Package g0601_0700.s0661_image_smoother

Class Solution

java.lang.Object
g0601_0700.s0661_image_smoother.Solution
public class Solution extends java.lang.Object
661 - Image Smoother.

Easy

An image smoother is a filter of the size 3 x 3 that can be applied to each cell of an image by rounding down the average of the cell and the eight surrounding cells (i.e., the average of the nine cells in the blue smoother). If one or more of the surrounding cells of a cell is not present, we do not consider it in the average (i.e., the average of the four cells in the red smoother).

Given an m x n integer matrix img representing the grayscale of an image, return the image after applying the smoother on each cell of it.

Example 1:

Input: img = [[1,1,1],[1,0,1],[1,1,1]]

Output: [[0,0,0],[0,0,0],[0,0,0]]

Explanation:

For the points (0,0), (0,2), (2,0), (2,2): floor(3/4) = floor(0.75) = 0

For the points (0,1), (1,0), (1,2), (2,1): floor(5/6) = floor(0.83333333) = 0

For the point (1,1): floor(8/9) = floor(0.88888889) = 0

Example 2:

Input: img = [[100,200,100],[200,50,200],[100,200,100]]

Output: [[137,141,137],[141,138,141],[137,141,137]]

Explanation:

For the points (0,0), (0,2), (2,0), (2,2): floor((100+200+200+50)/4) = floor(137.5) = 137

For the points (0,1), (1,0), (1,2), (2,1): floor((200+200+50+200+100+100)/6) = floor(141.666667) = 141

For the point (1,1): floor((50+200+200+200+200+100+100+100+100)/9) = floor(138.888889) = 138

Constraints:

  • m == img.length
  • n == img[i].length
  • 1 <= m, n <= 200
  • 0 <= img[i][j] <= 255

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int[][]
    imageSmoother(int[][] matrix)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • imageSmoother

      public int[][] imageSmoother(int[][] matrix)