Polarization phase-shifting technique applied to a speckle correlation interferometer using an image fiber
A digital speckle correlation interferometer using an image fiber with a polarization phase-shifting technique is studied theoretically and experimentally. The correlation fringes obtained with this interferometer provide the data for determining the out-of-plane displacement of rough objects. In this interferometer, an image fiber is used for transmitting the speckle pattern arising from the object surface to a video processing system. The speckle patterns with high spatial frequencies can be optically sampled by using the image fiber without the aliasing effect which causes the distortion of the measured phase distribution
This study aims to analyse the spatial characteristics and to draw the declining areas from the whole area of Chung-Cheong Province. For this purpose, the temporal and spatial conditions by the urban decline diagnosis indexes are utilized. Additionally, the spatial autocorrelation method was applied for extraction of those areas. The spatial autocorrelation method is one of the methods on exploring spatial characteristics and considering the spatial factors. We also adopted the concepts of economics and then discovered the characteristics of deprivation areas. In applying this method, the positively valued areas were classified as the complementary areas, and the negatively valued areas as the substitutional areas. The findings show the declining areas and the growing areas caused by the growth of periphery. This study supports the regeneration plan of Chung-Cheong Province in extracting depressed or activated areas and explaining the characteristics of those areas.