-
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
-
yimo
最小二乘自动向量机LSSVM的MATLAB程序实现,用于建立PM2.5污染物与其他污染物(如SO2)关系的数学模型。(Least Squares SVM automatic LSSVM MATLAB program to achieve, for the establishment of PM2.5 pollutants and other contaminants (such as SO2) mathematical model of relations.)
- 2015-01-06 16:06:10下载
- 积分:1
-
绘制转子振动轴心轨迹的实验程序 myorbit
本程序是绘制转子振动轴心轨迹的实验程序。
主要功能是进行绘制转子的轴心轨迹。(This procedure is the experimental procedure for drawing the axis of the rotor vibration axis.
The main function is to draw the axis of the rotor track.)
- 2017-04-27 15:07:44下载
- 积分:1
-
watermark
LSB图像水印的MATLAB实现,欢迎大家下载
(LSB watermark)
- 2010-06-14 14:54:25下载
- 积分:1
-
demodulation
说明: bpsk、qpsk、16qam、64qam的解调matlab算法(bpsk、qpsk、16qam、64qam demodulation)
- 2010-04-20 22:16:12下载
- 积分:1
-
xitong1
永磁同步电机基于svpwm的矢量控制模型,非常实用。不同于spwm(Permanent magnet synchronous motor vector control model based on svpwm, very practical. Unlike spwm)
- 2013-04-17 17:49:17下载
- 积分:1
-
matlab_time_frequence
说明: 有关时频分析的matlab的程序 希望对大家有所帮助(the time-frequency analysis of the procedures Matlab we hope to help)
- 2006-03-25 11:29:33下载
- 积分:1
-
MATLAB6.5
MATLAB6.5辅助图像处理这本书的pdf文件。非代码。但对学习图像处理有帮助(MATLAB6.5 assisted image processing pdf file of this book. Non-code. But there is help for learning image processing)
- 2010-05-31 23:29:48下载
- 积分:1
-
DCT
matlab,数字水印,信息隐写,适合毕业设计(Matlab, the digital watermark)
- 2012-05-27 18:16:10下载
- 积分:1
-
disparity-map
双目视觉,求双目视觉图像视差图,直接运行demo即可(Binocular vision, seeking binocular disparity map visual images, demo can be run directly)
- 2021-03-31 19:29:08下载
- 积分:1