opencv-图像上显示中文

运行环境：

vs2013、opencv3.3、win10-64bit

下载显示中文类：

OpenCV默认是不支持显示中文字符的，于是网上有人自己写了一个类实现，只需要下载到自己的代码文件中，添加头文件就可以通过调用函数来显示中文了。

1）显示中文类下载链接：（若链接失效，文字最后有源码）

百度网盘：https://pan.baidu.com/s/1gdYatLLOKmDI-_6OOzdQNg
提取码：o7p7

2）下载后文件名为：“puttextzh.cpp”，“puttextzh.cpp”

3）将这两个文件加入到项目文件夹中，并加入工程中

4）使用时加入头文件“puttextzh.h”

函数原型：

void putTextZH(cv::Mat &dst, const char* str, cv::Point org, cv::Scalar color, int fontSize, const char* fn, bool italic, bool underline)

参数解释：

dst：输入，原图像，即待加中文的图像；

str：中文字符串；

org：字符串像素点位置：

color：字符串颜色；

fontSize：字体大小；

fn：字体类型（默认Arial字体类型）：

italic：斜体（默认无斜体）：

underline：下划线（默认无下划线）：

示例代码：

在lenna图像坐标为(50,60)位置加上字符串“我的名字叫lenna”，字体颜色：白色，字体大小：40，字体类型：微软雅黑

putTextZH(srcImg, "我的名字叫lenna", Point(50, 60), Scalar(255, 255, 255), 40, "微软雅黑");

#include<iostream>
#include"opencv2/opencv.hpp"
#include"opencv2/highgui/highgui.hpp"
#include"puttextzh.h"using namespace std;
using namespace cv;int main()
{Mat srcImg = imread("E:\\Project\\opencvPicture\\lenna.jpg");//打开图像if (srcImg.empty())//判断是否正确打开图片{cout << "加载图像失败！" << endl;return -1;}imshow("原图", srcImg);//显示原图putTextZH(srcImg, "我的名字叫lenna", Point(50, 60), Scalar(255, 255, 255), 40, "微软雅黑");//图像上加中文imshow("原图加中文", srcImg);waitKey(0);return 0;
}

运行结果：

中文类库源码：

puttextzh.cpp

#include "puttextzh.h"
#include "windows.h"void GetStringSize(HDC hDC, const char* str, int* w, int* h)
{SIZE size;GetTextExtentPoint32A(hDC, str, strlen(str), &size);if (w != 0) *w = size.cx;if (h != 0) *h = size.cy;
}void putTextZH(cv::Mat &dst, const char* str, cv::Point org, cv::Scalar color, int fontSize, const char* fn, bool italic, bool underline)
{CV_Assert(dst.data != 0 && (dst.channels() == 1 || dst.channels() == 3));int x, y, r, b;if (org.x > dst.cols || org.y > dst.rows) return;x = org.x < 0 ? -org.x : 0;y = org.y < 0 ? -org.y : 0;LOGFONTA lf;lf.lfHeight = -fontSize;lf.lfWidth = 0;lf.lfEscapement = 0;lf.lfOrientation = 0;lf.lfWeight = 5;lf.lfItalic = italic;   //斜体lf.lfUnderline = underline; //下划线lf.lfStrikeOut = 0;lf.lfCharSet = DEFAULT_CHARSET;lf.lfOutPrecision = 0;lf.lfClipPrecision = 0;lf.lfQuality = PROOF_QUALITY;lf.lfPitchAndFamily = 0;strcpy_s(lf.lfFaceName, fn);HFONT hf = CreateFontIndirectA(&lf);HDC hDC = CreateCompatibleDC(0);HFONT hOldFont = (HFONT)SelectObject(hDC, hf);int strBaseW = 0, strBaseH = 0;int singleRow = 0;char buf[1 << 12];strcpy_s(buf, str);char *bufT[1 << 12];  // 这个用于分隔字符串后剩余的字符，可能会超出。//处理多行{int nnh = 0;int cw, ch;const char* ln = strtok_s(buf, "\n",bufT);while (ln != 0){GetStringSize(hDC, ln, &cw, &ch);strBaseW = max(strBaseW, cw);strBaseH = max(strBaseH, ch);ln = strtok_s(0, "\n",bufT);nnh++;}singleRow = strBaseH;strBaseH *= nnh;}if (org.x + strBaseW < 0 || org.y + strBaseH < 0){SelectObject(hDC, hOldFont);DeleteObject(hf);DeleteObject(hDC);return;}r = org.x + strBaseW > dst.cols ? dst.cols - org.x - 1 : strBaseW - 1;b = org.y + strBaseH > dst.rows ? dst.rows - org.y - 1 : strBaseH - 1;org.x = org.x < 0 ? 0 : org.x;org.y = org.y < 0 ? 0 : org.y;BITMAPINFO bmp = { 0 };BITMAPINFOHEADER& bih = bmp.bmiHeader;int strDrawLineStep = strBaseW * 3 % 4 == 0 ? strBaseW * 3 : (strBaseW * 3 + 4 - ((strBaseW * 3) % 4));bih.biSize = sizeof(BITMAPINFOHEADER);bih.biWidth = strBaseW;bih.biHeight = strBaseH;bih.biPlanes = 1;bih.biBitCount = 24;bih.biCompression = BI_RGB;bih.biSizeImage = strBaseH * strDrawLineStep;bih.biClrUsed = 0;bih.biClrImportant = 0;void* pDibData = 0;HBITMAP hBmp = CreateDIBSection(hDC, &bmp, DIB_RGB_COLORS, &pDibData, 0, 0);CV_Assert(pDibData != 0);HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);//color.val[2], color.val[1], color.val[0]SetTextColor(hDC, RGB(255, 255, 255));SetBkColor(hDC, 0);//SetStretchBltMode(hDC, COLORONCOLOR);strcpy_s(buf, str);const char* ln = strtok_s(buf, "\n",bufT);int outTextY = 0;while (ln != 0){TextOutA(hDC, 0, outTextY, ln, strlen(ln));outTextY += singleRow;ln = strtok_s(0, "\n",bufT);}uchar* dstData = (uchar*)dst.data;int dstStep = dst.step / sizeof(dstData[0]);unsigned char* pImg = (unsigned char*)dst.data + org.x * dst.channels() + org.y * dstStep;unsigned char* pStr = (unsigned char*)pDibData + x * 3;for (int tty = y; tty <= b; ++tty){unsigned char* subImg = pImg + (tty - y) * dstStep;unsigned char* subStr = pStr + (strBaseH - tty - 1) * strDrawLineStep;for (int ttx = x; ttx <= r; ++ttx){for (int n = 0; n < dst.channels(); ++n){double vtxt = subStr[n] / 255.0;int cvv = vtxt * color.val[n] + (1 - vtxt) * subImg[n];subImg[n] = cvv > 255 ? 255 : (cvv < 0 ? 0 : cvv);}subStr += 3;subImg += dst.channels();}}SelectObject(hDC, hOldBmp);SelectObject(hDC, hOldFont);DeleteObject(hf);DeleteObject(hBmp);DeleteDC(hDC);
}

puttextzh.h

#ifndef PUTTEXTZH_H_
#define PUTTEXTZH_H_
//#include "opencv.hpp"
#include "opencv2/opencv.hpp"void putTextZH(cv::Mat &dst, const char* str, cv::Point org, cv::Scalar color, int fontSize,const char *fn = "Arial", bool italic = false, bool underline = false);#endif // PUTTEXT_H_

参考：https://blog.csdn.net/mars_xiaolei/article/details/91381148