//相邻点遍历
private BmpPoint GetPoint(BmpPoint point,int i)
{
switch (i)
{
case 0: return new BmpPoint(point.x - 1, point.y - 1);
case 1: return new BmpPoint(point.x , point.y - 1);
case 2: return new BmpPoint(point.x + 1, point.y - 1);
case 3: return new BmpPoint(point.x + 1, point.y );
case 4: return new BmpPoint(point.x + 1, point.y + 1);
case 5: return new BmpPoint(point.x , point.y + 1);
case 6: return new BmpPoint(point.x - 1, point.y + 1);
case 7: return new BmpPoint(point.x - 1, point.y );
default:return point;
}
}
public void ImgInit(Image img, ref Bitmap bmp)
{
bmpWidth = img.Width;
bmpHeight = img.Height;
bmpHeight = resizePixel * bmpHeight / bmpWidth;
bmpWidth = resizePixel;
if (bmpHeight > resizePixel)
{
bmpWidth = resizePixel * bmpWidth / bmpHeight;
bmpHeight = resizePixel;
}
isBlack = new bool[bmpWidth, bmpHeight];
bmp = new Bitmap(img, bmpWidth, bmpHeight);
for (int i = 0; i <= 255; i++)
{
greynessIndex[i] = new List<BmpPoint>();
edgePointIndex[i] = new List<BmpPoint>();
}
originBmp = new Bitmap(bmp);
for (int i = 0; i <= bmpWidth - 1; i++)
for (int j = 0; j <= bmpHeight - 1; j++)
{
//灰度索引初始化
Color currColor = bmp.GetPixel(i, j);
int greyness = currColor.R + currColor.G + currColor.B;
BmpPoint currPoint = new BmpPoint(i,j);
greynessIndex[greyness / 3].Add(currPoint);
bmp.SetPixel(i, j, Color.White);
//边缘索引初始化
if (i == 0 || i == bmpWidth - 1 || j == 0 || j == bmpHeight - 1)
{
for (int k = greyness / 3; k <= 255; k++) edgePointIndex[k].Add(currPoint);
continue;
}
int newGreyness;
currColor = originBmp.GetPixel(i - 1, j);
newGreyness = currColor.R + currColor.G + currColor.B;
currColor = originBmp.GetPixel(i + 1, j);
newGreyness = Math.Max(newGreyness, currColor.R + currColor.G + currColor.B);
currColor = originBmp.GetPixel(i, j - 1);
newGreyness = Math.Max(newGreyness, currColor.R + currColor.G + currColor.B);
currColor = originBmp.GetPixel(i, j + 1);
newGreyness = Math.Max(newGreyness, currColor.R + currColor.G + currColor.B);
for (int k = greyness / 3 + 1; k <= newGreyness / 3; k++) edgePointIndex[k].Add(currPoint);
}
oldThresh = 0;
whiteBmp = new Bitmap(bmp);
}
