Patents by Inventor Takayuki Erikawa

Takayuki Erikawa 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).

  • Optimized lighting method for slider serial reading using class variance
    Patent number: 7574046
    Abstract: Embodiments of the invention provide a method for setting a light source parameter in order to recognize an identification mark on an object surface. In one embodiment, a grayscale image is generated by setting the light volume of the light source to a given value. Plural thresholds each for binarizing the grayscale image in density are set. The inter-class variance values to be produced respectively according to the thresholds are calculated and the largest inter-class variance value is selected as the peak inter-class variance value from the inter-class variance values calculated. The light volume is changed to a plurality of different values. Peak inter-class variance values are obtained respectively for the values and the largest peak inter-class variance value is selected as the maximum inter-class variance value from the peak inter-class variance values obtained.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: August 11, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yohtaroh Ichimura, Shinichi Iwasa, Takayuki Erikawa, Yukihiro Nakamura
  • Optimized lighting method for slider serial reading using class variance
    Publication number: 20060126934
    Abstract: Embodiments of the invention provide a method for setting a light source parameter in order to recognize an identification mark on an object surface. In one embodiment, a grayscale image is generated by setting the light volume of the light source to a given value. Plural thresholds each for binarizing the grayscale image in density are set. The inter-class variance values to be produced respectively according to the thresholds are calculated and the largest inter-class variance value is selected as the peak inter-class variance value from the inter-class variance values calculated. The light volume is changed to a plurality of different values. Peak inter-class variance values are obtained respectively for the values and the largest peak inter-class variance value is selected as the maximum inter-class variance value from the peak inter-class variance values obtained.
    Type: Application
    Filed: December 15, 2005
    Publication date: June 15, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yohtaroh Ichimura, Shinichi Iwasa, Takayuki Erikawa, Yukihiro Nakamura