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全部文章（共226篇）

[bash]基础shell命令总结

1. echo 相当于 C语言的 printf。打印字符串到console。 $ echo $COLUMNS x $LINES40 x 27 上面这个命令打印了当前terminal的窗口大小。 2. ls 显示当前文件夹下的所有文件及文件夹。 $ lsvagrants 当前文件夹...

2020-07-13

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无bug版本的生物信息学c++工具包 BALL 1.1.1

BALL BALL project 1.1.1 bugs-free version 下载链接: 点击我修改了下源码可以直接编译成功了。现在的版本就是可正常编译的版本。当然，版权归BALL-Project 团队所有。 Welcome to BALL-1.1.1 Thi...

2020-07-13

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使用cuda计算灰度图像

下面是一个利用cuda计算数组元素三次方的c程序。 #include <stdio.h> // __global__ 是cuda核函数标识符。cuda会将这个函数识别为核函数 __global__ void cube(float * d_out, float * d_in){ /...

2020-07-13

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[cuda] 02 Communication Pattern and GPU hardware

parallel computing parallel computing : many threads solving a problem by working together. The key to work together is to communicate. 00. MAP Ta...

2020-07-13

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根据 Rodrigues 旋转公式、旋转矩阵以及主轴方向反求旋转角

旋转矩阵与乘法操作组成了一个群。利用群论知识，推出 Rodrigues 旋转公式。其中 w 是单位方向向量，表示旋转主轴方向, R为物体绕此轴旋转theta 角后得到的旋转矩阵。那么,则有直接可以反解出，theta 例如，解得，正弦值为0.6，余弦值为0.8.,

2020-07-13

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[cv] linearity and convolution

Linearity: An operator or system H is linear if two properties hold: 1. Additivity: H(f1+f2) = H(f1) + H(f2) 2. scaling multiplicative H...

2020-07-13

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[cv] filters as templates-normxcorr2(template,img)

introduction images are not just functions (intensity). it also contains location properties. 1D correlation the filter is normalized and then i...

2020-07-13

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[cv]edge detection: gradients

usually, filter is used to find a specific pattern in the pictures. If we want to find lines and edges in the picture, firstly we think about gradien...

2020-07-13

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[cv]edge detection: 2d operators

derivative of 2d gaussian filter Gaussian derivative in x,y direction effect of sigma in smoothing filter canny edge operator in mat...

2020-07-13

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[cv]Fourier-transform

Basis Sets 生成向量空间V的最小基向量集合。 image can be regarded as an 1D vector. sin signal Asin(wx+ψ) 三个自由度， A，w， ψ . time a...

2020-07-13

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