Patents by Inventor Xun Yuan

Xun Yuan 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: 8792016
    Abstract: An image processing apparatus that performs individual optimum image processing on each of a portion of an image illuminated by a light source and a portion of the image shaded from the light source, an image pickup apparatus, an image processing method, and a computer program are provided.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: July 29, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Haike Guan, Tao Li, Xun Yuan
  • Patent number: 8655060
    Abstract: A night-scene light source detecting device includes a pixel value obtaining unit configured to obtain a pixel value of each pixel in an input image; a night-scene-feature extraction unit provided for extracting a zone area of a mean corrected-brightness value and a high corrected-brightness value of the input image as two night-scene features based on the pixel value of each pixel in the input image; a night-scene image detection unit provided for determining whether the input image is a night-scene image or not based on the two night-scene features; a specific color detection unit provided for detecting whether each pixel belongs to specific color or not; and a night-scene light source determining unit provided for determining whether the night-scene image is picked up under irradiation by the specific light sources in a night scene or not based on the result of the specific color detection.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: February 18, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Xun Yuan, Zhongchao Shi, Cheng Zhong, Tong Liu, Gang Wang
  • Patent number: 8488878
    Abstract: Disclosed is a sky detection system that detects sky in an image collection device. The system includes an image collection unit that collects information of a color image; a color-feature extraction unit that extracts a color feature of each pixel from the collected image; a distance measurement unit that measures a distance between each pixel of the collected image and a lens; a first classification unit that classifies each pixel of the collected image as either a sky pixel or a non-sky pixel based on the color feature; and a second classification unit that further classifies each pixel of the collected image as either the sky pixel or the non-sky pixel based on the distance and a result of the first classification unit.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: July 16, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Xun Yuan, Tao Li, Gang Wang, Zhongchao Shi
  • Patent number: 8295606
    Abstract: A device for detecting a shadow region in an image includes an imaging module generating a multi-channel image including brightness, red, green, and blue channels, a brightness correcting module correcting values of the brightness channel based on imaging parameters and outputting a corrected multi-channel image, a scene classifying module determining to carry out a shadow detection on the corrected multi-channel image, a shadow detecting module classifying pixels of the corrected multi-channel image into a shadow or non-shadow pixel, and generating a shadow classification mark matrix having pixels having a shadow classification mark value corresponding to the classification, a region segmentation module segmenting the multi-channel image into regions having pixels having similar color values, and generating a region mark matrix having pixels having a region mark value, and a post-processing module updating the shadow classification mark matrix based on the shadow classification mark matrix and region mark ma
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: October 23, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tao Li, Xun Yuan, Gang Wang, Zhongchao Shi
  • Publication number: 20120170839
    Abstract: A night-scene light source detecting device includes a pixel value obtaining unit configured to obtain a pixel value of each pixel in an input image; a night-scene-feature extraction unit provided for extracting a zone area of a mean corrected-brightness value and a high corrected-brightness value of the input image as two night-scene features based on the pixel value of each pixel in the input image; a night-scene image detection unit provided for determining whether the input image is a night-scene image or not based on the two night-scene features; a specific color detection unit provided for detecting whether each pixel belongs to specific color or not; and a night-scene light source determining unit provided for determining whether the night-scene image is picked up under irradiation by the specific light sources in a night scene or not based on the result of the specific color detection.
    Type: Application
    Filed: December 21, 2011
    Publication date: July 5, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Xun Yuan, Zhongchao Shi, Cheng Zhong, Tong Liu, Gang Wang
  • Publication number: 20120114250
    Abstract: Disclosed are a system and a method for detecting a multi-view human face. The system comprises an input device configured to input image data; a hybrid classifier including a non-human-face rejection classifier configured to roughly detect non-human-face image data and plural angle tag classifiers configured to add an angle tag into the image data having a human face; and plural cascade angle classifiers. Each of the plural cascade angle classifiers corresponds to a human face angle. One of the plural cascade angle classifiers receives the image data with the angle tag output from the corresponding angle tag classifier, and further detects whether the received image data with the angle tag includes the human face.
