CONTROL OF BRIGHTNESS OF TEXT/GRAPHICS OVERLAY
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...
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| Format: | Patent |
| Sprache: | eng ; fre |
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| Zusammenfassung: | 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 th e 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. |
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