Multi-cropping optimized and cropping density increased in wave.

作物复种方式不断优化，复种指数呈波动式增长。

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For example, the farmland of winter wheat should be reduced in northern China, while southern China, rich in water resources, should maintain multi-cropping.

例如，中国北方的冬小麦农田应该减少，而在水资源丰富的中国南方应该维持多茬复种。

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We test the algorithm performance in the cases of single watermark, double watermarks and multi watermarks when different distortions such as JPEG compression, image resizing and cropping are applied.

该文就单水印，双水印以及多水印情形进行了仿真并进行JPEG压缩、图像缩放、剪切等失真测试。

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