Blurring images using OpenCV

In the preceding section, we set up our editor application. In this section, we will add a simple feature of image editing—an action (both on the menu and the toolbar) to blur the image.

We will do this in two steps:

1. First, we will set up the UI and add the action, and then connect the action to a dummy slot.
2. Then, we will rewrite the dummy slot to blur the image, which will get the OpenCV library involved.

Adding the blur action

Most of the actions we will add in this chapter will be used to edit an image, so we should categorize them in a new menu and toolbar. First, we will declare three members, that is, the edit menu, the edit toolbar, and the blur action, in the private section of...