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arclengthwew
The arclength of a general curve in 2 or more dimensions, using discrete points along the curve
- 2010-11-11 22:08:13下载
- 积分:1
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Gonzalezproblemanswer
说明: GONZALEZ数字图像处理第二版习题解答(英文版)(GONZALEZ Digital Image Processing Second Edition Problem Solutions (English))
- 2010-04-09 10:32:57下载
- 积分:1
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sift
1 SIFT 发展历程
SIFT算法由D.G.Lowe 1999年提出,2004年完善总结。后来Y.Ke将其描述子部分用PCA代替直方图的方式,对其进行改进。
2 SIFT 主要思想
SIFT算法是一种提取局部特征的算法,在尺度空间寻找极值点,提取位置,尺度,旋转不变量。
3 SIFT算法的主要特点:
a) SIFT特征是图像的局部特征,其对旋转、尺度缩放、亮度变化保持不变性,对视角变化、仿射变换、噪声也保持一定程度的稳定性。
b) 独特性(Distinctiveness)好,信息量丰富,适用于在海量特征数据库中进行快速、准确的匹配[23]。
c) 多量性,即使少数的几个物体也可以产生大量SIFT特征向量。
d) 高速性,经优化的SIFT匹配算法甚至可以达到实时的要求。
e) 可扩展性,可以很方便的与其他形式的特征向量进行联合。
4 SIFT算法步骤:
1) 检测尺度空间极值点
2) 精确定位极值点
3) 为每个关键点指定方向参数
4) 关键点描述子的生成
本包内容为sift算法matlab源码(1 SIFT course of development
SIFT algorithm by DGLowe in 1999, the perfect summary of 2004. Later Y.Ke its description of the sub-part of the histogram with PCA instead of its improvement.
2 the SIFT main idea
The SIFT algorithm is an algorithm to extract local features in scale space to find the extreme point of the extraction location, scale, rotation invariant.
3 the main features of the SIFT algorithm:
a) SIFT feature is the local characteristics of the image, zoom, rotate, scale, brightness change to maintain invariance, the perspective changes, affine transformation, the noise also maintain a certain degree of stability.
b) unique (Distinctiveness), informative, and mass characteristics database for fast, accurate matching [23].
c) large amounts, even if a handful of objects can also produce a large number of SIFT feature vectors.
d) high-speed and optimized SIFT matching algorithm can even achieve real-time requirements.
e) The scalability can be very convenient fe)
- 2012-05-25 15:31:16下载
- 积分:1
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cs-omp
关于压缩感知使用的凸优化工具包,非常实用,基于OMP的压缩感知。能够有效的压缩信息。(About compressed sensing using convex optimization toolkit, very practical, perception-based compression OMP. Can effectively compress the information.)
- 2015-01-01 21:29:14下载
- 积分:1
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arnold
利用matlab写的较基本的arnold加密与相应解密算法,其中的key可以任意改之,但加密次数不宜太多,最好在100次以内(Use matlab to write the basic Arnold encryption and decryption algorithm, one of the key can be arbitrary change, but the number of encryption shoulds not be too much, best within 100 times)
- 2013-05-07 02:27:58下载
- 积分:1
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ux
Ux profile in boundary layer
- 2013-12-12 15:07:28下载
- 积分:1
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EWT20150721
EWT算法,参考文献:IEEE, TSP, Empirical Wavelet Transform(EWT, ref: IEEE TSP, Empirical Wavelet Transform)
- 2015-11-25 16:43:59下载
- 积分:1
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A_enh_gray
基于curvelet的灰度图像增强,是在变换域里通过修改系数等达到(Curvelet-based gray-scale image enhancement, in the transform domain to achieve by modifying the coefficient)
- 2010-10-29 23:36:16下载
- 积分:1
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机械行业变转速零件
针对机械行业变转速零件如轴承,齿轮箱的故障诊断,采用阶次分析技术。程序针对变转速工况下的故障诊断。(Variable speed machinery industry parts such as bearings, gearboxes for fault diagnosis using order analysis techniques. Procedures for troubleshooting variable speed conditions.)
- 2020-07-08 14:08:57下载
- 积分:1
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MMSEReceiverforDS-SSinAWGNChannel
MMSE Receiver for DS-SS in AWGN Channel,这是一个完整的系统仿真程序(MMSE Receiver for DS-SS in AWGN Channel, this is a complete system simulation program)
- 2010-07-31 15:56:36下载
- 积分:1