import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
 
public class WatermarkRemover {
    public static void coverWatermark(String inputPath, String outputPath, Rectangle watermarkArea) throws Exception {
        // 讀取原始圖片
        BufferedImage originalImage = ImageIO.read(new File(inputPath));
        Graphics2D g = originalImage.createGraphics();
 
        // 設(shè)置覆蓋顏色（這里假設(shè)背景是白色）
        g.setColor(Color.WHITE);
        // 填充水印區(qū)域
        g.fillRect(watermarkArea.x, watermarkArea.y, watermarkArea.width, watermarkArea.height);
        g.dispose();
 
        // 保存處理后的圖片
        ImageIO.write(originalImage, "png", new File(outputPath));
    }
 
    public static void main(String[] args) throws Exception {
        // 假設(shè)水印在 (100, 100) 的位置，大小為 200x50
        Rectangle area = new Rectangle(100, 100, 200, 50);
        coverWatermark("input.jpg", "output_covered.png", area);
    }
}

public static void removeColorWatermark(String inputPath, String outputPath, Color watermarkColor, int tolerance) throws Exception {
    BufferedImage image = ImageIO.read(new File(inputPath));
    int width = image.getWidth();
    int height = image.getHeight();
 
    // 水印顏色的RGB分量
    int wmRed = watermarkColor.getRed();
    int wmGreen = watermarkColor.getGreen();
    int wmBlue = watermarkColor.getBlue();
 
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            int pixel = image.getRGB(x, y);
            Color color = new Color(pixel, true);
 
            int red = color.getRed();
            int green = color.getGreen();
            int blue = color.getBlue();
 
            // 計(jì)算當(dāng)前顏色與水印顏色的歐幾里得距離（簡(jiǎn)化版）
            double distance = Math.sqrt(
                Math.pow(red - wmRed, 2) +
                Math.pow(green - wmGreen, 2) +
                Math.pow(blue - wmBlue, 2)
            );
 
            // 如果顏色足夠接近水印色，則用周圍像素的平均值替換（這里簡(jiǎn)化了，直接用白色）
            if (distance < tolerance) {
                // 更高級(jí)的做法是取周圍非水印像素的平均值
                image.setRGB(x, y, Color.WHITE.getRGB());
            }
        }
    }
    ImageIO.write(image, "png", new File(outputPath));
}

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.photo.Photo;
 
public class OpenCVWatermarkRemoval {
    public static void main(String[] args) {
        // 加載 OpenCV 本地庫(kù)
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
 
        // 1. 讀取原始圖像
        Mat src = Imgcodecs.imread("input.jpg");
        // 2. 讀取掩膜圖像（必須是8位單通道灰度圖）
        //    掩膜圖中：水印區(qū)域?yàn)榘咨?55），其他區(qū)域?yàn)楹谏?）
        Mat mask = Imgcodecs.imread("watermark_mask.png", Imgcodecs.IMREAD_GRAYSCALE);
 
        // 3. 創(chuàng)建用于存儲(chǔ)結(jié)果的Mat
        Mat dst = new Mat();
 
        // 4. 進(jìn)行圖像修復(fù)
        Photo.inpaint(src, mask, dst, 3, Photo.INPAINT_TELEA);
 
        // 5. 保存結(jié)果
        Imgcodecs.imwrite("output_inpainted.jpg", dst);
    }
}