Zhen He
Zhen He, Sherwood, OR US
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20090153911 | Apparatus and Methods for Two Point Tone Reproduction Curve Calibration - Systems and methods provide increased accuracy in recalibrating the tone reproduction curve (TRC) for a photoelectric image sensor that senses density values. The sensor outputs sensed density values for tone patches. A recalibrated TRC is calculated from the original TRC, the known densities of the tone patches, and the sensed density values of the tone patches. | 06-18-2009 |
20090195798 | VECTOR HALF-TONING WITH MINIMUM LUMINANCE VARIATION DOT FORMATION - What is disclosed is a system and method for improving vector half-toning in dot-on-dot printing devices. The method utilizes minimum spatial luminance variation to achieve a smooth color half-toning pattern transition. Red (M+Y), blue (C+M), and green (C+Y) dots in addition to CMY dots are utilized to achieve darker colors without black ink. As gray values to be printed get darker, green, red and blue pixels get introduced. Black is not introduced until the gray values are darker by approximately | 08-06-2009 |
20090195836 | HIERARCHICAL COLOR ERROR DIFFUSION IN A CMYKRGB DOMAIN - What is provided are a novel system, method, and computer program product for hierarchical (telescopic) color error diffusion which effectively controls the dot distribution for both primary and secondary dot formation which covers the class of error diffusion that follow telescopic dot firing constraint principles. In one example embodiment, an input CMYK ink coverage is received. The input CMYK ink coverage is transformed into a CMYKRGB domain using a CMYK to CMYKRGB conversion. A weighted error value can be added to each color component of the CMYKRGB domain. The color components of the CMYKRGB domain are hierarchically grouped into a plurality of subgroups based on relative dot visibility. More visible subgroups are half-toned earlier to achieve maximum uniform dot distribution. Dots of specific color channels within subgroups are fired based on thresholding and a set of decision rules provided herein. | 08-06-2009 |
20100020339 | MINIMIZING DOT GRAININESS IN DOT-ON-DOT PRINTING DEVICES - What is disclosed is a novel system and method for minimizing dot visibility in color marking devices capable of dot-on-dot printing. The present method achieves minimum dot visibility for a given dispersed-dot screen by performing a CMYK to CMYKRGB conversion which uses less visible dots as much as possible before more visible dots are introduced. The output color dot coverages are calculated sequentially to minimize the coverage of more visible dots in a decreasing order of brightness. Resulting images have noticeably reduced halftone graininess, particularly in the mid to darker tone areas. The present method is also computationally efficient. | 01-28-2010 |
20100103465 | COLOR PIXEL ERROR DIFFUSION IN A CMYK INPUT COLOR SPACE - What is disclosed is a system and method for diffusing pixel error in a halftoning process in a color management system. The present method divides a modified CMYK input into a real and imaginary portions. The real portion is the coverage achieved by a physically realizable positive dot. The imaginary portion comprises a an imaginary negative dot and an imaginary excess dot. Each of these dots are processed separately, on a per-pixel basis, in a novel CMYK to CMYKKpRGB conversion discussed in detail herein. Hierarchical thresholding is preformed on the conversion output to produce a high-quality halftone result. A cumulative pixel error sum is derived therefrom and combined with the input CMYK coverages of a next pixel. All pixels are processed. The halftone output generated hereby has the pixel error compensated. Other embodiments are provided. | 04-29-2010 |
20100259802 | CMYK TO CMYKKpRGB TRANSFORM FOR HALFTONE DOT OVERLAP CONTROL - What is disclosed is a novel system and method for performing a CMYK to CMYKK | 10-14-2010 |
20110102848 | MEMORY EFFICIENT HIERARCHICAL ERROR DIFFUSION WITH COLOR CONSISTENCY CONSTRAINTS - A halftoning process for printing digital images includes: receiving CMYK input pixel data that define an input pixel of an input digital image in terms of continuous tone input data values for cyan, magenta, yellow, and black colors, wherein I(C), I(M), I(Y), I(K) respectively correspond to the continuous tone input data value for the cyan, magenta, yellow, and black colors; converting the CMYK input pixel data to modified CMYKRGB* pixel data that define the input pixel in terms of error-adjusted continuous tone data values for the cyan, magenta, yellow, and black colors, and also in terms of red, green and blue colors, wherein I*(C), I*(M), I*(Y), I*(K), I*(R), I*(G), I*(B) respectively correspond to the error-adjusted converted continuous tone input data values for the cyan, magenta, yellow, black, red, green, blue colors; quantizing the modified CMYKRGB* pixel data to derive intermediate output CMYKRGB pixel data in which the cyan, magenta, yellow, black, red, green, and blue colors are each defined by either a first quantized value that represents no color or a second quantized pixel value that represents full color, wherein O′(C), O′(M), O′(Y), O′(K), O′(R), O′(G), O′(B) respectively define said intermediate output pixel data for the cyan, magenta, yellow, black, red, green, and blue colors, and wherein the intermediate output CMYKRGB pixel data define an output pixel that corresponds to the input pixel; converting the intermediate output CMYKRGB pixel data to CMYK output data in which the output pixel is defined in terms of CMYK output values O(C), O(M), O(Y), O(K) respectively for the cyan, magenta, yellow, and black colors, wherein each of the CMYK output values is defined by either a first output value representing no color or a second output value representing full color. | 05-05-2011 |
Zhen He, Bayside, WI US
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20100196742 | Electricity Generation Using Phototrophic Microbial Fuel Cells - A sediment-type self-sustained phototrophic microbial fuel cell for generating electricity through the syntrophic interaction between photosynthetic microorganisms and heterotrophic bacteria in algae cultivation ponds used for biodiesel production. The microbial fuel cell is operable to continuously produce electricity without the external input of exogenous organics or nutrients. | 08-05-2010 |
