opencvsharp 分块并行计算找直线边编写函数，参数从白到黑 从左到右

以下是一个基于 OpenCVSharp 的分块并行计算找直线边的函数：

public static void FindEdges(Mat image, int numBlocks, int threshold, bool horizontal, out List<int> edgePositions)
{
    // Calculate block size
    int blockSize = image.Height / numBlocks;

    // Initialize list to store edge positions
    edgePositions = new List<int>();

    // Loop through each block
    Parallel.For(0, numBlocks, i =>
    {
        // Calculate block boundaries
        int startY = i * blockSize;
        int endY = startY + blockSize;
        if (i == numBlocks - 1)
            endY = image.Height;

        // Initialize variables for edge detection
        int prevPixel = 0;
        int pixelDiff = 0;
        bool foundEdge = false;

        // Loop through each pixel in the block
        for (int y = startY; y < endY; y++)
        {
            int startX = horizontal ? 0 : y;
            int endX = horizontal ? image.Width : y + 1;

            for (int x = startX; x < endX; x++)
            {
                // Get the pixel value
                int pixelValue = (int)image.At<byte>(y, x);

                // Calculate the difference between the current pixel and the previous pixel
                pixelDiff = pixelValue - prevPixel;

                // Check if the difference exceeds the threshold, and if so, mark the edge and add it to the list
                if (!foundEdge && pixelDiff > threshold)
                {
                    foundEdge = true;
                    edgePositions.Add(horizontal ? x : y);
                }

                // Update the previous pixel value
                prevPixel = pixelValue;
            }
        }
    });

    // Sort the edge positions in ascending order
    edgePositions.Sort();
}

该函数接受一个二进制图像 `image`，将其分成 `numBlocks` 个块，然后在每个块中查找直线边（水平或垂直），并将找到的边界位置存储在 `edgePositions` 列表中。

参数 `threshold` 用于指定像素值之间的最小差异，以便将其视为直线边。参数 `horizontal` 用于指定是否查找水平直线边。如果为 `true`，则查找水平直线边，否则查找垂直直线边。

请注意，该函数使用了 OpenCVSharp 库。如果您还没有安装该库，请先安装它。