LU XIAOJING, ZHAO SHUQING. Extraction of directional construction from photograph by optical filtering[J]. Acta Optica Sinica, 1982, 2(4): 360
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The directional characteristic of some objects is analysed by means of 2D Fourier series. The Fourier coefficients have been numerically calculated for the typical objects, and by using optical filtering the objects are extracted from pictures. Then, optical directional filtering for the satellite-photograph is performed. Experimental results are given.