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我也单独设置过x_scale为-1.0，水平方向是可以翻转的。设置y_scale为1.0或者-1.0，lcd显示都没有任何变化,但是垂直方向可以进行缩放（无论正负），就是不可以翻转。
lcd.display(img,x_scale=-1.0,y_scale=-1.0)
已提交bug，会尽快修复。
https://github.com/openmv/openmv/issues/1696