Patents by Inventor Eun-Cheol CHOI

Eun-Cheol CHOI 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).

  • Patent number: 10896487
    Abstract: Provided are an apparatus and method of reducing noise of an image. The apparatus for reducing noise of an image includes: a motion detector configured to detect a motion from a current image; a weight setting unit configured to set a weight of the current image based on the motion and a weight of a previous image; and a noise reduction unit configured to apply the weight of the current image to the current image to reduce temporal noise of the current image.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: January 19, 2021
    Assignee: HANWHA TECHWIN CO.. LTD.
    Inventor: Eun Cheol Choi
  • Patent number: 10803563
    Abstract: Provided are an image processing apparatus and method. The image processing apparatus divides an image into a plurality of blocks, and enhances contrast in units of blocks by using a minimum value, a lower average value, an average value, an upper average value, and a maximum value of each block in the image.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: October 13, 2020
    Assignee: HANWHA TECHWIN CO., LTD.
    Inventor: Eun Cheol Choi
  • Publication number: 20200265557
    Abstract: A motion detection method using an image processing device may include: based on the noise level of a current frame, obtaining a weighted average of a sum of absolute differences (SAD) value and an absolute difference of sums (ADS) value; setting the weighted average as an initial motion detection value of each pixel; and selectively performing max filtering on motion detection values of the pixels to obtain a final motion detection value.
    Type: Application
    Filed: February 12, 2020
    Publication date: August 20, 2020
    Applicant: HANWHA TECHWIN CO., LTD.
    Inventor: Eun Cheol CHOI
  • Patent number: 10475188
    Abstract: Provided are an image processing device and an image enhancing method. The image enhancement method for the image processing device includes: calculating a first minimum value, a first maximum value, and a first average value of a luminance of a region based on a pixel in an image; calculating a first gain with respect to a pixel having a pixel value between the first minimum value and the first average value, and a second gain with respect to a pixel having a pixel value between the first average value and the first maximum value; and calculating a first correction value by correcting the pixel value of the pixel by using the first gain or the second gain according to a result of comparing the pixel value of the pixel with the first average value.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: November 12, 2019
    Assignee: HANWHA TECHWIN CO., LTD.
    Inventors: Jun Ho Gal, Eun Cheol Choi
  • Publication number: 20190244333
    Abstract: Provided are an image processing apparatus and method. The image processing apparatus divides an image into a plurality of blocks, and enhances contrast in units of blocks by using a minimum value, a lower average value, an average value, an upper average value, and a maximum value of each block in the image.
    Type: Application
    Filed: June 13, 2018
    Publication date: August 8, 2019
    Applicant: Hanwha Techwin Co., Ltd.
    Inventor: Eun Cheol CHOI
  • Publication number: 20190244328
    Abstract: Provided are an apparatus and method of reducing noise of an image. The apparatus for reducing noise of an image includes: a motion detector configured to detect a motion from a current image; a weight setting unit configured to set a weight of the current image based on the motion and a weight of a previous image; and a noise reduction unit configured to apply the weight of the current image to the current image to reduce temporal noise of the current image.
    Type: Application
    Filed: July 17, 2018
    Publication date: August 8, 2019
    Applicant: Hanwha Techwin Co., Ltd.
    Inventor: Eun Cheol CHOI
  • Publication number: 20180182070
    Abstract: Provided are an image processing device and an image enhancing method. The image enhancement method for the image processing device includes: calculating a first minimum value, a first maximum value, and a first average value of a luminance of a region based on a pixel in an image; calculating a first gain with respect to a pixel having a pixel value between the first minimum value and the first average value, and a second gain with respect to a pixel having a pixel value between the first average value and the first maximum value; and calculating a first correction value by correcting the pixel value of the pixel by using the first gain or the second gain according to a result of comparing the pixel value of the pixel with the first average value.
    Type: Application
    Filed: May 31, 2017
    Publication date: June 28, 2018
    Applicant: Hanwha Techwin Co., Ltd.
    Inventors: Jun Ho GAL, Eun Cheol CHOI
  • Patent number: 9454805
    Abstract: An apparatus and method for reducing noise of an image are provided. The apparatus includes: a temporal noise reduction unit configured to remove temporal noise from an input frame by adjusting a temporal noise reduction intensity of the input frame based on a pixel-based motion degree and a block-based motion degree that are detected from the input frame and a reference frame and generate a first output frame; and a spatial noise reduction unit configured to remove spatial noise from the first output frame by adjusting a spatial noise reduction intensity of the first output frame based on similarity between peripheral pixels of the first output frame and the pixel-based motion degree and the block-based motion degree, thereby to generate a final output frame.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: September 27, 2016
    Assignee: Hanwha Techwin Co., Ltd.
