Calculation and analysis of Hu moment of Continuous-Wave Terahertz reflecting image

Terahertz (THz) radiation can penetrate nonmetallic materials and nonpolar materials, and has low photon energy, therefore THz imaging has drawn more attention. The moment function of an image has wide applications on pattern recognition and target classification. The paper has applied image segmentation to Continuous-Wave THz point-to-point scanning reflecting image depending on Otsu's method. The Hu moments of the original image and the segmentation image were calculated, and the mean value and relative error were also obtained. It can provide technical support for THz image pattern recognition by use of moment invariants.