OpenCV Mat、IplImage及unsigned char* 相互转换（C++）

基于OpenCV进行图像处理时，常常涉及Mat、IplImage及unsigned char* 数据格式间的相互转换，现实现如下：

1. unsigned char* 转Mat:

cv::Mat ucharArray2Mat(unsigned char* frame_char, int width, int height, int channel)
{
	cv::Mat image_mat;
	if (channel == 4)
		image_mat = cv::Mat(height, width, CV_8UC4, frame_char);
	if (channel == 3)
		image_mat = cv::Mat(height, width, CV_8UC3, frame_char);
	if (channel == 1)
		image_mat = cv::Mat(height, width, CV_8UC1, frame_char);
	return image_mat;
}

2. Mat转unsigned char*：

cv::Mat image_mat;
...
unsigned char* frame_char = image_mat.data;

3. unsigned char* 转IplImage:

IplImage* ucharArray2IplImage(unsigned char* frame_char, int width, int height, int channel)
{
	IplImage* iplImage = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, channel);
	memcpy(iplImage->imageData, frame_char, iplImage->height * iplImage->widthStep);
	return iplImage;
}

4. IplImage转unsigned char* :

IplImage* iplImage;
...
unsigned char* frame_char = iplImage->imageData;

5. Mat转IplImage:

IplImage* ucharArray2Mat(cv::Mat& image_mat)
{
	return (IplImage*)&image_mat;
}

6. IplImage转Mat:

cv::Mat ucharArray2Mat(IplImage* iplImage)
{
	return cv::cvarrToMat(iplImage);
}