Patents by Inventor Jung-tag Gong
Jung-tag Gong 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: 11295415Abstract: An image forming apparatus, a scanned image correction method of an image forming apparatus, and a non-transitory computer-readable recording medium are provided. The image forming apparatus includes a scan unit to scan a document to generate a scanned image and a processor to detect a skew angle of the scanned image, determine a reference point on the basis of a position of a content in the scanned image, and rotate the scanned image around the determined reference point to correct the skew angle.Type: GrantFiled: June 16, 2017Date of Patent: April 5, 2022Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Hae-kee Lee, Jung-tag Gong, Chang-hyung Lee, Ho-keun Lee
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Publication number: 20210352189Abstract: An example of a computer-readable medium storing machine-readable instructions. When executed, the machine-readable instructions may cause a processor to control a laser to print a test pattern. The test pattern may be scanned to determine visibility of pixels. The power of a laser may be adjusted based on the visibilities to print a security pixel.Type: ApplicationFiled: January 31, 2019Publication date: November 11, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventors: Mark Q. Shaw, Kyeongman Kim, Jung Tag Gong
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Publication number: 20190180415Abstract: An image forming apparatus, a scanned image correction method of an image forming apparatus, and a non-transitory computer-readable recording medium are provided. The image forming apparatus includes a scan unit to scan a document to generate a scanned image and a processor to detect a skew angle of the scanned image, determine a reference point on the basis of a position of a content in the scanned image, and rotate the scanned image around the determined reference point to correct the skew angle.Type: ApplicationFiled: June 16, 2017Publication date: June 13, 2019Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Hae-kee LEE, Jung-tag GONG, Chang-hyung LEE, Ho-keun LEE
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Patent number: 9049335Abstract: An image scanning apparatus includes a scanner configured to scan a manuscript and generate a plurality of scan images; a discriminator configured to calculate a color ratio regarding each of the generated plurality of scan images, compare the calculated color ratio and a predetermined reference value, and discriminate color or black and white regarding each of the generated plurality of scan images; and a controller configured to control the discriminator so that a same discrimination is performed regarding ‘a scan image having a color ratio within a predetermined range including the predetermined reference value’ of among the plurality of scan images.Type: GrantFiled: March 11, 2014Date of Patent: June 2, 2015Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Su-han Song, Jung-tag Gong
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Publication number: 20150036195Abstract: An image scanning apparatus may include a scanner configured to scan a manuscript and generate a plurality of scan images; a discriminator configured to calculate a color ratio regarding each of the generated plurality of scan images, compare the calculated color ratio and a predetermined reference value, and discriminate color or black and white regarding each of the generated plurality of scan images; and a controller configured to control the discriminator so that a same discrimination is can be performed regarding ‘a scan image having a color ratio within a predetermined range including the predetermined reference value’ of among the plurality of scan images.Type: ApplicationFiled: March 11, 2014Publication date: February 5, 2015Applicant: Samsung Electronics Co., Ltd.Inventors: Su-han Song, Jung-tag Gong
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Patent number: 8174553Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.Type: GrantFiled: February 16, 2011Date of Patent: May 8, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Jung-tag Gong, Goo-soo Gahang, Doo-jin Bang
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Publication number: 20110135339Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.Type: ApplicationFiled: February 16, 2011Publication date: June 9, 2011Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jung-tag GONG, Goo-soo Gahang, Doo-Jin Bang
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Patent number: 7911491Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.Type: GrantFiled: November 19, 2004Date of Patent: March 22, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jung-tag Gong, Goo-soo Gahang, Doo-Jin Bang
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Patent number: 7253829Abstract: A print apparatus including a photoconductive drum, a laser scanning unit (LSU) to scan a surface of the photoconductive drum, and an image processing unit to generate and output dot size information corresponding to externally input image data. The dot size information determines sizes of individual dots on an image to be printed, a memory unit to store dot size compensation values related to a scanning distance of laser beams emitted from the LSU to the surface of the photoconductive drum to the LSU. The compensation values change the dot size information. The apparatus further includes a light intensity difference compensation unit to compensate for the dot size information according to the stored compensation values if the dot size information is received, and a pulse width modulation (PWM) unit to generate and output a pulse signal to control the scanning of the laser beams of the LSU according to the compensated dot size information.Type: GrantFiled: October 20, 2004Date of Patent: August 7, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Goo-soo Gahang, Jung-tag Gong, Sang-yun Shin
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Patent number: 7209158Abstract: A scanning line alignment compensation apparatus and method for a laser printer. The scanning line alignment compensation apparatus includes a laser scanning unit (LSU) having a first laser diode and a second laser diode and at least one sync signal detection sensor that generates a sync signal based on at least one of the first laser diode and the second laser diode based on selectively driving either of the first laser diode and the second laser diode, and generates at least one offset sync signal having first and second sensor detection periods based on the sync signal generated based on the at least one of the first laser diode and the second laser diode; a compensation unit compensating for first and second video data input in synchronization with a video clock based on the first and second sensor detection periods; and a laser diode control unit outputting control signals to control the first laser diode and the second laser diode based on the compensated first and second video data.Type: GrantFiled: January 30, 2004Date of Patent: April 24, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Goo-soo Ghang, Jung-tag Gong
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Publication number: 20050128281Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.Type: ApplicationFiled: November 19, 2004Publication date: June 16, 2005Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jung-tag Gong, Goo-Goo Gahang, Doo-Jin Bang
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Publication number: 20050110863Abstract: A print apparatus including a photoconductive drum, a laser scanning unit (LSU) to scan a surface of the photoconductive drum, and an image processing unit to generate and output dot size information corresponding to externally input image data. The dot size information determines sizes of individual dots on an image to be printed, a memory unit to store dot size compensation values related to a scanning distance of laser beams emitted from the LSU to the surface of the photoconductive drum to the LSU. The compensation values change the dot size information. The apparatus further includes a light intensity difference compensation unit to compensate for the dot size information according to the stored compensation values if the dot size information is received, and a pulse width modulation (PWM) unit to generate and output a pulse signal to control the scanning of the laser beams of the LSU according to the compensated dot size information.Type: ApplicationFiled: October 20, 2004Publication date: May 26, 2005Applicant: Samsung Electronics Co., Ltd.Inventors: Goo-soo Gahang, Jung-tag Gong, Sang-yun Shin
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Publication number: 20040183893Abstract: A scanning line alignment compensation apparatus and method for a laser printer. The scanning line alignment compensation apparatus includes a laser scanning unit (LSU) having a first laser diode and a second laser diode and at least one sync signal detection sensor that generates a sync signal based on at least one of the first laser diode and the second laser diode based on selectively driving either of the first laser diode and the second laser diode, and generates at least one offset sync signal having first and second sensor detection periods based on the sync signal generated based on the at least one of the first laser diode and the second laser diode; a compensation unit compensating for first and second video data input in synchronization with a video clock based on the first and second sensor detection periods; and a laser diode control unit outputting control signals to control the first laser diode and the second laser diode based on the compensated first and second video data.Type: ApplicationFiled: January 30, 2004Publication date: September 23, 2004Applicant: Samsung Electronics Co., Ltd.Inventors: Goo-Soo Ghang, Jung-Tag Gong