如何在 BGR 图像的像素上绘制文本字符串,以便在显示时文本可读,c++?

How can I draw a string of text onto the pixels of a BGR image so that the text is readable when displayed, c++?

有没有一种简单的方法可以修改 72x72 像素 BGR 图像的像素,使其包含显示图像时可读的文本字符串。

基本上,我需要在下面创建的图像缓冲区 img 上绘制 str 中的文本,以便在显示图像时可以读取它。

unsigned char img[72*72*3]; // 72*72*3 BGR image buffer
unsigned char B = 0x00; 
unsigned char G = 0x00;
unsigned char R = 0x00;
std::string str = "Test Text";

// Create BGR image
for (int i = 0; i < (72*72*3); i += 3)
{
    img[i + 0] = B;
    img[i + 1] = G;
    img[i + 2] = R;
}

// Draw str on BGR image buffer?

我建议 CImg 这样:

#include <iostream>
#include <cstdlib>
#define cimg_display 0
#include "CImg.h"

using namespace cimg_library;
using namespace std;

int main() {
   // Create 72x72 RGB image
   CImg<unsigned char> image(72,72,1,3);

   // Fill with magenta
   cimg_forXY(image,x,y) {
      image(x,y,0,0)=255;
      image(x,y,0,1)=0;
      image(x,y,0,2)=255;
   }

   // Make some colours
   unsigned char cyan[]    = {0,   255, 255 };
   unsigned char black[]   = {0,   0,   0   };

   // Draw black text on cyan
   image.draw_text(3,20,"Test text",black,cyan,1,16);

   // Save result image as NetPBM PNM - no libraries required
   image.save_pnm("result.pnm");
}

它小巧、快速、功能全面、现代 C++ 和 "header only" 这意味着您不需要 link 对抗任何东西要么。