摘要
主动式红外热波无损探伤技术是一种新型的快速、高效的检测技术。然而,在检测过程中获取的红外图像常常受到加热不均、表面发射率不均以及环境干扰等因素的影响而导致图像质量降低,普遍存在"低对比度、高噪声"等缺点,加大了对缺陷定量识别的难度。为此,在传统的Butterworth高通滤波器的基础上,采用改进的同态增晰技术,选取合适的参数,通过多次实验,对图像进行非均匀性校正和增强处理,并对缺陷的大小、深度进行了定量识别。结果表明:该技术能够增强缺陷区域的对比度,比直方图均衡化等其他滤波增强方法具有更高的峰值信噪比,提高了图像的能量,取得了较好的效果,具有一定的工程应用价值。
Active infrared thermal wave nondestructive testing（NDT） is a kind of new-style, fast and high- effective testing technology. However, the infrared image acquired by the infrared camera in the experiment always have the problems such as low-contrast and high-noise, which are resulted from uneven heating, uneven surface emissivity and environmental disturbance. Obviously, these problems make the defects quantitative distinguished difficulty. Therefore, an improved homomorphic filtering^method was presented in this paper, which was improved on the basic of the traditional Butterworth high pass filter. The appropriate parameters were chosen to correct the non-uniformity and strengthen the raw images contrast through a great many experiments. Finally, the defects were identified quantitatively by image segmentation. The experimental results show that the homomorphic technology can enhance the contrast, and has higher peak signal to noise ratio （PSNR） comparing with the equalization method of histogram. The image quality is improved obviously. It has engineering application value.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第1期22-27,共6页
Infrared and Laser Engineering
基金
国家自然科学基金资助项目(51075390)
装备预研项目(103020303)
关键词
红外热波
加热不均匀
非均匀校正
同态增晰
infrared thermal wave
uneven heating
non-uniformity correction
homomorphic filter
