SHJX_GM/SHJXCamera/Camera/NoiseDataFilter.cs

using System;
using System.Linq;
using System.Drawing;
using System.Collections.Generic;

namespace shjxCamera
{
    /// <summary>
    /// 将队列中的前后两幅图像像素点进行相减，最大的10%和最小的10%视为噪点，其余值进行平均值计算
    /// </summary>
    public class NoiseDataFilter
    {
        public NoiseDataFilter()
        {
            Count = 2;
            lstImages = new List<List<Color>>();
            NoiseCnt = 10;
        }

        #region fields

        /// <summary>
        /// 队列中保留图像数，默认为2
        /// </summary>
        public int Count { get; set; }

        /// <summary>
        /// 过滤噪点数，单向
        /// </summary>
        public int NoiseCnt { get; set; }

        /// <summary>
        /// 用于比较的图像像素队列
        /// </summary>
        protected List<List<Color>> lstImages { get; set; }

        #endregion

        #region methods

        /// <summary>
        /// 加入一幅图像到队列，不做处理
        /// </summary>
        /// <param name="newImage"></param>
        public void AddImage(List<Color> newImage)
        {
            lstImages.Add(newImage);
            while (lstImages.Count > this.Count)
            {
                lstImages.RemoveAt(0);
            }
        }

        /// <summary>
        /// 对图像进行噪点过滤，然后计算rgb总值
        /// </summary>
        /// <param name="newImage"></param>
        /// <param name="sumR"></param>
        /// <param name="sumG"></param>
        /// <param name="sumB"></param>
        public void CalcImage(List<Color> newImage, ref int sumR, ref int sumG, ref int sumB)
        {
            AddImage(newImage);
            CalcAvg(ref sumR, ref sumG, ref sumB);
        }

        /// <summary>
        /// 清除队列数据
        /// </summary>
        public void Clear()
        {
            if (lstImages != null)
            {
                lstImages.Clear();
            }
        }

        #endregion


        #region protected methods

        /// <summary>
        /// 计算后图减前图的过滤图的总值
        /// </summary>
        /// <param name="sumR"></param>
        /// <param name="sumG"></param>
        /// <param name="sumB"></param>
        protected void calcAvg1(ref int sumR, ref int sumG, ref int sumB)
        {
            if (lstImages == null)
            {
                throw new Exception("队列没有数据");
            }

            if (lstImages.Count >= 2)
            {
                // 计算滤噪后的总值
                List<Color> img1 = lstImages[lstImages.Count - 2]; // 上一幅
                List<Color> img2 = lstImages[lstImages.Count - 1]; // 当前幅

                #region 计算后图减前图的差值
                string strr = "R:\r\n", strg = "G:\r\n", strb = "B:\r\n";
                List<IntRGB> imgsub = new List<IntRGB>();
                IntRGB val;
                for (int i = 0; i < img2.Count; i++)
                {
                    val = new IntRGB(
                        img2[i].R - img1[i].R,
                        img2[i].G - img1[i].G,
                        img2[i].B - img1[i].B);
                    imgsub.Add(val);

                    /*if (this.IsLog)
                    {
                        strr = string.Format("{0}{1},", strr, val.R.ToString().PadLeft(3, ' '));
                        strg = string.Format("{0}{1},", strg, val.G.ToString().PadLeft(3, ' '));
                        strb = string.Format("{0}{1},", strb, val.B.ToString().PadLeft(3, ' '));
                        if (i % this.LogWidth == 11)
                        {
                            strr = string.Format("{0}\r\n", strr);
                            strg = string.Format("{0}\r\n", strg);
                            strb = string.Format("{0}\r\n", strb);
                        }
                    }*/
                }
                /*if (this.IsLog)
                {
                    //strr = string.Format("{0}\r\n", strr);
                    //strg = string.Format("{0}\r\n", strg);
                    //strb = string.Format("{0}\r\n", strb);

                    swLog.WriteLine("相减数据:");
                    swLog.WriteLine(strr);
                    swLog.WriteLine(strg);
                    swLog.WriteLine(strb);
                    swLog.WriteLine();
                }*/
                #endregion

                #region 统计差值，以G值为准
                Dictionary<int, int> dicimg = new Dictionary<int, int>();
                foreach (IntRGB subval in imgsub)
                {
                    if (dicimg.Keys.Contains(subval.G))
                    {
                        dicimg[subval.G] += 1;
                    }
                    else
                    {
                        dicimg.Add(subval.G, 1);
                    }
                }
                List<KeyValuePair<int, int>> lstsub = dicimg.OrderByDescending(c => c.Key).ToList();
                #endregion

