相关链接
C++&Python&Csharp in OpenCV 专栏
【2022B站最好的OpenCV课程推荐】OpenCV从入门到实战 全套课程(附带课程课件资料+课件笔记)
前言
今天来接着学习OpenCV,现在主要是以Python代码为主了,所以先实现Python,在用C++/Csharp重现一遍。
测试图片
边界填充
边界填充就是向外填充图片信息,将图片扩大。填充分为上下左右四个方向,所以我们要指定四个方向的填充大小。
python
# %%
# 导入包
import cv2
import matplotlib.pyplot as plt
import numpy as np
image = cv2.imread("D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png")
# 声明填充区域
fill = {
'top':50,
'bottom':50,
'left':50,
'right':50
}
# 填充也有很多的算法,我们这里尝试几个算法
replicate = cv2.copyMakeBorder(image,fill['top'],fill['bottom'],fill['left'],fill['right'], cv2.BORDER_REPLICATE)
reflect = cv2.copyMakeBorder(image,fill['top'],fill['bottom'],fill['left'],fill['right'],cv2.BORDER_REFLECT)
reflect101 = cv2.copyMakeBorder(image,fill['top'],fill['bottom'],fill['left'],fill['right'],cv2.BORDER_REFLECT_101)
wrap = cv2.copyMakeBorder(image,fill['top'],fill['bottom'],fill['left'],fill['right'],cv2.BORDER_WRAP)
constant = cv2.copyMakeBorder(image,fill['top'],fill['bottom'],fill['left'],fill['right'],cv2.BORDER_CONSTANT,value=0)
plt.subplot(231),plt.imshow(image,'gray'),plt.title('ORIGINAL')
plt.subplot(232),plt.imshow(replicate,'gray'),plt.title('replicate')
plt.subplot(233),plt.imshow(reflect,'gray'),plt.title('reflect')
plt.subplot(234),plt.imshow(reflect101,'gray'),plt.title('reflect101')
plt.subplot(235),plt.imshow(wrap,'gray'),plt.title('wrap')
plt.subplot(236),plt.imshow(constant,'gray'),plt.title('constant')
plt.show()
# cv2.imshow("python",image)
# cv2.waitKey(0)
# cv2.destroyAllWindows()
C++
Python跑好了,但是C++和Csharp没有matplotlib.pyplot这个库,得去自己手动导入一下
额,我还是放弃了。我把相关的连接放在这里了,C++的环境配置实在是过于麻烦,要修改项目配置,还要修改文件内容,还要添加环境变量。我这里就不做对应的配置了。我尝试配置了一下,没配置出来
C++调用matplotlib绘图总结
c++调用matplotlib(一)
Visual Studio配置C++绘图库matplotlibcpp的方法
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include<iostream>
using namespace std;
int main()
{
cv::Mat image = cv::imread("D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png");
auto fill = new int[4] {50, 50, 50, 50};
//声明变量
cv::Mat replicate;
cv::Mat reflect;
cv::Mat reflect101;
cv::Mat wrap;
cv::Mat constant;
//运行边界填充
cv::copyMakeBorder(image, replicate, fill[0], fill[1], fill[2], fill[3], cv::BORDER_REPLICATE);
cv::copyMakeBorder(image, reflect, fill[0], fill[1], fill[2], fill[3], cv::BORDER_REFLECT);
cv::copyMakeBorder(image, reflect101, fill[0], fill[1], fill[2], fill[3], cv::BORDER_REFLECT101);
cv::copyMakeBorder(image, wrap, fill[0], fill[1], fill[2], fill[3], cv::BORDER_WRAP);
cv::copyMakeBorder(image, constant, fill[0], fill[1], fill[2], fill[3], cv::BORDER_CONSTANT);
cv::imshow("image", image);
cv::imshow("replicate", replicate);
cv::imshow("reflect", reflect);
cv::imshow("reflect101", reflect101);
cv::imshow("wrap", wrap);
cv::imshow("constant", constant);
cv::waitKey(0);
cv::destroyAllWindows();
return 0;
}
Csharp
Csharp我倒是跑通了,没想到Csharp反而是最简单的了。
PythonNet,Csharp如何白嫖Python生态和使用Matplotlib
错误代码
static void Main(string[] args)
{
Mat image = Cv2.ImRead("D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png");
(int top, int bottom, int left, int right) fill = (50, 50, 50, 50);
Mat replicate = new Mat();
Mat reflect = new Mat();
Mat reflect101 = new Mat();
Mat wrap = new Mat();
Mat constant = new Mat();
Cv2.CopyMakeBorder(image, replicate, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Replicate);
Cv2.CopyMakeBorder(image, reflect, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Reflect);
