营销型网站建设网站建设资讯,昆山外贸网站建设推广,宁波市国家高新区建设局网站,浙江做电缆桥架的公司网站文章目录 相关链接前言阈值阈值使用代码PythonCCsharpcsharp代码问题 总结 相关链接 CPythonCsharp 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#xff08;附带课程课件资料课件笔记#xff09; OpenCV一个窗口同时显示多张图片 … 文章目录 相关链接前言阈值阈值使用代码PythonCCsharpcsharp代码问题 总结 相关链接 CPythonCsharp 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 OpenCV一个窗口同时显示多张图片 (C) 前言
我感觉我之前的比较实在是太过于偏代码了缺少了图形学的知识的记录。之后的笔记我会把图形学的知识也记录上去。
阈值
阈值简单来说就是增强图片的对比。用过Ps的人就知道阈值是什么意思在电脑绘画中用的还是比较多的 阈值使用 代码
Python
# %%
# 导入包
import cv2
import matplotlib.pyplot as plt
import numpy as npimage {image:,gray:,}image[image] cv2.imread(D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png)# 获取颜色通道因为cv2是BGR的顺序所以这里是B 灰度
image[gray] cv2.split(image[image])[0]thresh {1 : ,2: ,3: ,4: ,5:
}# 调用不同的阈值处理算子
ret , thresh[1] cv2.threshold(image[gray],127,255,cv2.THRESH_BINARY)
ret , thresh[2] cv2.threshold(image[gray],127,255,cv2.THRESH_BINARY_INV)
ret , thresh[3] cv2.threshold(image[gray],127,255,cv2.THRESH_TRUNC)
ret , thresh[4] cv2.threshold(image[gray],127,255,cv2.THRESH_TOZERO)
ret , thresh[5] cv2.threshold(image[gray],127,255,cv2.THRESH_TOZERO_INV)# 将数据总和成数组
titles [iamge,binary,binary inv,trunc,tozero,tozero inv]
images [image[gray],thresh[1],thresh[2],thresh[3],thresh[4],thresh[5]]# 循环赋值到plt中
for i in range(6):plt.subplot(2,3,i1),plt.imshow(images[i],gray)plt.title(titles[i])plt.xticks([]),plt.yticks([])plt.show()C
这里为了一次性展示多个窗口我就CSDN上面找了个方法 OpenCV一个窗口同时显示多张图片 (C) #include opencv2/opencv.hpp
#include opencv2/core/core.hpp
#include opencv2/highgui/highgui.hpp
#include opencv2/imgproc.hpp
#includeiostream
#include vector
using namespace std;
using namespace cv;vectorMat imageVector;void multipleImage(vectorMat imgVector, Mat dst, int imgCols)
{const int MAX_PIXEL 300;int imgNum imgVector.size();//选择图片最大的一边 将最大的边按比例变为300像素Size imgOriSize imgVector[0].size();int imgMaxPixel max(imgOriSize.height, imgOriSize.width);//获取最大像素变为MAX_PIXEL的比例因子double prop imgMaxPixel MAX_PIXEL ? (double)imgMaxPixel / MAX_PIXEL : MAX_PIXEL / (double)imgMaxPixel;Size imgStdSize(imgOriSize.width * prop, imgOriSize.height * prop); //窗口显示的标准图像的SizeMat imgStd; //标准图片Point2i location(0, 0); //坐标点(从0,0开始)//构建窗口大小 通道与imageVector[0]的通道一样Mat imgWindow(imgStdSize.height * ((imgNum - 1) / imgCols 1), imgStdSize.width * imgCols, imgVector[0].type());for (int i 0; i imgNum; i){location.x (i % imgCols) * imgStdSize.width;location.y (i / imgCols) * imgStdSize.height;resize(imgVector[i], imgStd, imgStdSize, prop, prop, INTER_LINEAR); //设置为标准大小imgStd.copyTo(imgWindow(Rect(location, imgStdSize)));}dst imgWindow;
}int main()
