Text this: Further properties and a fast realization of the iterative truncated arithmetic mean filter

 ______      ___      ______   __   __    _____   
|      \\   / _ \\   /_   _//  \ \\/ //  |__  //  
|  --  //  | / \ ||    | ||     \ ` //     / //   
|  --  \\  | \_/ ||   _| ||      | ||     / //__  
|______//   \___//   /__//       |_||    /_____|| 
`------`    `---`    `--`        `-`'    `-----`