Object Oriented Programming Articles - Page 253 of 579

The distance transform, in general, is a derived representation of a digital image. In this operation, the gray level intensities of the points inside the foreground regions are changed to distance their respective distances from the closest 0 value (boundary).The distanceTransform() method of the Imgproc class applies Distance Transform on the given image, this method accepts −Two Mat objects representing the source and destination images.An integer variable representing the type of the distance transformation to be applied.An integer value representing the mask size to be used.Exampleimport java.awt.Image; import java.awt.image.BufferedImage; import java.io.IOException; import javafx.application.Application; import javafx.embed.swing.SwingFXUtils; import javafx.scene.Group; import javafx.scene.Scene; import ... Read More

The Laplacian transform on an image highlights the regions where there is a rapid intensity change. Therefore, it is used to detect edges.The Laplacian() method of the Imgproc class applies Laplacian Transform on the given image, this method accepts −Two Mat objects representing the source and destination images.Four integer variables representing the depth, size, scale and, delta values of the transform.An integer value representing the border.Exampleimport java.awt.Image; import java.awt.image.BufferedImage; import java.io.IOException; import javafx.application.Application; import javafx.embed.swing.SwingFXUtils; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.image.ImageView; import javafx.scene.image.WritableImage; import javafx.stage.Stage; import org.opencv.core.Core; import org.opencv.core.CvType; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class LaplacianTransform ... Read More

You can detect circles in a given image using the Hough circle transform. You can apply Hough Circle transform using the HoughCircles() method, this method accept the following parameters −A Mat object representing the input image.A Mat object to store the output vectors of the found circles.An integers variables representing the detection method.Two double variables representing an inverse ratio of the accumulator resolution to the image resolution and minimum distance between the centers of the detected circles.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.IOException; import javafx.application.Application; import javafx.embed.swing.SwingFXUtils; ... Read More

Morphological operations are the set of operations that process images according to the given shapes.Erosion − Erosion is a morphological operation during which pixels are removed from the image boundaries.Dilation − During is a morphological operation during which pixels are added to the image boundaries.Where the total number of pixels added/removed depends on the dimensions of the structuring element used.Morphological Opening − During this operation erosion is applied on the given input and on the result dilation is applied. This is used to remove small objects from the foreground of an image.Morphological Closing − During this operation dilation is applied ... Read More

The HighGui class of the org.opencv.highgui package allows you to create and manipulate windows and display them. You can display an image in a window using the imshow() method of this class. This method accepts two parameters−A string variable representing the name of the window.A Mat object representing the contents of an image.It is recommended to invoke the waitKey() method after imshow().ExampleThe following example reads an image, converts it into a grayscale image, detects the edges in it and displays all the three images (original, gray-scale and, edges) in windows using HighGui.import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import ... Read More

Erosion and dilation are the two basic morphological operations. As the name implies, morphological operations are the set of operations that process images according to their shapes.During dilation operation additional pixels are added to an image boundary and, during erosion operation, additional pixels are removed from image boundaries, The total number of pixels added during the dilation process depends on the dimensions of the structuring element used.Morphological Gradient is the operation that is equal to the difference between dilation and erosion of an image. Each pixel value in the resulting image indicates the contrast intensity in the nearby pixels. This ... Read More

JShell implements REPL (Read-Evaluate-Print Loop) that reads the code from the command-line, evaluates the given snippet, and prints the result back to us.In JShell, it's possible to edit code from the default JShell editor by using JShell Editor Pad. We can also use the "/set" command to modify the default editor in order to define another one. When launching the "/edit" command, this editor can be used. In order to perform this operation, we can simply launch the "/set editor [editor]" command.Suppose we want to set the Notepad application as the default program for editing code, then just type the command: "/set editor ... Read More

The module is a named, self-describing collection of code and data. The code has been organized as a set of packages containing types like Java classes and interfaces. The data includes resources and other kinds of static information. We need to declare a module then add module-info.java at the root of the source code.Below is the template of the "module-info.java" file.module {    requires ;    requires ;    exports ;    exports ;    exports to }We can use certain command-line options that help us to modify existing modules and add dependencies to them, export ... Read More

JShell is an interactive command-line tool introduced in Java 9. It is also called a REPL tool that takes input, evaluates it, and prints output to the user.In the JShell tool, it's possible to list all variables created by using the internal command "/vars". We have different "/vars" commands available in the JShell tool as listed below./vars /vars [ID] /vars [Variable_Name] /vars -start /vars -all/vars: This command allows to us display the list of all active variables of the current session./vars [ID]: This command displays the variable and its value, corresponding to the entered ID. This ID corresponds to the name of ... Read More

A module that provides the implementation for the Service interface contains a "provides" statement in the module descriptor file. If the module doesn’t have the "provides" statement in the module descriptor file, the service loader can't load that module.We can create the Service Provider Interface by using below steps:We create a new Module com.tutorialspoint.serviceproviderinterface.In the src/main/java directory, we create "module-info.java" file.Inside our source directory, we create the package com.tutorialspoint.serviceproviderinterface.spi.Finally, we create the interface ServiceProviderInterface that contains a method: printServiceName() to be implemented.In the below, we can define Service Provider Interface.package com.tutorialspoint.serviceproviderinterface.spi; public interface ServiceProviderInterface {    void printServiceName(); }Read More