#Y2024 #军用
[光学系统的目标探测和识别距离](https://mp.weixin.qq.com/s/0mGQX9MdVqNGtFaRXsIG-g)
在上世纪五十年代,冷战时期美国对红外成像系统和夜视设备需求的增加。当时,研究人员需要一种定量方法来评估和比较不同成像系统的性能,以确保这些系统能够满足军事和安防的需求。
约翰逊准则由美国科学家约翰逊在进行红外成像系统研究时提出。他的工作主要是解决如何有效评估成像系统在不同任务(如探测、识别和辨别)中的性能问题。约翰逊根据实验把目标的探测问题与等效条带图案探测问题联系起来。他发现在工程实践中,有可能在不考虑目标本质和图像缺陷的情况下,用目标等效条带图案可分辨力来确定成像系统对目标的识别能力。
The minimum required resolution according to Johnson's criteria are expressed in terms of line pairs of image resolution across a target, in terms of several tasks
- Detection, an object is present (1.0 +/− 0.25 line pairs)
- Orientation, symmetrical, asymmetric, horizontal, or vertical (1.4 +/− 0.35 line pairs)
- Recognition, the type object can be discerned, a person versus a car (4 +/− 0.8 line pairs)
- Identification, a specific object can be discerned, a woman versus a man, the specific car (6.4 +/− 1.5 line pairs)
These amounts of resolution give a 50 percent probability of an observer discriminating an object to the specified level.
Additionally, the line pairs refer to lines being displayed on an interlaced CRT monitor. Each line pair corresponds to 2 pixels of a film image, or an image displayed on an LCD monitor.
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