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。
2
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。
3
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.