In the improved algorithm, the pre-processed image is smoothed and the proper gradient threshold is set to prevent the generation of insignificant regions.
该改进算法在预处理阶段对图像进行平滑操作并设置适当的梯度阈值，即减少了梯度图像中非重要区域的产生。
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。
The method is presented to determine formation average pressure and boundary pressure with threshold pressure gradient and injection-production ratio.
给出了考虑注采比和启动压力梯度的平均地层压力和边界压力的确定方法。
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。
Aiming at characteristic differences of background and target, four-direction gradient is extracted out and areas with large gradient are smoothed by a linear threshold filter.
针对复杂背景及目标的分形特性差异，提取图像四个方向的灰度梯度，选择最小梯度大于阈值的区域进行平滑滤波，最后对分维参数进行分段线性拉伸。
This article has introduced an improved algorithm variable difference threshold value which is based on gradient.
文章介绍了一种改进的基于斜率的可变差分阈值算法。
The influences of threshold pressure gradient, vertical heterogeneity, subzone thickness and areal sand thickness distribution on development of low-permeability heterogeneous reservoirs are analyzed.
根据低渗透非均质油藏的特点，分析了启动压力梯度、纵向非均质性、小层厚度和平面砂体厚度展布对该类油藏开发的影响。
The spread range gets smaller because of threshold pressure gradient, and there will be a additional pressure drop in the bottom of the well because of the skin damage.
启动压力梯度使压力波传播范围变小，井底污染会造成一个附加压力降。
The threshold pressure gradient of low permeability sandstone was studied experimentally by measuring the pressure attenuation in an unsteady seepage flow.
为了研究低渗透砂岩的启动压力梯度，设计了一种非稳态渗流中测量压力的试验方法。
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。
The optical refraction threshold. birefringent gradient and extinction ratio were measured.
测试了晶体的光折变阈值、双折射梯度和消光比。
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.
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。
In this scheme, the inputs of hidden layer neurons are acquired by using the gradient descent method, and the weights and threshold of each neuron are trained using the linear least square method.
在该方案中，通过梯度法获取隐层神经元的输入，使用线性最小二乘法训练各神经元的权值和阈值。
The experiments show that microbe solution flooding can decrease the threshold pressure gradient, lessen the flow resistance, and extend the effective drainage distance.
与水驱相比，微生物驱油可降低启动压力梯度，降低渗流阻力，扩大有效驱动距离。
We use gradient algorithm to enhance cell borders in improving the edge detection algorithm. We achieve a better result through application adaptation threshold algorithm and mathematical morphology.
在改进的边缘检测算法中，本文运用梯度算法对图像进行边缘增强，然后应用最佳阈值算法与形态学方法，取得较好的分割效果。
Based on the flow equation concerned on threshold pressure gradient and deforming media, this paper productivity equation and IPR forecasting method for low permeability reservoir.
基于考虑启动压力梯度和介质变形特性的单相流渗流方程，建立了适应于低渗透油藏油井的产能方程，并给出了低渗透油藏单相流ipr预测方法。
Based on the flow equation concerned on threshold pressure gradient and deforming media, this paper productivity equation and IPR forecasting method for low permeability reservoir.
基于考虑启动压力梯度和介质变形特性的单相流渗流方程，建立了适应于低渗透油藏油井的产能方程，并给出了低渗透油藏单相流ipr预测方法。
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