边缘检测

Feature of principal lines spatial distribution: detect the principal lines through edge detecting technology, and then divide the image of palmprint into blocks with same dimension, compute the mean and variance as feature; Feature of palmprint direction: divide the image into sub-images; compute the max angle of projection and coordinate of each sub-image, which stand for the direction and location of the line on the palm; Feature of moment invariants: compute the moment invariants of each sub-image and the whole image as feature.

掌纹主线空间分布特征：利用边缘检测技术检测出掌纹的主线，将图像分割成相同大小互不重叠的子图，提取每一个子图的均值和方差作为特征；掌纹线方向特征：将图像分成不重叠的子图，利用Radon变换求出每一个子图的最大投影角度和坐标，也就是子图内掌纹线的方向和位置，构造特征向量；掌纹不变矩特征：提取图像整体和分割后的子图的不变矩作为特征。

Several edge detection operator of comparison, the paper for the boundary detection algorithm to do useful research.

详细说明：几种边缘检测算子的比较，该论文对于做边界检测的算法研究很有帮助。

Finally, it studies the application of the edge detection in human face detection and recognition.

最后通过实例研究了人脸边缘检测在人脸检测和识别中的具体应用。

Finally, it introduced the application of the edge detection in human face detection and recognition.

最后介绍了人脸边缘检测在人脸检测和识别中的具体应用。

In this dissertation the 3-order based spline multi-scale wavelet edge detection algorithm are applied to detect edges which out and away improve the measurement accuracy of the stripe size.

本文应用3阶B样条小波多尺度边缘检测算法去定位条纹边缘，大大提高了尺寸测量的精度。

The algorithm in this paper is based on territory value segmentation of the junction region. The algorithm makes use of edge detection to distill the region of the edge, and conducts domain segmentation, then comminutes the pixels of regional at the junction each region strictly, transfer the similar color to the same region.

本文提出了基于区域交界处的域值分割颜色迁移算法，利用边缘检测方法提取景物边缘交界处区域，进行域值分割，将区域交界处的像素严格分割到所属的区域中，使得属于同一区域的像素迁移同类颜色，最后将已迁移颜色的目标图像均值方差归一化。

In the paper, research begins with these two areas.the algorithm in this paper is based on territory value segmentation of the junction region. the algorithm makes use of edge detection to distill the region of the edge, and conducts domain segmentation, then comminutes the pixels of regional at the junction each region strictly, transfer the similar color to the same region.

本文提出了基于区域交界处的域值分割颜色迁移算法，利用边缘检测方法提取景物边缘交界处区域，进行域值分割，将区域交界处的像素严格分割到所属的区域中，使得属于同一区域的像素迁移同类颜色，最后将已迁移颜色的目标图像均值方差归一化。

Focusing on offering an accurate and convenient evaluating method in edge-location algorithms, it first presents the method to obtain gray value of elliptical shape edge based on square aperture sampling, then convolutes the image with a Gauss filter and adds noise to the pre-processed image with the same intensity calculated in real image.

针对评价边缘检测算法精度时没有合适的评定标准的问题，首先根据方形孔径采样定理，详细说明了椭圆形状边缘灰度的求取方法，然后以真实拍摄图片为标准，对图像进行了高斯模糊和噪声的添加，形成最终的模拟图像。

After convolving the image model with the edge detection operators of second derivative model, a plane fitting in the least squares sense is used to detect the zero crossing points as edge points.

使用二阶导数型边缘检测算子对图象模型进行卷积后，用均方误差最小的准则对卷积后的图象进行平面拟合，并求出零交点作为图象的边缘点。

According to the edge detection theory based on modulus maxima of wavelet transform, an infinitely differentiable wavelet with good antisymmetry was deduced to extract the edges of defects from X ray spot weld inspection images.

基于小波模极大值边缘检测原理，推导出一类具有良好反对称性的无限光滑小波并运用于点焊缺陷的边缘提取。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。