OpenCV Filters - Blur

Blurs an image using the normalized box filter.

C++: void blur(InputArray src, OutputArray dst, Size ksize, Point anchor=Point(-1,-1), int borderType=BORDER_DEFAULT ) 
Python: cv2.blur(src, ksize[, dst[, anchor[, borderType]]]) → dst
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Parameters:

src – input image; it can have any number of channels, which are processed independently, but the depth should be CV_8U, CV_16U, CV_16S, CV_32F or CV_64F. dst – output image of the same size and type as src. ksize – blurring kernel size. anchor – anchor point; default value Point(-1,-1) means that the anchor is at the kernel center. borderType – border mode used to extrapolate pixels outside of the image.

The function smoothes an image using the kernel:

The call blur(src, dst, ksize, anchor, borderType) is equivalent to boxFilter(src, dst, src.type(), anchor, true, borderType)

Reference: OpenCV Documentation - blur

Example
This is a sample code (C++) with images for opencv blur filter.

 string imgFileName = "lena.jpg";

 cv::Mat src = cv::imread(imgFileName);
 if (!src.data){
    cout << "Unable to open file" << endl;
    getchar();
    return 1;
 }

 cv::Mat dst;
 cv::blur(src, dst, cv::Size(19, 19));

 cv::namedWindow("Source");
 cv::namedWindow("Filtered");

 cv::imshow("Source", src);
 cv::imshow("Filtered", dst);
 cv::waitKey(0);

 cv::imwrite("Blur.jpg", dst);

 return 0;

Filtered Image	Source Image

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