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把摄像头设置为RGB565模式之后，如何把得到的图像进行灰度化。（并不是
一开始就设置为sensor.GRAYSCALE）
查了文档发现好像没有将彩色图转换为灰度图的函数？
https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.to_grayscale