然后软件会大大降低经过剪裁的图像的分辨率，降低到仅有40个像素乘以40个像素的水平（像素太高的话数据库就会非常大）。
Then the software drastically reduces the resolution of the cropped image, to only 40 pixels by 40 pixels.
在大量实验分析的基础上提出了剪裁图像和局部阈值判断的方法，较好的补偿了谱线图像倾斜弯曲带来的影响。
Clipping the image and judging local threshold are put forward by a lot of experimental analysis, and it works to compensate the influence lead-in by gradient and bended spectral pattern.
通过经典的图像水印系统对比实验证明了双混沌置乱能提高水印安全性和抗剪裁攻击攻击性能。
Through the classic image watermarking system contrast experiment, it proved that double chaos scrambling can enhance security and boost anti-offensive.
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