Patents by Inventor Yee Seung Ng
Yee Seung Ng 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: 7548343Abstract: An apparatus and method for calibrating a multi-color imaging system are provided. Color values are measured for each of the different color patches, and compared to target process-sensitive colors color values, representing a weight-adjusted memory color. An error value is calculated. The error value represents a deviation of the measured color values from the target color values. The input values for each colorant then are independently adjusted to reduce the error value to a predetermined degree.Type: GrantFiled: October 28, 2005Date of Patent: June 16, 2009Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Hwai-Tzuu Tai, Chung-Hui Kuo, Dmitri Anatolyevich Gusev
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Patent number: 7508545Abstract: A method of printing comprising the steps of detecting a contour in a first color space image, locating the contour, mapping the image into the second image space, and changing the mapping curve shape, changing the printer profile (e.g. changing the printer mapping function), editing the image, or other method to reduce or eliminate perceived contouring.Type: GrantFiled: September 27, 2004Date of Patent: March 24, 2009Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Chung-Hui Kuo, Dmitri Anatolyevich Gusev
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Patent number: 7139521Abstract: Gloss, differential gloss, and image relief of a printed image may be controlled by utilizing a combination of technologies in the appropriate manner. These technologies include the use of transparent toner overcoats, negative transparent toner masks, variable screen transparent toner screen masks, UV coaters, and post-press belt fusing. Unlike conventional systems, which may increase gloss at a cost of also increasing image relief, the present invention may produce an image having a controlled gloss, differential gloss, and image relief.Type: GrantFiled: December 21, 2004Date of Patent: November 21, 2006Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Hwai-Tzuu Tai
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Patent number: 6608641Abstract: A printer for printing color toner images on a receiver member of any of a variety of textures. The printer has a number of tandemly arranged electrophotographic image-forming modules respectively including a plurality of imaging subsystems to form a colored toner image transferred to a receiver member, the transfer of toner images from each of the modules forming a color print of the receiver member which is fused to form a desired color print. The image quality of the color print is produced by control of nonoperational co-optimization of fusing parameters and imaging subsystem parameters enabling printing on the variety of textures of receiver member.Type: GrantFiled: June 27, 2002Date of Patent: August 19, 2003Assignee: Nexpress Solutions LLCInventors: Peter Steven Alexandrovich, Richard George Allen, Muhammed Aslam, Jiann-Hsing Chen, Diane M. Herrick, Robert Arthur Lancaster, Yee Seung Ng, Joseph A. Pavlisko, Hwai-Tzuu Tai, Thomas Nathaniel Tombs
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Patent number: 6466331Abstract: In an electrostatographic recording apparatus and method of forming images on a charge retentive surface such as a photoconductive member using a single writer source, the surface is uniformly charged by a corona charger to a predetermined voltage potential level. An image frame is then exposed on a pixel by pixel basis with varying amounts of exposure by the source for at least some pixels to form a tri-state type of latent image on the image frame including a charged area developable (CAD) latent image having at least some exposed pixels at various different sub-levels of exposure within the CAD latent image, a discharged-area developable (DAD) latent image having at least some exposed pixels at various different sub-levels of exposure within said discharged area developable image, and a background area The DAD and CAD latent images are then developed with toners of two different colors by two different developer sources.Type: GrantFiled: April 10, 1996Date of Patent: October 15, 2002Assignee: Nexpress Solutions LLCInventors: Hwai-Tzuu Tai, Yee Seung Ng, Richard George Allen
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Patent number: 6113212Abstract: An image recording apparatus and method includes a plurality of printheads and a plurality of heat exchangers. Each of the heat exchangers is thermally coupled with a respective one of the printheads. A preferred heat exchanger is a heat pipe wherein a cooling medium is circulated through each heat pipe. A flexible thermal link connects each of the heat exchangers with another of the heat exchangers to facilitate flexibility in mounting of the heat exchangers relative to each other.Type: GrantFiled: April 16, 1998Date of Patent: September 5, 2000Assignee: Eastman Kodak CompanyInventor: Yee Seung Ng
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Patent number: 6088050Abstract: In a non-impact recording apparatus that includes a plurality of recording elements, there is provided a source of first data signals representing for each of plural pixels density, size or percentage of coverage for recording. A first look-up table memory is responsive to the first data signals for adjusting the density, size or percentage coverage of each of the pixels with a gamma adjustment related to density development by the apparatus and generates multibit gamma adjusted second data signals. A second look-up table memory generates a third signal related to a characteristic of the recording elements such as for nonuniformity correction. A process look-up table memory is responsive to the gamma adjusted second data signals and the third signals for generating fourth multibit signals relating to exposure on-times for recording pixels by the recording elements. The use of the three look-up table memories results in substantial saving in memory requirements.Type: GrantFiled: December 31, 1996Date of Patent: July 11, 2000Assignee: Eastman Kodak CompanyInventor: Yee Seung Ng
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Patent number: 6078697Abstract: A method and apparatus are disclosed for processing image information for identifying an image type of a current pixel for rendering the current pixel in accordance with a rendering operation suited for the identified type. Each current pixel is examined in accordance with first predetermined criteria. In response to this examination, for each of plural image types, there is generated a signal representing a probability related value that the current pixel is of that image type. Based on probability related values, the image type of the current pixel is determined. However, for some current pixels a first signal is generated representing a preliminary evaluation that the image type is indeterminate relative to assignment to one of plural respective image types. There is then provided an evaluation for the indeterminate current pixel in accordance with second predetermined criteria.Type: GrantFiled: October 1, 1996Date of Patent: June 20, 2000Assignee: Eastman Kodak CompanyInventor: Yee Seung Ng
