在彩电亮度通道中,我们经常听到或看到“勾边”电路,那么,何谓“勾边”?如何实现“勾边”(勾边电路)? 1.何谓“勾边”? 所谓的“勾边”指的是图像轮廓补偿的形象化叫法,故又称为“图像轮廓校正”。大家知道,在电视图像(黑白信号)中,经常会出现黑白界限分明(“硬”边)的情节,反映在亮度(黑白)信号中,就是幅度急剧变化的“突变”信号。这种信号中,包含了丰富的高频成份。亮度信号是由全电视信号通过4.43 MHz陷波电路(X201)吸收彩色信号后形成 In the color TV brightness channel, we often hear or see the “hook” circuit, then what is “hook”? How to achieve “hook” (hook circuit)? 1. What is “hook”? The so-called “ Crochet ”refers to the image contour compensation visualization, it is also known as“ image contour correction. ” As we all know, in TV images (black and white signals), there are often episodes of clearly defined black and white (“hard” edges) that are reflected in the brightness (black and white) signals as “abrupt” signals of sharp changes in amplitude. This signal contains a wealth of high-frequency components. Brightness signal is formed by the full TV signal through the 4.43 MHz notch circuit (X201) to absorb color signals