C++随机马赛克图程序

效果：

或者灰度，cell大小可调

代码：

#include <opencv2\opencv.hpp>
#include <Windows.h>

struct parameters
{
	parameters()
	{
		size=cv::Size(640,480);
		fps=25;
		nF=50;
		save="";
		crossSize= cv::Size(15, 5);
		crossColor = 0;
		show=true;
		seed=cv::getTickCount();
		color=false;
		cellSize = cv::Size(5, 5);
	}

	cv::Size		size;
	int				fps;
	int				nF;
	std::string		save;
	cv::Size		crossSize;
	uchar			crossColor;
	bool			show;
	int64			seed;
	bool			color;
	cv::Size		cellSize;

	void setParas(
		cv::Size		_size,
		int				_fps,
		int				_nF,
		std::string		_save,
		cv::Size		_crossSize,
		uchar			_crossColor,
		bool			_show,
		int64			_seed,
		bool			_color,
		cv::Size		_cellSize)
	{
		size		= _size			   ;
		fps			= _fps			   ;
		nF			= _nF			   ;
		save		= _save			   ;
		crossSize	= _crossSize	   ;
		crossColor = _crossColor       ;
		show		= _show			   ;
		seed		= _seed			   ;
		color		= _color		   ;
		cellSize	= _cellSize			;

	}

	void showParas()
	{
		std::cout << "size: " << size << std::endl;
		std::cout << "fps: " << fps << std::endl;
		std::cout << "nF: " << nF << std::endl;
		std::cout << "save: " << save << std::endl;
		std::cout << "crossSize: " << crossSize << std::endl;
		std::cout << "crossColor: " << crossColor << std::endl;
		std::cout << "show: " << (show? "TRUE" : "FALSE") << std::endl;
		std::cout << "seed: " << seed << std::endl;
		std::cout << "color: " << color << std::endl;
		std::cout << "cellSize: " << cellSize << std::endl;

	}

};

void help()
{
	std::cout << "* -help : .\n"
		<< "    randomVideo.exe -help   |  to see how to use. \n"
		<< "    randomVideo.exe -size=(640,580)   |  to set video size. \n"
		<< "    randomVideo.exe -fps=25   |  to set video fps(default is 25). \n"
		<< "    randomVideo.exe -nF=50   |  to set number of frames. "
		<< "If fps is 25, 50 nF means the video will last 2 seconds (50/25). \n"

		<< "    randomVideo.exe -save=example1   |  "
		<< "to set video name, only *.avi support, "
		<< "you do not need input \".avi\". "
		<< "If empty, the default name is local-system-time.avi, your previous files are safe. \n"

		<< "    randomVideo.exe -crossSize=(15,5)   |  "
		<< "to set the size of cross."
		<< " (height, width) you can see the showing window. \n"

		<< "    randomVideo.exe -crossColor=0   |  Recommd not to set it. "
		<< "If = 0, black(default); if = 255, white.\n\n"

		<< "    randomVideo.exe -show=TRUE   |  Recommd to be TRUE. "
		<<"If FALSE, the window to show the video is stopped. \n"

		<< "    randomVideo.exe -seed=15   |  Recommd not to set it. "
		<<"If empty, the local time will be used, then,"
		<<" you will get different video each time. \n\n"

		<< "    { NEW } randomVideo.exe -color=TRUE   |  If FALSE, the video is gray. \n"

		<< "    { NEW } randomVideo.exe -cellSize=(2,3)   |  To control the size of pixel size. "
		<< "If cellSize=(2,3), the image width will be seperated into 2 parts, "
		<< "the image height will be seperated into 3 parts. In defalut mode pixel size as 1 will be used!"
		<< "In order to get exact pixel size, you need to calculate it by yourself. \n\n"

		<< "example:\n"
		<< "    randomVideo.exe -size=(640,580) -fps=25 -nF=50 -crossSize=(15,5) -color=1 -cellSize=(5,5)\n"
		<< "  The other parameters using default is fine. \n"

		<< std::endl;
}

void getParas(int argn, char** argv, parameters & _parameters)
{
	if (argn <= 1)
	{
		std::cout << "Using default parameter to generate video.\n"
			<< "How to use? Please check the usage by input \" randomVideo.exe -help\" \n"
			<< std::endl;
		help();
		exit(0);
	}
	else
	{
		std::map<std::string, std::string> table;
		for (int i = 1; i<argn; ++i)
		{
			std::string sub(argv[i]);
			std::string name = sub.substr(1, sub.find("=")-1);
			table.insert({name, sub.substr(sub.find("=")+1, sub.length()-sub.find("=")-1)});
		}

		if (table.count("help") == 1)
		{
			help();
			exit(0);
		}

		if (table.count("size") == 1)
		{
			cv::Size _size(atoi(table["size"].substr(1, table["size"].find(",")-1).c_str()),
				atoi(table["size"].substr(
					table["size"].find(",")+1, table["size"].length()-table["size"].find(",")-2
				).c_str()));
			_parameters.size = _size;
		}
		else
			_parameters.size = cv::Size(640, 480);

		if (table.count("crossSize") == 1)
		{
			cv::Size _crossSize(atoi(table["crossSize"].substr(1, table["crossSize"].find(",") - 1).c_str()),
				atoi(table["crossSize"].substr(
					table["crossSize"].find(",") + 1, table["crossSize"].length() - table["crossSize"].find(",") - 2
				).c_str()));
			_parameters.crossSize = _crossSize;
		}
		else
			_parameters.crossSize = cv::Size(15, 5);

		if (table.count("crossColor") == 1)
			_parameters.crossColor = atoi(table["crossColor"].c_str());
		else
			_parameters.crossColor = 0;

		if (table.count("fps") == 1)
			_parameters.fps = atoi(table["fps"].c_str());
		else
			_parameters.fps = 25;

		if (table.count("nF") == 1)
			_parameters.nF = atoi(table["nF"].c_str());
		else
			_parameters.nF = 50;

		if (table.count("save") == 1)
			_parameters.save = table["save"] + ".avi";
		else
		{
			SYSTEMTIME sys;
			GetLocalTime(&sys);

			char fname[100] = {};
			sprintf_s(fname, 100, "%4d-%02d-%02d_%02d_%02d_%02d.avi", \
				sys.wYear, sys.wMonth, sys.wDay, sys.wHour, sys.wMinute, sys.wSecond);

