3030. Find the Grid of Region Average

You are given m x n grid image which represents a grayscale image, where image[i][j] represents a pixel with intensity in the range [0..255]. You are also given a non-negative integer threshold. Two pixels are adjacent if they share an edge. A region is a 3 x 3 subgrid where the absolute difference in intensity between any two adjacent pixels is less than or equal to threshold. All pixels in a