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📜  Java DIP-添加边框

📅  最后修改于: 2020-12-14 05:38:11             🧑  作者: Mango

在本章中，我们学习向图像添加不同类型的边框。

我们使用OpenCV函数copyMakeBorder 。可以在Imgproc软件包下找到。其语法如下-

Imgproc.copyMakeBorder(source,destination,top,bottom,left,right,borderType);

参数说明如下-

Sr.No. Parameter & Description
1

source

It is source image.
2

destination

It is destination image.
3

top

It is the length in pixels of the border at the top of the image.
4

bottom

Length in pixels of the border at the bottom of the image.
5

left

It is the length in pixels of the border at the left of the image.
6

right

It is the length in pixels of the border at the right of the image.
7

borderType

It defines the type of border. The possible borders are BORDER_REPLICATE, BORDER_REFLECT, BORDER_WRAP, BORDER_CONSTANT etc.

除了copyMakeBorder()方法之外，Imgproc类还提供其他方法。他们简要描述-

Sr.No. Method & Description
1

cvtColor(Mat src, Mat dst, int code, int dstCn)

It converts an image from one color space to another.
2

dilate(Mat src, Mat dst, Mat kernel)

It dilates an image by using a specific structuring element.
3

equalizeHist(Mat src, Mat dst)

It equalizes the histogram of a grayscale image.
4

filter2D(Mat src, Mat dst, int depth, Mat kernel, Point anchor, double delta)

It convolves an image with the kernel.
5

GaussianBlur(Mat src, Mat dst, Size ksize, double sigmaX)

It blurs an image using a Gaussian filter.
6

integral(Mat src, Mat sum)

It calculates the integral of an image.

例

以下示例演示了如何使用Imgproc类向图像添加边框-

import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;

import org.opencv.highgui.Highgui;
import org.opencv.imgproc.Imgproc;

public class main {
   public static void main( String[] args ) {
   
      try {
         System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
         Mat source = Highgui.imread("digital_image_processing.jpg",
         
         Highgui.CV_LOAD_IMAGE_COLOR);
         Mat destination = new Mat(source.rows(),source.cols(),source.type());
         
         int top, bottom, left, right;
         int borderType;

         /// Initialize arguments for the filter
         top = (int) (0.05*source.rows()); 
         bottom = (int) (0.05*source.rows());
         left = (int) (0.05*source.cols()); 
         right = (int) (0.05*source.cols());

         destination = source;
         Imgproc.copyMakeBorder(source, destination, top, bottom, left, right, Imgproc.BORDER_WRAP);
         Highgui.imwrite("borderWrap.jpg", destination);
         
      } catch (Exception e) {
         System.out.println("error: " + e.getMessage());
      }
   }
}

输出

当您执行给定的代码时，将看到以下输出-

原始图片

添加边框教程

孤立的边框图像

添加边框教程

包装的边框图像

添加边框教程

反射边框图像

添加边框教程