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In mask operations the value of each pixel of an image is recalculated based on a given mask matrix, this is known as the kernel. Masking is otherwise known as filtering.The filter2D() method of the Imgproc class accepts a source, destination and kernel matrices and convolves the source matrix with the kernel matrix. Using this method you can mask or filter an image.Exampleimport 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 MaskingExample { public static void main( String[] args ) { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ... Read More
To setup JavaFx in eclipse, first of all, make sure that you have installed eclipse and Java in your system successfully.Maven dependencyTo set up JavaFX environment using maven dependency, create a Java project in eclipse convert it into a maven project as shown below −Then in the pom.xml file add the following JavaFX dependency and refresh the project. org.bytedeco opencv 4.1.0-1.5.1 If you observe the Maven Dependencies directory you can find the installed Jar files as shown below −Adding required Jar files manuallyYou can also add the required JAR files manually, to do soVisit the OpenCV home ... Read More
You can add borders to a given image using the copyMakeBorder() method, this method accepts the following parameters −Two Mat objects representing the source and destination images.An object of the class Mat representing the destination (output) image.Four integer variables representing the lengths of the borders in all the 4 directions of the image.An integer variable representing the type of the border that is 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 javafx.scene.image.ImageView; import javafx.scene.image.WritableImage; import javafx.stage.Stage; import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; public class AddingBorders extends Application { ... Read More
Thresholding is a simple technique for the segmentation of an image. it is often used to create binary images. In this, the pixels greater than a given threshold value will be replaced with a standard value.Adaptive thresholding is the method where the threshold value is calculated for smaller regions and therefore, there will be different threshold values for different regions.The adaptiveThreshold() method performs the Adaptive Threshold operation on the given image. Following are the parameters of this method −Two Mat objects representing the source and destination images.An integer variable representing the threshold value.Two integer variables representing the adaptive method and ... Read More
Thresholding is a simple technique for the segmentation of an image. it is often used to create binary images. In simple thresholding, the pixels greater than a given threshold value will be replaced with a standard value.The threshold() method performs the simple threshold operation on the given image. Following are the parameters of this method −Two Mat objects representing the source and destination images.Two integer variables representing the threshold or the standard value.An integer variable representing the type of the simple threshold.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 ... Read More
The Scharr operator for edge detections allows you to find the edges in a given image in both horizontal and vertical directions.The Scharr() method of the Imgproc class applies the Scharr edge detection algorithm on the given image. This method accepts −Two Mat objects representing the source and destination images.An integer variable representing the depth of an image.Two double variables to hold the x and y derivatives.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class ScharrEdgeDetection { public static void main(String args[]) { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); ... Read More
The Sobel operator for edge detections allows you to find the edges in a given image in both horizontal and vertical directions.The Sobel() method of the Imgproc class applies the Sobel Edge Detection algorithm on the given image. This method accepts −Two Mat objects representing the source and destination images.An integer variable representing the depth of an image.Two double variables to hold the x and y derivatives.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class SobelEdgeDetection { public static void main(String args[]) { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ... Read More
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
The histogram of an image shows the frequency of pixels’ intensity values. In an image histogram, the X-axis shows the gray level intensities and the Y-axis shows the frequency of these intensities and improves the contrast of an image.The equalizeHist() method of the Imgproc method accepts to Mat objects representing the source and destination images, equalizes the histogram of the source matrix and receives it in the destination matrix.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.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class ... Read More