Image Noise: Replicated versus Original

Each of the pre and post images was registered to its corresponding 550 nm image, and then a 30 by 30 pixel block of pixels was extracted from the center each square of the Macbeth Color Checker. To get a visual sense of the noise, we plotted the values from a replicated image against those for the original image. Such a plot is shown here for the BearFruitGrayB pre image. If there were no noise, then all the points would plot along the diagonal. Each cluster of points in the plot comes from one MCC square. (Note, the plot shows only a random subsample of the data that were analyzed quantitatively.) It is clear from the plot that the noise increases with the mean intensity level.

Authors: David Brainard and Elizabeth Harding