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Verify the VideoCaptureDevice is not null and the device is started.
而且装置的状态是否已启动。
youdao
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The calibration device shall be set to zero before calibration is started.
校准设备应设置到零，校准开始前。
youdao
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The calibration device shall be set to zero before calibration is started.
校准设备应设置到零，校准开始前。
youdao