                #region 计算阈值参数
                NoiseParam npm = new NoiseParam(NoiseCnt);
                npm.Threhold = img2.Count / 10;
                int tmp = 0; // 计算上阈值
                for (int i = 0; i < lstsub.Count; i++)
                {
                    tmp += lstsub[i].Value;
                    if (tmp < npm.Threhold)
                    {
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + lstsub[i].Value.ToString() + "点]"); }
                        continue; // 未够数，继续下一组
                    }
                    else if (tmp == npm.Threhold)
                    {
                        // 正好够数，记录阈值，退出循环
                        npm.Upper = lstsub[i].Key;
                        npm.UpCnt = lstsub[i].Value; // 该阈值需消除的点数
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + npm.UpCnt.ToString() + "点]"); }
                        break;
                    }
                    else
                    {
                        // 过数，计算阈值，退出循环
                        npm.Upper = lstsub[i].Key;
                        npm.UpCnt = lstsub[i].Value - (tmp - npm.Threhold);
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + npm.UpCnt.ToString() + "点]"); }
                        break;
                    }
                }
                tmp = 0; // 计算下阈值
                for (int i = lstsub.Count - 1; i >= 0; i--)
                {
                    tmp += lstsub[i].Value;
                    if (tmp < npm.Threhold)
                    {
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + lstsub[i].Value.ToString() + "点]"); }
                        continue; // 未够数，继续下一组
                    }
                    else if (tmp == npm.Threhold)
                    {
                        // 正好够数，记录阈值，退出循环
                        npm.Lower = lstsub[i].Key;
                        npm.LowCnt = lstsub[i].Value; // 该阈值需消除的点数
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + npm.LowCnt.ToString() + "点]"); }
                        break;
                    }
                    else
                    {
                        // 过数，计算阈值，退出循环
                        npm.Lower = lstsub[i].Key;
                        npm.LowCnt = lstsub[i].Value - (tmp - npm.Threhold);
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + npm.LowCnt.ToString() + "点]"); }
                        break;
                    }
                }
                #endregion

                #region 滤除噪点后，计算总值
                for (int i = 0; i < img2.Count; i++)
                {
                    if (imgsub[i].G > npm.Upper || imgsub[i].G < npm.Lower)
                    {
                        continue; // 噪点，滤去
                    }
                    else if (imgsub[i].G == npm.Upper && npm.UpCnt > 0)
                    {
                        // 部分噪点，滤去部分
                        npm.UpCnt--;
                        continue;
                    }
                    else if (imgsub[i].G == npm.Lower && npm.LowCnt > 0)
                    {
                        // 部分噪点，滤去部分
                        npm.LowCnt--;
                        continue;
                    }
                    else
                    {
                        // 非噪点，计算总值
                        sumR += img2[i].R;
                        sumG += img2[i].G;
                        sumB += img2[i].B;
                    }
                }
                /*if (this.IsLog)
                {
                    tmp = img2.Count - npm.Threhold * 2;
                    strr = string.Format("总值：(R, G, B)({0}, {1}, {2}) 数据个数：{3}", sumR, sumG, sumB, tmp);
                    swLog.WriteLine(strr);
                    strr = string.Format("均值：(R, G, B)({0}, {1}, {2})\r\n", (sumR * 1.0 / tmp).ToString("F2"), (sumG * 1.0 / tmp).ToString("F2"), (sumB * 1.0 / tmp).ToString("F2"));
                    swLog.WriteLine(strr);
                    swLog.WriteLine();
                }*/

                #endregion
            }
            else
            {
                #region 仅一图，无法去噪，直接计算总值
                List<Color> img2 = lstImages[lstImages.Count - 1]; // 上一幅
                for (int i = 0; i < img2.Count; i++)
                {
                    sumR += img2[i].R;
                    sumG += img2[i].G;
                    sumB += img2[i].B;
                }
                /*if (this.IsLog)
                {
                    int tmp = img2.Count;
                    string strr = string.Format("总值：(R, G, B)({0}, {1}, {2}) 数据个数：{3}", sumR, sumG, sumB, tmp);
                    swLog.WriteLine(strr);
                    strr = string.Format("均值：(R, G, B)({0}, {1}, {2})\r\n", (sumR * 1.0 / tmp).ToString("F2"), (sumG * 1.0 / tmp).ToString("F2"), (sumB * 1.0 / tmp).ToString("F2"));
                    swLog.WriteLine(strr);
                    swLog.WriteLine();
                }*/
                #endregion
            }
        }

        /// <summary>
        /// 计算后图减前图的过滤图的总值
        /// </summary>
        /// <param name="sumR"></param>
        /// <param name="sumG"></param>
        /// <param name="sumB"></param>
        protected void CalcAvg(ref int sumR, ref int sumG, ref int sumB)
        {
            if (lstImages == null)
            {
                throw new Exception("队列没有数据");
            }

            if (lstImages.Count >= 2)
            {
                // 计算滤噪后的总值
                List<Color> img1 = lstImages[lstImages.Count - 2]; // 上一幅
                List<Color> img2 = lstImages[lstImages.Count - 1]; // 当前幅

