yolov5读取灰度图

YOLOv5在读取灰度图时，会将图像的灰度值复制三次，使其变为三通道的图像。这是因为OpenCV在默认情况下会读取三个通道的图像，如果图像是灰度图，就会将图层复制三次，使其与RGB图像有相同的通道数。这样做的目的是为了保持代码的一致性，方便后续的处理和计算。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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