In Gaussian Blur operation, the image is convolved with a Gaussian filter instead of the box filter. The Gaussian filter is a low-pass filter that removes the high-frequency components are reduced.
You can perform this operation on an image using the Gaussianblur()method of the imgproc class. Following is the syntax of this method −
GaussianBlur(src, dst, ksize, sigmaX)
This method accepts the following parameters −
- src − A Mat object representing the source (input image) for this operation.
- dst − A Mat object representing the destination (output image) for this operation.
- ksize − A Size object representing the size of the kernel.
- sigmaX − A variable of the type double representing the Gaussian kernel standard deviation in X direction.
Example
The following program demonstrates how to perform the Gaussian blur operation on an image.
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.Size; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class GaussianTest { public static void main(String args[]) { // Loading the OpenCV core library System.loadLibrary(Core.NATIVE_LIBRARY_NAME); // Reading the Image from the file and storing it in to a Matrix object String file ="C:/EXAMPLES/OpenCV/sample.jpg"; Mat src = Imgcodecs.imread(file); // Creating an empty matrix to store the result Mat dst = new Mat(); // Applying GaussianBlur on the Image Imgproc.GaussianBlur(src, dst, new Size(45, 45), 0); // Writing the image Imgcodecs.imwrite("E:/OpenCV/chap9/Gaussian.jpg", dst); System.out.println("Image Processed"); } }
Assume that following is the input image sample.jpg specified in the above program.
Output
On executing the program, you will get the following output −
Image Processed
If you open the specified path, you can observe the output image as follows −
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