docs: public void setInput( I input ) {
  		this.inputImage = input;
  
  		// reset the state flag so that everything need sto be computed
  		if( stale != null ) {
  			for( int i = 0; i < stale.length; i++) {
  				boolean a[] = stale[i];
  				for( int j = 0; j < a.length; j++ ) {
  					a[j] = true;
  				}
  			}
  		}
  	}