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How Self-Driving Cars Detect Road Signs
自动驾驶汽车如何识别交通标志
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Self-driving cars use cameras to watch the road ahead.自动驾驶汽车依靠摄像头观察前方道路。
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Special software scans images for shapes and colors of signs.专用软件扫描图像，识别交通标志的形状和颜色。
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Stop signs are red octagons with white letters.停车标志是红底白字的八边形。
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Speed limit signs are white rectangles with black numbers.限速标志是白底黑字的长方形。
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The car's computer matches each sign to its meaning instantly.汽车电脑即时将每个标志匹配到其对应含义。
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This helps the car slow down or stop at the right time.这有助于汽车在恰当时机减速或停车。
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No human driver needs to read the sign first.无需人类驾驶员先阅读标志。
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Cameras work even in daylight and light rain.摄像头在白天和小雨中均能正常工作。