opencv2.x新数据结构cv::Mat访问元素的方法

opencv2.0以后c++接口的API函数成为一种趋势，常用的IplImage与cvMat数据结构也淡出，新数据结构cv::Mat成为新宠。目前国内，新数据结构cv::Mat的资料还是比较少的。新数据结构cv::Mat元素的访问（读取、存取）的方法对很多初学者来还是很不明了的。

现在综合一些资料，在此抛砖引玉。

//http://blog.csdn.net/moc062066
//20111128
#include "opencv2/opencv.hpp"
#include 

using namespace std;
using namespace cv;
 
int main(int argc,char** argv)
{

	const char* filename = "google.png";
	
	//CV_8UC3
	//相应的CV_8SC3---Vec3s
	//相应的CV_16UC3---Vec3w
	Mat mat_CV_8UC3 = imread(filename,IMREAD_COLOR);
   for( size_t nrow = 0; nrow < mat_CV_8UC3.rows; nrow++)
    {
	   for(size_t ncol = 0; ncol < mat_CV_8UC3.cols; ncol++)
	   {
		   Vec3i bgr = mat_CV_8UC3.at(nrow,ncol);//用Vec3b也行
		   cout   << "("<(nrow);
	   for(size_t ncol = 0; ncol < mat_CV_8UC3.cols * mat_CV_8UC3.channels(); ncol++)
	   {
			cout << int( data[ncol] ) ;
	   }
	   cout << endl;
    }

   //------CV_8UC1----------start---
   //
	Mat mat_CV_8UC1 = imread(filename,IMREAD_GRAYSCALE);
   for( size_t nrow = 0; nrow < mat_CV_8UC1.rows; nrow++)
   {
	   for(size_t ncol = 0; ncol < mat_CV_8UC1.cols; ncol++)
	   {
		   uchar val = mat_CV_8UC1.at(nrow,ncol);
		   //
		   cout << (int(val) > 200 ? 1 :0) ;//cout<(row);
		for ( size_t col = 0 ; col < mat_CV_8UC1.cols ; ++col) 
		{
			cout << ( int(ptr[col]) > 200 ? 1 :0) ;//cout< it = mat_CV_8UC1.begin(), it_end = mat_CV_8UC1.end();
   for(int cnt = 1; it != it_end; ++it)
    {
      	cout << ( int(*it) > 200 ? 1 : 0) ;
      	if( (cnt++ % mat_CV_8UC1.cols) ==0 )
      		cout << endl;    	
    }
   //------CV_8UC1----------end---   

