我设置相机使环境光曝光正确，接着使用闪灯并调低曝光补偿进行补光。
I set my camera to expose for ambient light, and then used flash which I dialed down.
在自然光线不足(阴雨、夜晚)的逆光情况下，要得到较为理想的车牌图像，需要进行人工补光。
In the condition of that when the light is insufficient (such as in the cloudy day or in the night), we can meet the backlighting problem.
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