#pragma warning(disable : 4244)

#if (_MSC_VER)      
// make microsoft visual studio complain less about double / float conversion.
#pragma warning(disable : 4244)
#endif

ofQuaternion.h 에서 참고

Take Screenshot After Some Delay: gnome-screenshot

$ gnome-screenshot -w -d 2

 -d 2 is used for delaying the screenshot for 2 seconds. So within the 2 seconds, we can make the window which we want to take screenshot as active.

Lifelines

Lifelines of referenced historical figures

꼭지점 필터

솔리드 웍스 작업중에 자꾸 켜지는 꼭지점 필터.

Curvature

Geometry perception 과 관련하여:

Larger curves explored by touching multiple points, whether statically or dynamically, appear to be judged by the difference in local slope at different points of contact (Pont, 1997; Pont, Kappers, & Koenderink, 1999).

from Lederman, Susan J., and Roberta L. Klatzky. "Haptic perception: A tutorial." Attention, Perception, & Psychophysics 71.7 (2009): 1439-1459.

Pont, S. C. (1997). Haptic curvature comparison. Unpublished doctoral

dissertation, Helmholz Instituut, Utrecht.

Pont, S. C., Kappers, A. M. L., & Koenderink, J. J. (1999). Similar mechanisms underlie curvature comparison by static and dynamic touch. Perception & Psychophysics, 61, 874-894.

수요일 알리미

"매번 벌써 수요일인가?" 라는 생각을 하게하는 수요일 알리미. 

myDAQ

좋은 세상이구나~

Eigenvalues of rotation matrix : 0~180 degrees

Eigenvalue의 의미를 보여주는 그래프. y축은 imaginary axis.

추가 1)

When an n×n rotation matrix, Q, does not include −1 as an eigenvalue, so that none of the planar rotations of which it is composed are 180° rotations, then Q+I is an invertible matrix. Most rotation matrices fit this description.

http://en.wikipedia.org/wiki/Rotation_matrix

천불동 계곡

사진기로는 담기 힘들었던 천불동 계곡. 

우리나라를 다시보게 만든다.

잘 보면 사람 얼굴같은 바위

Leap motion

Leap Motion 설치 완료. 두둥

sensor_msgs/JointState - ROS

Raw message definition:

string[] name
float64[] position
float64[] velocity
float64[] effort

# This is a message that holds data to describe the state of a set of torque controlled joints. 
#
# The state of each joint (revolute or prismatic) is defined by:
#  * the position of the joint (rad or m),
#  * the velocity of the joint (rad/s or m/s) and 
#  * the effort that is applied in the joint (Nm or N).
#
# Each joint is uniquely identified by its name
# The header specifies the time at which the joint states were recorded. All the joint states
# in one message have to be recorded at the same time.
#
# This message consists of a multiple arrays, one for each part of the joint state. 
# The goal is to make each of the fields optional. When e.g. your joints have no
# effort associated with them, you can leave the effort array empty. 
#
# All arrays in this message should have the same size, or be empty.
# This is the only way to uniquely associate the joint name with the correct
# states.

from http://www.ros.org/doc/api/sensor_msgs/html/msg/JointState.html

금산

하늘과 너무 잘 어울리는 간판

몇몇 집은 열었지만

 

찾아간 날은 정기휴일 !

 

삼계탕집에서 인삼주가 신기한 도로시

jebns

처음에 jebns가 뭔가 했다.

.....sugar

getGaussianKernel

getGaussianKernel : Returns Gaussian filter coefficients.
getGaussianKernel(int ksize, double sigma, int ktype=CV_64F )

ksize – Aperture size. It should be odd ( \texttt{ksize} \mod 2 = 1 ) and positive.

sigma – Gaussian standard deviation. If it is non-positive, it is computed from ksize as sigma = 0.3*((ksize-1)*0.5 - 1) + 0.8 .

ktype – Type of filter coefficients. It can be CV_32f or CV_64F .

int M = 101;

double sigma = 10;

Mat_ g = getGaussianKernel(M, sigma, CV_64F);

for(int i=0; i

{

double g1 = g(i,0);

Dbg("%f", g1);

}

Mat_ 접근

// more convenient forms of row and element access operators 

    _Tp* operator [](int y);

    const _Tp* operator [](int y) const;

    _Tp& operator ()(int row, int col);

    const _Tp& operator ()(int row, int col) const;

    _Tp& operator ()(Point pt);

    const _Tp& operator ()(Point pt) const;

아래는 http://bytefish.de/blog/opencv/code_snippets/ 에서 가져옴

template

void printMat(const cv::Mat_<_tp>& mat) {

    typedef typename DataType<_tp>::work_type _wTp;

    for(int i = 0; i < mat.rows; i++)

        for(int j=0; j < mat.cols; j++)

            cout << (_wTp) mat(i,j) << " ";

    cout << endl;

}