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Converting Mat to IplImage in Java

asked 2013-05-26 11:31:02 -0500

agile gravatar image

How can I convert Mat image to IplImage using Opencv4 android / javacv. I am using opencv for face detection but I need javacv for face recognition. and the face recognizer class require CvArr/IplImage as an input for the train method.

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answered 2013-08-18 12:37:50 -0500

agile gravatar image

updated 2013-08-18 12:39:25 -0500

I solved the problem by Converting Mat to Bitmap and then Bitmap to IplImage. There is a mehtod available in OpenCV for Android for coverting Mat to Bitmap and in JavaCV for converting Bitmap to IplImage.

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Im having the same problem, can you post the code with yoir solution?

LopeLH gravatar imageLopeLH ( 2014-10-23 13:49:41 -0500 )edit
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answered 2014-05-22 11:25:41 -0500

Axel gravatar image

Is there a way to convert Mat to IplImage for a java application? This solution you are giving only works in android (bitmap)?

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it's probably wise to stick to one wrapper library here. opencv's and the javacv wrappers are basically incompatible(as javacv is mostly wrapping the deprecated c-api).

berak gravatar imageberak ( 2014-05-22 11:31:47 -0500 )edit

So you are pretty much saying that is not possible to cast mat to IplImage?

Axel gravatar imageAxel ( 2014-05-22 11:43:31 -0500 )edit

don't know javacv too well, but definitely not from opencv's java wrappers

berak gravatar imageberak ( 2014-05-22 11:48:23 -0500 )edit

I am developing an app in java where you can detect faces and record the footage at the same time. I need Mat in order to make the detection work, but if i want to record live footage from web cam I need to IplImage and that crashes the app unless I have two web cams running at the same time working separately.

Axel gravatar imageAxel ( 2014-05-22 11:55:38 -0500 )edit

aww, i see. so writing to video files is what got you into using javacv ?

(no real good idea here)

berak gravatar imageberak ( 2014-05-22 12:01:44 -0500 )edit

No. Object detection and Facial recognition got me into it, but I also wanted to record the footage.

Axel gravatar imageAxel ( 2014-05-22 12:08:23 -0500 )edit
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k,k. i see. you could clearly do the object detection from plain opencv, but face reco would need additional jni.

btw, you can do :

 byte[] pixels; // from iplimage, if there's such a thing
 Mat m = new Mat(h,w,type); 
 m.put(0,0,pixels);

but i don't know the other direction (to IplImage)

berak gravatar imageberak ( 2014-05-22 12:14:32 -0500 )edit
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Asked: 2013-05-26 11:31:02 -0500

Seen: 2,841 times

Last updated: May 22 '14