[GitHub] sxjscience opened a new pull request #8757: [ImageIO] Fix image io for opencv3.3

[GitBox <gi...@apache.org>]

sxjscience opened a new pull request #8757: [ImageIO] Fix image io for opencv3.3
URL: https://github.com/apache/incubator-mxnet/pull/8757
 
 
   ## Description ##
   Starting from OpenCV3.3 the `imdecode` function will automatically rotate the image based on the EXIF' orientation flag.
   ```c++
   Mat imdecode( InputArray _buf, int flags )
   {
       CV_TRACE_FUNCTION();
   
       Mat buf = _buf.getMat(), img;
       imdecode_( buf, flags, LOAD_MAT, &img );
   
       /// optionally rotate the data if EXIF' orientation flag says so
       if( !img.empty() && (flags & IMREAD_IGNORE_ORIENTATION) == 0 && flags != IMREAD_UNCHANGED )
       {
           ApplyExifOrientation(buf, img);
       }
   
       return img;
   }
   ```
   
   This can be disabled by setting the `cv::IMREAD_IGNORE_ORIENTATION` flag.
   
   ## Checklist ##
   ### Essentials ###
   - [x] Passed code style checking (`make lint`)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - [ ] All changes have test coverage
   - [x] For user-facing API changes, API doc string has been updated. For new C++ functions in header files, their functionalities and arguments are well-documented. 
   - [x] To my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - [ ] add `IMREAD_IGNORE_ORIENTATION` flag when opencv 3.3 is used.
   
   ## Comments ##
   

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