:satellite: OpenCV is a sample project that is read from the video source (Camera, File System, NVR, DVR etc.) and displays the processed image via the http protocol.

Java 100.00%

http-server image-processing java opencv video-streaming

opencv-live-video-stream-over-http's Introduction

Hi there, I'm Mesut 👋

I'm a software engineer working primarily with backend technologies. I have extensive experience in software development and architecture design, focusing on creating highly available, low latency, reliable, distributed, and secure software architectures. I specialize in solving complex problems efficiently and providing value through rapid development and the release of quality features.

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For more information about me, check out mesutpiskin.com.

opencv-live-video-stream-over-http's People

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kleysonr android36524 ahmerraza as-you-like ronaldponguillo simar1998 gkumarcoder hellonico doytsujin pradeepm1610 fatmanak tom131313 road-trip9 pradeepsimba allaasharif

opencv-live-video-stream-over-http's Issues

How to reduce the frame delay and increase the fps?

I noticed the frame delay was 3 sec .

how to increase the fps ?

How to use web cam with this project ?

I want to stream web cam with opencv over http.

I did not know to run this project.

I want to use webcam sarxos https://github.com/sarxos/webcam-capture library with this project.

So , how can I done it with this project?

Add a sample project.

How to run this project ?

Give a sample project.

How can I send string over http socket ?

I want to send the String contineously over http socket.

   ac  f=new ac();
  String string = f.getSt();

  byte[] byteArray = string.getBytes();

  os.write("HTTP/1.0 200 OK\n".getBytes());
  os.write(new String("Content-Length: " + byteArray.length + "\n").getBytes());
  os.write("Content-Type: text/html\n\n".getBytes());

  os.write(byteArray);

I want to get and send the the String over the socket contineously .

This project get and sent the webcam image over http socket contineously.

But, I want to get and send the the String over the socket contineously .

How can I do this ?

I asked this question because I did't know more about http stream in java.

and I can't understand the following codes

   stream.write(("HTTP/1.0 200 OK\r\n" +
            "Connection: close\r\n" +
            "Max-Age: 0\r\n" +
            "Expires: 0\r\n" +
            "Cache-Control: no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0\r\n" +
            "Pragma: no-cache\r\n" +
            "Content-Type: multipart/x-mixed-replace; " +
            "boundary=" + boundary + "\r\n" +
            "\r\n" +
            "--" + boundary + "\r\n").getBytes());

and this

outputStream.write(("Content-type: image/jpeg\r\n" +
                "Content-Length: " + imageBytes.length + "\r\n" +
                "\r\n").getBytes());

How to resize an image .

#2 (comment)

Afetr , I executed this code. But , size of the web cam view is same.

How to read from stream using OpenCV

I want the other way around - I want to read network stream. I have no clue how to read video directly from (any) input stream. Do you know how to do it?

Add JPEG Quality/Compression

@mesutpiskin (moved this issue from the wrong place and corrected it - major change to my thinking)
Thanks for this project. Well done! It's just what I needed for a simple server of a camera frame with an overlay of an OpenCV drawing.

I wanted to control the JPG quality so I gleaned a technique from StackOverflow answers concerning encoding Java Swing types. I had posted that yesterday in the wrong issue but I browsed through your code today and I see you encoded the Mat to JPG twice - once using OpenCV and once using Swing. That duplication is unnecessary and the OpenCV is much easier to add compression so here's my suggestion of removing the Swing JPG encoding and adding Quality to OpenCV JPG encoding. The method name Mat2bufferedImage isn't as precise anymore and should be changed.

Change this in run() pushImage(imag, 10); // example of low quality, high compression

   public void pushImage(Mat frame, int quality) throws IOException {
        if (frame == null)
            return;
        try {
            outputStream = socket.getOutputStream();

            byte[] imageBytes = Mat2bufferedImage(frame, quality);

            outputStream.write(("Content-type: image/jpeg\r\n" +
                    "Content-Length: " + imageBytes.length + "\r\n" +
                    "\r\n").getBytes());

            outputStream.write(imageBytes);

            outputStream.write(("\r\n--" + boundary + "\r\n").getBytes());

        } catch (Exception ex) {
            socket = serverSocket.accept();
            writeHeader(socket.getOutputStream(), boundary);
        }
    }
   
    public static byte[] Mat2bufferedImage(Mat image, int quality) throws IOException {

        // jpg quality; 0 high compression to 100 low compression

        MatOfByte bytemat = new MatOfByte();

        MatOfInt parameters = new MatOfInt(Imgcodecs.IMWRITE_JPEG_QUALITY, quality); // pair-wise; param1, value1, ...

        Imgcodecs.imencode(".jpg", image, bytemat, parameters);

        return bytemat.toArray();
    }

stream.write(("HTTP/1.0 200 OK\r\n" +
            "Connection: close\r\n" +
            "Max-Age: 0\r\n" +
            "Expires: 0\r\n" +
            "Cache-Control: no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0\r\n" +
            "Pragma: no-cache\r\n" +
            "Content-Type: multipart/x-mixed-replace; " +
            "boundary=" + boundary + "\r\n" +
            "\r\n" +
            "--" + boundary + "\r\n").getBytes());
    }

And this

https://github.com/mesutpiskin/opencv-live-video-stream-over-http/blob/master/src/main/java/HttpStreamServer.java#L59

Can you explain this?

How to add native library for linux ?

I added the opencv's native library for windows.

but, how can I add the opencv's native library for both linux 32 bit and 64 bit?

In opencv release page there is no downloading option for linux. Then , How can I add the native library ?

where to download the opencv's native library for linux ?

Help me!!!

mesutpiskin / opencv-live-video-stream-over-http Goto Github PK