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

Regarding cvMat and Mat , see the link: http://stackoverflow.com/questions/11037798/difference-between-cvmat-mat-and-ipimage — Barshan Das, Apr 10 '13 at 11:58

score 44 · Answer 1 · answered Jun 15 '15 at 16:01

44

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.

answered Jun 15 '15 at 16:01

Moein

Original [source](https://answers.opencv.org/question/23440/any-way-to-convert-iplimage-to-cvmat-in-opencv-300/) for this answer... – M_N1 Jul 20 '20 at 11:30

score 14 · Accepted Answer · answered Apr 22 '13 at 09:44

14

here is a good solution

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

answered Apr 22 '13 at 09:44

Houssam Badri

4

afaik newer OpenCV versions (3.x) don't support this constructor anymore. – Micka May 10 '16 at 11:14
It has been a long time so :) – Houssam Badri May 10 '16 at 11:30
a curent question was linked to this answer, so I just wanted to mention that :) – Micka May 10 '16 at 13:11
8

@Micka For OpenCV 3.x you can use cv::cvarrToMat(ipl*). Below answer was answered this issue :) – mojiiz Jun 28 '16 at 15:19

score 11 · Answer 3 · answered Apr 10 '13 at 11:56

11

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

answered Apr 10 '13 at 11:56

Andrey Kamaev

score 5 · Answer 4 · answered Apr 10 '13 at 11:57

5

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

answered Apr 10 '13 at 11:57

Safir

2

This constructor will be completely removed from the API in the next major update of the library – Andrey Kamaev Apr 10 '13 at 11:59
@AndreyKamaev Are you sure about this? Shouldn't this constructor be marked as deprecated then? – Antonio Nov 28 '13 at 08:51

score 4 · Answer 5 · answered Jan 12 '16 at 04:05

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 :)

5 Answers5