Hi,

I'm not sure if this should go to ros-users or the opencv mailing list, but I'm
getting a runtime error in cv::Canny():

OpenCV Error: Unsupported format or combination of formats () in cvCanny, file
/opt/ros/cturtle/stack/vision_opencv/opencv2/build/opencv-svn/modules/imgproc/src/canny.cpp,
line 66
terminate called after throwing an instance of 'cv::Exception'

Here's my code:

  Mat1b I2, E;
  I = 256*I;  // I is a Mat1d
  I.assignTo(I2, DataType<uchar>::type);
  I = I/256;
  E.create(I2.size());
  Canny(I2,E,100,240);

I'm also getting some warnings during compilation about the opencv headers:

In file included from /u/jglov/lis/bookbot/src/bookFinder.cpp:2:
/opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/include/opencv/cv.h:47:2:
warning: #warning "This is a deprecated opencv header provided for
compatibility. Please include a header from a corresponding opencv module"
In file included from
/opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/include/opencv/cv.h:64,
                 from /u/jglov/lis/bookbot/src/bookFinder.cpp:2:
/opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/include/opencv2/core/internal.hpp:297:1:
warning: "CV_IMPL" redefined
In file included from /u/jglov/lis/bookbot/src/bookFinder.cpp:2:
/opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/include/opencv/cv.h:60:1:
warning: this is the location of the previous definition
/opt/ros/cturtle/stacks/vision_opencv/opencv2/opencv/include/opencv/cv.h:67:8:
warning: extra tokens at end of #endif directive

I've attached the manifest.xml and CMakeLists.txt of the project for reference.

Thanks,
Jared