CAJ | 학술논문

本文针对 PSI（Pixel Shape Index，PSI）算法存在的弊端，对其加以改进，并提出了一种改进型 PSI 算法。相比原算法，新算法的改进主要体现在：①在方向线生成阶段，为了充分考虑不同波段光谱特征的同质性存在的差异，每个波段数据层方向线的生成分开独立进行，这提高了方向线生成的合理性；②提出了每一条方向线长度为各波段数据层的方向线长度的加权和，以进一步体现不同波段光谱特征之间同质性上存在的差异，从而提高像元（尤其是边缘处的像元）PSI 值的准确性。最后，通过实验证明：影像分割时，联合改进型 PSI 派生波段，能有效提高外形规则的人工地物的分割精度，“边缘效应”明显减少。
본문침대 PSI（Pixel Shape Index，PSI）산법존재적폐단，대기가이개진，병제출료일충개진형 PSI 산법。상비원산법，신산법적개진주요체현재：①재방향선생성계단，위료충분고필불동파단광보특정적동질성존재적차이，매개파단수거층방향선적생성분개독립진행，저제고료방향선생성적합이성；②제출료매일조방향선장도위각파단수거층적방향선장도적가권화，이진일보체현불동파단광보특정지간동질성상존재적차이，종이제고상원（우기시변연처적상원）PSI 치적준학성。최후，통과실험증명：영상분할시，연합개진형 PSI 파생파단，능유효제고외형규칙적인공지물적분할정도，“변연효응”명현감소。
Aiming at the defects of the Pixel Shape Index (PSI)algorithm,this paper proposed an improved PSI algorithm. The main advantages of the new algorithm are listed as follows:(1 )In order to enhance the rationality of direction line generation,the differences existed in the spectral homogeneity between the bands had been considered adequately.The direction line on each band layer was extended independently.(2 )The length of every direction line was obtained by weighting the lengths of all the direction lines along the same orientation on all band layers.The differences existed in the spectral homogeneity between the bands were further reflected by this way,and the accuracy of PSI about each pixel (especially the edge pixel)was improved.The experimental results showed that the segmentation accuracy of artificial feature with regular shape was improved effectively by combining with the improved PSI derived band during the image segmentation.The “edge effect"phenomenon had been depressed significantly.