using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Metis.AutoAnalysis
{
    /// <summary>
    /// 检测图片是否是虚的
    /// </summary>
    class BlurDetection
    {
        private int m_threshold = 100;

        private double GetLaplacianVar(Mat src)
        {
            Mat dst = new Mat();
            Cv2.Laplacian(src, dst, MatType.CV_64F);

            Cv2.MeanStdDev(dst, out var mean, out var dev);

            return dev.Val0 * dev.Val0;
        }

        /// <summary>
        /// 检测图片是否是虚的
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns>true: 虚, false: 不虚</returns>
        public bool Detect(string fileName)
        {
            Mat mat = Cv2.ImRead(fileName, ImreadModes.Grayscale);

            var lap_var = GetLaplacianVar(mat);

            return lap_var < m_threshold;
        }
    }
}