| 摘要 |
A color balance circuit for a video camera bases red and blue gain adjustments on the ratios of red and blue light to green light in the scene. Before sequentially integrating red, green and blue light for the color balance calculation, certain process parameters are prescaled for the level of scene illumination. In particular, the integration reference voltage and the clock frequency of the time base (timing the integration) are scaled according to the level of green light so that subsequent integration of expected light levels yields results in the midrange capacity of the integrator.
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