// 數值變動時
private void textBox1_TextChanged(object sender, EventArgs e)
{
int value;
if (int.TryParse(textBox1.Text, out value))
{
if (value > 255)
{
textBox1.Text = "255";
value = 255;
}
else if (value < 0)
{
textBox1.Text = "0";
value = 0;
}
trackBar1.Value = value;
pcxAfter = new ImgPcx(pcxGray);
pcxAfter.Threshold(value);
pictureBox2.Image = pcxAfter.pcxImg;
// 顯示SNR值 (到小數後2位)
textBox2.Text = pcxGray.GetSNR(pcxGray, pcxAfter).ToString("f2");
}
}
// 移動拉桿時
private void trackBar1_ValueChanged(object sender, EventArgs e)
{
int value = trackBar1.Value;
textBox1.Text = value.ToString();
pcxAfter = new ImgPcx(pcxGray);
pcxAfter.Threshold(value);
pictureBox2.Image = pcxAfter.pcxImg;
// 顯示SNR值 (到小數後2位)
textBox2.Text = pcxGray.GetSNR(pcxGray, pcxAfter).ToString("f2");
// 清除圖表資料
chart1.Series.Clear();
chart1.ChartAreas["ChartArea1"].AxisX.StripLines.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 origin = (Bitmap)pictureBox2.Image;
Bitmap target = origin.Clone(new Rectangle(0, 0, origin.Width, origin.Height), PixelFormat.Format24bppRgb);
int w = target.Width;
int h = target.Height;
double[] yValue1 = new double[256];
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];
}
}
// 將點個數轉換為頻率
int total = w * h * 3;
for (int i = 0; i < 256; ++i)
{
yValue1[i] /= total;
}
// Range(start, cnt)
string[] xValue = Enumerable.Range(0, 256).ToArray().Select(x => x.ToString()).ToArray();
// 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.ChartAreas["ChartArea1"].AxisY.Maximum = 1;
chart1.ChartAreas["ChartArea1"].AxisY.Minimum = 0;
chart1.Series["Intensities"].Points.DataBindXY(xValue, yValue1);
chart1.Series["Intensities"].Color = Color.Blue;
// 畫出threshold
StripLine stripline = new StripLine();
stripline.Interval = 0;
stripline.IntervalOffset = value;
stripline.StripWidth = 1;
stripline.BackColor = Color.Red;
chart1.ChartAreas["ChartArea1"].AxisX.StripLines.Add(stripline);
}
