Conversion from IplImage* to cv::MAT

Question

I searched to convert an IplImage* to Mat, but all answers were about the conversion to cvMat.

How, can I do it? and what is the difference between Mat and cvMat?

Thanks in advance

Solution 1

here is a good solution

Mat(const IplImage* img, bool copyData=false);

Solution 2

For the records: taking a look at core/src/matrix.cpp it seems that, indeed, the constructor cv::Mat(IplImage*) has disappeared.

But I found this alternative:

IplImage * ipl = ...;
cv::Mat m = cv::cvarrToMat(ipl);  // default additional arguments: don't copy data.

Solution 3

The recommended way is the cv::cvarrToMat function

cv::Mat - is base data structure for OpenCV 2.x

CvMat - is old C analog of cv::Mat

Solution 4

Check out the Mat documentation.

// converts old-style IplImage to the new matrix; the data is not copied by default
Mat(const IplImage* img, bool copyData=false);

Solution 5

• cv::Mat or Mat, both are same.

• Mat has a operator CvMat() so simple assignment works

Convert Mat to CvMat

Mat mat = ---------;
CvMat cvmat = mat;

Convert CVMat to Mat

Mat dst = Mat(cvmat, true);  

Convert Mat to IplImage*

> For Single Channel

IplImage* image = cvCloneImage(&(IplImage)mat); 

> For Three Channel

IplImage* image = cvCreateImage(cvSize(mat.cols, mat.rows), 8, 3);
IplImage ipltemp = mat;
cvCopy(&ipltemp, image);

Hope this helps you. Cheers :)

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Comments

[Barshan Das]

Regarding cvMat and Mat , see the link: stackoverflow.com/questions/11037798/…

[Andrey Kamaev]

This constructor will be completely removed from the API in the next major update of the library

[Antonio]

@AndreyKamaev Are you sure about this? Shouldn't this constructor be marked as deprecated then?

[Micka]

afaik newer OpenCV versions (3.x) don't support this constructor anymore.

[Hossam Badri]

It has been a long time so :)

[Micka]

a curent question was linked to this answer, so I just wanted to mention that :)

[mojiiz]

@Micka For OpenCV 3.x you can use cv::cvarrToMat(ipl*). Below answer was answered this issue :)

[M_N1]

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