
5 more elements
Dependencies are inferred from the claim text.