The Aplication of Low-pass Filtering to pretreatment in Thermal Wave NDT

摘要：

The contrast is low, and the noise is strong in infrared images, which go against defects judgment and recognition. In order to resolve those, limitations of common methods were analyzed. Then, on this basic, grayscale value adjustment method and low pass filter method was proposed to be introduced. Image enhancement steps were designed and thermal image was processed in grayscale value adjustment method and low pass filter method in turn. In process of image enhancing, the index selection was studied in gray value adjustment method. And the effect was ideal, when it was 3. After that, the infrared image was treated in ideal low-pass filter, Butterworth low-pass filter and index low-pass filter. Contrasted effects of these methods, smooth effect would be the best in using index low-pass filter. After image processing, comparing the original image and processed image, it could be found that enhancing effect was good, which verify the validity of this method. And an effective way was designed for heat waves image enhancement.

关键词： Image enhancement The gray value adjustment act The Low-pass filtering method

作者: HE Fu-jun HAN Kui-xia

作者单位: Department 201 Tech Research Inst. of Qingzhou City Qingzhou City, Shandong Province, China Department xxx Tech Research Inst. of Qingzhou City Qingzhou City, Shandong Province, China

会议类型: 国际会议

会议名称: 2012 International Conference on Measurement,Information and Control(2012测量、信息与控制国际会议 ICMIC2012)

会议地点: 哈尔滨

会议语种:英文

页码: 590-594

在线出版日期: 2012-05-18（万方平台首次上网日期，不代表论文的发表时间）