这个解决方案对我有用。它突出了差异,并且在我尝试过的方法中具有最佳性能。 (假设:图像大小相同。此方法尚未使用透明胶片进行测试。)
比较 1600x860 PNG 图像 50 次的平均时间(在同一台机器上):
- JDK7 ~178 毫秒
- JDK8 ~139 毫秒
有人有更好/更快的解决方案吗?
public static BufferedImage getDifferenceImage(BufferedImage img1, BufferedImage img2) {
// convert images to pixel arrays...
final int w = img1.getWidth(),
h = img1.getHeight(),
highlight = Color.MAGENTA.getRGB();
final int[] p1 = img1.getRGB(0, 0, w, h, null, 0, w);
final int[] p2 = img2.getRGB(0, 0, w, h, null, 0, w);
// compare img1 to img2, pixel by pixel. If different, highlight img1's pixel...
for (int i = 0; i < p1.length; i++) {
if (p1[i] != p2[i]) {
p1[i] = highlight;
}
}
// save img1's pixels to a new BufferedImage, and return it...
// (May require TYPE_INT_ARGB)
final BufferedImage out = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
out.setRGB(0, 0, w, h, p1, 0, w);
return out;
}
Usage:
import javax.imageio.ImageIO;
import java.io.File;
ImageIO.write(
getDifferenceImage(
ImageIO.read(new File("a.png")),
ImageIO.read(new File("b.png"))),
"png",
new File("output.png"));
一些灵感...