Patents by Inventor Chang-Ki Min
Chang-Ki Min 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: 12217399Abstract: A tone mapping circuit includes: a tone mapping unit suitable for generating a corrected color image by correcting an input image corresponding to pixel data provided from a pixel array; and a noise removing unit suitable for calculating a deviation of the input image based on the input image and the corrected color image, and removing noise from the corrected color image to generate a new output image.Type: GrantFiled: September 20, 2021Date of Patent: February 4, 2025Assignee: SK hynix Inc.Inventor: Chang Ki Min
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Patent number: 11887282Abstract: A noise removing circuit includes an image combiner suitable for generating a high dynamic range (HDR) image by combining images having different exposure times; a detailed image generator suitable for generating a detailed image from the HDR image; an image strength evaluator suitable for evaluating strength of the detailed image; and a noise coring component suitable for performing a noise coring operation for removing noise from a region of the detailed image in which a signal to noise ratio (SNR) has decreased using a low threshold and a saturation threshold when the strength of the detailed image is less than a reference value.Type: GrantFiled: March 30, 2023Date of Patent: January 30, 2024Assignee: SK hynix Inc.Inventors: Dong Ik Kim, Jin Su Kim, Chang Ki Min, Seong Hee Park
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Publication number: 20230237624Abstract: A noise removing circuit includes an image combiner suitable for generating a high dynamic range (HDR) image by combining images having different exposure times; a detailed image generator suitable for generating a detailed image from the HDR image; an image strength evaluator suitable for evaluating strength of the detailed image; and a noise coring component suitable for performing a noise coring operation for removing noise from a region of the detailed image in which a signal to noise ratio (SNR) has decreased using a low threshold and a saturation threshold when the strength of the detailed image is less than a reference value.Type: ApplicationFiled: March 30, 2023Publication date: July 27, 2023Inventors: Dong Ik KIM, Jin Su KIM, Chang Ki MIN, Seong Hee PARK
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Patent number: 11651476Abstract: A noise removing circuit includes an image combiner suitable for generating a high dynamic range (HDR) image by combining images having different exposure times; a detailed image generator suitable for generating a detailed image from the HDR image; an image strength evaluator suitable for evaluating strength of the detailed image; and a noise coring component suitable for performing a noise coring operation for removing noise from a region of the detailed image in which a signal to noise ratio (SNR) has decreased using a low threshold and a saturation threshold when the strength of the detailed image is less than a reference value.Type: GrantFiled: January 18, 2021Date of Patent: May 16, 2023Assignee: SK hynix Inc.Inventors: Dong Ik Kim, Jin Su Kim, Chang Ki Min, Seong Hee Park
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Publication number: 20220318955Abstract: A tone mapping circuit includes: a tone mapping unit suitable for generating a corrected color image by correcting an input image corresponding to pixel data provided from a pixel array; and a noise removing unit suitable for calculating a deviation of the input image based on the input image and the corrected color image, and removing noise from the corrected color image to generate a new output image.Type: ApplicationFiled: September 20, 2021Publication date: October 6, 2022Inventor: Chang Ki MIN
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Patent number: 11457162Abstract: A local tone mapping circuit includes an average value calculation unit suitable for calculating an average value of an absolute value of a difference between a center pixel data and a neighboring pixel data of the center pixel data; a range calculation unit suitable for calculating a range between a maximum value and a minimum value of the absolute value of a difference between the center pixel data and the neighboring pixel data; and a local tone mapping strength adjusting unit suitable for differently allocating a weighted value according to a distance between a center pixel and an edge pixel among neighboring pixels of the center pixel based on the range between the maximum value and the minimum value calculated by the range calculation unit and the average value calculated by the average value calculation unit, and adjusting a local tone mapping strength according to an allocated weighted value.Type: GrantFiled: November 4, 2020Date of Patent: September 27, 2022Assignee: SK hynix Inc.Inventors: Chang Ki Min, Jin Su Kim
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Publication number: 20220110787Abstract: Proposed is an oral cooling device using a cooling balloon, including: a cooling water supply portion provided with a cooler that cools cooling water and a pump that supplies and recovers the cooling water; a cooling water hose portion connected to the cooling water supply portion to transfer the supplied cooling water and recover the recovered cooling water to the cooling water supply portion; and a cooling balloon portion which is connected to an end portion of the cooling water hose portion, expands by the supplied cooling water to cool an inside of an oral cavity of a patient after being inserted into a mouth of the patient, and contracts in a case where the cooling water is recovered to the cooling water supply portion.Type: ApplicationFiled: September 21, 2020Publication date: April 14, 2022Inventors: Sung Soo PARK, Byung Hee HWANG, Chang Ki MIN, Jong Hyuk LEE
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Publication number: 20220020122Abstract: A noise removing circuit includes an image combiner suitable for generating a high dynamic range (HDR) image by combining images having different exposure times; a detailed image generator suitable for generating a detailed image from the HDR image; an image strength evaluator suitable for evaluating strength of the detailed image; and a noise coring component suitable for performing a noise coring operation for removing noise from a region of the detailed image in which a signal to noise ratio (SNR) has decreased using a low threshold and a saturation threshold when the strength of the detailed image is less than a reference value.Type: ApplicationFiled: January 18, 2021Publication date: January 20, 2022Inventors: Dong Ik KIM, Jin Su KIM, Chang Ki MIN, Seong Hee PARK