                #region 计算后图减前图的差值
                string strr = "R:\r\n", strg = "G:\r\n", strb = "B:\r\n";
                List<IntRGB> imgsub = new List<IntRGB>();
                IntRGB val;
                for (int i = 0; i < img2.Count; i++)
                {
                    val = new IntRGB(
                        img2[i].R - img1[i].R,
                        img2[i].G - img1[i].G,
                        img2[i].B - img1[i].B);
                    imgsub.Add(val);

                    /*if (this.IsLog)
                    {
                        strr = string.Format("{0}{1},", strr, val.R.ToString().PadLeft(3, ' '));
                        strg = string.Format("{0}{1},", strg, val.G.ToString().PadLeft(3, ' '));
                        strb = string.Format("{0}{1},", strb, val.B.ToString().PadLeft(3, ' '));
                        if (i % this.LogWidth == LogWidth - 1)
                        {
                            strr = string.Format("{0}\r\n", strr);
                            strg = string.Format("{0}\r\n", strg);
                            strb = string.Format("{0}\r\n", strb);
                        }
                    }*/
                }
                /*if (this.IsLog)
                {
                    //strr = string.Format("{0}\r\n", strr);
                    //strg = string.Format("{0}\r\n", strg);
                    //strb = string.Format("{0}\r\n", strb);

                    swLog.WriteLine("相减数据:");
                    swLog.WriteLine(strr);
                    swLog.WriteLine(strg);
                    swLog.WriteLine(strb);
                    swLog.WriteLine();
                }*/
                #endregion

                #region 统计差值，以G值为准
                Dictionary<int, int> dicimg = new Dictionary<int, int>();
                foreach (IntRGB subval in imgsub)
                {
                    if (dicimg.Keys.Contains(subval.G))
                    {
                        dicimg[subval.G] += 1;
                    }
                    else
                    {
                        dicimg.Add(subval.G, 1);
                    }
                }
                List<KeyValuePair<int, int>> lstsub = dicimg.OrderByDescending(c => c.Key).ToList();
                #endregion

                #region 计算阈值参数
                NoiseParam npm = new NoiseParam(NoiseCnt);
                npm.Threhold = img2.Count / 10;
                int tmp = 0; // 计算上阈值
                for (int i = 0; i < lstsub.Count; i++)
                {
                    tmp += lstsub[i].Value;
                    if (tmp < npm.Threhold)
                    {
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + lstsub[i].Value.ToString() + "点]"); }
                        continue; // 未够数，继续下一组
                    }
                    else if (tmp == npm.Threhold)
                    {
                        // 正好够数，记录阈值，退出循环
                        npm.Upper = lstsub[i].Key;
                        npm.UpCnt = lstsub[i].Value; // 该阈值需消除的点数
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + npm.UpCnt.ToString() + "点]"); }
                        break;
                    }
                    else
                    {
                        // 过数，计算阈值，退出循环
                        npm.Upper = lstsub[i].Key;
                        npm.UpCnt = lstsub[i].Value - (tmp - npm.Threhold);
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点+：" + lstsub[i].Key.ToString() + "[" + npm.UpCnt.ToString() + "点]"); }
                        break;
                    }
                }
                tmp = 0; // 计算下阈值
                for (int i = lstsub.Count - 1; i >= 0; i--)
                {
                    tmp += lstsub[i].Value;
                    if (tmp < npm.Threhold)
                    {
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + lstsub[i].Value.ToString() + "点]"); }
                        continue; // 未够数，继续下一组
                    }
                    else if (tmp == npm.Threhold)
                    {
                        // 正好够数，记录阈值，退出循环
                        npm.Lower = lstsub[i].Key;
                        npm.LowCnt = lstsub[i].Value; // 该阈值需消除的点数
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + npm.LowCnt.ToString() + "点]"); }
                        break;
                    }
                    else
                    {
                        // 过数，计算阈值，退出循环
                        npm.Lower = lstsub[i].Key;
                        npm.LowCnt = lstsub[i].Value - (tmp - npm.Threhold);
                        //if (this.IsLog) { swLog.WriteLine("滤除噪点-：" + lstsub[i].Key.ToString() + "[" + npm.LowCnt.ToString() + "点]"); }
                        break;
                    }
                }
                #endregion

