-
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathError_Level_Analysis.java
More file actions
205 lines (168 loc) · 8.54 KB
/
Copy pathError_Level_Analysis.java
File metadata and controls
205 lines (168 loc) · 8.54 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
import ij.IJ;
import ij.ImagePlus;
import ij.gui.GenericDialog;
import ij.gui.NewImage;
import ij.io.SaveDialog;
import ij.plugin.filter.PlugInFilter;
import ij.process.Blitter;
import ij.process.ImageProcessor;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.stream.MemoryCacheImageOutputStream;
import utility.HtmlReport;
/**
* @author Sebastiano Milardo
*/
public class Error_Level_Analysis implements PlugInFilter {
ImagePlus imp;
HtmlReport report;
@Override
public int setup(String arg, ImagePlus imp) {
if (arg.equals("about")) {
showAbout();
return DONE;
}
this.imp = imp;
return DOES_ALL+NO_CHANGES;
}
@Override
public void run(ImageProcessor ip) {
String path = imp.getOriginalFileInfo().directory;
String directory = path;
String nomeFile = imp.getTitle();
path += nomeFile;
GenericDialog dialog = new GenericDialog("Parameters");
dialog.addSlider("Quality", 0, 100, 88);
dialog.addSlider("Scale", 0, 50, 10);
dialog.addCheckbox("Generate Report", false);
dialog.showDialog();
if (dialog.wasCanceled()) {
IJ.error("PlugIn canceled!");
return;
}
int quality = (int)dialog.getNextNumber();
int scale = (int)dialog.getNextNumber();
boolean report = dialog.getNextBoolean();
ImagePlus image = calcErrorLevel(ip,quality,scale);
image.show();
image.updateAndDraw();
if (report){// genera il report
SaveDialog sdOriginal = new SaveDialog("Save Original Image ...", nomeFile,".jpg");
String pathOriginal = sdOriginal.getDirectory();
String fileNameOriginal = sdOriginal.getFileName();
if (fileNameOriginal==null) return;
IJ.save(imp, pathOriginal+fileNameOriginal);
SaveDialog sdELA = new SaveDialog("Save Error Level Analysis Image ...", "ErrorLevelAnalysis",".jpg");
String pathELA = sdELA.getDirectory();
String fileNameELA = sdELA.getFileName();
if (fileNameELA==null) return;
IJ.save(image, pathELA+fileNameELA);
createReport(quality, scale, pathOriginal+fileNameOriginal,pathELA+fileNameELA);
}
}
void showAbout() {
IJ.showMessage("About Error_Level_Analysis...",
"Image error level analysis is a technique\n"+
"that can help to identify manipulations to\n"+
"compressed (JPEG) images by detecting the \n"+
"distribution of error introduced after \n"+
"resaving the image at a specific compression\n"+
" rate."
);
}
private ImagePlus calcErrorLevel(ImageProcessor ip,int level, int scale){
int w = ip.getWidth();
int h = ip.getHeight();
ImagePlus ImageOriginal = NewImage.createRGBImage("Error Level Analisys", w, h,1, NewImage.FILL_BLACK);
ImageProcessor original_ip = ImageOriginal.getProcessor();
original_ip.copyBits(ip,0,0,Blitter.COPY);
ImagePlus ImageReduced = saveAsJpeg(imp,level);
ImageProcessor reduced_ip = ImageReduced.getProcessor();
int[] pixelsOriginal = (int[]) original_ip.getPixels();
int[] pixelsReduced = (int[]) reduced_ip.getPixels();
for(int i = 0, l = pixelsOriginal.length; i < l; i++) {
int cReduced = pixelsReduced[i];
int rReduced = (cReduced & 0xff0000)>>16;
int gReduced = (cReduced & 0x00ff00)>>8;
int bReduced = (cReduced & 0x0000ff);
int cOriginal = pixelsOriginal[i];
int rOriginal = (cOriginal & 0xff0000)>>16;
int gOriginal = (cOriginal & 0x00ff00)>>8;
int bOriginal = (cOriginal & 0x0000ff);
rReduced=Math.abs(rReduced-rOriginal);
gReduced=Math.abs(gReduced-gOriginal);
bReduced=Math.abs(bReduced-bOriginal);
pixelsReduced[i] = ((rReduced & 0xff) << 16) + ((gReduced & 0xff) << 8) +(bReduced & 0xff);
pixelsReduced[i] = pixelsReduced[i]*scale;
}
return ImageReduced;
}
private ImagePlus saveAsJpeg(ImagePlus imp, int quality) {
ImagePlus imageScaled = null;
int width = imp.getWidth();
int height = imp.getHeight();
int biType = BufferedImage.TYPE_INT_RGB;
boolean overlay = imp.getOverlay()!=null && !imp.getHideOverlay();
if (imp.getProcessor().isDefaultLut() && !imp.isComposite() && !overlay)
biType = BufferedImage.TYPE_BYTE_GRAY;
BufferedImage bi = new BufferedImage(width, height, biType);
String error = null;
try {
Graphics g = bi.createGraphics();
Image img = imp.getImage();
if (overlay)
img = imp.flatten().getImage();
g.drawImage(img, 0, 0, null);
g.dispose();
Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
ImageWriter writer = (ImageWriter)iter.next();
ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
ImageOutputStream ios = new MemoryCacheImageOutputStream(byteArray);
writer.setOutput(ios);
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(quality/100f);
if (quality == 100)
param.setSourceSubsampling(1, 1, 0, 0);
IIOImage iioImage = new IIOImage(bi, null, null);
writer.write(null, iioImage, param);
ios.close();
writer.dispose();
imageScaled = new ImagePlus("Error Level Analysis", ImageIO.read(new ByteArrayInputStream(byteArray.toByteArray())));
} catch (Exception e) {
error = ""+e;
IJ.error("Jpeg Writer", ""+error);
}
return imageScaled;
}
private void createReport(int quality, int scale, String path1, String path2){
try {
report = new HtmlReport(path1);
report.setOperation("Error Level Analysis Plugin");
report.setSummary("Calcola dell'Error Level Analysis");
report.setDetails("\"Error Level Analysis\" genera un'analisi dell'immagine alla ricerca "
+ "di aree modificate artificialmente, sfruttando la compressione del formato JPEG.");
report.addParameter("Qualita'", "Qualita' per l'immagine JPEG risalvata.", quality+"");
report.addParameter("Scala", "Scala usata per amplificare le differenze tra immagine originale e risalvata.", scale+"");
report.addParameter("Percorso Immagine Originale", "", path1);
report.addParameter("HASH MD5", "Hash MD5 dell'immagine originale.", HtmlReport.hash(path1, "MD5"));
report.addParameter("HASH SHA-1", "Hash SHA-1 dell'immagine originale.", HtmlReport.hash(path1, "SHA-1"));
report.addParameter("Percorso Immagine Error Level Analysis", "", path2);
report.addParameter("HASH MD5", "Hash MD5 dell'Error Level Analysis.", HtmlReport.hash(path2, "MD5"));
report.addParameter("HASH SHA-1", "Hash SHA-1 dell'Error Level Analysis.", HtmlReport.hash(path2, "SHA-1"));
report.addReference("Neal Krawetz, A Picture's Worth - Digital Image Analysis and Forensics, Black Hat Briefings, USA 2007.");
report.generateReport("Report_ELA.html");
} catch (Exception ex) {
IJ.showMessage(ex.getMessage());
}
}
}