    Inventors: Eun Cheol Choi, Jae Cheol Lee
  • Patent number: 9344689
    Abstract: A camera system with a multi-spectral filter array and an image processing method thereof are disclosed. The method of processing an image that is output from an image sensor including a multi-spectral filter array including a color filter and a near infrared (NIR) filter includes interpolating an NIR channel of the image by using spatial information of color channels including a red channel, a green channel, and a blue channel; and interpolating the color channels of the image by using spatial information of the NIR channel.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: May 17, 2016
    Assignees: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Hanwha Techwin Co., Ltd.
    Inventors: Eun-Cheol Choi, Moon-Gi Kang
  • Patent number: 9285309
    Abstract: Provided is an image fusion apparatus using a multi-spectral filter array sensor, the image fusion apparatus including a separation unit configured to separate an input image input through the multi-spectral filter array sensor into an RGB image and a near infrared (NIR) image, a color reconstruction unit configured to extract an RGB image in a visible band by removing an NIR value incident together with R, G and B values through the multi-spectral filter array sensor from the R, G and B values, and an image fusion unit configured to fuse the RGB image in the visible band with the NIR image, in which a fusion rate of the RGB image and the NIR image is based on a size of each of the R, G and B values of the RGB image in the visible band.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: March 15, 2016
    Assignee: Hanwha Techwin Co., Ltd.
    Inventor: Eun-Cheol Choi
  • Patent number: 9280808
    Abstract: Provided are a method and apparatus for processing an image to remove fog from the image. The apparatus for processing an image includes: a transmission estimation unit configured to calculate a transmission of an input image by synthesizing pixel-based transmissions of current pixels of the current image including a fog component, and block-based transmissions of a plurality of blocks of a previous image, each block including a plurality of pixels; an airlight estimation unit configured to calculate airlight of the input image; and an image restoration unit configured to generate, based on the transmission and the airlight, a restored image in which the fog component is removed from the current image.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: March 8, 2016
    Assignee: Hanwha Techwin Co., Ltd.
    Inventor: Eun Cheol Choi
  • Publication number: 20150279006
    Abstract: An apparatus and method for reducing noise of an image are provided. The apparatus includes: a temporal noise reduction unit configured to remove temporal noise from an input frame by adjusting a temporal noise reduction intensity of the input frame based on a pixel-based motion degree and a block-based motion degree that are detected from the input frame and a reference frame and generate a first output frame; and a spatial noise reduction unit configured to remove spatial noise from the first output frame by adjusting a spatial noise reduction intensity of the first output frame based on similarity between peripheral pixels of the first output frame and the pixel-based motion degree and the block-based motion degree, thereby to generate a final output frame.
    Type: Application
    Filed: September 25, 2014
    Publication date: October 1, 2015
    Applicant: SAMSUNG TECHWIN CO., LTD.
    Inventors: Eun Cheol CHOI, Jae Cheol LEE
  • Patent number: 9135679
    Abstract: Provided is a method and apparatus for restoring color of an input image. The method includes: separating multiple band information of a near infrared (NIR) channel from information of the input image by using a correlation between a color channel and the NIR channel in the input image; obtaining estimated invisible light band information of the NIR channel from the multiple band information of the NIR channel and estimated multiple band information of the NIR channel which is estimated from the color channel; estimating invisible light band information of the color channel based on the estimated invisible light band information of the NIR channel; and restoring a visible light band image of the color channel by removing the estimated invisible light band information of the color channel from multiple band information of the color channel included in the information of the input image.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: September 15, 2015
    Assignees: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Hanwha Techwin Co., Ltd.
    Inventors: Eun-Cheol Choi, Moon-gi Kang, Hyun-mook Oh, Chul-Hee Park
  • Publication number: 20150243003
    Abstract: Provided are a method and apparatus for processing an image to remove fog from the image. The apparatus for processing an image includes: a transmission estimation unit configured to calculate a transmission of an input image by synthesizing pixel-based transmissions of current pixels of the current image including a fog component, and block-based transmissions of a plurality of blocks of a previous image, each block including a plurality of pixels; an airlight estimation unit configured to calculate airlight of the input image; and an image restoration unit configured to generate, based on the transmission and the airlight, a restored image in which the fog component is removed from the current image.
