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This article introduces the relevant knowledge of "how to achieve anti-threshold binarization in OpenCV". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Inverse threshold binarization

Inverse threshold binarization and threshold binarization are inverse operations each other. The implementation of this class in OpenCV depends on the threshold () function. The following is the declaration of the function:

Threshold (src, dst, thresh, maxval, type)

Interpretation of each parameter

Src

A Mat object that represents the source of this operation (the input image).

Mat

An object like Mat that represents the target (output) image.

Thresh

Represents the threshold T.

Maxval

Represents the maximum grayscale value, usually 255.

Type

An integer type variable that represents the type of threshold to use, and the inverse threshold binarization is Imgproc.THRESH_BINARY_INV.

The mathematical description is explained as follows:

For a given src (XQuery y), if its pixel value is greater than the threshold T (thresh), it returns 0, otherwise it is the maximum pixel value.

Then the pixel description of dst is as follows:

Java code (JavaFX Controller layer)

Public class Controller {@ FXML private Text fxText; @ FXML private ImageView imageView; @ FXML private Label resultLabel; @ FXML public void handleButtonEvent (ActionEvent actionEvent) throws IOException {Node source = (Node) actionEvent.getSource (); Window theStage = source.getScene () .getWindow (); FileChooser fileChooser = new FileChooser (); FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter ("PNG files (* .png)", "* .png") FileChooser.getExtensionFilters () .add (extFilter); fileChooser.getExtensionFilters () .add (new FileChooser.ExtensionFilter ("JPG Files (* .jpg)", "* .jpg")); File file = fileChooser.showOpenDialog (theStage); runInSubThread (file.getPath ()) } private void runInSubThread (String filePath) {new Thread (new Runnable () {@ Override public void run () {try {WritableImage writableImage = thresholdOfNonBinary (filePath)) Platform.runLater (new Runnable () {@ Override public void run () {imageView.setImage (writableImage);}});} catch (IOException e) {e.printStackTrace () }) .start ();} private WritableImage thresholdOfNonBinary (String filePath) throws IOException {System.loadLibrary (Core.NATIVE_LIBRARY_NAME); Mat src = Imgcodecs.imread (filePath); Mat dst = new Mat (); Imgproc.threshold (src, dst, 130,255, Imgproc.THRESH_BINARY_INV); MatOfByte matOfByte = new MatOfByte () Imgcodecs.imencode (".jpg", dst, matOfByte); byte [] bytes = matOfByte.toArray (); InputStream in = new ByteArrayInputStream (bytes); BufferedImage bufImage = ImageIO.read (in); WritableImage writableImage = SwingFXUtils.toFXImage (bufImage, null); return writableImage;}}

Operation diagram

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