电视图象视频信号的频谱是包括直流及极低频率到6MHz各种频率随机分布的统计结果。本文用富里叶级数作论证,若从技术上采取措施,在1～5MHz范围内适当提升增益,可形成勾边的效果,使图象轮廓分明,细节清晰。并指出了实现这一结论的具体措施。 The spectrum of a video signal of a television image is a statistical result of random distribution of various frequencies including direct current and very low frequency to 6 MHz. In this paper, the use of Fourier series for demonstration, if technically take measures to properly raise the gain within the range of 1 ~ 5MHz, the effect of the formation of a hook edge, so that the image is clear, the details clear. And pointed out concrete measures to achieve this conclusion.