Mat与BufferedImage相互转换

最新推荐文章于 2025-05-23 10:25:41 发布

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最新推荐文章于 2025-05-23 10:25:41 发布

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分类专栏： opencv

本文链接：https://blog.youkuaiyun.com/zwl18210851801/article/details/81279725

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本文提供了两个实用的方法：将OpenCV的Mat对象转换为Java的BufferedImage对象，以及相反的转换过程。这两种转换方法适用于图像处理任务中不同库之间的数据交换。

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Mat与BufferedImage相互转换：

 /**
     * Mat转换成BufferedImage
     *
     * @param matrix
     *            要转换的Mat
     * @param fileExtension
     *            格式为 ".jpg", ".png", etc
     * @return
     */
    public static BufferedImage Mat2BufImg (Mat matrix, String fileExtension) {
        // convert the matrix into a matrix of bytes appropriate for
        // this file extension
        MatOfByte mob = new MatOfByte();
        Imgcodecs.imencode(fileExtension, matrix, mob);
        // convert the "matrix of bytes" into a byte array
        byte[] byteArray = mob.toArray();
        BufferedImage bufImage = null;
        try {
            InputStream in = new ByteArrayInputStream(byteArray);
            bufImage = ImageIO.read(in);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bufImage;
    }

    /**
     * BufferedImage转换成Mat
     *
     * @param original
     *            要转换的BufferedImage
     * @param imgType
     *            bufferedImage的类型 如 BufferedImage.TYPE_3BYTE_BGR
     * @param matType
     *            转换成mat的type 如 CvType.CV_8UC3
     */
    public static Mat BufImg2Mat (BufferedImage original, int imgType, int matType) {
        if (original == null) {
            throw new IllegalArgumentException("original == null");
        }

        // Don't convert if it already has correct type
        if (original.getType() != imgType) {

            // Create a buffered image
            BufferedImage image = new BufferedImage(original.getWidth(), original.getHeight(), imgType);

            // Draw the image onto the new buffer
            Graphics2D g = image.createGraphics();
            try {
                g.setComposite(AlphaComposite.Src);
                g.drawImage(original, 0, 0, null);
            } finally {
                g.dispose();
            }
        }
        DataBufferByte dbi =(DataBufferByte)original.getRaster().getDataBuffer();
        byte[] pixels = dbi.getData();
        Mat mat = Mat.eye(original.getHeight(), original.getWidth(), matType);
        mat.put(0, 0, pixels);
        return mat;
    }