公开(公告)号：US4506289A

公开(公告)日：1985-03-19

申请号：US435293

申请日：1982-10-19

申请人： Toshiaki Shirakami

发明人： Toshiaki Shirakami

IPC分类号： H04N9/75 ,  H04N9/539

CPC分类号： H04N9/75

摘要： A chroma-key signal generator is provided which may be utilized to effect an electronic insertion of a picture into another picture, by utilizing a color television signal. The generator includes a first color selection/clip circuit which selects any desired hue signal from three primary color signals and clips it at a given level to provide a first key signal, a second color selection/clip circuit which selects a hue signal of a different hue from the first mentioned hue signal, from the three primary color signals, and clips it at a given level to provide a second key signal, and a logical and arithmetic circuit which logically operates on the first and the second key signal to provide an output signal which is utilized as a key signal.

摘要翻译： 提供了色键信号发生器，其可以通过利用彩色电视信号来利用图像电子插入到另一图像中。 发生器包括第一颜色选择/剪辑电路，其从三原色信号中选择任何期望的色调信号，并将其以给定的水平进行剪辑以提供第一键信号;第二颜色选择/剪辑电路，其选择不同的色调信号 来自第一提到的色相信号的色调，来自三原色信号，并将其剪辑在给定的水平以提供第二键信号，以及逻辑和运算电路，其在第一和第二键信号上逻辑地操作以提供输出 信号被用作关键信号。