20110311887 | MICROBIAL DESALINATION CELLS - A microbial desalination cell includes an anode, a cathode, a saline solution chamber and a cathode rinsing assembly. The anode is at least partially positioned within an anode chamber for containing an aqueous reaction mixture including one or more organic compounds and one or more bacteria for oxidizing the organic compounds. The cathode is directly exposed to air. The saline solution chamber is positioned between the anode and the cathode, and is separated from the anode by an anion exchange material and from the cathode by a cation exchange material. The cathode rinsing assembly is for rinsing the cathode with a catholyte. | 12-22-2011 |
20120082868 | Floating Microbial Fuel Cells - A microbial fuel cell (MFC) includes a cation exchange membrane defining an anode chamber, an anode positioned in the anode chamber, and a cathode in contact with an exterior of the cation exchange membrane. A restrictor in contact with the cation exchange membrane defines an opening through which water flows into or out of the anode chamber. The MFC includes bacteria in the anode chamber that oxidize organic compounds in the water while oxygen is reduced at the cathode, such that electricity is generated in the absence of an external power source. In an example, the MFC is coupled to a buoy and provides electricity to an electrically powered device also coupled to the buoy, thereby providing a low-maintenance source of power in remote locations. The electrically powered device may be, for example, a light or a sensor. | 04-05-2012 |
20130017414 | OSMOTIC BIOELECTROCHEMICAL SYSTEMS - A bioelectrochemical system includes an anode, a saline solution chamber, and a cathode. The anode is at least partially positioned within an anode chamber containing an aqueous reaction mixture including one or more organic compounds and one or more bacteria for oxidizing the organic compounds. The saline solution chamber contains a draw solution and is separated from the anode chamber by a forward osmosis membrane. Water diffuses across the forward osmosis membrane from the aqueous reaction mixture to the draw solution. | 01-17-2013 |
20130017415 | INTEGRATED PHOTO-BIOELECTROCHEMICAL SYSTEMS - A bioelectricalchemical system includes an anode, an algal bioreactor, and a cathode. The anode is at least partially positioned within an anode chamber containing a first aqueous reaction mixture including one or more organic compounds and one or more bacteria for oxidizing the organic compounds. The algal bioreactor contains a second aqueous reaction mixture including one or more nutrients and one or more algae for substantially removing the nutrients from the second aqueous reaction mixture. The cathode is at least partially positioned within the algal bioreactor. | 01-17-2013 |
Zhen He, Los Angeles, CA US
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20110183159 | ELECTRICITY GENERATION USING MICROBIAL FUEL CELLS - A microbial fuel cell for generating electricity. The microbial fuel cell includes an anode and a cathode electrically coupled to the anode. The anode is in contact with a first fluid including microorganisms capable of catalyzing the oxidation of ammonium. The anode is in contact with a second fluid including microorganisms capable of catalyzing the reduction of nitrite. The anode and the cathode may be housed in a single compartment, and the cathode may rotate with respect to the anode. The microbial fuel cell can be used to remove ammonium from wastewater, to generate electricity, or both. | 07-28-2011 |
Zhen He, Shenzhen CN
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20140192212 | Image Processing Method and Apparatus - Embodiments of the present invention disclose an image processing method and an apparatus. The image processing method includes: receiving information of starting a first camera and a second camera simultaneously to perform photographing; using the first camera to photograph and obtain a first image, and using the second camera to photograph and obtain a second image; and displaying the first image and the second image simultaneously. In the embodiments of the present invention, two cameras are started simultaneously to perform bidirectional photographing, and the images taken by both cameras are displayed simultaneously, so that front and back scene images are captured simultaneously and a panoramic image is obtained. | 07-10-2014 |
20150077392 | TERMINAL, AND TERMINAL CONTROL METHOD AND APPARATUS - Embodiments of the present invention relate to a terminal and a terminal control method and apparatus to solve a problem that a shortcut operation cannot be implemented on a terminal. The terminal includes: a pressure detecting apparatus configured to detect pressure on various positions in a first specified area on a surface of the terminal; an action detecting apparatus configured to detect a user action on a second specified area on the surface of the terminal; and a processor configured to execute, when it is determined that the first specified area on the surface of the terminal has more than a specified number of positions on which the pressure exceeds preset pressure, an operation corresponding to a user action on the second specified area on the surface of the terminal. | 03-19-2015 |
20150085167 | Image Processing Method and Apparatus - An image processing method and an apparatus are provided. The image processing method includes receiving information of starting a first camera and a second camera simultaneously to perform photographing; using the first camera to photograph and obtain a first image, and using the second camera to photograph and obtain a second image; and displaying the first image and the second image simultaneously. In the embodiments of the present invention, two cameras are started simultaneously to perform bidirectional photographing, and the images taken by both cameras are displayed simultaneously, so that front and back scene images are captured simultaneously and a panoramic image is obtained. | 03-26-2015 |