2.C#+OpenCV基础(一)_加载创建复制保存图片2024-07-10

1、加载

（1）加载彩图

/// <summary>
/// 加载图片
/// ImreadModes.AnyColor：任意图像
/// ImreadModes.Color：三通道
/// ImreadModes.Grayscale：灰度图
/// </summary>
/// <param name="imgPath">图片路径</param>
public static Mat LoadImg(string imgPath, ImreadModes mode = ImreadModes.AnyColor)
{
    return new Mat(imgPath, mode);
}

（2）加载灰度图

/// <summary>
/// 加载图片 - 灰度图片
/// </summary>
/// <param name="imgPath">图片路径</param>
public static Mat LoadImg_GRAY(string imgPath)
{
    return new Mat(imgPath, ImreadModes.Grayscale);
}

2、创建

（1）常见方式

Mat mat1 = new Mat();

Mat mat1 = new Mat(width, height, MatType.CV_8UC1);  // 宽,高,样式

（2）创建全零矩阵

 Mat mat2=Mat.Zeros(mat1.Size(), mat1.Type());

（3）创建全1矩阵

 Mat kernel = Mat.Ones(10, 10, MatType.CV_8UC1);

（4）创建一张纯色或雪花图片

/// <summary>
/// 创建一张图片
/// 纯色、随机雪花
/// </summary>
/// <param name="w">宽</param>
/// <param name="h">高</param>
/// <param name="isSolidColor">是否是纯色；true=纯色,false=随机雪花</param>
/// <param name="scalar">纯色时的颜色；Scalar.White 或Scalar.FromVec3b(new Vec3b() { Item0=0,Item1=0,Item2=0})</param>
/// <returns></returns>
public static Mat CreateImg(int width, int height, bool isSolidColor, Scalar scalar)
{
    if (isSolidColor)
    {
        Mat mat = new Mat(width, height, MatType.CV_8UC1, scalar);  // 
        return mat;
    }
    else
    {
        Mat mat = new Mat(width, height, MatType.CV_8UC1);  // 

        Random random = new Random();
        for (int i = 0; i < height; i++)
        {
            for (int j = 0; j < width; j++)
            {
                byte blue = (byte)(random.NextDouble() * 256);
                byte green = (byte)(random.NextDouble() * 256);
                byte red = (byte)(random.NextDouble() * 256);

                Vec3b color = new Vec3b(blue, green, red);

                mat.At<Vec3b>(i, j) = color;
            }
        }
        return mat;
    }
}

3、复制(深复制)

Mat dstMat = new Mat();
mat.CopyTo(dstMat);  // 图像mat深层复制给图像dstMat

4、保存

/// <summary>
/// 保存图片
/// </summary>
/// <param name="imgPath">图片路径</param>
public static bool SaveImg(Mat mat, string imgPath)
{
    return mat.SaveImage(imgPath);
}