average method

num average(
  1. List pixels
)

Helper funciton to compute the average of an array after dct caclulations

Implementation

num average(List pixels) {
  // Calculate the average value from top 8x8 pixels, except for the first one.
  var n = pixels.length - 1;
  return pixels.sublist(1, n).reduce((a, b) => a + b) / n;
}