边缘检测

The validity of above methods were proved by experiment Secondly, applied HHT to edge detection of fundus image and proposed a method of edge detection based on Bidimensional Empirieal Mode Decomposition.

其次，本文将HHT方法应用于眼底图像边缘检测，提出了基于二维经验模式分解（Bidimensional Empirical Mode Decomposition，简称为BEMD）的图像边缘检测算法。

Canny edge detection that the image edge detection method is the best way.

证明了Canny边缘检测方法是图像边缘检测的最佳方法。

According to the requests of packaged granary grain quantity intelligent reckoning, took the actual scene video as the analysis object, and used the dual threshold canny operator and the morphology processing method to extract the grain bag characteristic outline-counter-band of light boundary.

摘 要：针对袋装粮数量智能测算的要求，以实际场景视频图为分析对象，在对典型边缘检测算法实验结果分析的基础上，采用双阈值canny边缘检测算子和形态学处理的方法提取粮袋特征轮廓——反光带的边界。

It includes hardware equipments and foundational theory of the image digitization. This paper expatiates on some digital image processing technologies that the inspecting system may apply to the research and analysis of the collected glass-crack image. Using neighborhood average method and median filter retrains the image noises and make the image edge smooth. Then protract the histogram of the gray image, get the threshold of this image, utilize the threshold method and gray-level slice method to get a binary image, and detect the image edge. Finally calculate the area and perimeter of the glass-crack image, and use the circularity to judge whether this image is a glass-crack image.

本文重点阐述了研究和开发这套玻璃瓶裂纹检测系统所应用到的一些数字图像处理技术，并应用这些技术和方法对采集的裂纹图像进行了处理和分析：应用邻域平均法和中值滤波法来抑制图像的噪声，使图像的边缘平滑；然后绘制出处理过图像的灰度直方图，得到该幅裂纹图像的阈值，利用阈值法和灰度级切片法对裂纹图像进行二值化处理，得到其二值图像，并对图像进行了边缘检测；最后计算出裂纹图像的面积和周长，利用圆形度指标来判断该图像是否为裂纹图像。

Experimental result makes clear, detect with traditional brim methodological photograph is compared, this method has very strong inhibition noise ability and nice edge detect function.

实验结果表明，和传统的边缘检测方法相比，该方法具有很强的抑制噪声能力和良好的边缘检测性能。

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。

The normal methods with different algorithm are very sensitive to noise in edge detection.

传统的图像边缘检测方法由于引入了各种微分运算，因此用于噪声图像边缘检测时对噪声极度敏感。

Edge detection is one of the important roles in the digital image processing, the Prewitt operator, LOG operator and Canny operator are adopted in the classical edge detection operator arithmetic in space domain.

边缘检测是数字图像处理的一个重要内容，讨论了经典的边缘检测算子算法，该算法更多地采用Prewitt算子、LOG算子、Canny算子等在空域中进行。

Because the proposed model has the property of multi-scale, the excellent anti-noise in the interior of the region, and the noise weakening faintish edge, the corresponding algorithm has good performance in image edge detection.

该模型具有多尺度、区域内部抗噪能力与尺度有关、噪声弱化弱边缘以及边缘具有隶属度、图像的边缘检测结果与尺度有关等特点，反映了边缘与纹理依尺度的关系。

This article has analyzed the advantages and disad- vantages of Canny algorithm.

但是，由于边缘检测问题固有的复杂性，边缘和噪声都是高频信号，很难在噪声和边缘中作取舍，使这些方法在抗噪声性能和边缘定位等方面往往不尽如人意。

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。