Converting cv::Mat to IplImage*

cvcloneimage
cviplimage
what is cvmat
iplimage to cvarr
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opencv mat::step
opencv mat type
cvarrtomat

The documentation on this seems incredibly spotty.

I've basically got an empty array of IplImage*s (IplImage** imageArray) and I'm calling a function to import an array of cv::Mats - I want to convert my cv::Mat into an IplImage* so I can copy it into the array.

Currently I'm trying this:

while(loop over cv::Mat array)
{
    IplImage* xyz = &(IplImage(array[i]));
    cvCopy(iplimagearray[i], xyz);
}

Which generates a segfault.

Also trying:

while(loop over cv::Mat array)
{
    IplImage* xyz;
    xyz = &array[i];
    cvCopy(iplimagearray[i], xyz);
}

Which gives me a compile time error of: error: cannot convert ‘cv::Mat*’ to ‘IplImage*’ in assignment

Stuck as to how I can go further and would appreciate some advice :)

cv::Mat is the new type introduce in OpenCV2.X while the IplImage* is the "legacy" image structure.

Although, cv::Mat does support the usage of IplImage in the constructor parameters, the default library does not provide function for the other way. You will need to extract the image header information manually. (Do remember that you need to allocate the IplImage structure, which is lack in your example).

Convert cv::Mat into IplImage*, C++ · OpenCV. I want to convert cv::Mat image into IplImage and otherway around.please help me..thanks. Posted 26-Sep-13 17:21pm. DianaDil. Add a Solution  PRAKASH said. Thanks for this article. I would be able to run the IplImage to Mat conversion but I am getting problem with mat to IplImage program I am running the following code in VS 2008 using OpenCV 2.4.6

Mat image1;
IplImage* image2=cvCloneImage(&(IplImage)image1);

Guess this will do the job.

Edit: If you face compilation errors, try this way:

cv::Mat image1;
IplImage* image2;
image2 = cvCreateImage(cvSize(image1.cols,image1.rows),8,3);
IplImage ipltemp=image1;
cvCopy(&ipltemp,image2);

Mat, CvMat & IplImage - Zixuan Wang, Mat M; IplImage img = M; IplImage img = IplImage(M); //Deep Copy cv::Mat img2; function is used to convert an old-style 2D array ( CvMat or IplImage ) to Mat . cv::Mat is the new type introduce in OpenCV2.X while the IplImage* is the "legacy" image structure. Although, cv::Mat does support the usage of IplImage in the constructor parameters, the default library does not provide function for the other way. You will need to extract the image header information manually.

 (you have cv::Mat old)
 IplImage copy = old;
 IplImage* new_image = ©

you work with new as an originally declared IplImage*.

convert mat to iplimage - OpenCV Q&A Forum, hi to all! i have a simple questioncan i convert a Mat imege into a cv::Mat mat_img; IplImage ipl_img = mat_img.operator IplImage();. Converting cv::Mat to IplImage* (4) cv::Mat is the new type introduce in OpenCV2.X while the IplImage* is the "legacy" image structure. Although, cv::Mat does support the usage of IplImage in the constructor parameters, the default library does not provide function for the other way.

Personaly I think it's not the problem caused by type casting but a buffer overflow problem; it is this line

cvCopy(iplimagearray[i], xyz);   

that I think will cause segment fault, I suggest that you confirm the array iplimagearray[i] have enough size of buffer to receive copyed data

Interoperability with OpenCV 1, These objects may be freely converted to both IplImage and CvMat with simple assignment. Mat I = cv::cvarrToMat(IplI); // Convert to the new style container. image_opencv.o: error: conversion from 'cv::Mat' to non-scalar type 'IplImage {aka _IplImage}' requested #1997 XRNGX opened this issue Jan 17, 2020 · 5 comments Comments

According to OpenCV cheat-sheet this can be done as follows:

IplImage* oldC0 = cvCreateImage(cvSize(320,240),16,1);
Mat newC = cvarrToMat(oldC0);

The cv::cvarrToMat function takes care of the conversion issues.

Converting cv::Mat to IplImage* - c++ - android, I've basically got an empty array of IplImage*s (IplImage** imageArray) and I'm calling a function to import an array of cv::Mats - I want to convert my cv::Mat into  How to convert OpenCV cv::mat to System Bitmap to System ImageSource Posted in Computing , Programming By FraserG On July 23, 2015 OpenCV is an open source computer vision library which can be used for a wide variety of things such as face recognition, people detection, motion tracking, video editing and image manipulation.

cv::cvarrToMat link error and mat to Ipimage error!!! · Issue #16149 , 2: cv:mat to IpImage error code: IplImage *ipl = new IplImage; *ipl = &IplImage(​mat); error: error C2440: '': cannot convert from 'cv::Mat' to  The underlying matrix of an image may be copied using the cv::Mat::clone() and cv::Mat::copyTo() functions. Storing methods . This is about how you store the pixel values. You can select the color space and the data type used. The color space refers to how we combine color components in order to code a given color.

compile error: cannot convert from 'const cv::Mat' to 'IplImage' with , compile error: cannot convert from 'const cv::Mat' to 'IplImage' with dlib 19.19 and OpenCV 4.2.0 #1955. Closed. leonyu1010 opened this issue  compile error: cannot convert from 'const cv::Mat' to 'IplImage' with dlib 19.19 and OpenCV 4.2.0 #1955 Closed leonyu1010 opened this issue Dec 24, 2019 · 5 comments

The conversion and copy CvMat, Mat and between IplImage , I've basically got an empty array of IplImage*s (IplImage** imageArray) and I'm calling a function to import an array of cv::Mats - I want to convert 

Comments
  • possible duplicate of OpenCV C++ and cvSmooth
  • Update: from OpenCV 4, IplImage and all of what they now call "the legacy C API" will be progressively removed. In OpenCV 4.0 "alpha", IplImage is already gone - as is CvMat.
  • It does provide a conversion to IplImage, creating a header without copying the data. So IplImage* img = new IplImage(mat); should work.
  • Actually, you can do this: IplImage iplimg = mat; and just use &iplimg wherever you need an IplImage. There is no need for dynamic allocation.
  • @etarion The IplImage doesn't have any function which can do that conversion. Why does IplImage* img = new IplImage(mat) is working?
  • @ajaxhe cv::Mat has a conversion operator to IplImage.
  • This answer is false. See other answers, it can be converted very easily, should be removed from accepted answer as it might confuse other users.
  • Could you explain this snippet ?
  • @chepseskaf cast syntax explicit conversion.
  • @William: I am getting taking address of temporary warning while using above code
  • That's a suboptimal solution as you need to copy pixels manually.
  • Did you manage to convert it using only the header? Also, IplImage is obsolete. If you need efficient code, use cv::Mat instead.
  • this is the best way and it works as like a charm! all the other ways are too complicated and this is the best one. Worked for me
  • I think cvarrToMat no longer exists in opencv 2.4.5