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。
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。
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。
Black, white and gray are achromatic, but called colors by artist.
黑色，白色和灰色是无色的，但美术家却称之为颜色。
Black, white and gray are achromatic, but called colors by artist.
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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