A black card is just a regular cardboard paper. The key point is the color black. Black absorbs light. Therefore, the camera will not capture the black card.
黑卡，就是一般的纸，重点是要黑色，黑色会吸光，如此相机才不会拍摄出这片卡的颜色。
In this paper, we study and analyse the black line recognition and the corresponding control strategy based on the camera.
本文研究分析了基于摄像头的黑线识别以及相应的控制策略。
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