better-genshin-impact/BetterGenshinImpact/Core/Recognition/OpenCv/ContoursHelper.cs

using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

namespace BetterGenshinImpact.Core.Recognition.OpenCv;

public class ContoursHelper
{
    /// <summary>
    /// 找到指定颜色的矩形
    /// </summary>
    /// <param name="srcMat">图像</param>
    /// <param name="low">RGB色彩低位</param>
    /// <param name="high">RGB色彩高位</param>
    /// <param name="minWidth">矩形最小宽度</param>
    /// <param name="minHeight">矩形最小高度</param>
    /// <returns></returns>
    public static List<Rect> FindSpecifyColorRects(Mat srcMat, Scalar low, Scalar high, int minWidth = -1, int minHeight = -1)
    {
        try
        {
            using var src = srcMat.Clone();
            Cv2.CvtColor(src, src, ColorConversionCodes.BGR2RGB);
            Cv2.InRange(src, low, high, src);

            Cv2.FindContours(src, out var contours, out _, RetrievalModes.External,
                ContourApproximationModes.ApproxSimple);
            if (contours.Length > 0)
            {
                var boxes = contours.Select(Cv2.BoundingRect).Where(r =>
                {
                    if (minWidth > 0 && r.Width < minWidth)
                    {
                        return false;
                    }
                    if (minHeight > 0 && r.Height < minHeight)
                    {
                        return false;
                    }
                    return true;
                });
                return boxes.ToList();
            }
        }
        catch (Exception e)
        {
            Debug.WriteLine(e);
        }

        return [];
    }

    public static List<Rect> FindSpecifyColorRects(Mat srcMat, Scalar color, int minWidth = -1, int minHeight = -1)
    {
        return FindSpecifyColorRects(srcMat, color, color, minWidth, minHeight);
    }
}