001 /* 002 * 003 004 Licensed under the Apache License, Version 2.0 (the "License"); 005 you may not use this file except in compliance with the License. 006 You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010 Unless required by applicable law or agreed to in writing, software 011 distributed under the License is distributed on an "AS IS" BASIS, 012 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 See the License for the specific language governing permissions and 014 limitations under the License. 015 */ 016 017 package railo.runtime.img.filter;import java.awt.Rectangle; 018 import java.awt.image.BufferedImage; 019 020 import railo.runtime.engine.ThreadLocalPageContext; 021 import railo.runtime.exp.FunctionException; 022 import railo.runtime.exp.PageException; 023 import railo.runtime.img.ImageUtil; 024 import railo.runtime.type.List; 025 import railo.runtime.type.Struct; 026 027 /** 028 * A filter which performs a 3x3 median operation. Useful for removing dust and noise. 029 */ 030 public class MedianFilter extends WholeImageFilter implements DynFiltering { 031 032 public MedianFilter() { 033 } 034 035 private int median(int[] array) { 036 int max, maxIndex; 037 038 for (int i = 0; i < 4; i++) { 039 max = 0; 040 maxIndex = 0; 041 for (int j = 0; j < 9; j++) { 042 if (array[j] > max) { 043 max = array[j]; 044 maxIndex = j; 045 } 046 } 047 array[maxIndex] = 0; 048 } 049 max = 0; 050 for (int i = 0; i < 9; i++) { 051 if (array[i] > max) 052 max = array[i]; 053 } 054 return max; 055 } 056 057 private int rgbMedian(int[] r, int[] g, int[] b) { 058 int sum, index = 0, min = Integer.MAX_VALUE; 059 060 for (int i = 0; i < 9; i++) { 061 sum = 0; 062 for (int j = 0; j < 9; j++) { 063 sum += Math.abs(r[i]-r[j]); 064 sum += Math.abs(g[i]-g[j]); 065 sum += Math.abs(b[i]-b[j]); 066 } 067 if (sum < min) { 068 min = sum; 069 index = i; 070 } 071 } 072 return index; 073 } 074 075 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 076 int index = 0; 077 int[] argb = new int[9]; 078 int[] r = new int[9]; 079 int[] g = new int[9]; 080 int[] b = new int[9]; 081 int[] outPixels = new int[width * height]; 082 083 for (int y = 0; y < height; y++) { 084 for (int x = 0; x < width; x++) { 085 int k = 0; 086 for (int dy = -1; dy <= 1; dy++) { 087 int iy = y+dy; 088 if (0 <= iy && iy < height) { 089 int ioffset = iy*width; 090 for (int dx = -1; dx <= 1; dx++) { 091 int ix = x+dx; 092 if (0 <= ix && ix < width) { 093 int rgb = inPixels[ioffset+ix]; 094 argb[k] = rgb; 095 r[k] = (rgb >> 16) & 0xff; 096 g[k] = (rgb >> 8) & 0xff; 097 b[k] = rgb & 0xff; 098 k++; 099 } 100 } 101 } 102 } 103 while (k < 9) { 104 argb[k] = 0xff000000; 105 r[k] = g[k] = b[k] = 0; 106 k++; 107 } 108 outPixels[index++] = argb[rgbMedian(r, g, b)]; 109 } 110 } 111 return outPixels; 112 } 113 114 public String toString() { 115 return "Blur/Median"; 116 } 117 118 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 119 Object o; 120 121 // check for arguments not supported 122 if(parameters.size()>0) { 123 throw new FunctionException(ThreadLocalPageContext.get(), "ImageFilter", 3, "parameters", "the parameter"+(parameters.size()>1?"s":"")+" ["+List.arrayToList(parameters.keysAsString(),", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported []"); 124 } 125 126 return filter(src, dst); 127 } 128 } 129