private void FormHistEqual_Load(object sender, EventArgs e)
{
// 原灰階圖
pictureBox1.Image = pcxGray.pcxImg;
// 繪製原灰階圖直方圖
// 清除圖表資料
chart1.Series.Clear();
// 設定圖表的高度與圖片相同
chart1.Size = new Size(chart1.Width, pictureBox1.Image.Height);
// 繪製histogram
Bitmap target = pcxGray.pcxImg.Clone(new Rectangle(0, 0, pcxGray.pcxImg.Width, pcxGray.pcxImg.Height), PixelFormat.Format24bppRgb);
int w = target.Width;
int h = target.Height;
Array.Clear(yValue1, 0, yValue1.Length);
for (int x = 0; x < w; ++x)
{
for (int y = 0; y < h; ++y)
{
Color c = target.GetPixel(x, y);
int r = c.R;
int g = c.G;
int b = c.B;
++yValue1[r];
++yValue1[g];
++yValue1[b];
}
}
// 保存轉換成頻率前的統計結果
Array.Copy(yValue1, hist, yValue1.Length);
// 將點個數轉換為頻率
int total = w * h * 3;
for (int i = 0; i < 256; ++i)
{
yValue1[i] /= total;
}
// 設定x軸區間
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 32;
// Intensities - 強度
chart1.Series.Add("Intensities"); // 資料序列集合
chart1.Series["Intensities"].ChartType = SeriesChartType.Column; // 直方圖
chart1.Series["Intensities"].Points.DataBindXY(xValue, yValue1);
// 保存原始縱軸最大值
originYMax = chart1.ChartAreas["ChartArea1"].AxisY.Maximum;
// Histogram Equalization
pcxAfter = new ImgPcx(pcxGray);
pcxAfter.HistEqual(hist);
pictureBox2.Image = pcxAfter.pcxImg;
// 顯示SNR值 (到小數後2位)
textBox1.Text = pcxGray.GetSNR(pcxGray, pcxAfter).ToString("f2");
// 繪製Histogram Equalization後的直方圖
chart2.Series.Clear();
chart2.Size = chart1.Size;
target = pcxAfter.pcxImg.Clone(new Rectangle(0, 0, pcxAfter.pcxImg.Width, pcxAfter.pcxImg.Height), PixelFormat.Format24bppRgb);
Array.Clear(yValue2, 0, yValue2.Length);
for (int x = 0; x < w; ++x)
{
for (int y = 0; y < h; ++y)
{
Color c = target.GetPixel(x, y);
int r = c.R;
int g = c.G;
int b = c.B;
++yValue2[r];
++yValue2[g];
++yValue2[b];
}
}
// 將點個數轉換為頻率
for (int i = 0; i < 256; ++i)
{
yValue2[i] /= total;
}
// 設定x軸區間
chart2.ChartAreas["ChartArea1"].AxisX.Interval = 32;
// Intensities - 強度
chart2.Series.Add("Intensities"); // 資料序列集合
chart2.Series["Intensities"].ChartType = SeriesChartType.Column; // 直方圖
chart2.Series["Intensities"].Points.DataBindXY(xValue, yValue2);
}
