初始提交：龙芯2K0300智能车卖家Demo完整代码

2026-05-28 15:24:33 +08:00
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+/*
+ * @Author: ilikara 3435193369@qq.com
+ * @Date: 2025-01-07 06:55:37
+ * @LastEditors: ilikara 3435193369@qq.com
+ * @LastEditTime: 2025-01-07 08:10:54
+ * @FilePath: /smartcar/opencv_demo1/opencv_demo1.cpp
+ * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
+ */
+#include <opencv2/opencv.hpp>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <linux/fb.h>
+#include <sys/ioctl.h>
+#include <chrono>
+#include <iomanip>
+#include <sstream>
+
+using namespace cv;
+using namespace std;
+
+// 将 RGB888 转换为 RGB565
+ushort rgb888_to_rgb565(const Vec3b &color)
+{
+    return ((color[2] >> 3) << 11) | ((color[1] >> 2) << 5) | (color[0] >> 3);
+}
+
+// 获取当前时间字符串
+string getCurrentTime()
+{
+    auto now = chrono::system_clock::now();
+    auto now_time_t = chrono::system_clock::to_time_t(now);
+    auto now_tm = *localtime(&now_time_t);
+
+    stringstream ss;
+    ss << put_time(&now_tm, "%Y-%m-%d %H:%M:%S");
+    return ss.str();
+}
+
+int main()
+{
+    // 打开 USB 摄像头
+    VideoCapture cap(0); // 0 表示默认摄像头
+    if (!cap.isOpened())
+    {
+        cerr << "Error: Cannot open camera" << endl;
+        return -1;
+    }
+
+    // 设置摄像头分辨率（可选）
+    cap.set(CAP_PROP_FRAME_WIDTH, 320);
+    cap.set(CAP_PROP_FRAME_HEIGHT, 240);
+
+    // Framebuffer 设备
+    const char *fb_device = "/dev/fb0";
+    int fb_fd = open(fb_device, O_RDWR);
+    if (fb_fd == -1)
+    {
+        cerr << "Error: Cannot open framebuffer device" << endl;
+        return -1;
+    }
+
+    // 获取 Framebuffer 信息
+    struct fb_var_screeninfo vinfo;
+    if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &vinfo))
+    {
+        cerr << "Error: Cannot get framebuffer information" << endl;
+        close(fb_fd);
+        return -1;
+    }
+
+    // 检查 Framebuffer 是否支持 RGB565
+    if (vinfo.bits_per_pixel != 16)
+    {
+        cerr << "Error: Framebuffer is not RGB565 format" << endl;
+        close(fb_fd);
+        return -1;
+    }
+
+    // 映射 Framebuffer 到内存
+    size_t fb_size = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
+    ushort *fb_data = (ushort *)mmap(0, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
+    if (fb_data == MAP_FAILED)
+    {
+        cerr << "Error: Failed to map framebuffer to memory" << endl;
+        close(fb_fd);
+        return -1;
+    }
+
+    // 主循环
+    Mat frame, resizedFrame;
+    int frameCount = 0;
+    while (true)
+    {
+        // 从摄像头捕获一帧图像
+        cap >> frame;
+        if (frame.empty())
+        {
+            cerr << "Error: Captured frame is empty" << endl;
+            break;
+        }
+
+        // 调整图像大小为 160x128
+        resize(frame, resizedFrame, Size(160, 128));
+
+        // 获取当前时间和帧数
+        string timeStr = getCurrentTime();
+        string frameStr = "Frame: " + to_string(frameCount);
+
+        // 在图像左上角绘制黑色边框的白色文字
+        int fontFace = FONT_HERSHEY_SIMPLEX;
+        double fontScale = 0.4;
+        int thickness = 1;
+        int baseline = 0;
+
+        // 计算文字位置
+        Point timePos(5, 15);  // 时间文字位置
+        Point framePos(5, 30); // 帧数文字位置
+
+        // 绘制黑色边框
+        putText(resizedFrame, timeStr, timePos + Point(-1, -1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, timeStr, timePos + Point(1, -1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, timeStr, timePos + Point(-1, 1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, timeStr, timePos + Point(1, 1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+
+        putText(resizedFrame, frameStr, framePos + Point(-1, -1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, frameStr, framePos + Point(1, -1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, frameStr, framePos + Point(-1, 1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+        putText(resizedFrame, frameStr, framePos + Point(1, 1), fontFace, fontScale, Scalar(0, 0, 0), thickness + 1);
+
+        // 绘制白色文字
+        putText(resizedFrame, timeStr, timePos, fontFace, fontScale, Scalar(255, 255, 255), thickness);
+        putText(resizedFrame, frameStr, framePos, fontFace, fontScale, Scalar(255, 255, 255), thickness);
+
+        // 将图像数据写入 Framebuffer
+        for (int y = 0; y < resizedFrame.rows; y++)
+        {
+            for (int x = 0; x < resizedFrame.cols; x++)
+            {
+                Vec3b color = resizedFrame.at<Vec3b>(y, x);
+                fb_data[y * vinfo.xres + x] = rgb888_to_rgb565(color);
+            }
+        }
+
+        // 更新帧数
+        frameCount++;
+
+        // 等待一段时间（例如 30ms）
+        usleep(30000);
+    }
+
+    // 释放资源
+    munmap(fb_data, fb_size);
+    close(fb_fd);
+    cap.release();
+
+    return 0;
+}