OpenCV中矩阵深度类型转换

      在OpenCV中，cv::Mat类提供了一个名为converTo的方法来进行矩阵类型转换。当然使用时需要注意的是，该函数只能进行矩阵深度类型的转换，而不能进行矩阵通道数的转换。若需要进行矩阵通道数的转换，可能需要采取进行其他的方法来变通实现。下面对该函数进行测试。

      程序源代码

/** 根据自己机器上的OpenCV版本定义宏
* 例如使用OpenCV 2.1，则定义宏RC_OPENCV_2_1_0；
* 使用OpenCV 2.2，则定义宏RC_OPENCV_2_2_0；
* 以此类推
*/
#define RC_OPENCV_2_3_0

#ifdef _DEBUG

#ifdef RC_OPENCV_2_1_0
#pragma comment( lib, "cxcore210d.lib" )
#pragma comment( lib, "cv210d.lib" )
#pragma comment( lib, "highgui210d.lib" )
#endif

#ifdef RC_OPENCV_2_2_0
#pragma comment( lib, "opencv_core220d.lib" )
#pragma comment( lib, "opencv_highgui220d.lib" )
#pragma comment( lib, "opencv_imgproc220d.lib" )
#endif

#ifdef RC_OPENCV_2_3_0
#pragma comment( lib, "opencv_core230d.lib" )
#pragma comment( lib, "opencv_highgui230d.lib" )
#pragma comment( lib, "opencv_imgproc230d.lib" )
#endif

#else

#ifdef RC_OPENCV_2_1_0
#pragma comment( lib, "cxcore210.lib" )
#pragma comment( lib, "cv210.lib" )
#pragma comment( lib, "highgui210.lib" )
#endif

#ifdef RC_OPENCV_2_2_0
#pragma comment( lib, "opencv_core220.lib" )
#pragma comment( lib, "opencv_highgui220.lib" )
#pragma comment( lib, "opencv_imgproc220.lib" )
#endif

#ifdef RC_OPENCV_2_3_0
#pragma comment( lib, "opencv_core230.lib" )
#pragma comment( lib, "opencv_highgui230.lib" )
#pragma comment( lib, "opencv_imgproc230.lib" )
#endif

#endif

#include <cv.h>
#include <highgui.h>
#include <iostream>

int main( int argc, char** argv )
{
/** 构造一个10行10列、深度为32位、3通道的矩阵，矩阵元素初始化为10 */
cv::Mat matOrigin( 10, 10, CV_32FC3, cv::Scalar(10) );

/** 转换为深度为8位、3通道的矩阵 */
cv::Mat mat8UC3Converted;
matOrigin.convertTo( mat8UC3Converted, CV_8UC3, 1, 0 );

if ( CV_8UC3 == mat8UC3Converted.type() )
{
std::cout << "mat8UC3Converted 转换成功。" << std::endl;
}
else
{
std::cout << "mat8UC3Converted 转换失败。" << std::endl;
}

/** 转换为深度为8位、1通道的矩阵 */
cv::Mat mat8UC1Converted;
matOrigin.convertTo( mat8UC1Converted, CV_8UC1, 1, 0 );

if ( CV_8UC1 == mat8UC1Converted.type() )
{
std::cout << "mat8UC1Converted 转换成功。" << std::endl;
}
else
{
std::cout << "mat8UC1Converted 转换失败。" << std::endl;
}

system( "pause" );

return 0;
}

      测试结果