			_parameters.save = fname;

		}

		if (table.count("show") == 1)
			_parameters.show = (table["show"] == "TRUE");
		else
			_parameters.show = true;

		if (table.count("seed") == 1)
			_parameters.seed = atoi(table["seed"].c_str());
		else
		{
			SYSTEMTIME sys;
			GetLocalTime(&sys);
			_parameters.seed = sys.wYear + sys.wMonth + sys.wDay + sys.wHour + sys.wMinute + sys.wSecond;
		}

		/*if (table.count("color") == 1)
		{
			cv::Scalar _color(
				atoi(table["color"].substr(1, table["color"].find(",") - 1).c_str()),
				atoi(table["color"].substr(table["color"].find(",") + 1,
										   table["color"].find_last_of(",") - table["color"].find(",") - 2).c_str()),
				atoi(table["color"].substr(table["color"].find_last_of(",") + 1,
										   table["color"].find_last_of(")") - table["color"].find_last_of(",") - 1).c_str()));
			_parameters.color = _color;
		}
		else
			_parameters.size = cv::Size(640, 480);*/

		if (table.count("color") == 1)
			_parameters.color = (table["color"] == "TRUE");
		else
			_parameters.color = true;

		if (table.count("cellSize") == 1)
		{
			cv::Size _cellSize(atoi(table["cellSize"].substr(1, table["cellSize"].find(",") - 1).c_str()),
				atoi(table["cellSize"].substr(
					table["cellSize"].find(",") + 1, table["cellSize"].length() - table["cellSize"].find(",") - 2
				).c_str()));
			_parameters.cellSize = _cellSize;
		}
		else
			_parameters.cellSize = cv::Size(2, 2);

	}

	_parameters.showParas();

}

void randMatrix(cv::Mat & img, int64 seed, cv::Size cell=cv::Size(0,0))
{
	cv::RNG rng(seed);
	if (cell == cv::Size(0, 0) || cell.width > img.cols || cell.height > img.rows)
	{
		for (size_t j = 0; j < img.rows; ++j)
		{
			uchar* pdata = img.ptr<uchar>(j);
			for (size_t i = 0; i < img.cols; ++i)
			{
				pdata[i] = rng.uniform(0, 255);
			}
		}
	}
	else
	{
		size_t stepX =  img.cols / cell.width;
		size_t stepY =  img.rows / cell.height;

		for (size_t j = 0; j < img.rows; j+=stepY)
		{
			size_t lastY(j + stepY);
			if (lastY >= img.rows)
				lastY = img.rows - 1;

			for (size_t i = 0; i < img.cols; i += stepX)
			{
				size_t lastX(i+stepX);
				if (lastX >= img.cols)
					lastX = img.cols - 1;

				img.rowRange(j, lastY).colRange(i, lastX).setTo(rng.uniform(0,255));
			}
		}
	}
}

void addCross(cv::Mat & img, cv::Size cSzie, cv::Scalar scalar)
{
	int x_center = (img.cols - 1) / 2, y_center = (img.rows - 1) / 2;
	cv::Point
		P1_tl(x_center - (cSzie.width - 1) / 2, y_center - (cSzie.height - 1) / 2),
		P1_bd(x_center + (cSzie.width - 1) / 2, y_center + (cSzie.height - 1) / 2),
		P2_tl(x_center - (cSzie.height - 1) / 2, y_center - (cSzie.width - 1) / 2),
		P2_bd(x_center + (cSzie.height - 1) / 2, y_center + (cSzie.width - 1) / 2);

	cv::rectangle(img, P1_tl, P1_bd, scalar, -1);
	cv::rectangle(img, P2_tl, P2_bd, scalar, -1);
}

int main(int argn, char** argv)
{
	parameters _pa;
	getParas(argn, argv, _pa);

	cv::VideoWriter writer(_pa.save, CV_FOURCC('M', 'J','P','G'),
		double(_pa.fps), _pa.size);

	cv::Mat frame0 = cv::Mat::zeros(_pa.size, CV_8UC1);
	cv::Mat frame1 = cv::Mat::zeros(_pa.size, CV_8UC1);
	cv::Mat frame2 = cv::Mat::zeros(_pa.size, CV_8UC1);

	for (int i=0; i<_pa.nF; ++i)
	{
		randMatrix(frame0, _pa.seed + i, _pa.cellSize);
		addCross(frame0, _pa.crossSize, _pa.crossColor);
		randMatrix(frame1, 0.3*(_pa.seed + i), _pa.cellSize);
		addCross(frame1, _pa.crossSize, _pa.crossColor);
		randMatrix(frame2, 0.7*(_pa.seed + i), _pa.cellSize);
		addCross(frame2, _pa.crossSize, _pa.crossColor);

		cv::Mat f3;
		if(_pa.color)
			cv::merge(std::vector<cv::Mat>{frame0,frame1,frame2}, f3);
		else
			cv::merge(std::vector<cv::Mat>{frame0, frame0, frame0}, f3);

		writer << f3;
		if (_pa.show)
			cv::imshow("video", f3);

		cv::waitKey(10);
	}

	return 0;
}

　　

使用说明：

见help()