如何在RFT中比较两个图像文件？
如何在RFT中比较两个图像文件？
下面脚本截获屏幕图像并保存到文件中，然后比较两个图像文件：
public void testMain(Object[] args)
{
CaptureScreen.captureScreen("C://tmp1.jpg");
startApp("calc");
计算器window().activate();
CaptureScreen.captureScreen("C://tmp2.jpg");
boolean result = compareImages("C://tmp1.jpg","C://tmp2.jpg");
if(result)
{
System.out.println("The two image are same!");
}
else
{
System.out.println("The two image are different.");
doImageDiff("C://tmp1.jpg","C://tmp2.jpg","C://tmp3.jpg");
}
}
captureScreen的写法参考：
http://blog.csdn.net/Testing_is_believing/archive/2010/01/23/5247785.aspx
通过比较像素点的方式比较两个图像文件：
public static boolean compareImages(String expectedImage, String actualImage)
{
BufferedImage expected = null, actual = null;
try
{
FileInputStream in = new FileInputStream(expectedImage);
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
expected = decoder.decodeAsBufferedImage();
in.close();
in = new FileInputStream(actualImage);
decoder = JPEGCodec.createJPEGDecoder(in);
actual = decoder.decodeAsBufferedImage();
in.close();
}
catch (Exception e) {
System.out.println("Error in BitmapOps#compareImages: error reading images: " + e);
return false;
}
if (expected == null || actual == null)
return false;
if (expected.getHeight() != actual.getHeight() || expected.getWidth() != actual.getWidth())
return false;
for (int y = 0; y < expected.getHeight(); ++y)
{
for (int x = 0; x < expected.getWidth(); ++x)
{
if (expected.getRGB(x, y) != actual.getRGB(x, y))
return false;
}
}
return true;
}
分析出两个图像文件不相等的地方，把差异的地方高亮显示并保存到图像文件：
public static void doImageDiff(String expectedImage, String actualImage, String diffImage)
{
BufferedImage expected = null, actual = null;
try
{
FileInputStream in = new FileInputStream(expectedImage);
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
expected = decoder.decodeAsBufferedImage();
in.close();
in = new FileInputStream(actualImage);
decoder = JPEGCodec.createJPEGDecoder(in);
actual = decoder.decodeAsBufferedImage();
in.close();
}
catch (Exception e) {
System.out.println("Error in BitmapOps#doImageDiff: error reading images: " + e);
return;
}
try {
BufferedImage difference = new BufferedImage(expected.getWidth(), expected.getHeight(), expected.getType());
if (expected == null || actual == null)
{
System.out.println("Error in BitmapOps#doImageDiff: Expected image or actual image is null");
return;
}
if (expected.getHeight() != actual.getHeight() || expected.getWidth() != actual.getWidth())
{
System.out.println("Error in BitmapOps#doImageDiff: Images are not the same size");
return;
}
for (int y = 0; y < expected.getHeight(); ++y)
{
for (int x = 0; x < expected.getWidth(); ++x)
{
int rgb = expected.getRGB(x, y) - actual.getRGB(x, y);
difference.setRGB(x, y, rgb);
}
}
FileOutputStream out = new FileOutputStream(diffImage);
JPEGImageEncoder encoder =
JPEGCodec.createJPEGEncoder(out);
encoder.encode(difference);
out.flush();
out.close();
}
catch (Exception e) {
System.out.println("Error in BitmapOps#doImageDiff: error writing image: " + e);
}
}