University of Electronic Science and Technology of China

Xiaoqing Li

Guiyun Tian

Bin Gao

A method automatically separates out the defect image from a thermogram sequence based on the physical characteristics of the defect of a conductive material in electromagnetic field. Defect area radiates more heat than other area, when it is mapped to the histogram of the image to be separated, the defect area is located in the top-end of histogram, and the proportion of defect area is smaller to the background or other area. The method equally divides the histogram of the image to be separated into multi groups, and calculates the first derivative kof total pixel number Sof group i, finds the maximum absolute value of k, i.e. |k|, where i is expressed as i; if iis the last group, Wis regarded as threshold T, otherwise, Wis selected as threshold T. The pixels that less than threshold T are removed to obtain the defect image in ECPT.

Growing community of inventors

Chengdu, China

Xiaoqing Li