    Type: Application
    Filed: October 21, 2011
    Publication date: May 10, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Cheng ZHONG, Xun Yuan, Tong Liu, Zhongchao Shi, Gang Wang
  • Publication number: 20110298946
    Abstract: An image processing apparatus that performs individual optimum image processing on each of a portion of an image illuminated by a light source and a portion of the image shaded from the light source, an image pickup apparatus, an image processing method, and a computer program are provided.
    Type: Application
    Filed: January 19, 2010
    Publication date: December 8, 2011
    Inventors: Haike Guan, Tao Li, Xun Yuan
  • Publication number: 20110221933
    Abstract: Disclosed are a backlight detection device and a backlight detection method. The device comprises a pixel value acquiring unit used to acquire a pixel value of each of pixels in an image; a focal position determination unit used to determine a focal position in the image; a subject area determination unit used to determine, based on the pixel values of the pixels in the image, a subject area starting from the focal position by using an area growth processing so as to divide the image into the subject area and a background area; a brightness difference calculation unit used to calculate a brightness difference between the subject area and the background area; and a backlight determination unit used to determine, based on the brightness difference, whether the image is in the backlight state so that the image in the backlight state can be detected.
    Type: Application
    Filed: January 7, 2011
    Publication date: September 15, 2011
    Inventors: Xun Yuan, Zhongchao Shi, Cheng Zhong, Tong Liu, Gang Wang
  • Publication number: 20110194779
    Abstract: Disclosed are an apparatus and a method for determining a multi-view specific object. The apparatus comprises an input device for inputting image data; and cascade classifiers formed of stage classifiers corresponding to a same detection angle, the stage classifiers corresponding to different features. Each cascade classifier is for calculating a degree of confidence of the image data of a specific object corresponding to the detection angle based on the aspect of the corresponding feature, and determining whether the image data belongs to the specific object based on the degree of confidence. A self-adaptive posture prediction device is disposed between two stage classifiers in each cascade classifier, and is used to determine whether the image data enters the cascade classifiers corresponding to the detection angles and located after the self-adaptive posture prediction device.
    Type: Application
    Filed: December 15, 2010
    Publication date: August 11, 2011
    Inventors: Cheng ZHONG, Zhongchao Shi, Xun Yuan, Tong Liu, Tao Li, Gang Wang
  • Publication number: 20100322510
    Abstract: Disclosed is a sky detection system that detects sky in an image collection device. The system includes an image collection unit that collects information of a color image; a color-feature extraction unit that extracts a color feature of each pixel from the collected image; a distance measurement unit that measures a distance between each pixel of the collected image and a lens; a first classification unit that classifies each pixel of the collected image as either a sky pixel or a non-sky pixel based on the color feature; and a second classification unit that further classifies each pixel of the collected image as either the sky pixel or the non-sky pixel based on the distance and a result of the first classification unit.
    Type: Application
    Filed: June 3, 2010
    Publication date: December 23, 2010
    Inventors: Xun Yuan, Tao Li, Gang Wang, Zhongchao Shi
  • Publication number: 20100232705
    Abstract: A device for detecting a shadow region in an image includes an imaging module generating a multi-channel image including brightness, red, green, and blue channels, a brightness correcting module correcting values of the brightness channel based on imaging parameters and outputting a corrected multi-channel image, a scene classifying module determining to carry out a shadow detection on the corrected multi-channel image, a shadow detecting module classifying pixels of the corrected multi-channel image into a shadow or non-shadow pixel, and generating a shadow classification mark matrix having pixels having a shadow classification mark value corresponding to the classification, a region segmentation module segmenting the multi-channel image into regions having pixels having similar color values, and generating a region mark matrix having pixels having a region mark value, and a post-processing module updating the shadow classification mark matrix based on the shadow classification mark matrix and region mark ma
    Type: Application
    Filed: February 4, 2010
    Publication date: September 16, 2010
    Inventors: Tao Li, Xun Yuan, Gang Wang, Zhongchao Shi