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ip04
现代通信系统(matlab版本)第二版,第一章的第四个例题程序.(Modern communication systems (matlab version) second edition, the first chapter of the fourth Example program.)
- 2009-11-09 11:59:08下载
- 积分:1
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buduichen
计算米散射参数,包括消光系数,散射系数,不对称因子(Calculation of rice scattering parameters)
- 2017-12-19 20:56:54下载
- 积分:1
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rfgg
低通滤波器是容许低于截至频率的信号通过, 但高于截止频率的信号不能通过的电子滤波装置。
(low-pass filter )
- 2011-01-08 23:22:17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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C56766
Forensic science it the study of objects that relate to a crime. Forensic scientists study evidence so that it can be used in a court of law. Forensic scientists observe, classify, compare, use numbers, measure, predict, interpret data, and draw inferences based on evidence. In this lesson, students will use these science inquiry skills.In this dental image was classify by sift algorithm
- 2014-01-22 15:16:09下载
- 积分:1
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lab1
用fft对数字信号进行频谱分析,包括对信号的采样,频谱分析,相位分析(The frequency spectrum analysis based on fft)
- 2021-04-19 15:58:51下载
- 积分:1
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a-dft-watermark
基于傅里叶变换的数字水印算法,在原始图像的傅里叶变换域中对称的嵌入数字水印信息(Fourier transform-based digital watermarking algorithm, the original image of the Fourier transform domain, the embedded digital watermark information symmetry)
- 2011-05-11 09:07:20下载
- 积分:1
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1
说明: PUDN IS BEST SITE FOR CODES
- 2011-06-23 20:49:50下载
- 积分:1
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G-B-Clayton--Steve-Winder-Operational-amplifiers-
G B clayton operational amplifiers textbook
- 2014-11-14 15:15:09下载
- 积分:1
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Subplot_2
sub plot method in matlab
- 2012-04-24 16:37:22下载
- 积分:1