{auto image imread(D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png);Mat showImage;Mat bgr[3];split(image, bgr);Mat gray bgr[0];Mat thresh[5];threshold(gray, thresh[0], 127, 255, THRESH_BINARY);threshold(gray, thresh[1], 127, 255, THRESH_BINARY_INV);threshold(gray, thresh[2], 127, 255, THRESH_TRUNC);threshold(gray, thresh[3], 127, 255, THRESH_TOZERO);threshold(gray, thresh[4], 127, 255, THRESH_TOZERO_INV);vectorMat images{gray,thresh[0],thresh[1], thresh[2], thresh[3], thresh[4], };multipleImage(images, showImage, 3);imshow(C, showImage);waitKey(0);destroyAllWindows();return 0;
}Csharp
还是那句话C跑通了Csharp抄抄就可以了。
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;namespace HelloOpenCV.Utils
{public static class MyOpenCV_Extensions{/// summary/// 3通道遍历/// /summary/// param namemat/param/// returns/returnspublic 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.AtVec3b(i, j);res[i, j, 0] temp[0];res[i, j, 1] temp[1];res[i, j, 2] temp[2];}}return res;}public static Mat MultipleImage(ListMat lists, int imgCols){const int MAX_PIXEL 300;int imgNum lists.Count;//选择图片最大的一边 将最大的边按比例变为300像素Size imgOriSize lists[0].Size();int imgMaxPixel Math.Max(imgOriSize.Height, imgOriSize.Width);//获取最大像素变为MAX_PIXEL的比例因子double prop imgMaxPixel MAX_PIXEL ? (double)imgMaxPixel / MAX_PIXEL : MAX_PIXEL / (double)imgMaxPixel;Size imgStdSize new Size(imgOriSize.Width* prop, imgOriSize.Height* prop); //窗口显示的标准图像的SizeMat imgStd new Mat(); //标准图片Point location new Point(0, 0); //坐标点(从0,0开始)//构建窗口大小 通道与imageVector[0]的通道一样Mat imgWindow new Mat(imgStdSize.Height* ((imgNum -1) / imgCols 1), imgStdSize.Width* imgCols, lists[0].Type());for (int i 0; i imgNum; i){location.X (i % imgCols) * imgStdSize.Width;location.Y (i / imgCols) * imgStdSize.Height;Cv2.Resize(lists[i], imgStd, imgStdSize, prop, prop, InterpolationFlags.Linear); //设置为标准大小imgStd.CopyTo(new Mat(imgWindow, new Rect(location, imgStdSize)) ); }return imgWindow;}}
}
运行代码 static void Main(string[] args){Mat image Cv2.ImRead(D:/workSpace/OpenCV/HellOpenCV/Resources/image/cat.png);Mat[] bgr new Mat[3];Cv2.Split(image, out bgr);Mat gray bgr[0];Mat[] threshs new Mat[5];for(var i 0; i threshs.Length; i){threshs[i] new Mat();}Cv2.Threshold(gray, threshs[0], 127, 255, ThresholdTypes.Binary);Cv2.Threshold(gray, threshs[1], 127, 255, ThresholdTypes.BinaryInv);Cv2.Threshold(gray, threshs[2], 127, 255, ThresholdTypes.Trunc);Cv2.Threshold(gray, threshs[3], 127, 255, ThresholdTypes.Tozero);Cv2.Threshold(gray, threshs[4], 127, 255, ThresholdTypes.TozeroInv);var res MyOpenCV_Extensions.MultipleImage(new ListMat() {gray, threshs[0], threshs[1], threshs[2], threshs[3], threshs[4] }, 3);Cv2.ImShow(Csharp, res);Cv2.WaitKey(0);Cv2.DestroyAllWindows();}csharp代码问题
遇到了几个坑
C是能直接把变量当做构造函数的C# 对应的代码是构造函数里面带Mat参数的 而且C的构造函数还不好定位我进去找不到源码。我不知道C 的代码是怎么调试的毕竟没怎么接触过 总结
跟之前的套路差不多Python跑通C 翻译Python上网查资料Csharp翻译C。我还是觉得Csharp优雅多了写起来舒服C 这个语法用起来有点痛苦。而且C 报错天天给我报内存变量报错我哪里能看得懂啊顶多定位到哪行代码。
