OpenCV显示中文汉字，未使用CvxText和FreeType库
OpenCV顯示中文漢字，未使用CvxText和FreeType庫
采用windows的GDI顯示系統(tǒng)的TrueType字體，沒有封裝，就兩個函數(shù)，分成了h和cpp文件，可以自己編輯文件名和函數(shù)名，亦可以直接將cpp的代碼復(fù)制到你需要的程序中。
- putText.h
- putText.cpp
- 演示
文件putText.h
后面的cpp文件有一些簡要說明。
#ifndef PUTTEXT_H_
#define PUTTEXT_H_
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#include <windows.h>
#include <string>
#include <opencv2/opencv.hpp>
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using namespace cv;
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void GetStringSize(HDC hDC, const char* str, int* w, int* h);
void putTextZH(Mat &dst, const char* str, Point org, Scalar color, int fontSize,
??? const char *fn = "Arial", bool italic = false, bool underline = false);
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#endif // PUTTEXT_H_
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putText.cpp
第二個函數(shù)putTextZH()，默認(rèn)使用Arial字體，也可以設(shè)置成操作系統(tǒng)中已經(jīng)安裝的字體，如“宋體”、“微軟雅黑”、“Times New Roman”等；默認(rèn)顯示非斜體、非下劃線。
#include "putText.h"
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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;
}
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void putTextZH(Mat &dst, const char* str, Point org, Scalar color, int fontSize, const char* fn, bool italic, bool underline)
{
??? CV_Assert(dst.data != 0 && (dst.channels() == 1 || dst.channels() == 3));
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??? 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;
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??? LOGFONTA lf;
??? lf.lfHeight = -fontSize;
??? lf.lfWidth = 0;
??? lf.lfEscapement = 0;
??? lf.lfOrientation = 0;
??? lf.lfWeight = 5;
??? lf.lfItalic = italic;?? //斜體
??? lf.lfUnderline = underline; //下劃線
??? 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);
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??? HFONT hf = CreateFontIndirectA(&lf);
??? HDC hDC = CreateCompatibleDC(0);
??? HFONT hOldFont = (HFONT)SelectObject(hDC, hf);
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??? int strBaseW = 0, strBaseH = 0;
??? int singleRow = 0;
??? char buf[1 << 12];
??? strcpy_s(buf, str);
??? char *bufT[1 << 12];? // 這個用于分隔字符串后剩余的字符，可能會超出。
??????????????????????? ? //處理多行
??? {
??????? int nnh = 0;
??????? int cw, ch;
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??????? const char* ln = strtok_s(buf, "\n", bufT);
??????? while (ln != 0)
??????? {
??????????? GetStringSize(hDC, ln, &cw, &ch);
??????????? strBaseW = max(strBaseW, cw);
??????????? strBaseH = max(strBaseH, ch);
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??????????? ln = strtok_s(0, "\n", bufT);
??????????? nnh++;
??????? }
??????? singleRow = strBaseH;
??????? strBaseH *= nnh;
??? }
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??? if (org.x + strBaseW < 0 || org.y + strBaseH < 0)
??? {
??????? SelectObject(hDC, hOldFont);
??????? DeleteObject(hf);
??????? DeleteObject(hDC);
??????? return;
??? }
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??? 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;
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??? BITMAPINFO bmp = { 0 };
??? BITMAPINFOHEADER& bih = bmp.bmiHeader;
??? int strDrawLineStep = strBaseW * 3 % 4 == 0 ? strBaseW * 3 : (strBaseW * 3 + 4 - ((strBaseW * 3) % 4));
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??? 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;
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??? void* pDibData = 0;
??? HBITMAP hBmp = CreateDIBSection(hDC, &bmp, DIB_RGB_COLORS, &pDibData, 0, 0);
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??? CV_Assert(pDibData != 0);
??? HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);
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??? //color.val[2], color.val[1], color.val[0]
??? SetTextColor(hDC, RGB(255, 255, 255));
??? SetBkColor(hDC, 0);
??? //SetStretchBltMode(hDC, COLORONCOLOR);
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??? 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);
??????????? }
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??????????? subStr += 3;
??????????? subImg += dst.channels();
??????? }
??? }
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??? SelectObject(hDC, hOldBmp);
??? SelectObject(hDC, hOldFont);
??? DeleteObject(hf);
??? DeleteObject(hBmp);
??? DeleteDC(hDC);
}
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演示
讀取一個圖片加入字體，顯示。
#include "opencv2/opencv.hpp"
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#include "putText.h"
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using namespace std;
using namespace cv;
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int main()
{
??? Mat img = imread("1000.jpg");
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??? putTextZH(img, "Arial字體換...\n行顯示!", Point(50, 50), Scalar(0, 0, 255), 30, "Arial");
??? putTextZH(img, "微軟雅黑字體換...\n行，斜體，下劃線，顯示!", Point(50, 100), Scalar(0, 255, 0), 30, "微軟雅黑", true, true);
??? putTextZH(img, "楷體字體換...\n行，斜體，下劃線，顯示!", Point(50, 200), Scalar(128, 255, 0), 30, "楷體", true, true);
??? putTextZH(img, "梁朝偉", Point(500, 500), Scalar(0, 0, 255), 30, "楷體", false, false);
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??? imshow("test", img);
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??? waitKey();
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??? return 0;
}
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