彩色图像的分割处理程序设计+Hough算法(18)
{
cp.Entries[i] = Color.FromArgb(i, i, i);
}
houghImage.Palette = cp;
Rectangle rectHough = new Rectangle(0, 0, 180, 180);
System.Drawing.Imaging.BitmapData houghData = houghImage.LockBits(rectHough,
System.Drawing.Imaging.ImageLockMode.ReadWrite, houghImage.PixelFormat);
IntPtr ptr = houghData.Scan0;
int bytes = 180 * 180;
byte[] grayHough = new byte[bytes];
for (int i = 0; i < 180; i++)
{
for (int j = 0; j < 180; j++)
{
grayHough[i * 180 + j] = Convert.ToByte(houghMap[i, j] * 255 /
maxHough);
}
}
System.Runtime.InteropServices.Marshal.Copy(grayHough, 0, ptr, bytes);
houghImage.UnlockBits(houghData);
Graphics g = e.Graphics;
g.DrawImage(houghImage, 40, 20, 180, 180);
g.FillRectangle(Brushes.Black, 250, 20, 180, 180);
double thresholding = maxHough * 0.6;
double k, b;
int x1, x2, y1, y2;
for (int i = 0; i < 180; i++)
{
for (int j = 0; j < 180; j++)
{
if (houghMap[i, j] > thresholding)
{
if (i == 90)
{
g.DrawLine(Pens.White, 250, 200, 250, 20);