    
  return 0;
}

参考：1

所有图像：

 结果：

(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(223,226,244)(189,195,244)(169,173,241)(169,174,240)(189,193,240)(216,217,239)(242,242,242)(244,244,244)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(242,243,244)(190,197,245)(115,122,246)(79,81,239)(86,85,231)(85,84,228)(64,57,232)(65,56,239)(80,75,242)(117,116,236)(177,179,233)(238,238,238)(243,243,243)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(225,228,244)(134,145,248)(65,67,244)(128,130,223)(191,192,212)(212,212,212)(213,213,213)(201,201,211)(142,142,210)(59,45,225)(67,53,238)(76,64,238)(112,106,228)(217,218,231)(241,241,241)(245,245,245)
(245,245,245)(245,245,245)(223,227,244)(118,129,248)(65,67,243)(154,158,213)(207,207,207)(215,215,215)(226,226,226)(231,231,231)(232,232,232)(227,227,227)(174,175,212)(53,34,216)(62,45,234)(66,48,234)(92,82,224)(217,218,227)(241,241,241)
(245,245,245)(236,238,245)(128,139,248)(77,81,248)(106,107,213)(201,201,201)(216,216,216)(233,233,233)(242,242,242)(244,244,244)(245,245,245)(243,243,243)(236,236,236)(143,142,209)(46,22,217)(58,39,232)(55,30,229)(102,94,217)(229,229,229)
(245,245,245)(168,178,244)(91,99,250)(56,51,236)(154,155,196)(209,209,209)(232,232,232)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(244,244,244)(232,232,235)(70,54,205)(49,25,223)(52,29,228)(47,19,220)(166,168,211)
(229,231,243)(98,107,246)(75,80,248)(54,44,222)(176,177,195)(220,220,220)(240,240,240)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(243,243,243)(139,136,216)(46,19,215)(49,25,226)(47,17,217)(94,84,200)
(184,190,244)(75,78,247)(63,62,245)(56,44,213)(186,187,197)(226,226,226)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(202,203,231)(47,22,212)(48,21,223)(46,17,215)(55,31,195)
(143,151,242)(63,62,245)(57,53,241)(55,41,213)(185,186,199)(228,228,228)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(233,233,239)(66,48,214)(48,19,221)(46,17,212)(42,13,190)
(106,114,244)(56,51,243)(55,47,239)(48,31,217)(169,170,199)(227,227,227)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(244,244,244)(98,86,216)(47,17,220)(44,15,209)(39,9,183)
(113,120,239)(51,40,238)(53,43,239)(47,29,221)(146,147,200)(224,224,224)(242,242,242)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(116,106,221)(47,16,219)(43,13,203)(38,10,173)
(146,150,229)(49,32,229)(51,39,236)(48,30,225)(113,111,203)(219,219,219)(239,239,239)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(121,113,224)(46,15,218)(42,11,194)(47,26,165)
(191,194,232)(46,26,216)(49,33,228)(49,31,229)(69,58,214)(209,210,212)(236,236,236)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(116,105,225)(46,13,214)(38,7,178)(83,72,165)
(238,238,240)(85,73,208)(46,23,214)(49,30,227)(48,27,224)(161,163,207)(230,230,230)(244,244,244)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(93,79,224)(43,10,201)(34,5,159)(146,144,179)
(244,244,244)(182,183,221)(42,16,195)(45,22,211)(48,25,225)(82,71,217)(219,219,219)(239,239,239)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(216,217,239)(55,26,217)(38,6,174)(81,70,161)(197,197,197)
(245,245,245)(240,240,240)(122,118,201)(40,12,185)(45,19,206)(48,22,223)(126,124,216)(230,230,230)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(122,112,227)(41,7,191)(61,43,160)(181,181,189)(211,211,211)
(245,245,245)(244,244,244)(235,235,235)(116,107,190)(38,11,174)(43,14,196)(47,18,217)(128,122,219)(224,225,232)(242,242,242)(245,245,245)(245,245,245)(232,232,243)(132,120,229)(43,9,197)(75,60,171)(179,179,192)(207,207,207)(229,229,229)
(245,245,245)(245,245,245)(243,243,243)(232,232,232)(158,156,199)(67,51,170)(38,10,178)(43,12,201)(63,41,216)(121,112,223)(141,134,228)(117,105,225)(65,39,212)(56,31,193)(131,125,191)(201,201,203)(210,210,210)(228,228,228)(240,240,240)
(245,245,245)(245,245,245)(245,245,245)(243,243,243)(234,234,234)(219,219,220)(162,160,195)(120,113,182)(85,74,183)(71,53,189)(82,67,196)(115,105,200)(153,149,202)(201,201,209)(210,210,210)(218,218,218)(232,232,232)(241,241,241)(244,244,244)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(244,244,244)(239,239,239)(232,232,232)(223,223,223)(216,216,216)(211,211,211)(211,211,211)(214,214,214)(217,217,217)(222,222,222)(230,230,230)(237,237,237)(243,243,243)(245,245,245)(245,245,245)
(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(245,245,245)(244,244,244)(241,241,241)(237,237,237)(234,234,234)(233,233,233)(234,234,234)(236,236,236)(240,240,240)(243,243,243)(245,245,245)(245,245,245)(245,245,245)(245,245,245)
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245223226244189195244169173241169174240189193240216217239242242242244244244245245245245245245245245245245245245
245245245245245245245245245245245245242243244190197245115122246798123986852318584228645723265562398075242117116236177179233238238238243243243245245245245245245
2452452452452452452452452452252282441341452486567244128130223191192212212212212213213213201201211142142210594522567532387664238112106228217218231241241241245245245
24524524524524524522322724411812924865672431541582132072072072152152152262262262312312312322322322272272271741752125334216624523466482349282224217218227241241241
245245245236238245128139248778124810610721320120120121621621623323323324224224224424424424524524524324324323623623614314220946222175839232553022910294217229229229
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2452452452402402401221182014012185451920648222231261242162302302302432432432452452452452452452452452452452452452452452451221122274171916143160181181189211211211
2452452452442442442352352351161071903811174431419647182171281222192242252322422422422452452452452452452322322431321202294391977560171179179192207207207229229229
245245245245245245243243243232232232158156199675117038101784312201634121612111222314113422811710522565392125631193131125191201201203210210210228228228240240240
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245245245245245245245245245245245245244244244239239239232232232223223223216216216211211211211211211214214214217217217222222222230230230237237237243243243245245245245245245
245245245245245245245245245245245245245245245245245245244244244241241241237237237234234234233233233234234234236236236240240240243243243245245245245245245245245245245245245
1111111111111111111
1111111111111111111
1111111111111111111
1111111111111111111
1111111110011111111
1111110000000001111
1111000011100000111
1110001111110000011
1100011111111000001
1000011111111100000
1000011111111100000
1000011111111110000
0000011111111110000
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0000011111111110000
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1000011111111110000
1000001111111110000
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1100000111111100001
1110000011111000011
1111000000000001111
1111110000000111111
1111111111111111111
1111111111111111111

1111111111111111111
1111111111111111111
1111111111111111111
1111111111111111111
1111111110011111111
1111110000000001111
1111000011100000111
1110001111110000011
1100011111111000001
1000011111111100000
1000011111111100000
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1100000111111100001
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1111000000000001111
1111110000000111111
1111111111111111111
1111111111111111111

1111111111111111111
1111111111111111111
1111111111111111111
1111111111111111111
1111111110011111111
1111110000000001111
1111000011100000111
1110001111110000011
1100011111111000001
1000011111111100000
1000011111111100000
1000011111111110000
0000011111111110000
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1000011111111110000
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1100000111111100001
1110000011111000011
1111000000000001111
1111110000000111111
1111111111111111111
1111111111111111111