opencv创建图片,绘制图片,画框,划线,改变像素点颜色

文章目录

• 创建空白图片
• 创建一张渐变色彩色
• 绘制多边形
• 绘制多线
• 改变像素点颜色

创建空白图片

bool tool_class::creatEmpty(int width, int height, std::string image_p)
{// 创建一个空白图像cv::Mat blankImage(height, width, CV_8UC3, cv::Scalar(255, 255, 255));// 保存图像为文件（可选）cv::imwrite(image_p.c_str(), blankImage);// 显示空白图像cv::imshow("Blank Image", blankImage);// 等待用户按下任意键后关闭窗口cv::waitKey(0);// 关闭窗口cv::destroyAllWindows();return true;
}

创建一张渐变色彩色

bool tool_class::creatColor(std::string image_p)
{// 指定图像的宽度和高度int width = 640;int height = 480;// 创建一个空白图像cv::Mat gradientImage(height, width, CV_8UC3);// 生成渐变色for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {// 计算RGB颜色值，根据x和y的位置生成渐变色uchar blue = static_cast<uchar>(x * 255 / width);uchar green = static_cast<uchar>((x + y) * 255 / (width + height));uchar red = static_cast<uchar>(y * 255 / height);// 设置像素颜色// 三通道:at<Vec3b>(row, col)// 单通道:at<uchar>(row, col)gradientImage.at<cv::Vec3b>(y, x) = cv::Vec3b(blue, green, red);}}// 保存图像为文件（可选）cv::imwrite(image_p.c_str(), gradientImage);// 显示渐变色图像cv::imshow("Gradient Image", gradientImage);// 等待用户按下任意键后关闭窗口cv::waitKey(0);// 关闭窗口cv::destroyAllWindows();return true;
}

绘制多边形

bool tool_class::drawPolygon(std::string image_p, std::vector<cv::Point> points)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar red = cv::Scalar(0, 0, 255);  // Red color  cv::Scalar blue = cv::Scalar(255, 0, 0);  // Red color  int thickness = 2;// 使用polylines函数给图片绘制多边形cv::polylines(ima, points, true, red, thickness, 8, 0);// 填充颜色cv::fillPoly(ima, std::vector<std::vector<cv::Point>>{points}, blue, 8, 0);// 显示图像  cv::imshow("Image with line", ima);// 绘制cv::imwrite(image_p.c_str(), ima);return true;
}

绘制多线

bool tool_class::drawLines(std::string image_p, std::vector<cv::Point> points)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar red = cv::Scalar(0, 0, 255);  // Red color  int thickness = 2;// 遍历点列表，绘制线段for (size_t i = 0; i < points.size() - 1; i++){cv::Point2f start = points[i];cv::Point2f end = points[i + 1];cv::line(ima, start, end, red, thickness);}cv::imwrite(image_p.c_str(), ima);return true;
}

改变像素点颜色

bool tool_class::changeColor(std::string image_p, int width, int height)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar Red = cv::Scalar(0, 0, 255);  // Red color  // 改变像素点的颜色ima.at<cv::Vec3b>(height, width)[0] = 0;ima.at<cv::Vec3b>(height, width)[1] = 0;ima.at<cv::Vec3b>(height, width)[2] = 255;// 或者//uchar blue = 0;//uchar green = 0;//uchar red = 255;//ima.at<cv::Vec3b>(height, width) = cv::Vec3b(blue, green, red);cv::imwrite(image_p.c_str(), ima);return true;}

opencv创建图片,绘制图片,画框,划线,改变像素点颜色

文章目录

• 创建空白图片
• 创建一张渐变色彩色
• 绘制多边形
• 绘制多线
• 改变像素点颜色

创建空白图片

bool tool_class::creatEmpty(int width, int height, std::string image_p)
{// 创建一个空白图像cv::Mat blankImage(height, width, CV_8UC3, cv::Scalar(255, 255, 255));// 保存图像为文件（可选）cv::imwrite(image_p.c_str(), blankImage);// 显示空白图像cv::imshow("Blank Image", blankImage);// 等待用户按下任意键后关闭窗口cv::waitKey(0);// 关闭窗口cv::destroyAllWindows();return true;
}

创建一张渐变色彩色

bool tool_class::creatColor(std::string image_p)
{// 指定图像的宽度和高度int width = 640;int height = 480;// 创建一个空白图像cv::Mat gradientImage(height, width, CV_8UC3);// 生成渐变色for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {// 计算RGB颜色值，根据x和y的位置生成渐变色uchar blue = static_cast<uchar>(x * 255 / width);uchar green = static_cast<uchar>((x + y) * 255 / (width + height));uchar red = static_cast<uchar>(y * 255 / height);// 设置像素颜色// 三通道:at<Vec3b>(row, col)// 单通道:at<uchar>(row, col)gradientImage.at<cv::Vec3b>(y, x) = cv::Vec3b(blue, green, red);}}// 保存图像为文件（可选）cv::imwrite(image_p.c_str(), gradientImage);// 显示渐变色图像cv::imshow("Gradient Image", gradientImage);// 等待用户按下任意键后关闭窗口cv::waitKey(0);// 关闭窗口cv::destroyAllWindows();return true;
}

绘制多边形

bool tool_class::drawPolygon(std::string image_p, std::vector<cv::Point> points)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar red = cv::Scalar(0, 0, 255);  // Red color  cv::Scalar blue = cv::Scalar(255, 0, 0);  // Red color  int thickness = 2;// 使用polylines函数给图片绘制多边形cv::polylines(ima, points, true, red, thickness, 8, 0);// 填充颜色cv::fillPoly(ima, std::vector<std::vector<cv::Point>>{points}, blue, 8, 0);// 显示图像  cv::imshow("Image with line", ima);// 绘制cv::imwrite(image_p.c_str(), ima);return true;
}

绘制多线

bool tool_class::drawLines(std::string image_p, std::vector<cv::Point> points)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar red = cv::Scalar(0, 0, 255);  // Red color  int thickness = 2;// 遍历点列表，绘制线段for (size_t i = 0; i < points.size() - 1; i++){cv::Point2f start = points[i];cv::Point2f end = points[i + 1];cv::line(ima, start, end, red, thickness);}cv::imwrite(image_p.c_str(), ima);return true;
}

改变像素点颜色

bool tool_class::changeColor(std::string image_p, int width, int height)
{cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar Red = cv::Scalar(0, 0, 255);  // Red color  // 改变像素点的颜色ima.at<cv::Vec3b>(height, width)[0] = 0;ima.at<cv::Vec3b>(height, width)[1] = 0;ima.at<cv::Vec3b>(height, width)[2] = 255;// 或者//uchar blue = 0;//uchar green = 0;//uchar red = 255;//ima.at<cv::Vec3b>(height, width) = cv::Vec3b(blue, green, red);cv::imwrite(image_p.c_str(), ima);return true;}