SmartJavaAI/smartjavaai-ocr/src/main/java/cn/smartjavaai/ocr/opencv/OcrNDArrayUtils.java

package cn.smartjavaai.ocr.opencv;

import ai.djl.ndarray.NDArray;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Point;

import java.util.ArrayList;
import java.util.List;
/**
 * NDArray Utils
 *
 */
public class OcrNDArrayUtils {
    /**
     * Mat To MatOfPoint
     * @param mat
     * @return
     */
    public static MatOfPoint matToMatOfPoint(Mat mat) {
        int rows = mat.rows();
        MatOfPoint matOfPoint = new MatOfPoint();

        List<Point> list = new ArrayList<>();
        for (int i = 0; i < rows; i++) {
            Point point = new Point((float) mat.get(i, 0)[0], (float) mat.get(i, 1)[0]);
            list.add(point);
        }
        matOfPoint.fromList(list);

        return matOfPoint;
    }

    /**
     * float NDArray To float[][] Array
     * @param ndArray
     * @return
     */
    public static float[][] floatNDArrayToArray(NDArray ndArray) {
        int rows = (int) (ndArray.getShape().get(0));
        int cols = (int) (ndArray.getShape().get(1));
        float[][] arr = new float[rows][cols];

        float[] arrs = ndArray.toFloatArray();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                arr[i][j] = arrs[i * cols + j];
            }
        }
        return arr;
    }

    /**
     * Mat To double[][] Array
     * @param mat
     * @return
     */
    public static double[][] matToDoubleArray(Mat mat) {
        int rows = mat.rows();
        int cols = mat.cols();

        double[][] doubles = new double[rows][cols];

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                doubles[i][j] = mat.get(i, j)[0];
            }
        }

        return doubles;
    }

    /**
     * Mat To float[][] Array
     * @param mat
     * @return
     */
    public static float[][] matToFloatArray(Mat mat) {
        int rows = mat.rows();
        int cols = mat.cols();

        float[][] floats = new float[rows][cols];

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                floats[i][j] = (float) mat.get(i, j)[0];
            }
        }

        return floats;
    }

    /**
     * Mat To byte[][] Array
     * @param mat
     * @return
     */
    public static byte[][] matToUint8Array(Mat mat) {
        int rows = mat.rows();
        int cols = mat.cols();

        byte[][] bytes = new byte[rows][cols];

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                bytes[i][j] = (byte) mat.get(i, j)[0];
            }
        }

        return bytes;
    }

    /**
     * float NDArray To float[][] Array
     * @param ndArray
     * @param cvType
     * @return
     */
    public static Mat floatNDArrayToMat(NDArray ndArray, int cvType) {
        int rows = (int) (ndArray.getShape().get(0));
        int cols = (int) (ndArray.getShape().get(1));
        Mat mat = new Mat(rows, cols, cvType);

        float[] arrs = ndArray.toFloatArray();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                mat.put(i, j, arrs[i * cols + j]);
            }
        }
        return mat;
    }

    /**
     * float NDArray To Mat
     * @param ndArray
     * @return
     */
    public static Mat floatNDArrayToMat(NDArray ndArray) {
        int rows = (int) (ndArray.getShape().get(0));
        int cols = (int) (ndArray.getShape().get(1));
        Mat mat = new Mat(rows, cols, CvType.CV_32F);

        float[] arrs = ndArray.toFloatArray();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                mat.put(i, j, arrs[i * cols + j]);
            }
        }

        return mat;

    }

    /**
     * uint8 NDArray To Mat
     * @param ndArray
     * @return
     */
    public static Mat uint8NDArrayToMat(NDArray ndArray) {
        int rows = (int) (ndArray.getShape().get(0));
        int cols = (int) (ndArray.getShape().get(1));
        Mat mat = new Mat(rows, cols, CvType.CV_8U);

        byte[] arrs = ndArray.toByteArray();

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                mat.put(i, j, arrs[i * cols + j]);
            }
        }
        return mat;
    }

    /**
     * float[][] Array To Mat
     * @param arr
     * @return
     */
    public static Mat floatArrayToMat(float[][] arr) {
        int rows = arr.length;
        int cols = arr[0].length;
        Mat mat = new Mat(rows, cols, CvType.CV_32F);

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                mat.put(i, j, arr[i][j]);
            }
        }

        return mat;
    }

    /**
     * byte[][] Array To Mat
     * @param arr
     * @return
     */
    public static Mat uint8ArrayToMat(byte[][] arr) {
        int rows = arr.length;
        int cols = arr[0].length;
        Mat mat = new Mat(rows, cols, CvType.CV_8U);

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                mat.put(i, j, arr[i][j]);
            }
        }

        return mat;
    }

    /**
     * List To Mat
     * @param points
     * @return
     */
    public static Mat toMat(List<ai.djl.modality.cv.output.Point> points) {
        Mat mat = new Mat(points.size(), 2, CvType.CV_32F);
        for (int i = 0; i < points.size(); i++) {
            ai.djl.modality.cv.output.Point point = points.get(i);
            mat.put(i, 0, (float) point.getX());
            mat.put(i, 1, (float) point.getY());
        }

        return mat;
    }
}