imwrite error

asked 2014-07-25 09:02:00 -0500

ROSkinect
751 ●47 ●61 ●73

updated 2014-07-28 04:07:38 -0500

cv::imwrite("/home/jros/image.jpg",cv_ptr->image);

I want to save an image using imwrite but I get this error when I launch the node:

OpenCV Error: Unspecified error (could not find a writer for the specified extension) in imwrite_, file /home/guillaume/Developpement/libs/OpenCV-2.2.0/modules/highgui/src/loadsave.cpp, line 276
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/guillaume/Developpement/libs/OpenCV-2.2.0/modules/highgui/src/loadsave.cpp:276: error: (-2) could not find a writer for the specified extension in function imwrite_

Aborted (core dumped)

there is no error in compilation. It seems like an error in OpenCV version !?

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It would be better if you ask this question in StackOverflow, as I see that you are using a standalone OpenCV version. And by the way try updating your OpenCV first and retry, because your version is REALLY old. You could also try the cvSaveImage (old C implementation of imwrite) , docs on this link http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#imwrite

Mehdi. ( 2014-07-28 04:24:44 -0500 )edit

1

Instead of StackOverflow it would be even better to ask your question in http://answers.opencv.org

Martin Peris ( 2014-07-28 04:33:23 -0500 )edit

cvSaveImage is in C but I'm using C++ so it's imwrite. ya as I said maybe it's an old opencv version

ROSkinect ( 2014-07-28 04:46:02 -0500 )edit

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answered 2014-07-29 03:45:13 -0500

ROSkinect
751 ●47 ●61 ●73

The solutions that I found:

Either you change the OpenCV version to the latest one or use another library to save the image, example Visp:

#include <visp/vpImageConvert.h>
#include <visp/vpImageIo.h>

Mat image_mat;  
vpImageConvert::convert (image_mat, image_visp); //convert image_mat to image_visp
vpImageIo::write(image_visp,"*.jpg"); //save (you will find the image in /../../catkin_ws/*.jpg)

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answered 2014-07-25 10:08:09 -0500

DevonW
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Sounds like it is unable to use *.jpg files. Try another format?

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I tried all these extensions .pgm .jpg .png

ROSkinect ( 2014-07-28 04:05:50 -0500 )edit

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answered 2014-07-28 20:17:07 -0500

Martin Peris
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What kind of image is cv_ptr->image? According to OpenCV 2.2 documentation:

Only 8-bit (or 16-bit in the case of PNG, JPEG 2000 and TIFF) single-channel or 3-channel (with ‘BGR’ channel order) images can be saved using this function.

Make sure that cv_ptr->image is an 8 bit single-channel or 3-channel image.

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