    Type: Application
    Filed: August 6, 2014
    Publication date: August 27, 2015
    Applicant: Samsung Techwin Co., Ltd.
    Inventor: Eun Cheol CHOI
  • Patent number: 8818089
    Abstract: A device and method of removing chromatic aberration which occurs in an image generated by capturing a target subject. The chromatic aberration removing device includes a chromatic aberration region detecting unit which detects a chromatic aberration occurrence region in an input image, a coefficient calculating unit which calculates a minimizing pixel value which minimizes a difference between sizes, numbers of pixels or intensities of edges of red, green, and blue (RGB) channels of the chromatic aberration occurrence region, a chroma signal processing unit which removes chromatic aberration in the chromatic aberration occurrence region, and a purple fringing removing unit which removes purple fringing.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: August 26, 2014
    Assignees: Samsung Techwin Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Eun-Cheol Choi, Jae-Cheol Lee, Moon-gi Kang, Hee Kang
  • Publication number: 20140218538
    Abstract: Provided is an image fusion apparatus using a multi-spectral filter array sensor, the image fusion apparatus including a separation unit configured to separate an input image input through the multi-spectral filter array sensor into an RGB image and a near infrared (NIR) image, a color reconstruction unit configured to extract an RGB image in a visible band by removing an NIR value incident together with R, G and B values through the multi-spectral filter array sensor from the R, G and B values, and an image fusion unit configured to fuse the RGB image in the visible band with the NIR image, in which a fusion rate of the RGB image and the NIR image is based on a size of each of the R, G and B values of the RGB image in the visible band.
    Type: Application
    Filed: July 30, 2013
    Publication date: August 7, 2014
    Applicant: SAMSUNG TECHWIN CO., LTD.
    Inventor: Eun-Cheol CHOI
  • Publication number: 20140169671
    Abstract: Provided is a method and apparatus for restoring color of an input image. The method includes: separating multiple band information of a near infrared (NIR) channel from information of the input image by using a correlation between a color channel and the NIR channel in the input image; obtaining estimated invisible light band information of the NIR channel from the multiple band information of the NIR channel and estimated multiple band information of the NIR channel which is estimated from the color channel; estimating invisible light band information of the color channel based on the estimated invisible light band information of the NIR channel; and restoring a visible light band image of the color channel by removing the estimated invisible light band information of the color channel from multiple band information of the color channel included in the information of the input image.
    Type: Application
    Filed: July 23, 2013
    Publication date: June 19, 2014
    Applicants: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, SAMSUNG TECHWIN CO., LTD.
    Inventors: Eun-Cheol CHOI, Moon-gi KANG, Hyun-mook OH, Chul-Hee PARK
  • Publication number: 20130329101
    Abstract: A camera system with a multi-spectral filter array and an image processing method thereof are disclosed. The method of processing an image that is output from an image sensor including a multi-spectral filter array including a color filter and a near infrared (NIR) filter includes interpolating an NIR channel of the image by using spatial information of color channels including a red channel, a green channel, and a blue channel; and interpolating the color channels of the image by using spatial information of the NIR channel.
    Type: Application
    Filed: April 10, 2013
    Publication date: December 12, 2013
    Applicants: INDUSTRY-ACADEMIC COOPERATION, YONSEI UNIVERSITY, SAMSUNG TECHWIN CO., LTD.
    Inventors: Eun-Cheol CHOI, Moon-Gi KANG
  • Publication number: 20130039573
    Abstract: A device and method of removing chromatic aberration which occurs in an image generated by capturing a target subject. The chromatic aberration removing device includes a chromatic aberration region detecting unit which detects a chromatic aberration occurrence region in an input image, a coefficient calculating unit which calculates a minimizing pixel value which minimizes a difference between sizes, numbers of pixels or intensities of edges of red, green, and blue (RGB) channels of the chromatic aberration occurrence region, a chroma signal processing unit which removes chromatic aberration in the chromatic aberration occurrence region, and a purple fringing removing unit which removes purple fringing.
    Type: Application
    Filed: July 17, 2012
    Publication date: February 14, 2013
    Applicants: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, SAMSUNG TECHWIN CO., LTD.
    Inventors: Eun-Cheol CHOI, Jae-Cheol LEE, Moon-Gi Kang, Hee Kang