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Publication number: 20210360178Abstract: A local tone mapping circuit includes an average value calculation unit suitable for calculating an average value of an absolute value of a difference between a center pixel data and a neighboring pixel data of the center pixel data; a range calculation unit suitable for calculating a range between a maximum value and a minimum value of the absolute value of a difference between the center pixel data and the neighboring pixel data; and a local tone mapping strength adjusting unit suitable for differently allocating a weighted value according to a distance between a center pixel and an edge pixel among neighboring pixels of the center pixel based on the range between the maximum value and the minimum value calculated by the range calculation unit and the average value calculated by the average value calculation unit, and adjusting a local tone mapping strength according to an allocated weighted value.Type: ApplicationFiled: November 4, 2020Publication date: November 18, 2021Inventors: Chang Ki MIN, Jin Su KIM
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Patent number: 10735663Abstract: An image sensing device includes an image sensor that converts incident light into a first image by operating the image sensor under a first exposure time and a second image by operating the image sensor under a second exposure time which is different from the first exposure time; a calculation circuit to receive the first image and generate a third image corresponding to the second image based on the first image and a exposure ratio between the first and the second exposure times; a combination circuit to combine the second image and the third image to generate a combination image; a conversion circuit to convert or maintain each code value of the combination image to have the same bit depth based on the combination image and the exposure ratio; and a memory circuit coupled to the conversion circuit to store image values outputted from the conversion circuit.Type: GrantFiled: December 13, 2018Date of Patent: August 4, 2020Assignee: SK hynix Inc.Inventor: Chang-Ki Min
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Publication number: 20190306398Abstract: An image sensing device includes an image sensor that converts incident light into a first image by operating the image sensor under a first exposure time and a second image by operating the image sensor under a second exposure time which is different from the first exposure time; a calculation circuit to receive the first image and generate a third image corresponding to the second image based on the first image and a exposure ratio between the first and the second exposure times; a combination circuit to combine the second image and the third image to generate a combination image; a conversion circuit to convert or maintain each code value of the combination image to have the same bit depth based on the combination image and the exposure ratio; and a memory circuit coupled to the conversion circuit to store image values outputted from the conversion circuit.Type: ApplicationFiled: December 13, 2018Publication date: October 3, 2019Inventor: Chang-Ki Min
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Patent number: 9832389Abstract: An apparatus includes an image conversion unit suitable for converting a short exposure block according to an exposure ratio; a motion and saturation detection unit suitable for receiving a long exposure block and an L short exposure block converted by the image conversion unit, and detecting motion and saturation; a radiance map generation unit suitable for fusing the long and L short exposure blocks using a guided filter, and generating a radiance map; a luminance acquirement unit suitable for acquiring luminance of the radiance map, and generating luminance using the L short exposure block or respectively generating luminance using the long and L short exposure blocks; and a dynamic range compression unit suitable for performing global tone mapping using the luminance acquired by the luminance acquirement unit, and compressing a dynamic range.Type: GrantFiled: October 19, 2015Date of Patent: November 28, 2017Assignee: SK Hynix Inc.Inventors: Chang-Ki Min, Nam-Hyun Kim, Se-Myoung Jung
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Publication number: 20160352995Abstract: An apparatus includes an image conversion unit suitable for converting a short exposure block according to an exposure ratio; a motion and saturation detection unit suitable for receiving a long exposure block and an L short exposure block converted by the image conversion unit, and detecting motion and saturation; a radiance map generation unit suitable for fusing the long and L short exposure blocks using a guided filter, and generating a radiance map; a luminance acquirement unit suitable for acquiring luminance of the radiance map, and generating luminance using the L short exposure block or respectively generating luminance using the long and L short exposure blocks; and a dynamic range compression unit suitable for performing global tone mapping using the luminance acquired by the luminance acquirement unit, and compressing a dynamic range.Type: ApplicationFiled: October 19, 2015Publication date: December 1, 2016Inventors: Chang-Ki MIN, Nam-Hyun KIM, Se-Myoung JUNG
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Patent number: 9002129Abstract: A temporal noise reduction method and a temporal noise reduction device are provided. The temporal noise reduction device includes a temporal filter unit that performs a temporal filtering operation using pixel values (CP) of an N×M array in a current frame and pixel values (FP) of an N×M array located at the same position in a neighboring frame separated by a distance TP from the current frame and a motion filter unit that detects a motion of a pixel image from the resultant values of the temporal filter unit and that eliminates noise of a motion-abundant pixel value using a spatial filter. It is possible to effectively reduce noise of an image to prevent deterioration in image quality of the image and to improve performance of post-processing techniques.Type: GrantFiled: March 21, 2013Date of Patent: April 7, 2015Assignee: Mtekvision Co., Ltd.Inventor: Chang-Ki Min
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Publication number: 20130251282Abstract: A temporal noise reduction method and a temporal noise reduction device are provided. The temporal noise reduction device includes a temporal filter unit that performs a temporal filtering operation using pixel values (CP) of an N×M array in a current frame and pixel values (FP) of an N×M array located at the same position in a neighboring frame separated by a distance TP from the current frame and a motion filter unit that detects a motion of a pixel image from the resultant values of the temporal filter unit and that eliminates noise of a motion-abundant pixel value using a spatial filter. It is possible to effectively reduce noise of an image to prevent deterioration in image quality of the image and to improve performance of post-processing techniques.Type: ApplicationFiled: March 21, 2013Publication date: September 26, 2013Applicant: MTEKVISION CO., LTD.Inventor: Chang-Ki MIN
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Patent number: D376242Type: GrantFiled: June 27, 1994Date of Patent: December 3, 1996Assignee: Daewoo Heavy Industries Co., Ltd.Inventors: Kwon-Hong Jung, Chang-Ki Min