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在光电技术、图象处理、红外与激光技术等方面,常常涉及空间频谱以及空间滤波的问题。下面以时域信号为基础,从理论上谈谈空间频谱的特性,以及时间信号与空间信号,时间频谱与空间频谱的比较。无线电技术中的信号,都是随时间而变化的电压或电流信号,表现为一维的时间函数。它们在频域内的频谱这里称为时间频谱。而在图象处理和红外系统等方面,所遇到的信号则是空间位置的二维函数,如图象的灰度信号以及红外探测中的目标辐射与背景辐射都是空间位置的函数,它们在数学形式上都可以写为
In the photoelectric technology, image processing, infrared and laser technology, often involves the issue of spatial spectrum and spatial filtering. The following time-domain signal-based, in theory, talk about the characteristics of the spatial spectrum, as well as the time signal and spatial signal, the time spectrum and space spectrum comparison. The signals in radio technology are voltage or current signals that change over time and appear as a one-dimensional time function. Their spectrum in the frequency domain is referred to here as the time spectrum. In image processing and infrared systems, the signal encountered is a two-dimensional function of spatial position, such as the grayscale signal of the image and the target radiation and the background radiation in the infrared detection, which are both spatial locations. They are In mathematics can be written as