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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to convert a colored image to blue/green/red image using Java OpenCV library?
The cvtColor() method of the Imgproc class changes/converts the color of the image from one to another. This method accepts three parameters −src − A Matrix object representing source.dst − A Matrix object representing the destination.code − An integer value representing the color of the destination image.To convert a colored image to grayscale you need to pass Imgproc.COLOR_RGB2BGR as the third parameter to this method.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class ColorToGrayscale { public static void main(String args[]) throws Exception { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); ...
Read MoreHow to write an image using Java OpenCV library?
Using the OpenCV library you can perform image processing operations such as image filtering, geometrical image transformations, color space conversion, histograms, etc.Writing an imageWhenever you read the contents of an image using the imread() method of the Imgcodecs class the result is read into the Matrix object.You can write/save an image using the imwrite() method. This accepts two parameters namely −File − A string value representing the file path to which the result should be stored.Img − A matrix object containing the data of the image to be saved.ExampleThe following Java example reads the contents of the image cat.jpg as a ...
Read MoreWhat is an unnamed module in Java 9?
An unnamed module is a concept of the unnamed package. It is a module in which packages or classes can't be defined in any named module but exist in the jar file from classpath. If our code can try to load type from those files, the module system attempts to lookup classpath and loads it.An unnamed module read all other modules, including all of the named, built-in platform modules, and also exports all of its packages. The package in an unnamed module can be ignored, which is also defined in the named module.The unnamed module has access to:All packages exported ...
Read MoreHow to traverse a process tree of Process API in Java 9?
Java 9 has improved Process API, and it helps to manage and control operating system processes. Before Java 9, it has been difficult to manage and control operating system processes using Java programs. Since Java 9, new classes and interfaces have added to control the operating system process through Java programs. New interfaces like ProcessHandle and ProcessHandle.Info have added, and also new methods have added to Process class.In the below example, we can traverse a process tree (children and descendant processes) of Process API.Exampleimport java.io.IOException; public class ProcessTreeTest { public static void main(String args[]) throws IOException ...
Read MoreHow can we get an ID of the running process in Java 9?
Java 9 has added improvements to Process API for getting PID of running process, getting children and/or descendants of a process, and also added a new class that helps to list out all running processes, getting information about an arbitrary process, and traversing process tree. The information returned by these methods can be a snapshot of processes running on the OS.In the below example, we can get an ID of the running process by using the pid() method of ProcessHandle.Examplepublic class ProcessHandleTest { public static void main(String args[]) { ProcessHandle processHandle ...
Read MoreHow can we load a source code into JShell in Java 9?
JShell is an interactive tool for learning Java, and it is a REPL(Read-Evaluate-Print-Loop) that evaluates declarations, statements, and expressions.While leaving a JShell session, we want to reuse the code previously entered into a new session. This can be done by using the command: /open [File_Path]. This command will load all code and internal commands found in file[File_Path] supplied as an option.In the below code snippet, we can use the "/open [File_Path]" command to load source code from the directory with the ".jsh" extension.C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro ...
Read MoreHow to sort the output in PowerShell?
To sort the output in the PowerShell you need to use Sort-Object Pipeline cmdlet. In the below example, we will retrieve the output from the Get-Process command and we will sort the, according to memory and CPU usage.ExampleGet-Process | Sort-Object WorkingSet | Select -First 10OutputHandles NPM(K) PM(K) WS(K) CPU(s) Id SI ProcessName ------- ------ ----- ----- ------ -- -- ----------- 0 0 60 8 0 ...
Read MoreWhat are automatic modules in Java 9?
An automatic module is a jar that we put on the modulepath. There is a number of pre-existing libraries that can be used in our applications, and many of these are not yet modularized. To facilitate migration, we can add any library’s jar file to an application’s module path, then use packages in that jar file. It can implicitly become an automatic module and can be specified in the module declaration’s requires directive. The jar’s filename becomes its module name that must be a valid Java identifier that can be used in "requires" directive.An automatic module:Implicitly exports all package types, ...
Read MoreHow to use Measure-Object in PowerShell?
Measure-Object in PowerShell is used to measure the property of the command. There are various measurement parameters are available. For example, Average, Count, sum, maximum, minimum and more.ExampleGet-Process | Measure-ObjectOutputPS C:\WINDOWS\system32> Get-Process | Measure-Object Count : 278 Average : Sum : Maximum : Minimum : Property :Here, in the above output, there are total 278 processes are running. If you want to check the maximum memory usage then you can use WorkingSet property with − Maximum Parameter.Get-Process | Measure-Object -Property WorkingSet -MaximumOutputPS C:\WINDOWS\system32> Get-Process | Measure-Object ...
Read MoreHow to check the PowerShell version installed in local and remote systems?
To check the PowerShell version installed in your system, you can use either $PSVersionTable or $host command.Check if $host command available in remote servers.Open the PowerShell console in the system and run the command $PSVersionTable.$PSVersionTableOutputPS C:\WINDOWS\system32> $PSVersionTable Name Value ---- ----- PSVersion 5.1.18362.628 PSEdition Desktop PSCompatibleVersions ...
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