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procedure BitmapErose(Bitmap: TBitmap; bHoric: Boolean);
//传入的Bitmap是一个二值位图，bHoric标志是水平方向还是竖直方向腐蚀
var
X, Y: integer;
newbmp: TBitmap;
P, Q, R, O: pByteArray;
begin
newbmp := TBitmap.Create;
//动态创建位图
newbmp.Assign(bitmap);
if (bHoric) then
begin
for Y := 1 to newbmp.Height - 2 do
begin
O := bitmap.ScanLine[Y];
P := newbmp.ScanLine[Y - 1];
Q := newbmp.ScanLine[Y];
R := newbmp.ScanLine[Y + 1];
for X := 1 to newbmp.Width - 2 do
begin
if ((O[3 * X] = 0) and (O[3 * X + 1] = 0) and (O[3 * X + 2]= 0)) then
begin
// 判断黑点左右邻居是否有白色点,有则腐蚀,置该点为白色
// 白色点则保持不变
if (((Q[3 * (X - 1)] = 255) and (Q[3 * (X - 1) + 1] = 255) and (Q[3 * (X - 1) + 2] = 255))
or ((Q[3 * (X + 1)] = 255) and (Q[3 * (X + 1) + 1] = 255) and (Q[3 * (X + 1) + 2] = 255))
or ((P[3 * X] = 0) and (P[3 * X + 1] = 255) and (P[3 * X + 2] = 255))
or ((R[3 * X] = 255) and (R[3 * X + 1] = 255) and (R[3 * X + 2] = 255))) then
begin
O[3 * X] := 255;
O[3 * X + 1] := 255;
O[3 * X + 2] := 255;
// 将满足条件的黑色点置为白色
end;
end;
end;
end;
end else begin
for Y := 1 to newbmp.Height - 2 do
begin
O := bitmap.ScanLine[Y];
Q := newbmp.ScanLine[Y];
for X := 1 to newbmp.Width - 2 do
begin
// 判断一个黑点上下邻居是否有白点,有则腐蚀,置黑点为白色
// 白色点就保持不变
if ((O[3 * X] = 0) and (O[3 * X + 1] = 0) and (O[3 * X + 2]= 0)) then
begin
if (((Q[3 * (X - 1)] = 255) and (Q[3 * (X - 1) + 1] = 255) and (Q[3 * (X - 1) + 2] = 255))
or ((Q[3 * (X + 1)] = 255) and (Q[3 * (X + 1) + 1] = 255) and (Q[3 * (X + 1) + 2] = 255))) then
begin
O[3 * X] := 255;
O[3 * X + 1] := 255;
O[3 * X + 2] := 255;
// 将满足条件的黑色点置为白色
end;
end;
end;
end;
end;
end;
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