Mat to Byte []转换不能在java中工作

Question

我试图在Mat中将Mat转换为字节数组.在将Mat转换为Byte []和Byte []转换为Mat时,我无法保留Mat的原始值.Mat .get接受byte []作为不起作用的参数.任何人都可以帮助我吗？

使用案例:要获取每个视频帧并通过kafka将其发送到包含byte []消息的消费者,然后消费者将收到字节数组并转换为Mat并将其保存为图像.

我在java中遇到了类似的帖子,但没有找到解决方案.这里

看我的代码:

`       System.loadLibrary("opencv_java249");
        MatOfByte webcam_image = new MatOfByte();
        VideoCapture capture = new VideoCapture(
                "/home/jishnu/CodeT/TrainingDataSet/Video.mp4");
        System.out.println("Frame Grabber started");
        byte[] frameArray;
        int i=0;
        if (capture.isOpened()) {
            while (true) {
                capture.read(webcam_image);
                frameArray = new byte[(int) (webcam_image.total() * webcam_image
                    .channels())];
            if (!webcam_image.empty()) {                    
            //  System.out.print(".");  
                webcam_image.get(0,0,frameArray);

                producer.send(new KeyedMessage<String, byte[]>("imageTopic",frameArray));

                //Below statements are only for debugging
                System.out.println(frameArray.length);      
                MatOfByte inputframe=new MatOfByte(frameArray);
                boolean b=  Highgui.imwrite("/home/jishnu/CodeT/Today7.jpeg", inputframe);

                if(b){System.out.println("save image success");}
                else System.out.println("save image failed");

                inputframe.fromArray(frameArray);
                b=  Highgui.imwrite("/home/jishnu/CodeT/Today6.bmp",inputframe);

                if(b){System.out.println("save image success");System.exit(0);}
                else System.out.println("save image failed");

            } else {
                System.out.println(" --(!) No captured frame -- Break!");

`

Answer 1

这对我有用.我使用apachi-common进行写入和从文件中读取.

public static void save(Mat mat, String name)
        {
            File file = new File(path, name);
            int length = (int) (mat.total() * mat.elemSize());
            byte buffer[] = new byte[length];
            mat.get(0, 0, buffer);
            try
                {
                    FileUtils.writeByteArrayToFile(file, buffer);
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
        }

 public static Mat load(String name)
        {
            File file = new File(path, name);
            byte[] buffer = new byte[0];
            try
                {
                    buffer = FileUtils.readFileToByteArray(file);
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
            Mat mat = new Mat(row, col, type);
            mat.put(0, 0, buffer);
            return mat;
        }