setting an ROI in C++.net

[mfg]

hi all,

im trying to set an ROI on the left border in an existing image with the following code:

Code: Select all

Emgu::CV::Image<Bgr^, Byte>^ img_work;
// .. create image ...
img_work->ROI = gcnew Emgu::CV::Rectangle<double>^(0,100,0,img_work->Height);
img_work = img_work->SmoothBlur(10,10);

when i try to execute this code, an unhandled exception occours with this message:
OpenCV: Bad input roi

does anybody know why this is not working?

Thanks, Fred.

[mfg]

hi all,

after an long trial and error marathon, i found out that the following code will work:

Code: Select all

img_work->ROI = gcnew Emgu::CV::Rectangle<double>(MCvRect(0, 0, 100, 100));
img_work->SmoothBlur(9,9)->CopyTo(img_work);
img_work->ROI = nullptr;

this code will smooth an area of 100x100 Pix at the left upper corner.

maybe the (obsolete) Rectangle<(Of <(T>)>)(T, T, T, T) constructor dont work, or i dont unterstand how to use it... i dont know...

( ok-ok-ok - in the first message, the SmoothBlur(10,10) throws also an exception, and the '^' after Rectangle<double> was false... )

Greetings from rainy Austria, Fred.

[canming]

maybe the (obsolete) Rectangle<(Of <(T>)>)(T, T, T, T) constructor dont work, or i dont unterstand how to use it... i dont know...

The original Rectangle has a constructor that accept 4 parameters in order different than the MCvRect, to avoid confusion, It has been obsoleted in 1.4.0.0 and it will be removed from 1.5.0.0.

the SmoothBlur(10,10) throws also an exception

It is because the cvSmooth function in OpenCV only accepts odd kernel size.