In the new energy model, the homogeneity of a target and its area ratiotobackground was pay attention to.
针对这一问题给出了改进的拟合能量模型，新模型兼顾到了目标的同质性信息与其所占面积比例的关系。
2
The invention relates to a target source with adjustable contrast ratio. The target of the target source is arranged between target integrating sphere and background integrating sphere;