001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.image; 018 019import java.awt.*; 020import java.awt.image.*; 021 022/** 023 * A filter which replcaes each pixel by the mimimum of itself and its eight neightbours. 024 */ 025public class MinimumFilter extends WholeImageFilter { 026 027 public MinimumFilter() { 028 } 029 030 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 031 int index = 0; 032 int[] outPixels = new int[width * height]; 033 034 for (int y = 0; y < height; y++) { 035 for (int x = 0; x < width; x++) { 036 int pixel = 0xffffffff; 037 for (int dy = -1; dy <= 1; dy++) { 038 int iy = y+dy; 039 int ioffset; 040 if (0 <= iy && iy < height) { 041 ioffset = iy*width; 042 for (int dx = -1; dx <= 1; dx++) { 043 int ix = x+dx; 044 if (0 <= ix && ix < width) { 045 pixel = PixelUtils.combinePixels(pixel, inPixels[ioffset+ix], PixelUtils.MIN); 046 } 047 } 048 } 049 } 050 outPixels[index++] = pixel; 051 } 052 } 053 return outPixels; 054 } 055 056 public String toString() { 057 return "Blur/Minimum"; 058 } 059 060} 061