Patents by Inventor Lai Chee Man
Lai Chee Man has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8014036Abstract: A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g., 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. Although the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.Type: GrantFiled: December 9, 2010Date of Patent: September 6, 2011Assignee: Electronics For Imaging, Inc.Inventor: Lai Chee Man
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Publication number: 20110085209Abstract: A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g., 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. Although the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.Type: ApplicationFiled: December 9, 2010Publication date: April 14, 2011Inventor: Lai Chee MAN
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Patent number: 7880934Abstract: A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g., 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. Although the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.Type: GrantFiled: December 6, 2007Date of Patent: February 1, 2011Assignee: Electronics for Imaging, Inc.Inventor: Lai Chee Man
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Patent number: 7653890Abstract: A Wafer Image Modeling and Prediction System (“WIMAPS”) is described that includes systems and methods that generate and/or apply models of resolution enhancement techniques (“RET”) and printing processes in integrated circuit (“IC”) fabrication. The WIMAPS provides efficient processes for use by designers in predicting the RET and wafer printing process so as to allow designers to filter predict printed silicon contours prior to application of RET and printing processes to the circuit design.Type: GrantFiled: April 1, 2005Date of Patent: January 26, 2010Assignee: Cadence Design Systems, Inc.Inventors: Chi-Ming Tsai, Lai-Chee Man, Yao-Ting Wang, Fang-Cheng Chang
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Patent number: 7636180Abstract: Methods and apparatus are provided to smooth a jagged outline of a reconstructed text generated through any of a variety of systems, such as, for example, an image scanner. Given the reconstructed text with a jagged outline, the methods smooth the outline of the text first through location of horizontal and vertical edges, and subsequent gray scale reconstruction of the edge ink level from a one-bit or a low number of bits edge pattern. The methods then provide identification of the local text outline pattern and corresponding ink level adjustment of the center pixel. The methods produce text having very smooth horizontal and vertical edges. The methods then smooth slanted edges, mend holes in the text, and remove isolated pixels of ink.Type: GrantFiled: April 25, 2005Date of Patent: December 22, 2009Assignee: Electronics for Imaging, Inc.Inventors: Ron J. Karidi, Lai Chee Man
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Patent number: 7307761Abstract: A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g. 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. While the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.Type: GrantFiled: December 12, 2002Date of Patent: December 11, 2007Assignee: Electronics for Imaging, Inc.Inventor: Lai Chee Man
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Patent number: 7248752Abstract: Methods and apparatus are provided for converting binary image data at a first resolution to binary image data at a second resolution, the methods including detecting the edges of the binary image data, sampling a corresponding point on or substantially near each of the edges, fitting a curve between the sampled points, and re-sampling the curve at the second resolution.Type: GrantFiled: August 27, 2003Date of Patent: July 24, 2007Assignee: Electronics For Imaging, Inc.Inventor: Lai Chee Man
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Patent number: 7177472Abstract: A text detection technique comprises local ramp detection, identification of intensity troughs (candidate text strokes), determination of stroke width, preliminary detection of text based on contrast and stroke width, and a consistency check.Type: GrantFiled: July 9, 2004Date of Patent: February 13, 2007Assignee: Electronics for Imaging, Inc.Inventors: Ron J. Karidi, Lai Chee Man
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Publication number: 20050268256Abstract: A Wafer Image Modeling and Prediction System (“WIMAPS”) is described that includes systems and methods that generate and/or apply models of resolution enhancement techniques (“RET”) and printing processes in integrated circuit (“IC”) fabrication.Type: ApplicationFiled: April 1, 2005Publication date: December 1, 2005Inventors: Chi-Ming Tsai, Lai-Chee Man, Yao-Ting Wang, Fang-Cheng Chang
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Patent number: 6885477Abstract: Methods and apparatus are provided to smooth a jagged outline of a reconstructed text generated through any of a variety of systems, such as, for example, an image scanner. Given the reconstructed text with a jagged outline, the methods smooth the outline of the text first through location of horizontal and vertical edges, and subsequent gray scale reconstruction of the edge ink level from a one-bit or a low number of bits edge pattern. The methods then provide identification of the local text outline pattern and corresponding ink level adjustment of the center pixel. The methods produce text having very smooth horizontal and vertical edges. The methods then smooth slanted edges, mend holes in the text, and remove isolated pixels of ink.Type: GrantFiled: December 11, 2002Date of Patent: April 26, 2005Assignee: Electronics for Imaging, Inc.Inventors: Ron J. Karidi, Lai Chee Man
