Rainbows sometimes appear as two concentric bows with the inner one called the primary bow and the outer one the secondary bow.

彩虹有时会以两条同心圆弧形态出现。内弧称为主虹，外弧称为副虹或霓。

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The key to recognize them by computer vision is bow to detect them and identify their inner signs.

应用计算机视觉可以对交通标志进行自动识别，其关键在于如何检测交通标志和识别它们的内核形状。

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The key to recognize them by computer vision is bow to detect them and identify their inner signs.

应用计算机视觉可以对交通标志进行自动识别，其关键在于如何检测交通标志和识别它们的内核形状。

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