Cv2.CopyMakeBorder(image, reflect101, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Reflect101);
Cv2.CopyMakeBorder(image, wrap, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Wrap);
Cv2.CopyMakeBorder(image, constant, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Constant);
//Cv2.ImShow("name",image);
//Cv2.WaitKey(0);
//选择你Python的dll位置
Runtime.PythonDLL = @"D:\Anaconda3\python311.dll";
//创建Python环境
PythonEngine.Initialize();
//展开Python的全局解释器
using (Py.GIL())
{
dynamic plt = Py.Import("matplotlib.pyplot");
plt.subplot(231); plt.imshow(image, "gray"); plt.title("image");
plt.show();
Console.WriteLine("运行完毕");
Console.ReadLine();
}
}
我们直接用是不可以的,因为他底层的代码不一样。matplotlib必须要是数组形式的数据输入。那我们需要将Mat转化为数组。
Mat遍历
Opencv:通过Mat遍历图像的5种方法
C++ 高效的遍历opencv Mat像素
我这里就直接上结果了
/// <summary>
/// 3通道遍历
/// </summary>
/// <param name="mat"></param>
/// <returns></returns>
public static int[,,] MatToArray(Mat mat)
{
var res = new int[mat.Rows, mat.Cols, mat.Channels()];
for(var i =0 ; i < mat.Rows;i++)
{
for(var j = 0 ; j < mat.Cols; j++)
{
var temp = mat.At<Vec3b>(i, j);
res[i,j,0] = temp[0];
res[i,j,1] = temp[1];
res[i,j,2] = temp[2];
}
}
return res;
}
最终代码和结果
internal class Program
{
static void Main(string[] args)
{
Mat image = Cv2.ImRead("D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png");
(int top, int bottom, int left, int right) fill = (50, 50, 50, 50);
Mat replicate = new Mat();
Mat reflect = new Mat();
Mat reflect101 = new Mat();
Mat wrap = new Mat();
Mat constant = new Mat();
Cv2.CopyMakeBorder(image, replicate, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Replicate);
Cv2.CopyMakeBorder(image, reflect, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Reflect);
Cv2.CopyMakeBorder(image, reflect101, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Reflect101);
Cv2.CopyMakeBorder(image, wrap, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Wrap);
Cv2.CopyMakeBorder(image, constant, fill.top, fill.bottom, fill.left, fill.right, BorderTypes.Constant);
//选择你Python的dll位置
Runtime.PythonDLL = @"D:\Anaconda3\python311.dll";
//创建Python环境
PythonEngine.Initialize();
//展开Python的全局解释器
using (Py.GIL())
{
dynamic plt = Py.Import("matplotlib.pyplot");
//转化成3通道数组
plt.subplot(231); plt.imshow(MatToArray(image), "gray"); plt.title("image");
plt.subplot(232); plt.imshow(MatToArray(replicate), "gray"); plt.title("replicate");
plt.subplot(233); plt.imshow(MatToArray(reflect), "gray"); plt.title("reflect");
plt.subplot(234); plt.imshow(MatToArray(reflect101), "gray"); plt.title("reflect101");
plt.subplot(235); plt.imshow(MatToArray(wrap), "gray"); plt.title("wrap");
plt.subplot(236); plt.imshow(MatToArray(constant), "gray"); plt.title("constant");
//展示结果
plt.show();
Console.WriteLine("运行完毕");
Console.ReadLine();
}
}
/// <summary>
/// 3通道遍历
/// </summary>
/// <param name="mat"></param>
/// <returns></returns>
public static int[,,] MatToArray(Mat mat)
{
var res = new int[mat.Rows, mat.Cols, mat.Channels()];
for(var i =0 ; i < mat.Rows;i++)
{
for(var j = 0 ; j < mat.Cols; j++)
{
var temp = mat.At<Vec3b>(i, j);
res[i,j,0] = temp[0];
res[i,j,1] = temp[1];
res[i,j,2] = temp[2];
}
}
return res;
}
}
文章来源:https://www.toymoban.com/news/detail-818485.html
总结
今天不仅了解了一下这个代码,还顺便了解了一下Csharp怎么代用Python的matplotlib。C++ 没配成功,看网上的代码太麻烦了,而且我也不用C++ 作为开发软件,只是单纯的稍微了解一下。文章来源地址https://www.toymoban.com/news/detail-818485.html
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