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本文定量地分析了行扫描仪的目标分辨能力。结果说明,其分辨能力大大超过了瞬时视场的限制。当目标或其内部亮度分布的线度小于瞬时视场的线度肘,我们能得到一种畸变了的,即被展宽而且边沿模糊了的响应。但是如果目标亮度分布的对比度足够大,这种分布就能被成象并被识别。特别是对线性甚至点目标,只要其对比度或亮度增加到S_L/S_T倍,就确定地能满足已建立的任何可识别的条件方程,这里S_L与S_T分别表示瞬时视场和目标的面积。如果进一步利用目标与背景间不同的波谱特性,还能明显地改进目标分辨能力。
This paper quantitatively analyzes the target resolution of line scanners. The result shows that its resolving power greatly exceeds the limit of instantaneous field of view. When the linearity of the target or its internal brightness distribution is less than the linear extent of the instantaneous field of view, we get a distorted, ie, widened, fuzzy edge response. However, if the contrast of the target brightness distribution is large enough, the distribution can be imaged and recognized. Especially for linear or even point targets, as long as their contrast or brightness is increased to S_L / S_T times, any identifiable condition equation that has been established can certainly be met, where S_L and S_T respectively represent the instantaneous field of view and the area of the target. If we further take advantage of the different spectral characteristics between the target and the background, we can obviously improve the target resolution.