求星图中星象坐标的matlab函数，输入星图，利用交叉投影方法得到星象所在区域的四个顶点坐标和星象的质心，能够快速的求得星图星象的位置信息-Astrology chart for stars matlab function of the coordinates, enter the star maps, cross-projection method using astrology region and the four vertex coordinates of the mass center