我正在尝试使用我在Google Code中存档的一些代码来比较两个图像。当我尝试运行它时，我收到以下错误：
起初我正在传递PNG文件，我认为将文件更改为JPG可以解决问题但是在测试了这个理论后它没有用。
javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1301)
at mjs.textparser.VisualComparison.loadJPG(VisualComparison.java:82)
at mjs.textparser.VisualComparison.<init>(VisualComparison.java:21)
at mjs.textparser.App.compareScreenshots(App.java:89)
at mjs.textparser.App.VisionTest(App.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1301)
at mjs.textparser.VisualComparison.loadJPG(VisualComparison.java:82)
at mjs.textparser.VisualComparison.<init>(VisualComparison.java:22)
at mjs.textparser.App.compareScreenshots(App.java:89)
at mjs.textparser.App.VisionTest(App.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
以下是我正在使用的代码：
public static void compareScreenshots() throws IOException {
VisualComparison cti = new VisualComparison("C:/workspace/Screenshots/Contact Information Capital One Canada/baseline.jpg", "C:/workspace/Screenshots/Contact Information Capital One Canada/compare.jpg" );
cti.setParameters(10, 10);
cti.compare();
if (!cti.isIdentic()) {
System.out.println("no match");
VisualComparison.saveJPG(cti.getImageResult(), "C:/workspace/Screenshots/Contact Information Capital One Canada/diff.jpg");
} else {
System.out.println("match");
}
VisualComparison.Java：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class VisualComparison {
private static BufferedImage image1, image2, imageResult;
private static boolean isIdentic;
// a number of pieces along vertical and horizontal
private static int compareX, compareY;
// �tolerance� comparison parameter that allows to treat similar colors as the same
private static double sensitivity = 1.00;
public VisualComparison(String file1, String file2) throws IOException {
image1 = loadJPG(file1);
image2 = loadJPG(file2);
}
// set a number of pieces along vertical and horizontal
public void setParameters(int compareX, int compareY) {
VisualComparison.compareX = compareX;
VisualComparison.compareY = compareY;
}
// compare the two images in this object.
public void compare() {
// setup change display image
imageResult = new BufferedImage(image2.getWidth(null), image2.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = imageResult.createGraphics();
g2.drawImage(image2, null, null);
g2.setColor(Color.RED);
// assign size of each section
int blocksX = (int)(image1.getWidth()/compareX);
int blocksY = (int)(image1.getHeight()/compareY);
VisualComparison.isIdentic = true;
for (int y = 0; y < compareY; y++) {
for (int x = 0; x < compareX; x++) {
int result1 [][] = convertTo2D(image1.getSubimage(x*blocksX, y*blocksY, blocksX - 1, blocksY - 1));
int result2 [][] = convertTo2D(image2.getSubimage(x*blocksX, y*blocksY, blocksX - 1, blocksY - 1));
for (int i = 0; i < result1.length; i++) {
for (int j = 0; j < result1[0].length; j++) {
int diff = Math.abs(result1[i][j] - result2[i][j]);
if (diff/Math.abs(result1[i][j]) > sensitivity) {
// draw an indicator on the change image to show where change was detected.
g2.fillRect(x*blocksX, y*blocksY, blocksX - 1, blocksY - 1);
isIdentic = false;
}
}
}
}
}
}
public BufferedImage getImageResult() {
return imageResult;
}
// representation fragment's of the picture in a two-dimensional integer array
public int[][] convertTo2D(BufferedImage subimage) {
int width = subimage.getWidth();
int height = subimage.getHeight();
int[][] result = new int[height][width];
for (int row = 0; row < height; row++) {
for (int col = 0; col < width; col++) {
result[row][col] = subimage.getRGB(col, row);
}
}
return result;
}
// reading picture from disk
public static BufferedImage loadJPG(String filename) throws IOException {
BufferedImage img = null;
try {
img = ImageIO.read(new File(filename));
} catch (IOException e) {
e.printStackTrace();
}
return img;
}
// writing picture into disk
public static void saveJPG(BufferedImage bimg, String filename) {
try {
File outputfile = new File(filename);
ImageIO.write(bimg, "jpg", outputfile);
} catch(IOException e) {
e.printStackTrace();
}
}
public boolean isIdentic() {
return isIdentic;
}
}