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You can blur an image by filtering it using a low-pass filter, this removes high frequency content (noise, edges) from an image.Averaging is one of the blurring techniques provided by OpenCV, this replaces the central element with the average of all the pixels in the kernel areaYou can filter/blur an image by this technique using the blur() or, boxFilter() methods, the blur() method accepts −Two Mat objects representing the source and destination images.A Size object representing the size of the kernel.An integer variable representing the anchor point.An integer variable of representing the type of the border to be used to ... Read More
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc.To draw a circle you need to invoke the circle() method of this class. This method accepts the following parameters −A Mat object representing the image on which the circle is to be drawn.A Point object representing the center of the circle.An integer variable representing the radius of the circle.A Scalar object representing the color of the circle(BGR).An integer representing the thickness of the circle(default 1).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; public class DrawingCircle { public static void main(String args[]) ... Read More
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw a rectangle you need to invoke the rectangle() method of this class. This method accepts the following parameters −A Mat object representing the image on which the rectangle is to be drawn.Two Point objects representing the vertices of the rectangle that is to be drawn.A Scalar object representing the color of the rectangle(BGR).An integer representing the thickness of the rectangle(default:1).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; public class DrawingRectangle { public static void main(String args[]) { ... Read More
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw an ellipse you need to invoke the ellipse() method of this class. This method accepts the following parameters −A Mat object representing the image on which the ellipse is to be drawn.A RotatedRect object (The ellipse is drawn inscribed in this rectangle.)A Scalar object representing the color of the Rectangle(BGR).An integer representing the thickness of the Rectangle(default:1).Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.Point; import org.opencv.core.RotatedRect; import org.opencv.core.Scalar; import org.opencv.core.Size; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class DrawingEllipse { public static void main(String args[]) { ... Read More
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw a line you need to invoke the line() method of this class. This method accepts the following parameters −A Mat object representing the image on which the line is to be drawn.Two Point objects representing the points between which the line is to be drawn.A Scalar object representing the color of the line. (BGR)An integer representing the thickness of the line(default:1).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; public class DrawingLine { Mat matrix = null; public static ... Read More
You can convert HLS image to RGB (colored) image by passing Imgproc.COLOR_RGB2HLS as the 3rd parameter to the cvtColor() method.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class HSL2RGB { public static void main(String args[]) throws Exception { System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); Mat src = Imgcodecs.imread("D:\images\car3.jpg"); Mat dst = new Mat(); Imgproc.cvtColor(src, dst, Imgproc.COLOR_RGB2HLS); Imgcodecs imageCodecs = new Imgcodecs(); imageCodecs.imwrite("D:\images\hslImage.jpg", dst); System.out.println("Image Saved"); } }InputOutput
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.You can convert a colored image to an HLS image by passing Imgproc.COLOR_RGB2HLS as a parameter to the above method.Exampleimport org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class RGB2HSL { public static void main(String args[]) throws Exception { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); ... Read More
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 an HSV image to BGR you need to pass Imgproc.COLOR_HSV2BGR as the 3rd parameter to the cvtColor() method.Examplepublic class HSV2RGB { public static void main(String args[]) throws Exception { System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); Mat src = Imgcodecs.imread("D:\images\hsvimage2.jpg"); Mat dst = new Mat(); ... Read More
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 an HSV image to RGB you need to pass Imgproc.COLOR_HSV2RGB 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 HSV2RGB { public static void main(String args[]) throws Exception { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); ... Read More
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 an RGB image to HSV you need to pass Imgproc.COLOR_RGB2HSV 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 RGB2HSV { public static void main(String args[]) throws Exception { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); ... Read More