This paper presents an efficient visibility method based on OpenGL in large-scale urban environment. Due to the full 3- D environment of macro cell, visibility judge will contain huge amount of buildings and environment information, which means extremely high computation time for traditional method. The model established by accurate digital map, depth test and color buffer is used here to assist in visibility judge, which the location and the height of antenna are of great important. This method is suitable for three-dimensional simulations.
Based on the study of measures of the algorithm casting
defect lossless examination and characteristics of X-ray
imaging, a new automatic detection based on SURF is
presented. Firstly, the algorithm detects the interested
points of specifically component model in the standard
image samples by SURF. Then the interested points of
inspection produce are detected when the rotary
worktable makes one revolution, at the same time, the
interested points between model and produce are matched.
The number of matched points is the basis for whether
the product contains the component. Experimental results
show that this method is effective in determining the
component model well or not, which provides a novel
method for casting defect lossless examination.
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