图像融合在探测混凝土内部损伤中的应用研究

图像融合算法与融合规则是图像融合技术的关键课题。本文简单介绍了几类常用的图像融合算法,如加权平均、HIS变换、塔式变换,并对基于多分辨率小波变换的图像融合算法作了较详尽地论述。在系统阐述现有融合规则的基础上,修正了现有的基于边缘梯度与基于局部方差的融合规则,并相应地提出了修正后的融合规则。通过对一混凝土梁内部缺陷进行红外探测与图像融合的试验研究,采用图像融合定性与定量评价,证明了本文修正后的基于边缘梯度与局部方差的融合规则的有效性和普遍适用性。

Application of image fusion technology in detecting interior damage of concrete beams

Image fusion algorithms and fusion rules are important for image fusion technology.In this paper,several image fusion methods,such as weighted averaging,HIS transform as well as pyramid transform are briefly discussed.The wavelet transform algorithm based on multi-resolution analysis is expounded in detail.In addition,current edge gradient and local variance rules are proved to be improper.Two kinds of modified fusion rules are proposed.An experiment of detecting interior damage of concrete beams by infrared thermography,is also carried out.The result shows that the two regional fusion rules proposed by the paper have generalized applicability and they are superior to other fusion rules on the ground of qualitative and quantitative experimental analysis.