关于图像处理中特征点描述算子的一点总结.docx
- 文档编号:5912755
- 上传时间:2023-01-02
- 格式:DOCX
- 页数:15
- 大小:18.21KB
关于图像处理中特征点描述算子的一点总结.docx
《关于图像处理中特征点描述算子的一点总结.docx》由会员分享,可在线阅读,更多相关《关于图像处理中特征点描述算子的一点总结.docx(15页珍藏版)》请在冰豆网上搜索。
关于图像处理中特征点描述算子的一点总结
关于图像处理中特征点描述算子的一点总结
1.SIFt算子SIFT算子是David
GLowe在2004提出的,即尺度不变特征变换(Scale
InvariantFeatureTransform)。
它是以尺度空间的构造为基础的局部特征描述算子,对于图像的缩放、旋转和放射变换等具有不变性。
SIFT算子在构建好的尺度空间的基础上搜索尺度空间中的极值点(特征点),然后确定极值点的尺度信息以及位置,再确定极值点的方向(其邻域梯度的主方向),最终可以得到具有鲁棒性的128维(4*4*8)的特征描述子。
2.surf特征
SURF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">(Speed-Up RobustFeatures 12.0pt;line-height: 125%; font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">)算子 12.0pt; line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">选取图像在尺度空间上的极值点作为候选特征点。 与SIFT 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">算子不同的是SURF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">算子采用Hessian 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">矩阵行列式近似值来构造金字塔。 提取SURF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">特征点需要4 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">个步骤: 提取SURF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">特征,对于特征点进行定位,赋予主方向,生成特征点描述符。 3.BRIEF特征 BRIEF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">特征(binaryrobustindependent elementaryfeatures) 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">是Calonder 12.0pt; line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">等 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">在2010 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">年提出来的,他采用二进制字符串作为特征点描述符,因而在速度和性能上都有着卓越的表现。 其主要思路是: 在特征点附近随机的选取若干点对,将这些点对的灰度值大小组合成一个长为256 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">的二进制字串,并将这个二进制字串作为该特征点的特征描述子。 由于其描述子利用二进制(“0” 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">和“1” 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">)编码,因此在特征匹配时只需计算2 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">个特征点描述子的Hamming 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">距离。 大量实验表明,不匹配特征点的描述子的Hamming 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">距离在128 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">左右,匹配点对描述子的Hamming 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">距离则远小于128 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">。 由于BRIEF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">的匹配速度远高于SURF 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">和SIFT 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">,因此应用较为广泛。 BRIEF 12.0pt;line-height: 125%; font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">特征描述符是一个bit 12.0pt; line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">串,有若干个二值 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">测试组成,即影像块 ( 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">尺寸为 ) 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">经过平滑后再进行若干 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">测试。 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">其中,影像块 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">在x 12.0pt; line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman"; mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman"; mso-font-kerning: 0pt;mso-ansi-language: FR">处的灰度值定义为 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">,特征描述符为一个长度为 12.0pt;line-height: 125%;font-family: 宋体;mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman";mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt; mso-ansi-language: FR">的二进制串: 12.0pt;line-height: 125%;font-family: 宋体; mso-ascii-font-family: "TimesNewRoman";mso-hansi-font-family: "TimesNewRoman"; mso-bidi-font-family: "TimesNewRoman";mso-font-kerning: 0pt;mso-ansi-language: FR">这里有两点要注意: 1
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 关于 图像 处理 特征 描述 算子 一点 总结