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11·1 信号传递函数和动态范围我们把热成象系统定义为能把远红外光辐射转换成可见光的一种装置。这样就能从所得到的图象中提取信息。这种转换的功率增益基本上可用视频监控器的“对比度”控键控制,并用“亮度”控键叠加上一个任意直流电平。我们应能描述和测量这种功率转换及其与调制的相互关系,以保证使观察人员能用调控键来优选信息的提取能力。这就是说,这样就能取得满意的外界环境因素,产生噪声限图象和高对比度的图象。为了方便起见,只测量大的矩形目标图象中一个点的输入—输出功率转换。输入功率以系统热谱带范围内测得的目标与背景之间的有效黑体温差的百分数表示,输出功率一般是以
11.1 Signal Transfer Function and Dynamic Range We defined a thermal imaging system as a device that converts far-infrared light radiation into visible light. This will extract the information from the resulting image. The power gain for this conversion is basically controlled by the video monitor's Contrast control key and superimposed on an arbitrary DC level with the Brightness control key. We should be able to describe and measure this power conversion and its interrelationship with modulation to ensure that observers can use control keys to optimize the extraction of information. This means that, in this way, satisfactory external environmental factors can be achieved, producing noise-limited images and high-contrast images. For convenience, only input-output power conversion at one point in a large rectangular target image is measured. The input power is expressed as a percentage of the effective black body temperature difference between the target and the background measured in the system's hot band range and the output power is generally