First, gradient image is constructed by using direction templates convolve with image.
首先利用方向模板对图像进行卷积，求得梯度图像。
A method for computing the width of blur is presented based on the gradient image of blurring image.
提出了一种基于模糊图像的梯度图像计算模糊宽度的方法。
Due to noise and irregularity of the gradient image, watershed algorithm used to segment images generally leads to over-segmentation, which is unacceptable.
分水岭算法用于图像分割时通常由于噪声的存在和梯度的不规则造成过度分割。
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 system of automatic boundary data acquisition can obtain the curve data of the endocardium boundary of left ventricle with the tracing algorithm of the gradient image edge.
自动边界数据采集系统是用梯度边缘追踪法自动获取左室内膜边界的曲线点，使用三次曲线插值法及最小二乘法拟合整条左室边界曲线。
In the gradient image, only the summits of main peaks corresponding to real edges are extracted, where as the little sharp maxima in edges' vicinity caused by noises would not be chosen.
并且它仅选取出梯度图中相应于边缘的极大值点，在其附近由噪声引起的小的极大值点不会被选取出。
In the gradient image, only the summits of main peaks corresponding to real edges are extracted, where as the little sharp maxima in edges' vicinity caused by noises would not be chosen.
并且它仅选取出梯度图中相应于边缘的极大值点，在其附近由噪声引起的小的极大值点不会被选取出。
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