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Patent number: 6021256Abstract: An image processing system for providing edge enhancement of low resolution binary image files processes the low resolution data in sections or windows using a binary edge enhancement processor unit to determine whether an edge transition or "kink site" occurs within each window. The edge enhancement processor includes a decision matrix that identifies a pixel based on a calculated gradient magnitude and direction. In one operating mode, the original data in the window is replaced with edge enhanced gray-scale data stored in a look-up table if a kink site is identified. In a second operating mode original data is replaced with higher resolution binary data. To improve speed of operation of the processor, a set of criteria used for determining where enhancement pixels are to be generated has logic operators used for processing the criteria operated simultaneously with a bias provided favoring determinations having closer proximity towards a site likely to require image enhancements.Type: GrantFiled: September 3, 1996Date of Patent: February 1, 2000Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Glenn Robert Van Lare, Richard Thomas Fischer
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Patent number: 5937147Abstract: A problem of mismatch in pixel resolution between a front-end device, at one relatively low pixel resolution, and an output device such as a non-impact printer or a display at a higher pixel resolution is overcome by providing for grey level enhancement of low pixel resolution binary image data to minimize jaggies in a printed or displayed image, and then increasing the pixel resolution of the grey level enhanced image data to match that of the output device.Type: GrantFiled: September 3, 1996Date of Patent: August 10, 1999Assignee: Eastman Kodak CompanyInventor: Yee Seung Ng
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Patent number: 5914744Abstract: A non-impact printer apparatus and method employs a printhead including a plurality of recording elements and drivers for driving respective recording elements in response to data relative to respective corrected exposure times for recording respective pixels. A first data storage device stores data relative to associating sets of respective recording elements with respective bins. The first data storage device is responsive to first input signals identifying respective recording elements and outputs second signals relative to respective bin assignment numbers for the respective recording elements. A second data storage device is responsive to the second signals for outputting data relative to corrected exposure times for recording respective pixels by respective recording elements. The bin assignment determination for recording elements are established by propagating exposure error calculated from an adjacent respective recording element.Type: GrantFiled: April 11, 1997Date of Patent: June 22, 1999Assignee: Eastman Kodak CompanyInventor: Yee Seung Ng
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Patent number: 5818501Abstract: A non-impact printer apparatus includes a printhead having a plurality of recording elements. The printhead further includes a non-volatile memory that stores prebinned data representing recording characteristics relative to the recording elements. The prebinned data includes (a) data associating respective recording elements with respective bins; and (b) data relative to a characteristic of each bin. A controller means is located off of the printhead for generating tables for correcting for non-uniformity of the recording elements. The controller uses the prebinned data for generating the tables.Type: GrantFiled: December 28, 1995Date of Patent: October 6, 1998Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Isaac I. Ajewole, William J. Noonan
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Patent number: 5809216Abstract: A non-impact recording apparatus and method is described for recording pixels on a recording medium by recording sub-pixel recording portions of the pixel represented by a multibit recording data signal having a most significant data bit and a least significant data bit in a series of consecutive subline recording intervals. The apparatus includes one or more recording elements that are drivable by driver currents to generate recordable output signals such as light or ink droplets or heat. A driver provides driver currents to each recording element during plural subline recording intervals to record the pixel. One driver current is provided during one subline interval for one duration that is different than a second driver current that is provided during a second subline interval for a second duration.Type: GrantFiled: December 31, 1996Date of Patent: September 15, 1998Assignee: Eastman Kodak ComapnyInventor: Yee Seung Ng
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Patent number: 5739841Abstract: A non-impact printer apparatus includes a printhead having a plurality of recording elements. Nonuniformities in emission characteristics of the recording elements are corrected using look-up tables (LUT) assemblages that include a first LUT wherein the recording elements are binned in accordance with bin values associated with their emission characteristics and a second LUT wherein bin values, output from the first LUT are used to address various tables providing exposure correction. The first and second LUTs are advantageously dual port RAM devices that allow operation during printing while simultaneously allowing loading of data into the tables for use for subsequent printing. Thus, process conditions may be continually monitored and correction data updated without delaying of current printing which may occur using correction data already stored in the LUT assemblages.Type: GrantFiled: December 28, 1995Date of Patent: April 14, 1998Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Hieu Trong Pham
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Patent number: 4686163Abstract: An electrophotographic imaging method is described that uses an element comprising a photoconductive layer on an electrically conducting substrate capable of transmitting actinic radiation to which the photoconductive layer is responsive, and a dielectric support, releasably adhered to the substrate, comprising the photoconductive layer or an overcoat thereof forming a surface of the element capable of holding an applied electrostatic charge. To use the element, the surface of the dielectric support is charged, and the photoconductive layer is imagewise-exposed to actinic radiation, thereby forming a developable electrostatic image on the dielectric surface. The electrostatic image, in turn, is developed with toner to form a first color image.Type: GrantFiled: May 2, 1986Date of Patent: August 11, 1987Assignee: Eastman Kodak CompanyInventors: Yee Seung Ng, Lawrence E. Contois, John D. Mitchell, James D. Walling