为什么垫子类型不同？答案

【问题标题】：Why the mat type is different?为什么垫子类型不同？
【发布时间】：2014-02-25 19:33:14
【问题描述】：

我将图片加载到 original_pre，大小为 160x60，以下是代码

original_pre = cvLoadImage(input, 0);
int border = 5;
CvMat* original_mat = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border, CV_8UC3);
original = cvCreateImage(cvSize(original_pre->width-2*border, original_pre->height-2*border), original_pre->depth, original_pre->nChannels);
cvGetSubRect(original_pre, original_mat, cvRect(border,border,original_pre->width-2*border,original_pre->height-2*border));

cvFloodFill(original_mat,cvPoint(0,0),cvScalarAll(0),cvScalarAll(1),cvScalarAll(1));
CvMat* original_open_mat = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border, CV_8UC3);
CvMat* temp = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border, CV_8UC3);
cout<<original_mat->width<<" "<<original_mat->height<<" "<<original_open_mat->width<<" "<<original_open_mat->height<<" "<<CV_MAT_TYPE(original_mat->type)<<" "<<CV_MAT_TYPE(original_open_mat->type)<<" "<<CV_8UC3<<endl;
cvMorphologyEx(original_mat,original_open_mat,temp,NULL,CV_MOP_OPEN);

floodfill 操作后 original_mat 和 original_open_mat 的类型不同。打印的结果是

150 50 150 50 0 16 16
OpenCV Error: Assertion failed (src.size() == dst.size() && src.type() == dst.type()) in cvMorphologyEx, file /home/ataosky/software/OpenCV-2.4.3/modules/imgproc/src/morph.cpp, line 1353

original_mat 的类型为 0，而 original_open_mat 的类型为 16。为什么？

【问题讨论】：

标签： c++ opencv image-processing computer-vision

【解决方案1】：

我用一个简单的图像运行你的代码，它工作得很好。这是代码和结果。我假设 original_pre 和 original 属于 IplImage* 类型，因为它们不存在于您的代码块中。

IplImage*   original_pre = cvLoadImage("G:\\test.png");
int border = 5;
    CvMat* original_mat = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border, CV_8UC3);
IplImage* original = cvCreateImage(cvSize(original_pre->width-2*border, original_pre->height-2*border), original_pre->depth, original_pre->nChannels);
cvGetSubRect(original_pre, original_mat, cvRect(border,border,original_pre->width- 2*border,original_pre->height-2*border));

cvFloodFill(original_mat,cvPoint(50,55),cvScalarAll(255),cvScalarAll(0),cvScalarAll(0));
CvMat* original_open_mat = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border, CV_8UC3);
CvMat* temp = cvCreateMat(original_pre->height-2*border, original_pre->width-2*border,  CV_8UC3);
cout<<original_mat->width<<" "<<original_mat->height<<" "<<original_open_mat->width<<" "<<original_open_mat->height<<" "<<CV_MAT_TYPE(original_mat->type)<<" "<<CV_MAT_TYPE(original_open_mat->type)<<" "<<CV_8UC3<<endl;
cvMorphologyEx(original_mat,original_open_mat,temp,NULL,CV_MOP_OPEN);
cvSaveImage("G:\\temp_.jpg",original_open_mat);

原图

结果

【讨论】：