应用超高灵敏度的光电成像系统，获得了活体昆明鼠的超微弱生物发光图像，并用概率统计理论研究了光子图像中的光子频数分布，得到了一种去除噪声的原则。文中首次提出了用Ｘ2准则拟合实际图像中的信号区和背景区分布，并根据得到的统计估计值对光子图像进行处理的方法。该法对实验获得的昆明鼠的超微弱生物发光有较好的处理效果，提高了图像的信噪比，得到了好的观察效果。

An ultra sensitive imaging system was developed and used to obtain the ultra weak builuminescence image of a living Kunming mouse, and statistical analysis was used for studying photon frequency distribution. In this paper, for the first time we use X 2 ruler to calculate the signal photon and background photon distribution parameters for the image processing. It has been proved that this method is effective in processing the ultra weak bioluminescence images. The S/N ratio is increased and the image quality is improved.