Recovery image with DFT

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Hello, I need recovery absence part of image via DFT. Example: http://jre.cplire.ru/jre/jul16/4/text... But, I dont know how get 0 component of specter(simply Mat[]) and how keep N components of spector and image(From N components of spector) insert to original image.

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Controller {
    @FXML
    private ImageView originalImage;
    @FXML
    private ImageView transformedImage;
    @FXML
    private ImageView antitransformedImage;
    // a FXML button for performing the transformation
    @FXML
    private Button transformButton;
    // a FXML button for performing the antitransformation
    @FXML
    private Button antitransformButton;

    // the main stage
    private Stage stage;
    // the JavaFX file chooser
    private FileChooser fileChooser;
    // support variables
    private Mat image;
    private List<Mat> planes;
    // the final complex image
    private Mat complexImage;

    private Mat imR;
    private Mat imG;
    private Mat imB;
    private boolean checkChannels;
int i = 1;

    /**
     * Init the needed variables
     */
    protected void init() {
        this.fileChooser = new FileChooser();
        this.image = new Mat();
        this.imR = new Mat();
        this.imG = new Mat();
        this.imB = new Mat();
        this.checkChannels = false;
        this.planes = new ArrayList<>();
        this.complexImage = new Mat();
    }

    /**
     * Load an image from disk
     */
    @FXML
    protected void loadImage() throws InterruptedException {
        // show the open dialog window

        File file = this.fileChooser.showOpenDialog(this.stage);
        if (file != null) {
            // read the image in gray scale
            double r = 0;
            double g = 0;
            double b = 0;
            this.image = Imgcodecs.imread(file.getAbsolutePath());
            Imgproc.rectangle(this.image, new Point((this.image.cols() / 2 - 10), (this.image.rows() / 2 - 2)), new Point((this.image.cols() / 2) + 20, (this.image.rows() / 2 + 2)), new Scalar(0, 0, 0, 0), -1);
            this.checkChannels = image.channels() == 1 ? true : false;
            for (int i = 0; i < 150; i++) {
                for (int j = 0; j < 150; j++) {
                    if (this.image.get(i, j)[0] != 0 && this.image.get(i, j)[1] != 0 && this.image.get(i, j)[2] != 0) {
                        r += this.image.get(i, j)[0];
                        g += this.image.get(i, j)[1];
                        b += this.image.get(i, j)[2];
                    }
                }
            }
            r = r / (150 * 150);
            g = g / (150 * 150);
            b = b / (150 * 150);
            for (int i = 73; i < 78; i++) {
                for (int j = 65; j < 96; j++) {

                    image.put(i, j, r, g, b);

                }
            }
            //  this.image = Imgcodecs.imread(file.getAbsolutePath(), Imgcodecs.IMREAD_GRAYSCALE);
            // show the image
            this.updateImageView(originalImage, Utils.mat2Image(this.image));
            // set a fixed width
            this.originalImage.setFitWidth(250);
            // preserve image ratio
            this.originalImage.setPreserveRatio(true);
            // update the UI
            this.transformButton.setDisable(false);

            // empty the image planes and the image views if it is not the first
            // loaded image
            if (!this.planes.isEmpty()) {
                this.planes.clear();
                this.transformedImage.setImage(null);
                this ...