message: Update imgproc.hpp
  fix Rect value of integral image example;
diff: @@ -2725,7 +2725,7 @@ It makes possible to do a fast blurring or fast block correlation with a variabl
  example. In case of multi-channel images, sums for each channel are accumulated independently.
  As a practical example, the next figure shows the calculation of the integral of a straight
  -rectangle Rect(3,3,3,2) and of a tilted rectangle Rect(5,1,2,3) . The selected pixels in the
  +rectangle Rect(4,4,3,2) and of a tilted rectangle Rect(5,1,2,3) . The selected pixels in the
  original image are shown, as well as the relative pixels in the integral images sum and tilted .
  ![integral calculation example](pics/integral.png)
  