title: Using openCV Blur with BORDER_CONSTANT option?
body: <p>I am trying to creating a blurring function that can take all possible padding options. However for BORDER_CONSTANT you also need to provide the color, i.e. the numbers that you want to pad your image with. In opencv's documentation of blur I don't see an overload of function blur that takes padding and the color value. Does anyone know how to overcome this? </p>
  
  <p>One thing I thought about doing was padding the image first and the blurring some region of interest with no padding at all, although I can't find a way to do that.</p>
  
  <p>The question referred to was asked by me, so basically I would know if this was a duplicated. This question was relating to cv::blur which also handles padding, however does not have an option of adding the border values for BORDER_CONSTANT. I was asking if anyone knows a workaround.</p>