Opencv C++写中文(来自Gemini)

基于与Google Gemini交互获取的Opencv在图片上写汉字的实现

sudo apt-get install libfreetype6-dev
sudo apt-get install fonts-wqy-zenhei

CMakeLists.txt

cmake_minimum_required(VERSION 3.10) # Or a more recent versionproject(OpenCVChineseText)set(CMAKE_CXX_STANDARD 17) # Or your preferred C++ standard
set(CMAKE_CXX_STANDARD_REQUIRED ON)# --- Find OpenCV ---
find_package(OpenCV REQUIRED)
if(OpenCV_FOUND)message(STATUS "Found OpenCV: ${OpenCV_DIR}")include_directories(${OpenCV_INCLUDE_DIRS})
else()message(FATAL_ERROR "OpenCV not found. Please set OpenCV_DIR or ensure it's in your PATH.")
endif()# --- Find FreeType ---
find_package(Freetype REQUIRED)
if(Freetype_FOUND)message(STATUS "Found FreeType: ${FREETYPE_DIR}")include_directories(${FREETYPE_INCLUDE_DIRS})
else()message(FATAL_ERROR "FreeType not found. Please ensure it's installed.")
endif()# --- Add Executable ---
add_executable(opencv_chinese_text main.cpp) # Replace main.cpp with your source file(s)# --- Link Libraries ---
target_link_libraries(opencv_chinese_text${OpenCV_LIBS}${FREETYPE_LIBRARIES}
)# --- Optional: Install target ---
install(TARGETS opencv_chinese_text DESTINATION bin)
install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/fonts DESTINATION share/opencv_chinese_text) # If you have a fonts folder

main.cpp

#include <iostream>
#include <string>
#include <vector>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <opencv2/opencv.hpp>
#include <locale>
#include <codecvt>int main()
{cv::Mat image = cv::Mat::zeros(200, 500, CV_8UC3);std::string chineseText = "你好，世界";int fontSize = 48;int x = 50, y = 100;cv::Scalar textColor(255, 255, 255); // White color for textFT_Library library;if (FT_Init_FreeType(&library)){std::cerr << "Error initializing FreeType library" << std::endl;return -1;}FT_Face face;if (FT_New_Face(library, "/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc", 0, &face)){std::cerr << "Error loading font file" << std::endl;FT_Done_FreeType(library);return -1;}FT_Set_Pixel_Sizes(face, 0, fontSize);std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;std::wstring wide_text = converter.from_bytes(chineseText);for (wchar_t wc : wide_text){FT_UInt glyph_index = FT_Get_Char_Index(face, wc);if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER)){std::cerr << "Error loading glyph" << std::endl;continue;}FT_Bitmap &bitmap = face->glyph->bitmap;for (int i = 0; i < bitmap.rows; ++i){for (int j = 0; j < bitmap.width; ++j){unsigned char pixel_value = bitmap.buffer[i * bitmap.pitch + j];if (pixel_value > 0){cv::Point draw_point(x + face->glyph->bitmap_left + j, y - face->glyph->bitmap_top + i);if (draw_point.x >= 0 && draw_point.x < image.cols && draw_point.y >= 0 && draw_point.y < image.rows){image.at<cv::Vec3b>(draw_point)[0] = cv::saturate_cast<uchar>(textColor[0] * (pixel_value / 255.0));image.at<cv::Vec3b>(draw_point)[1] = cv::saturate_cast<uchar>(textColor[1] * (pixel_value / 255.0));image.at<cv::Vec3b>(draw_point)[2] = cv::saturate_cast<uchar>(textColor[2] * (pixel_value / 255.0));}}}}x += face->glyph->advance.x >> 6;}FT_Done_Face(face);FT_Done_FreeType(library);cv::putText(image, "This is English", cv::Point(50, 50), cv::FONT_HERSHEY_SIMPLEX, 1.0, cv::Scalar(255, 255, 255));cv::imshow("Image with Text", image);cv::waitKey(0);cv::destroyAllWindows();return 0;
}