The dynamic range of brightness on road scenes is very wide because of the lighting condition which dynamically varies with various weather and road conditions. However, the dynamic range of conventional video cameras is insufficient to input the images of road scenes. Consequently, we have developed a method of expanding the dynamic range of video cameras. Also, we have developed an experimental vision sensor system with a wide dynamic range based on the method applicable to vision systems for vehicles. The effectiveness of this sensor system was confirmed from the experiments on highways under various lighting conditions.

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