opencv_speec_test.cpp

opencv_speec_test.cpp

#include <cstddef>
#include <cstdint>
#include <time.h>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

#pragma comment(lib, "opencv_core249.lib")
#pragma comment(lib, "opencv_highgui249.lib")



template<typename _T>
void gray_at(cv::Mat_<_T> &M, const size_t iteration = 100) {
	for (size_t i = 0; i < iteration; ++i) {
		for (register int r = 0; r < UCHAR_MAX; ++r ) {
			for(register int c = 0; c < UCHAR_MAX; ++c ) {
				M.cv::Mat::at<uchar>(r,c) = r;  
			}
		}
	}
}


template<typename _T>
void gray_pointer(cv::Mat_<_T> &M, const size_t iteration = 100) {
	uchar* M_data = M.data; 
	for (size_t i = 0; i < iteration; ++i) {
		for (int r = 0; r < UCHAR_MAX; ++r) {
			for (int c = 0; c < UCHAR_MAX; ++c) {
				M_data[r * UCHAR_MAX + c] = r; 
			}
		}
	}
}

template<typename _T>
void gray_fast(cv::Mat_<_T> &M, const size_t iteration = 100){
	for (size_t i = 0; i < iteration; ++i) {
		uchar* M_ptr = M.data; 
		for (int r = 0; r < UCHAR_MAX; ++r) {
			for (int c = 0; c < UCHAR_MAX; ++c) {
				M_ptr[c] = r; 
			}
			M_ptr += M.step[0];   
		}
	}
}

template<typename _T>
void color_at (cv::Mat_<_T> &M, const size_t iteration = 100) {
	for (size_t i = 0; i < iteration; ++i) {
		for (int r = 0; r < UCHAR_MAX; ++r) {
			for (int c = 0; c < UCHAR_MAX; ++c) {
				cv::Vec3b &v = M.at<cv::Vec3b>(r,c);  
				v[0] = r;  
				v[1] = c; 
				v[2] = 0;
			} 
		}
	}
}

template<typename _T>
void color_pointer(cv::Mat_<_T> &M, const size_t iteration = 100) {
	uchar* const M_data = M.data;  
	for (size_t i = 0; i < iteration; ++i) {
		for (int r = 0; r < UCHAR_MAX; ++r) {
			for (int c = 0; c < UCHAR_MAX; ++c) {
				unsigned int offset = 3*(r * UCHAR_MAX + c);  
				M_data[offset]     = r;  
				M_data[offset + 1] = c; 
				M_data[offset + 2] = 0;    
			}
		}
	}
}

template<typename _T>
void color_fast(cv::Mat_<_T> &M, const size_t iteration = 100){
	for (size_t i = 0; i < iteration; ++i) {
		for (int r = 0; r < UCHAR_MAX; ++r) {
			uchar* M_ptr = M.data + M.step[0] * r;   
			for (int c = 0; c < UCHAR_MAX; ++c) {
				*M_ptr++ = r; 
				*M_ptr++ = c;   
				*M_ptr++ = 0;  
			} 
		}
	}
}

template<typename _T>
void color_iterator (cv::Mat_<_T> &M, const size_t iteration = 100) {
	for (size_t i = 0; i < iteration; ++i) {
		for (cv::Mat_<_T>::iterator it = M.begin(); it != M.end(); ++it) {
			auto position = it.pos();
			(*it)[0] = position.y;
			(*it)[1] = position.x;
			(*it)[2] = 0;
		}
	}
}


#define BENCH(FUNC, MAT) \
{\
	MAT = 0;\
	clock_t time = clock();\
	FUNC(MAT, bench_size);\
	printf("%-20s %10.3fμs/image = %10.1fkHz\n", #FUNC, \
	       double(clock() - time) / CLOCKS_PER_SEC / bench_size * 1000000, (double)bench_size * CLOCKS_PER_SEC / double(clock() - time) / 1000);\
	cv::imshow(#FUNC, MAT);\
}

int main(int argc, char **argv) {
	typedef uint8_t   GRAY_T;
	typedef cv::Vec3b COLOR_T;

	// Color char matrix
	const int bench_size = 10000;
	cv::Mat_<GRAY_T>  mc1 = cv::Mat_<GRAY_T>::zeros(UCHAR_MAX, UCHAR_MAX);
	cv::Mat_<COLOR_T> mc3 = cv::Mat_<COLOR_T>::zeros(UCHAR_MAX, UCHAR_MAX);

	BENCH(gray_at,        mc1);
	BENCH(gray_pointer,   mc1);
	BENCH(gray_fast,      mc1);

	BENCH(color_at,       mc3);
	BENCH(color_pointer,  mc3);
	BENCH(color_fast,     mc3);
	BENCH(color_iterator, mc3);


	cv::waitKey(0);
	return 0;
}

My Result

gray_at                  79.200μs/image =       12.6kHz
gray_pointer              9.300μs/image =      107.5kHz
gray_fast                 9.400μs/image =      106.4kHz
color_at                123.800μs/image =        8.1kHz
color_pointer            83.400μs/image =       12.0kHz
color_fast               76.800μs/image =       13.0kHz
color_iterator         1638.000μs/image =        0.6kHz

My Machine

------------------
System Information
------------------
Time of this report: 10/21/2012, 19:12:33
   Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120830-0333)
           Language: Japanese (Regional Setting: Japanese)
System Manufacturer: Gigabyte Technology Co., Ltd.
       System Model: EX58-UD3R
               BIOS: Award Modular BIOS v6.00PG
          Processor: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz (8 CPUs), ~2.7GHz
             Memory: 6144MB RAM
Available OS Memory: 6142MB RAM
          Page File: 4508MB used, 7774MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 32bit Unicode