Apply a median filter to an image. **Example:** A 3x3 image with pixel values [[1,2,3],[4,5,6],[7,8,9]] and a kernel size of 3. **Constraints:** Kernel size must be odd and greater than 1.
Test Cases
Test Case 1
Input:
[[1,2,3],[4,5,6],[7,8,9]]Expected:
[[2,3,4],[4,5,6],[6,7,8]]Test Case 2
Input:
[[10,20,30],[40,50,60],[70,80,90]]Expected:
[[20,30,40],[40,50,60],[60,70,80]]+ 3 hidden test cases