i want to read image captured by webcam videocapture and write that to some external file

asked 2017-02-22 11:09:43 -0600

Rifat
6 ●1 ●3

updated 2017-02-22 11:52:20 -0600

berak
32993 ●7 ●81 ●312

I am working on a project where my first step is to detect faces by webcam and the 2nd step is to save those images into some file .i am using opencv programs for facedetection.

imagetoshow contains the image of face detected by the webcam.The code line for this is as:

Image imageToShow = grabFrame();

i did first step but i am getting problem in second step Code snippet to read the image that i am using is below:

  try{
       f = new File("imageToShow"); //image file path
       image = new BufferedImage(width, height,
       BufferedImage.TYPE_INT_ARGB);
       image = ImageIO.read(f);
       System.out.println("Reading complete.");
 }catch(IOException e){
       System.out.println("Error: "+e);
 }

It seems that it is not reading anything from the file specified .Am i doing it in the right way?

Comments

can you try again, and use the 10101 button, to format your code, not the " one ?

berak ( 2017-02-22 11:14:13 -0600 )edit

it's getting better, keep on trying ;)

berak ( 2017-02-22 11:35:40 -0600 )edit

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answered 2017-02-22 11:33:48 -0600

berak
32993 ●7 ●81 ●312

you should use opencv functions, to save / load your image:

// write:
int counter = 0;
VideoCapture cap = new VideoCapture(0);
while(cap.isOpened()) {
     Mat frame = new Mat();
     if (cap.read(frame)) {
         Imgcodecs.write( "my."+counter+".png", frame); // Highgui, for outdated opencv2.4
         counter++;    
     }
}

// read:
Mat img = Imgcodecs.imread("my.17.png");

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Comments

thankyou so much for your help.

Rifat ( 2017-02-22 11:37:22 -0600 )edit

when i executed it separately ,it worked well. But i want to include it in a program where face is detected and saved as an object of Image class. The code is below:

Runnable frameGrabber = new Runnable()
                {

                @Override
                public void run()
                   {
                    Image imageToShow = grabFrame();
                    //System.out.println("inside runnable");
                        Platform.runLater(() -> {
                                try{
                                        originalFrame.setImage(imageToShow);
                                    }
                                catch(Exception ex)
                                        {

                                            System.out.println(ex);
                                        }
                                });
                          Imgcodecs.imwrite( "my"+".png",imageToShow );

                   }
                };

it gives the error message "The method imwrite(String, Mat) in the type Imgcodecs is not applicable for the arguments (String, Image)"

Rifat ( 2017-02-24 08:03:10 -0600 )edit

what is the way to do it.?

Rifat ( 2017-02-24 08:05:36 -0600 )edit

what is Image ?

berak ( 2017-02-24 09:04:39 -0600 )edit

it is a class which is imported by the program

import javafx.scene.image.Image;

Rifat ( 2017-02-24 09:33:41 -0600 )edit

i downloaded it from the link [(http://github.com/opencv-java/face-detection/tree/master/src/it/polito/teaching/cv)]

Rifat ( 2017-02-24 09:40:54 -0600 )edit

oh, that link was useful !

so, - you have to use Mat for the camera and detection things (also for imwrite() !), then later convert it to Image using mat2Image to display it with javafx.

maybe here is a good place to insert the imwrite()

berak ( 2017-02-24 09:53:28 -0600 )edit

Thanks a lot .You made it so simple.

Rifat ( 2017-02-28 09:35:27 -0600 )edit

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i want to read image captured by webcam videocapture and write that to some external file

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