Add noisy effect to image in R
Following code generates some images with a blue circle on a white background with some white polygons inside the circle. The color of the circle is variable around blue. I want to add some sort of noise as the image below inside the blue circle. I am assuming it will have to do creating a random noise matrix and then merging that layer on top of the image or merging between the blue circle and white polygon layers. I do not know how to achieve this.