Abstract: The present disclosure discloses a method for automatically identifying south troughs by improved Laplace and relates to the technical field of meteorology. The method includes the following steps: acquiring grid data of a geopotential height field; calculating a gradient field of the geopotential height field in an x direction; searching for a turning point where a gradient value turned from being negative to being positive, and cleaning the gradient field; calculating a divergence of the x direction to obtain an improved Laplacian numerical value L?; performing 0,1 binarization processing on the L? to obtain a black-and-white image and a plurality of targets of potential troughs, merging the black-and-white image and the plurality of targets of the potential troughs by expansion, recovering original scale through erosion, and selecting an effective target through an angle of direction of a contour and an axial ratio.

Abstract: A light curing device comprises a conveyor belt and a light source provided above the conveyor belt. A positioning block is provided on at least a portion, which is parallel to a conveying direction of the conveyor belt, of a carrying surface of the conveyor belt, and the positioning block includes a positioning surface which is perpendicular to the carrying surface of the conveyor belt and extends along the conveying direction of the conveyor belt. The positioning surface is configured to position an object to be conveyed.