边缘算子

We will go into particulars some color spaces in common use and their characteristics,and summarize color image edge detection approaches arising in recent years.

在灰度图像中，图像的边缘是由灰度不连续造成的。检测灰度图像边缘最简便的方法就是利用各种微分算子[1]。相

Then,the direction of image edge is realized by wavelet transform and looking for local maximum values of gradient amplitude.

通过与经典影像边缘提取算子的实验对比，表明该方法更适合于斑点噪声明显的SAR影像边缘检测。

In Chapter two, Based on analysis some important methods of edge detection, a new detection approach via IIR exponential smoothing filter and nonlinear Laplacian operator is presented, which is suited to stereo vision. In order to implement the method and improve its practical value in application, a fast algorithm with structure recurred filter is developed.

第二章在总结分析了现有边缘检测技术的基础上，以立体视觉为应用背景，有目的的提出了一种基于IIR指数平滑滤波与非线性Laplacian算子的边缘检测方法，为了提高实用性，导出了一组递归滤波器方式的快速实现算法。

Canny operator video segmentation is a method that gets the edge of image and segments it by using image edge detection.

Canny算子视频分割中运用了图像的边缘检测方法，把图像的边缘提取出来对图像进行分割。

A fast extraction method of beer bottle rasied character is introduced in this paper. It is the technique combination of moving target tracking based on dynamic image sequence with edge detection algorithm for speeding up the processing of character extraction to meet the demand of on-line detection in industry. First dynamic image sequence is obtained with an area CCD camera, and the background frames are detected based on the coherence between the background and character image from the video and inevitability of background frames emergence.

运用基于动态图像序列的运动目标跟踪技术，结合图像边缘提取理论中的检测算子模板，提出了一种快速提取啤酒瓶凸性字符的方法：首先采用单个面阵CCD得到啤酒瓶字符的运动图像序列，然后利用背景在运动图像序列中的镜头突变性和出现的必然性，检测视频流中的背景帧，最后采用基于边缘检测的背景配准方法，得到运动图像和校正背景图像的差分图像，恢复出真正的运动物体。

Finally, combining PDE with Differential Geometry, parametrically representing the surface, tensor based image processing techniques have been proposed, such as edge detection , morphological operation? implicitly representing the surface as the level-set of the higher dimensional function, the variational problems and partial differential equations that define maps onto the given generic surface have been discussed.

本文结合微分几何学，基于曲线坐标系下的微分算子将平面上的图像处理框架推广到曲面上，得到了参数化曲面上的图像处理框架，并给出了边缘检测和形态学运算的算例；在已知给定曲面的隐式表达时，探讨了定义在任意曲面上的偏微分方程，解决了任意曲面上数据场的扩散问题。

First, we carry on the pretreatment to the original license plate image; then,detect the car licence edge with one anti-chirp mathematics morphology edge detection operator; finally, remove the horizontal noise of car licence mage and union horizontal, vertical positioning projection for locating the car licence.

首先，对原始车牌图像进行预处理；然后，利用一种抗噪型数学形态学边缘检测算子进行车牌边缘检测；最后，去除图像水平噪声，结合水平、垂直投影进行定位。

First, the color-image was preprocessed with grayscaling, smoothing. The vertical gradient components of the image were found using the vertical mask of Sobel operator. Then the candidate areas with sufficient amount of edges were determined by calculating the gradient of edges. After finding possible vehicle candidates, the proposed method measured the prominent vertical symmetry of candidate areas and verified all possible candidates, as symmetry is an important feature of vehicle. The proposed method also figured out the vertical axis of symmetry and the width of the candidate vehicle.

算法首先对图像进行灰度化、平滑去噪等预处理，使用Sobel算子垂直方向掩模计算图像感兴趣区域内的边缘梯度，确定候选区域；而后根据车辆图像垂直边缘具有对称性的特点，分析候选区域的对称性强弱，并计算其对称轴位置和车辆宽度。

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。

The proposed method applies color- pair zone detection, color-pair edge detection, chrominance maximum statistic and intensive small edge enhancement to input images, and the results are integrated by fuzzy set operators so that the license plates could be extracted accurately.

该方法用图像颜色对区域检测、颜色对边缘检测、色度峰值统计及密集小边缘增强，使用模糊集算子综合它们的结果，精确提取出车牌。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。