US Patent No. 9,208,574

METHOD AND APPARATUS FOR MEASURING ROTATION CHARACTERISTICS OF ROTATING BODY


Patent No. 9,208,574
Issue Date December 08, 2015
Title Method And Apparatus For Measuring Rotation Characteristics Of Rotating Body
Inventorship Jong Sung Kim, Daejeon (KR)
Seong Min Baek, Daejeon (KR)
Myung Gyu Kim, Daejeon (KR)
Il Kwon Jeong, Daejeon (KR)
Assignee ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)

Claim of US Patent No. 9,208,574

1. A method of measuring rotation characteristics, the method comprising:
extracting a rotating-body region from an image of a rotating body;
extracting a surface pattern of the rotating body on the basis of brightness values of pixels included in the extracted rotating-body
region; and

acquiring rotation characteristics of the rotating body on the basis of change in the extracted surface pattern,
wherein the extracting of the surface pattern comprises:
normalizing a brightness range of the rotating-body region on the basis of a minimum brightness value and a maximum brightness
value among the brightness values of the pixels included in the extracted rotating-body region;

creating an integration image by adding brightness values of pixels included in a certain portion of the normalized rotating-body
region; and

extracting the surface pattern of the rotating body on the basis of the integration image,
wherein the integration image for the certain portion has a value D(x1, y1, x2, y2) that is calculated using the following equations:


wherein G (u, v) is a brightness value of a pixel located at coordinate (u, v), I(x, y) is a value obtained by adding brightness
values of all pixels located in a region from coordinate (x0, y0) to coordinate (x, y), coordinate (x0, y0) is a coordinate of a specific point outside a surface region of the rotating body, and the certain portion is defined by
coordinate (x1, y1) and coordinate (x2, y2).