本文提出一种新方法——密度矩和法，用底片上已知亮度恒星的PDS测微密度数据来同时决定底片特性曲线和星等零点。
A new method is suggested for determining the characteristic curve of a plate, as well as the magnitude zero point, using PDS microdensitometer data of stars of known brightness on the plate.
并可进一步作出光谱图像的等密度轮廓曲线和三维立体图形，大大提高了光谱底片数据处理的效率和精度。
In addition, the contour and 3D graph deduced from the image can also be produced. This code can greatly improve the efficiency and precision in film image data processing.
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