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Publication number: 20050047680Abstract: Methods and apparatus are provided for converting binary image data at a first resolution to binary image data at a second resolution, the methods including detecting the edges of the binary image data, sampling a corresponding point on or substantially near each of the edges, fitting a curve between the sampled points, and re-sampling the curve at the second resolution.Type: ApplicationFiled: August 27, 2003Publication date: March 3, 2005Inventor: Lai Chee Man
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Publication number: 20040240736Abstract: A text detection technique comprises local ramp detection, identification of intensity troughs (candidate text strokes), determination of stroke width, preliminary detection of text based on contrast and stroke width, and a consistency check.Type: ApplicationFiled: July 9, 2004Publication date: December 2, 2004Inventors: Ron J. Karidi, Lai Chee Man
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Patent number: 6778700Abstract: A text detection technique comprises local ramp detection, identification of intensity troughs (candidate text strokes), determination of stroke width, preliminary detection of text based on contrast and stroke width, and a consistency check.Type: GrantFiled: March 14, 2001Date of Patent: August 17, 2004Assignee: Electronics for Imaging, Inc.Inventors: Ron J. Karidi, Lai Chee Man
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Publication number: 20040114190Abstract: A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g. 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. While the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.Type: ApplicationFiled: December 12, 2002Publication date: June 17, 2004Inventor: Lai Chee Man
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Publication number: 20030123094Abstract: Methods and apparatus are provided to smooth a jagged outline of a reconstructed text generated through any of a variety of systems, such as, for example, an image scanner. Given the reconstructed text with a jagged outline, the methods smooth the outline of the text first through location of horizontal and vertical edges, and subsequent gray scale reconstruction of the edge ink level from a one-bit or a low number of bits edge pattern. The methods then provide identification of the local text outline pattern and corresponding ink level adjustment of the center pixel. The methods produce text having very smooth horizontal and vertical edges. The methods then smooth slanted edges, mend holes in the text, and remove isolated pixels of ink.Type: ApplicationFiled: December 11, 2002Publication date: July 3, 2003Inventors: Ron J. Karidi, Lai Chee Man
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Publication number: 20030026480Abstract: A text detection technique comprises local ramp detection, identification of intensity troughs (candidate text strokes), determination of stroke width, preliminary detection of text based on contrast and stroke width, and a consistency check.Type: ApplicationFiled: March 14, 2001Publication date: February 6, 2003Inventors: Ron J. Karidi, Lai Chee Man
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Patent number: 6501565Abstract: Methods and apparatus are provided to smooth a jagged outline of a reconstructed text generated through any of a variety of systems, such as, for example, an image scanner. Given the reconstructed text with a jagged outline, the methods smooth the outline of the text first through location of horizontal and vertical edges, and subsequent gray scale reconstruction of the edge ink level from a one-bit or a low number of bits edge pattern. The methods then provide identification of the local text outline pattern and corresponding ink level adjustment of the center pixel. The methods produce text having very smooth horizontal and vertical edges. The methods then smooth slanted edges, mend holes in the text, and remove isolated pixels of ink.Type: GrantFiled: November 21, 2000Date of Patent: December 31, 2002Assignee: Electronics for Imaging, Inc.Inventors: Ron J. Karidi, Lai Chee Man
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Patent number: 6215306Abstract: The quality of spiral images depends on whether actual k-space sampling points are at their nominal positions. Although newer gradient systems can provide more accurate gradient waveforms, timing mis-registration between data acquisition and gradient systems can significantly distort the positions of samples. Even after the timing of data acquisition is tuned, minor residual errors can still cause shading artifacts which are problematic for quantitative MRI applications, such as the phase-contrast method. Although ideally measuring the actual k-space trajectory can correct for the timing errors, it requires additional data acquisition and scan time. The present invention employs off-centered spiral trajectories which are more robust against timing errors and applies them to the phase-contrast method. The new trajectories turn shading artifacts into a slowly-varying linear phase in reconstructed images without affecting the magnitude of images.Type: GrantFiled: May 14, 1999Date of Patent: April 10, 2001Assignee: Board of Trustees of the Leland Stanford Junior UniversityInventors: Chi-Ming Tsai, Lai-Chee Man