ThresholdFilterTask.cs - master - Kirill_Zavyalov/My-Cod

ThresholdFilterTask.cs
58 строк2 KB
Kirill_Zavyalov
update ThresholdFilterTask.cs
26 дек 2025, 22:35
26 дек 2025, 22:3521ad563
using System;
using System.Collections.Generic;

namespace Recognizer;

public static class ThresholdFilterTask
{
    public static double[,] ThresholdFilter(double[,] original, double whitePixelsFraction)
    {
        var numberOfPixels = original.Length;
        var minWhitePixels = (int)Math.Floor(whitePixelsFraction * numberOfPixels);
        var countLines = original.GetLength(0);
        var countColumns = original.GetLength(1);

        var list = CreateListForThreshold(original);
        var threshold = FindThreshold(list, minWhitePixels);
        var thresholdArray = PaintInBlackWhite(threshold, countLines, countColumns, original);

        return thresholdArray;
    }

    public static List<double> CreateListForThreshold(double[,] original)
    {
        var list = new List<double>();
        foreach (var e in original)
            list.Add(e);
        list.Sort();
        list.Reverse();
        return list;
    }

    public static double FindThreshold(List<double> array, int minWhitePixels)
    {
        var indexThreshold = minWhitePixels - 1;
        var threshold = -1.0;
        if (indexThreshold >= 0)
            threshold = array[indexThreshold];
        return threshold;
    }

    public static double[,] PaintInBlackWhite(double threshold, int countLines, int countColumns, double[,] original)
    {
        var thresholdArray = new double[countLines, countColumns];
        for (var i = 0; i < countLines; i++)
        {
            for (var j = 0; j < countColumns; j++)
            {
                if (threshold < 0)
                    thresholdArray[i, j] = 0.0;
                else if (original[i, j] >= threshold)
                    thresholdArray[i, j] = 1.0;
                else
                    thresholdArray[i, j] = 0.0;
            }
        }
        return thresholdArray;
    }
}