CONTROL OF BRIGHTNESS OF TEXT/GRAPHICS OVERLAY

摘要

In accordance with the principles of the present invention, the above and other objects are realized in an apparatus and method for superimposing text information on a video background signal. The apparatus includes means to input the video background signal (1), a text generator (19) for generating a text signal containing the text information to be superimposed on the video background signal, and automatic contrast circuit means (15) for selectively controlling the brightness of the text signal to maintain at least a predetermined minimum contrast between the brightness of the text signal and the brightness of the video background signal as the brightness of the video background signal varies.