Patent ID: 6404384
Filing Date: 2002-06-11
Classification: G01S

Abstract:
A method of spoke filling for radar scan converter, the method comprising:providing a sweep line plane that has a plurality of coordinate sectors and a plurality of ordered sweep lines defined thereon; selecting a first sweep line and a second consecutive sweep line that are referred to as respectively the previous sweep line and the present sweep line, wherein the first and second sweep lines have respectively a plurality of defined cartesian points, each of the defined cartesian points having a defined video value, wherein the coordinate sector, cartesian points and video value thereof of the first sweep line are stored into a memory that comprises a address variable field and data variable field that store the cartesian coordinates of the points, and a coordinate sector field that stores the coordinate sector value; comparing the coordinate sector of the second sweep line with the coordinate sector of the first sweep line to determine either a horizontal fashion spoke filing or a vertical fashion spoke filling is to be performed through; if the coordinate sector of the first sweep line is different from the coordinate sector of the second sweep line, storing the cartesian coordinate values, the coordinate sector value and the video values of the entire sweep line; then processing the next sweep line; if the coordinate sector of the first sweep line is identical to the coordinate sector of the second sweep line, determining from the coordinate sector of the first sweep line whether the comparison between each point of the first sweep line and the corresponding point of the second sweep line is performed along either a horizontal or vertical coordinate axis to obtain a coordinate difference; if the coordinate difference is greater than +1, filling all the points that are located between the cartesian point of the second sweep line and the cartesian point of the first sweep line with the video value of the second sweep line point; if the coordinate difference is smaller than âˆ’1, filling all the points that are located between the cartesian point of the second sweep line and the corresponding cartesian point of the first sweep line with the video value of the second sweep line point; if the difference is exactly equal to +1 or âˆ’1, storing the cartesian coordinate value the coordinate sector value and the video value of the point of the second sweep line into the memory to respectively update the cartesian coordinate value, the coordinate sector value and the video value of the corresponding first sweep line point; and if the difference is equal to zero, updating the video value of the corresponding first sweep line point into the maximum value between the video value of the corresponding first sweep line point and the video value of the second sweep line point.