Achromatic: without color. Black white and gray are achromatic but called colors by artist.

无色：没有色彩。黑色，白色和灰色是无色的，但美术家却称之为颜色。

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Achromatic: Without color. Black, white and gray are achromatic, but called colors by artist.

无色：没有色彩。黑色，白色和灰色是无色的，但美术家却称之为颜色。

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The simple vector filter has simple principle that is use achromatic factor to extract traffic sign colors.

简单向量滤波器原理简单，利用单色提取因子，提取标志颜色。

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