gradient threshold 梯度临界值
gradient threshold value 梯度阈值分割
threshold pressure gradient 启动压力梯度
threshold gradient 阈值梯度
threshold pressure gradient tpg 启动压力梯度
Pseudo threshold pressure gradient 拟启动压力梯度
seepage threshold pressure gradient 渗流启动压力梯度
Then, the best threshold value is calculated basing on the gradient magnitude mean and the variance of the image.
再由图像的梯度幅值均值和方差计算出图像的最佳阈值。
In order to remove the residual noise which can not be smoothed by filter, the smoothing coefficient and constrain coefficient were used to threshold the gradient image.
为了消除噪声残留，引入了平滑系数与限制强度系数对梯度图作阈值化处理。
Combining the two essential characteristics of the image, the gradient and the gray level, a threshold segmentation approach using maximum entropy with the gradient boundary control was proposed.
结合梯度和灰度这两种图像的本质特征，提出一种基于边界梯度控制的最大熵阈值分割方法。
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