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设备是H7 Plus，openmv里的的这个sensor.set_pixformat(sensor.GRAYSCALE)是把RGB565转成灰度图像了吗？ 还是摄像头在捕获图像时直接以灰度模式工作？为什么用GRAYSCALE的帧率比用RGB565的帧率波动还大（虽然画面稳定的情况下都是50左右，但是晃动的话灰度的帧率降低的比彩色的多。）？
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