                #region 滤除噪点后，计算总值
                double tmpR = 0.0, tmpG = 0.0, tmpB = 0.0;
                double tmpu = (dicimg[npm.Upper] - npm.UpCnt) * 1.0 / dicimg[npm.Upper]; // 部分过滤点保留的比率
                /*if (this.IsLog)
                {
                    swLog.WriteLine(string.Format("噪点+：{0}[{1}/{2}]={3}", npm.Upper.ToString(), npm.UpCnt, dicimg[npm.Upper], tmpu.ToString("F2")));
                }*/
                double tmpd = (dicimg[npm.Lower] - npm.LowCnt) * 1.0 / dicimg[npm.Lower]; // 部分过滤点保留的比率
               /* if (this.IsLog)
                {
                    swLog.WriteLine( string.Format("噪点-：{0}[{1}/{2}]={3}", npm.Lower.ToString(), npm.LowCnt, dicimg[npm.Lower], tmpd.ToString("F2")));
                }*/
                for (int i = 0; i < img2.Count; i++)
                {
                    if (imgsub[i].G > npm.Upper || imgsub[i].G < npm.Lower)
                    {
                        continue; // 噪点，滤去
                    }
                    else if (imgsub[i].G == npm.Upper && npm.UpCnt > 0)
                    {
                        // 部分噪点，滤去部分
                        tmpR += img2[i].R * tmpu;
                        tmpG += img2[i].G * tmpu;
                        tmpB += img2[i].B * tmpu;
                        continue;
                    }
                    else if (imgsub[i].G == npm.Lower && npm.LowCnt > 0)
                    {
                        // 部分噪点，滤去部分
                        tmpR += img2[i].R * tmpd;
                        tmpG += img2[i].G * tmpd;
                        tmpB += img2[i].B * tmpd;
                        continue;
                    }
                    else
                    {
                        // 非噪点，计算总值
                        tmpR += img2[i].R;
                        tmpG += img2[i].G;
                        tmpB += img2[i].B;
                    }
                }
                sumR = Convert.ToInt32(tmpR);
                sumG = Convert.ToInt32(tmpG);
                sumB = Convert.ToInt32(tmpB);
                /*if (this.IsLog)
                {
                    tmp = img2.Count - npm.Threhold * 2;
                    strr = string.Format("处理总值：(R, G, B)({0}, {1}, {2}), 数据个数：{3}, ", sumR, sumG, sumB, tmp)
                        + string.Format("均值：(R, G, B)({0}, {1}, {2})", (sumR * 1.0 / tmp).ToString("F2"), (sumG * 1.0 / tmp).ToString("F2"), (sumB * 1.0 / tmp).ToString("F2"));
                    swLog.WriteLine(strr);
                    //this.swLog.WriteLine();
                }*/

                #endregion
            }
            else
            {
                #region 仅一图，无法去噪，直接计算总值
                List<Color> img2 = lstImages[lstImages.Count - 1]; // 上一幅
                for (int i = 0; i < img2.Count; i++)
                {
                    sumR += img2[i].R;
                    sumG += img2[i].G;
                    sumB += img2[i].B;
                }
                /* if (this.IsLog)
                 {
                     int tmp = img2.Count;
                     string strr = string.Format("处理总值：(R, G, B)({0}, {1}, {2}), 数据个数：{3}, ", sumR, sumG, sumB, tmp)
                         + string.Format("均值：(R, G, B)({0}, {1}, {2})", (sumR * 1.0 / tmp).ToString("F2"), (sumG * 1.0 / tmp).ToString("F2"), (sumB * 1.0 / tmp).ToString("F2"));
                     swLog.WriteLine(strr);
                     //this.swLog.WriteLine();
                 }*/
                #endregion
            }
        }

        #endregion
    }


    /// <summary>
    /// 用int类型保存RGB三个值
    /// </summary>
    public class IntRGB
    {
        #region properties
        public int R { get; set; }
        public int G { get; set; }
        public int B { get; set; }
        #endregion

        public IntRGB()
        {
            R = 0;
            G = 0;
            B = 0;
        }

        public IntRGB(int r, int g, int b)
        {
            R = r;
            G = g;
            B = b;
        }
    }

    /// <summary>
    /// 噪点相关参数
    /// </summary>
    public class NoiseParam
    {
        /// <summary>
        /// 前后两图相减法，去除上下噪点
        /// </summary>
        /// <param name="threhold">上下各自噪点数</param>
        public NoiseParam(int threhold)
        {
            Threhold = threhold;
            Upper = 0;
            UpCnt = 0;
            Lower = 0;
            LowCnt = 0;
        }


        #region

        /// <summary>
        /// 噪点个数
        /// </summary>
        public int Threhold { get; set; }

        /// <summary>
        /// 噪点上阈值
        /// </summary>
        public int Upper { get; set; }
        /// <summary>
        /// 上阈值噪点数个数
        /// </summary>
        public int UpCnt { get; set; }

        /// <summary>
        /// 噪点下阈值
        /// </summary>
        public int Lower { get; set; }
        /// <summary>
        /// 下阈值噪点个数
        /// </summary>
        public int LowCnt { get; set; }

        #endregion
    }
}