Langkah dan teknik utama untuk mengenal pasti ketulenan meterai kontrak rasmi menggunakan Java

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.highgui.VideoCapture;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.core.CvType;

public class ContractImageCapture {
    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        // 打开摄像头
        VideoCapture capture = new VideoCapture(0);
        if (!capture.isOpened()) {
            System.out.println("无法打开摄像头");
            return;
        }

        Mat mat = new Mat();
        capture.read(mat);

        // 保存图像
        Imgcodecs.imwrite("contract.jpg", mat);

        // 释放摄像头
        capture.release();

        System.out.println("合同图像采集成功");
    }
}

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.core.CvType;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.imgproc.Imgproc;

public class SealExtraction {
    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        String inputImagePath = "contract.jpg";

        // 加载合同图像
        Mat image = Imgcodecs.imread(inputImagePath);

        // 灰度化
        Mat gray = new Mat();
        Imgproc.cvtColor(image, gray, Imgproc.COLOR_BGR2GRAY);

        // 二值化
        Mat binary = new Mat();
        Imgproc.threshold(gray, binary, 0, 255, Imgproc.THRESH_BINARY | Imgproc.THRESH_OTSU);

        // 降噪
        Mat denoised = new Mat();
        Imgproc.medianBlur(binary, denoised, 5);

        // 提取公章
        // TODO: 公章识别算法实现

        // 保存公章图像
        String outputImagePath = "seal.jpg";
        Imgcodecs.imwrite(outputImagePath, seal);

        System.out.println("公章提取成功");
    }
}

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.highgui.VideoCapture;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.core.CvType;
import org.opencv.imgproc.Imgproc;

public class SealForgeryDetection {
    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        String originalSealPath = "original_seal.jpg";
        String forgedSealPath = "forged_seal.jpg";

        // 加载原始公章图像
        Mat originalSeal = Imgcodecs.imread(originalSealPath);
        // 加载篡改后的公章图像
        Mat forgedSeal = Imgcodecs.imread(forgedSealPath);

        // 计算图像相似度
        double similarity = calculateSimilarity(originalSeal, forgedSeal);
        double threshold = 0.9; // 设定相似度的阈值

        if (similarity >= threshold) {
            System.out.println("公章真品");
        } else {
            System.out.println("公章伪品");
        }
    }

    private static double calculateSimilarity(Mat image1, Mat image2) {
        // TODO: 图像相似度计算算法实现
        return 0.0;
    }
}