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stabbing
- 给定n维空间中的m个非空点集S1,…,Sm,如果直线L与每个点集均有公共点,则称L为这m个点集的一条直线穿越(line transversal 或 stabbing line)。同样,如果线段K(本文中的线段均指闭线段,且包括单点集)与每个点集均有公共点,则称K为这m个点集的一条线段穿越(segment transversal 或 stabbing line segment)。穿越的概念是海莱定理(Helly’s theorem)的延伸,它的存在性等问题一直是计算几何中海莱类定理(Helly-t
Imagesegementation
- To carry on small comparison for he different threshold value under the image segmentation result, have to use many windows,namely for take a look at a different threshold value of slice segmentation ’s result at same window , the window be divided i
otsu
- Compute a segmented image (Iseg) containing n classes by means of Otsu s n-thresholding method (Otsu N, A Threshold Selection Method from Gray-Level Histograms, IEEE Trans. Syst. Man Cybern. 9:62-66 1979).
yanyan
- 把一个256*256的图像分成8*8小块,然后进行DFT变换,分别比较在空间域和频域内对图像进行二次抽样和差值最后得出的图像比较-1. Get a grey level image which size is N*N. (For example, 256*256, however, N = ), and partition to 8*8 sub images. 2. Apply DFT to these sub images, and get the fourier transfo
Ztransformation
- 画出满足差分方程:y[n]-1.25y[n-1]+0.75y[n-2]-0.125y[n-3]=x[n]+0.5x[n-1],离散时间信号X[n]的双边z变换是离散傅里叶变换的推广,而离散时间傅里叶变换在研究离散时间信号与系统中是很有用的。 -Drawn to meet the difference equation: y [n]-1.25y [n-1]+ 0.75y [n-2]-0.125y [n-3] = x [n]+ 0.5x [n-1], discrete-time signal X
090211
- 细化参数的对数极坐标变换图像纹理特征提取算法提出一种细化参数的对数极坐标变换图像纹理特征提取算法,可以有效地消除旋转、缩放和平移等几何形 变的影响.在特征提取过程中,通过自相关图像消除平移的影响,引入细化参数的对数极坐标变换消除旋转和伸缩 的影响.在图像检索过程中,将不完全树型小波变换所得的特征矢量,通过欧式距离来度量图像之间的相似度.实 验表明,本算法对发生几何形变的纹理图像检索平均正确率达81.05 左右,较之传统算法能取得更好的检索 效果.-This paper p rop
1
- 将一幅256*256的图像分成8*8的小块,对其进行DFT变换。分别比较在空间域和频域内对源图像进行二次抽样和差值最后比较不同-1. Get a grey level image which size is N*N. (For example, 256*256, however, N = ), and partition to 8*8 sub images. 2. Apply DFT to these sub images, and get the fourier transfor
1122zhenyan
- 这个是C制作的源代码。。。 对一幅图像进行DFT变换,分别对源图像在空间域和频域里进行二次抽样和差值,最后得出结果比较。- Get a grey level image which size is N*N. (For example, 256*256, however, N = ), and partition to 8*8 sub images. Apply DFT to these sub images, and get the fourier transformed ima
kmp
- KMP是一种快速字符串匹配算法,KMP算法的时间复杂度为O(m+n)。-KMP string matching algorithm is a fast, KMP algorithm' s time complexity is O (m+ n).
Digitalsubtraction
- 数字减影血管造影( DSA) 通过向血管中注入造影剂, 使血管的整体影像的对比度有了明显的增强, 然后通 过造影前后图像的相减运算, 可以去除非血管器官的影像, 得到血管更清晰的图像, 目前广泛应用于心血管疾病的 诊断。由于患者的呼吸运动, 使得不同时间采集的图像相减后会产生运动伪影。为了消除运动伪影, 从医生临床上 对于心脏的运动以胸腔的横膈膜为参考目标得到启发, 首先得到很多幅注入造影剂之前的图像( 掩膜图像) 和一幅 注入造影剂之后的图像( 造影图像) , 然后指定其中的一
SiftGPU-V370
- 使用gpu、cpu并行进行sift算子计算匹配,能够在原来的基础上加速处理,但对显卡要求较高,具体环境配置使用方法可以参照mannual-SiftGPU is an implementation of SIFT [1] for GPU. SiftGPU processes pixels parallely to build Gaussian pyramids and detect DoG Keypoints. Based on GPU list generation[3], SiftGPU th
regionpushrelabel-v1.01
- graphcut应用 Global optimisation via s-t graph cuts is widely used in computer vision and graphics. To obtain high-resolution output, graph cut methods must construct massive N-D grid-graphs containing billions of vertices. We show that when th
imnoise3
- 产生一个周期噪声, 用法:[r,R,S]=imnoise3[M,N,C,A,B]-generate periodic noise
11f1bbfc0c65
- 对二值图像边界进行跟踪,对边缘进行判断,然后沿着边缘进行跟进- C = CONTOUR_FOLLOWING(BW) takes BW as an input. BW is a binary array containing the image of an object ( 1 : foreground, 0 : background). It returns a circular list (N x 2, C(1,:)=C(end,:)) of the (row,co
a
- ·· opencv ··· 基础程序中的模块匹配 -[code]#include <cv.h> #include <cxcore.h> #include <highgui.h> #include <stdio.h> int main( int argc, char** argv ) { IplImage*src,*templ,*ftmp[6] //ftmp will hold results int
GraphDis
- 两个图算法 完整工程 1、实现O(n + r)时间复杂度内,good guy和bad guy的匹配 2、在无环图中,寻找两点之间的路径数目-(1)There are two types of professional wrestlers: "good guys" and "bad guys." Between any pair of professional wrestlers, there may or may not be a rivalry. Suppose we ha
Interacting-Multiple-Model
- 提出了一种基于粒子滤波的交互式多模型多机动目标跟踪算法 -an inter act ing mult iple model tar get t racking algor ithm of mult iple maneuvering target s based o n part icle filter is pr opo sed
img2tif_dist
- The img2tif program converts an Imagine .img file into one or more GeoTIFF files. Usage: img2tif [-i img_filename] [-o tif_basename] [-c] [-v n...] [-rgb [red_band green_band blue_band]] [-?] [-quiet] Arguments: -i input .img file
Catmull-Clark-
- 设P(m,n)是初始控制点列,即原曲面的点(m行n列)。Q(m,n)是一次细分后得到的曲面的控制节点。 此函数采用Catmull-Clark细分曲面算法,对双三次B样条曲面细分,即m=n=4。 利用我们在13章第四节学过的知识,有公式MQM =SMPM S ,其中M,S可由课件知 构造初始控制点列(p1,p2),其中p1是P的行坐标,p2是P的列坐标 -Let P (m, n) is the initial control point of the column, i.e. th
omp
- 简单的正交匹配追踪算法,应该都能看懂的。s-测量;T-观测矩阵;N-向量大小-The simple orthogonal matching pursuit algorithm should be able to understand the. s-measurement T-observation matrix N-vector size