When acquiring the pavement image, the acquired image is hard for image segmentation and recognition because of the noise and the nonuniform background illumination.
在获取路面图像中，由于背景光照不均匀以及存在着一些路面噪声，给后来的图像分割及识别带来了一些困难。
2
We need to make sure that millions of workers who are still pounding the pavement looking for jobs are not denied unemployment benefits to carry them through hard times.
我们还需要确保数百万还在艰难寻找工作的人获得失业救济，从而帮助他们渡过难关。
3
The mechanical and application condition of pavement on long span steel bridge deck is so hard that the paving material is of high requirement.