Contour furrows overcome this problem because they are placed on a gradient of about 0.5 % across the main slope.
等高沟克服了这个问题，因为这些沟垂直于主坡方向布置，沟道坡度约为0.5%。
Secondly, for the image edge detection, methods including the gradient method, the sharp-processing method, and the Hough transformation were used, and the contour tracing was also conducted.
边缘检测处理部分采用了梯度处理法、锐化处理法、哈夫变换处理法，并对图像作轮廓跟踪处理。
Two observation models (color and gradient) targeting the head contour are added to work together with the face detector in head tracking.
在人脸跟踪扩展为头部跟踪时，加入两个针对头部的观测模型(彩信息和轮廓信息)与人脸检测器共同指导跟踪。
It calculates the gradient information of an input image as the reference image, which reduces the most inner details of the reference image but emphases its contour information.
计算输入图像的梯度值，减少了图像的内在信息而使轮廓更为清晰。
At the same time, how to get the approximate road hollow position is solved to realize the road contour extraction by gradient vector flow model with iterative solution.
通过梯度矢量流模型迭代求解，解决道路凹陷位置逼近问题，最终实现道路提取。
At the same time, how to get the approximate road hollow position is solved to realize the road contour extraction by gradient vector flow model with iterative solution.
通过梯度矢量流模型迭代求解，解决道路凹陷位置逼近问题，最终实现道路提取。
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