本文介绍了为什么断言失败了的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
为什么当我创建一个 CvMat *
时,断言失败?在cv :: Mat中使用指针加载图片时不会发生。
Why does the assertion fail here when i create a CvMat *
? It does not happen with an image i load in cv::Mat using a pointer.
struct RGB { unsigned char b, g, r; };
cv::Point p;
RGB *data;
CvMat* mat = cvCreateMat(300,300,CV_32FC1);
for( row = 0; row < mat->rows; ++row)
{
for ( col = 0; col < mat->cols; ++col)
{
p.x=row,p.y=col;
ERROR ----->>> assert((mat->step/mat->cols) == sizeof(RGB));
data = (RGB*)&mat->data;
data += p.y * mat->cols + p.x;
}
}
对于此代码,断言不会失败: p>
For this code the assertion does not fail:
IplImage * img=cvLoadImage("blah.jpg");
int row=0,col=0;
cv::Mat in(img);
cv::Mat *mat=∈
cv::Point p;
struct RGB { unsigned char b, g, r; };
RGB *data;
for( row = 0; row < mat->rows; ++row)
{
for ( col = 0; col < mat->cols; ++col)
{
p.x=row,p.y=col;
assert((mat->step/mat->cols) == sizeof(RGB));
data = (RGB*)&mat->data;
data += p.y * mat->cols + p.x;
printf("Row=%dxCol=%d b=%u g=%u r=%u\n",row,col,data->b,data->g,data->r);
wait_for_frame(1);
}
}
推荐答案
sizeof(RGB)!= sizeof(float)
,这是你在这里填写的矩阵:
Because sizeof(RGB) != sizeof(float)
, which is what you filled the matrix with here:
CvMat* mat = cvCreateMat(300,300,CV_32FC1);
CV_32FC1
表示1个组件,32位浮点。您可能需要 CV_8UC3
。请参见或其他OpenCV参考。
CV_32FC1
means 1 component, 32-bit floating point. You probably want CV_8UC3
. See here or another OpenCV reference.
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