if (sOption == L"histogram")
    {
        const int pixNum = m_imgW * m_imgH;

        if (pixNum == 0)
        {
            __debugbreak();
            return;
        }

        int histogram[256] = { 0 };
        for (int x = 0; x < m_imgW; x++)
        {
            for (int y = 0; y < m_imgH; y++)
            {
                histogram[GetPixel(x, y)] += 1;
            }
        }

        float probabilities[256] = { 0.0f };
        for (int i = 0; i < 256; i++)
        {
            probabilities[i] = (float)histogram[i] / (float)pixNum;
        }

        int sum = 0;
        for (int i = 0; i < 256; i++)
        {
            sum += histogram[i];
        }


        float transform[256] = { 0.0f };
        for (int i = 0; i < 256; i++)
        {
            for (int j = 0; j <= i; j++)
            {
                transform[i] += probabilities[j];
            }
        }

        for (int x = 0; x < m_imgW; x++)
        {
            for (int y = 0; y < m_imgH; y++)
            {
                BYTE j = GetPixel(x, y);
                int value = transform[j] * 255.0f;
                SetPixel(x, y, value);
            }
        }
    }