角点检测算子的代码描述

最简单的一种角点检测算子，但是由于采用了非最大化抑制，效果和OpenCV相当。

TPointInfo = record
Info: TPoint;
w: extended;
Color: TLabColor;
end;

TSinglePointInfoArray = array of TPointInfo;

procedure CornerDetect(Width, Height: longint);
var
i, j, fi, fj, sum: longint;
begin
PointCount := 0;
for i := 7 to Width - 8 do
for j := 7 to Height - 8 do begin
sum := 0;
for fi := i - 7 to i 7 do
for fj := j - 7 to j 7 do
sum := sum abs(ImageGray[i, j] - ImageGray[fi, fj]);
ImagePoint[i, j] := sum div $100;
end;
{标准角点检测算子部分}
for i := 7 to Width - 8 do
for j := 7 to Height - 8 do begin
sum := ImagePoint[i, j];
if sum > $20 then begin
WBPoint[i, j] := true;
Inc(PointCount);
for fi := i - 7 to i 7 do begin
for fj := j - 7 to j 7 do
if ImagePoint[fi, fj] > sum then begin
WBPoint[i, j] := false;
Dec(PointCount);
break;
end;
if not WBPoint[i, j] then break;
end;
end else
WBPoint[i, j] := false;
end;
{用非最大化抑制来抑制假角点}
setlength(CornerPoint, PointCount); fi := 0;
for i := 7 to Width - 8 do
for j := 7 to Height - 8 do
if WBPoint[i, j] then begin
CornerPoint[fi].Info.X := i;
CornerPoint[fi].Info.Y := j;
Inc(fi);
end;
{输出为一个点序列}
end;

输入的ImageGray为图像的灰度描述，WBPoint为Boolean数组，ImagePoint为标准角点检测算子运行后的检测值。

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