OpenCV 下 op::putText 显示中文的方法
//头上加入 #include <hstring.h>
//方法开始 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 paDrawString(cv::Mat& dst, const char* str, cv::Point org, cv::Scalar color, int fontSize, 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; //此处可定义使用的字体 strcpy(lf.lfFaceName, "宋体"); 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(buf, str); //处理多行 { int nnh = 0; int cw, ch; const char* ln = strtok(buf, "\n"); while (ln != 0) { GetStringSize(hDC, ln, &cw, &ch); strBaseW = std::max(strBaseW, cw); strBaseH = std::max(strBaseH, ch); ln = strtok(0, "\n"); 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(buf, str); const char* ln = strtok(buf, "\n"); int outTextY = 0; while (ln != 0) { TextOutA(hDC, 0, outTextY, ln, strlen(ln)); outTextY += singleRow; ln = strtok(0, "\n"); } 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); }
调用时替换原有的 cv:putText
paDrawString(*show_img, labelstr, pt_text, black_color, 12, 0, 0); //cv::putText(*show_img, labelstr, pt_text, cv::FONT_HERSHEY_COMPLEX_SMALL, font_size, black_color, 2 * font_size, CV_AA);