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。
The mean value of gradient magnitude in the regions, of which size is equal to ear, is computed by the extracting ROI method.
ROI提取方法计算人耳大小区域的梯度均值，通过设定合适的阈值得到较少的候选区域。
The images gradient magnitude mean and the variance of every pixel in the image relative to the gradient magnitude mean are calculated according to the method proposed in the paper.
针对传统分水岭变换对图像进行分割时常见的过度分割情况，提出了利用先验知识对梯度幅度图像进行处理的方法。
Image restoration is an important research subject in image processing. Image gray or gradient magnitude is used in most of image restoration algorithm and spatial information is not adopted.
图像复原是图像处理中一个重要的研究课题。大部分图像复原算法，都只是单纯地利用图像灰度或梯度信息，并没有考虑图像的空间结构信息。
Even if the pressure gradient is partly balanced by the fluid acceleration, its order of magnitude is usually no larger than the hydrostatic gradient.
即使压强梯度部分地被流体加速度平衡，其数量级通常也不大于静压梯度。
In high speed drawing process, the pressure gradient of coating in die determines the magnitude of centering force and the concentricity of coating layers.
高速拉丝过程中，模具中涂料的压力梯度决定了对中作用力和光纤涂层同心度的大小。
The ratio of the magnitude of an applied shear stress to the velocity gradient that it produces; that is, a measure of a noncrystalline material's resistance to permanent deformation.
剪切应力数值与其产生应变速率的比值叫粘性，用来衡量非晶材料抵抗永久变形的能力。
The ratio of the magnitude of an applied shear stress to the velocity gradient that it produces; that is, a measure of a noncrystalline material's resistance to permanent deformation.
剪切应力数值与其产生应变速率的比值叫粘性，用来衡量非晶材料抵抗永久变形的能力。
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