剪切文本形状的图像

image java image-processing

2022-09-01 00:01:57

我需要在另一个图像中剪切出文本形状的图像。我认为它最好用图像来显示。

这是一张猫的照片：

Photo of a nice cat

这是我想删掉的文字：

Text to cut out of the cat photo

生成的图像将是这样的：

Resulting cut-out of the cat photo

文本图像将始终为具有透明背景的黑色，并且生成的剪切图也应具有透明背景。两个输入图像也将具有相同的大小。

答案 1

Cat text

import java.awt.*;
import java.awt.font.*;
import java.awt.image.BufferedImage;
import java.awt.geom.Rectangle2D;
import javax.imageio.ImageIO;
import java.net.URL;
import java.io.File;

class PictureText {

    public static void main(String[] args) throws Exception {
        URL url = new URL("http://i.stack.imgur.com/Nqf3H.jpg");
        BufferedImage originalImage = ImageIO.read(url);
        final BufferedImage textImage = new BufferedImage(
            originalImage.getWidth(),
            originalImage.getHeight(),
            BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = textImage.createGraphics();
        FontRenderContext frc = g.getFontRenderContext();
        Font font = new Font(Font.SANS_SERIF, Font.BOLD, 250);
        GlyphVector gv = font.createGlyphVector(frc, "Cat");
        Rectangle2D box = gv.getVisualBounds();
        int xOff = 25+(int)-box.getX();
        int yOff = 80+(int)-box.getY();
        Shape shape = gv.getOutline(xOff,yOff);
        g.setClip(shape);
        g.drawImage(originalImage,0,0,null);
        g.setClip(null);
        g.setStroke(new BasicStroke(2f));
        g.setColor(Color.BLACK);
        g.setRenderingHint(
            RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        g.draw(shape);

        g.dispose();

        File file = new File("cat-text.png");
        ImageIO.write(textImage,"png",file);
        Desktop.getDesktop().open(file);
    }
}

答案 2

创建一个新的 BufferedImage 并循环访问 word cat 的所有像素，如果它们是黑色的，则将 cat 图像像素复制到新图像中。

下面是一些代码：（最终工作代码，支持抗锯齿)

public static BufferedImage textEffect(BufferedImage image, BufferedImage text) {
    if (image.getWidth() != text.getWidth() ||
        image.getHeight() != text.getHeight())
    {
        throw new IllegalArgumentException("Dimensions are not the same!");
    }
    BufferedImage img = new BufferedImage(image.getWidth(),
                                          image.getHeight(),
                                          BufferedImage.TYPE_INT_ARGB_PRE);

    for (int y = 0; y < image.getHeight(); ++y) {
        for (int x = 0; x < image.getWidth(); ++x) {
           int textPixel = text.getRGB(x, y);
           int textAlpha = (textPixel & 0xFF000000);
           int sourceRGB = image.getRGB(x, y);
           int newAlpha = (int) (((textAlpha >> 24) * (sourceRGB >> 24)) / 255d);
           int imgPixel = (newAlpha << 24) |  (sourceRGB & 0x00FFFFFF);
           int rgb = imgPixel | textAlpha;
           img.setRGB(x, y, rgb);

        }
    }
    return img;
}