opencv scalar函数_opencv scalar的用法_scalar 1 opencv

OpenCV基础篇之绘图及RNG随机数对象

程序及分析

/*

* FileName : random_gen.c

* Author : xiahouzuoxin @163.com

* Version : v1.0

* Date : Tue 29 Jul 2014 08:31:41 PM CST

* Brief :

*

*/

#include <cv.h>

#include <highgui.h>

#include <iostream>

using namespace std;

using namespace cv;

const char wndname[] = "Drawing";

const int RAND_N = 100;

void help(void)

{

cout<<"Usage:./drawing"<<endl;

}

static Scalar random_color(RNG& rng)

{

int icolor = (unsigned)rng;

return Scalar(icolor&0xFF, (icolor>>8)&0xFF, (icolor>>16)&0xFF);

}

int main(int argc, char *argv[])

{

int line_type = CV_AA;

int i = 0;

int width = 1000;

int height = 700;

int x1 = -width/2;

int x2 = width*3/2;

int y1 = -height/2;

int y2 = height*3/2;

const int DELAY = 10;

RNG rng(0xFFFFFFFF);

Mat image = Mat::zeros(height, width, CV_8UC3);

imshow(wndname, image);

waitKey(DELAY);

for (i=0; i<RAND_N; i++) {

Point pt1;

Point pt2;

pt1.x = rng.uniform(x1, x2);

pt1.y = rng.uniform(y1, y2);

pt2.x = rng.uniform(x1, x2);

pt2.y = rng.uniform(y1, y2);

line(image, pt1, pt2, random_color(rng), rng.uniform(1,5), line_type);

}

imshow(wndname, image);

waitKey(0);

for (i=0; i<RAND_N; i++) {

Point org;

org.x = rng.uniform(x1, x2);

org.y = rng.uniform(y1, y2);

putText(image, "OpenCV",org, rng.uniform(0,8),rng.uniform(0,10)*0.5+0.1,

random_color(rng), rng.uniform(1, 10), line_type);

}

imshow(wndname, image);

waitKey(0);

return 0;

}

1.

RNG是OpenCV中的随机数生成类，其定义在core.hpp中，

class CV_EXPORTS RNG

{

public:

enum { UNIFORM=0, NORMAL=1 };

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