A color image control system and method are provided for improving the image control of printing systems, including digital front-end processors, color printers and post-finishing system. This automatic image control system, including measurement and calibration, by registering the captured reproduc
A color image control system and method are provided for improving the image control of printing systems, including digital front-end processors, color printers and post-finishing system. This automatic image control system, including measurement and calibration, by registering the captured reproduced document with the extracted virtual device document and automatically locating a plurality of regions in which to measure captured color values, using colorimetric measurements of an aim reproduction of the document at these same region positions, and finally relating the captured color values, the colorimetric color values, and the virtual device color values to create the an accurate color mapping. One embodiment of this method combines a global regression polynomial with local mapping refinement.
대표청구항▼
The invention claimed is: 1. An image control method using a color reproduction device to a reference color space mapping in conjunction with a color image capture device and an original document containing graphics, images and/or text, the method comprising the steps of: a. printing the original d
The invention claimed is: 1. An image control method using a color reproduction device to a reference color space mapping in conjunction with a color image capture device and an original document containing graphics, images and/or text, the method comprising the steps of: a. printing the original document with the color reproduction device to create a reproduced document of the original document; b. extracting an output virtual printing device data to facilitate a calibration process and creating an extracted virtual device document; c. scanning the reproduced document to produce a captured reproduced document with the color image capture device; d. segmenting the extracted virtual device document to create a set of ROI (region of interest); e. registering the captured reproduced document with the extracted virtual device document and locating, in a predetermined or automatic manner, a set of ROI values on both the captured reproduced document and the extracted virtual device document that are in registration in order to measure color values of the captured reproduced document in a set of ROI that are in registration with the extracted virtual device document; f. measuring the captured reproduced document with a colorimetric measurement device at the set of ROI to generate corresponding captured color values; g. relating the captured color values, colorimetric color values, and the extracted virtual device document having the virtual color values to create an accurate reference color space mapping, from the captured color values to the colorimetric color values, using the captured color values and the virtual color values that accurately define the digitized reproduced document based on human perception to quantify the appearance of the document before printing to allow remote verification of the reproduced document before printing. 2. The image control method of claim 1, the relating step further comprising a means of using global regression polynomial to create the accurate reference color space mapping. 3. The image control method of claim 1, further comprising capturing the color values of the captured reproduced document on a pixel basis to create a full resolution virtual color document. 4. The image control method of claim 3, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document to one or more of the following remote proofing devices, including calibrated monitors (soft proof) and proof printers (hard proof), for quality assurance use by remote users. 5. The image control method of claim 3, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a digital printing system for system diagnosis. 6. The image control method of claim 3, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a current digital printing system for process control. 7. The image control method of claim 3, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a current digital printing system to control print artifact tracking including one or more of the following: granularity, mottle, streak, banding, breakdown spots, and background or satellite. 8. A method for calibrating a color reproduction device with high-accuracy using a scanner by creating a scanner color RGB to printer CIELAB mapping using an original document containing one or more of an image, graphics and text, comprising the steps of: a. creating a printed document with a digital printing system and extracting a corresponding printer virtual device document comprising virtual values that represents the original document; b. segmenting the virtual device document to identify one or more region of interest (ROI) to create a virtual device document ROI; c. scanning, the printed document into ROI corresponding to the virtual device document to create a captured reproduced document and segmenting the captured reproduced document into captured ROI so that the captured reproduced document is segmented and each segment has a set of measured scanner RGB color values and one or more captured RGB color values in that segment; d. registering the virtual device document ROI to the printed document; e. measuring the printed document with a colorimetric measurement device at one or more identified captured ROI positions to create measured colorimetric color values; f. relating the set of measured scanner and the captured RGB color values, the measured colorimetric color values (CIELAB or XYZ), and the captured RGB color values to automatically create an accurate color mapping from the scanner color RGB to the measured colorimetric color values (CIELAB or XYZ) by extrapolating between each set of measured scanner RGB color values and the RGB color values to form a continuous range of the RGB color values so that those of measured scanner RGB color values is compared to the captured RGB color values and if there are any new values to be created that is done by interpretation of the continuous range of the RGB color values to fill in missing color values. 9. The image control method of claim 8, the relating step further comprising a global regression polynomial. 10. The image control method of claim 8, further comprising capturing the color values of the captured reproduced document a full resolution virtual color document. 11. The image control method of claim 10, further comprising a transmitting step for transmitting some or all of the color values of the virtual full resolution color document to one or more of the following remote proofing devices, including calibrated monitors (soft proof) and proof printers (hard proof), for quality assurance use by remote users. 12. The image control method of claim 10, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a digital printing system for system diagnosis. 13. The image control method of claim 10, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a current digital printing system for process control. 14. The image control method of claim 10, further comprising a transmitting step for transmitting some or all of the color values of the full resolution virtual color document back to a current digital printing system to control print artifacts.
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이 특허에 인용된 특허 (6)
Smilansky Zeev (Rehovot ILX) Melman Haim Z. (Kfar Saba ILX) Bresler Yoav (Tel Aviv ILX) Litvak Matty J. (Petach Tikva ILX) Kreitman Haim (Kfar Saba ILX) Yad-Shalom Itai (Kfar Saba ILX), Apparatus and method for color calibration.
Ishii, Hiroshi, Image processing apparatus, image processing method, and computer- readable recording medium storing image processing program for generating color tone correction parameter.
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