Infrared radiation and bicolor ratio are studied in the paper.The gray and space feature of infrared quasi imaging is analyzed. 研究了紅外雙色輻射特性和雙色比識別特徵，分析了紅外亞成像的灰度與空域特徵。
The separability of multiple targets is increased by maximizing the mutual information between the characteristics of the target and the feature extracted. 該方法通過最大化識別特徵與目標特性之間的互信息以達到增加各類目標可分性的目的。
