Pengaturcaraan Java untuk merealisasikan pengimbasan dan pengecaman jawapan kepada soalan ujian dalam sistem peperiksaan dalam talian

import org.opencv.core.*;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Rect;
import org.opencv.core.Point;
import org.opencv.core.MatOfByte;

public class ImagePreprocessing {
    public static void main(String[] args) {
        // Load image
        Mat image = Imgcodecs.imread("answer_sheet.jpg");

        // Convert to gray scale
        Mat grayImage = new Mat();
        Imgproc.cvtColor(image, grayImage, Imgproc.COLOR_BGR2GRAY);

        // Apply thresholding
        Mat binaryImage = new Mat();
        Imgproc.threshold(grayImage, binaryImage, 127, 255, Imgproc.THRESH_BINARY);

        // Save processed image
        Imgcodecs.imwrite("processed_image.jpg", binaryImage);
    }
}

public class AnswerBoxDetection {
    public static void main(String[] args) {
        // Load processed image
        Mat binaryImage = Imgcodecs.imread("processed_image.jpg", Imgcodecs.CV_LOAD_IMAGE_GRAYSCALE);

        // Apply contour detection
        List<MatOfPoint> contours = new ArrayList<>();
        Mat hierarchy = new Mat();
        Imgproc.findContours(binaryImage, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);

        // Filter out valid answer box contours
        List<Rect> answerBoxes = new ArrayList<>();
        for (MatOfPoint contour : contours) {
            double area = Imgproc.contourArea(contour);
            if (area > 1000) { // Adjust parameter to filter out small contours
                Rect boundingRect = Imgproc.boundingRect(contour);
                answerBoxes.add(boundingRect);
            }
        }

        // Save the coordinates of answer boxes
        for (int i = 0; i < answerBoxes.size(); i++) {
            Rect boundingRect = answerBoxes.get(i);
            System.out.println("Answer box " + (i + 1) + " coordinates: (" + boundingRect.x
                    + ", " + boundingRect.y + ", " + (boundingRect.x + boundingRect.width)
                    + ", " + (boundingRect.y + boundingRect.height) + ")");
        }
    }
}

import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;

public class AnswerRecognition {
    public static void main(String[] args) {
        // Load answer box image
        Mat answerBoxImage = Imgcodecs.imread("answer_box.jpg", Imgcodecs.CV_LOAD_IMAGE_GRAYSCALE);

        // Apply OCR
        Tesseract tesseract = new Tesseract();
        tesseract.setDatapath("tessdata"); // Set path to Tesseract training data
        try {
            String answer = tesseract.doOCR(answerBoxImage);
            System.out.println("Recognized answer: " + answer);
        } catch (TesseractException e) {
            System.err.println(e.getMessage());
        }
    }
}