Halcon实战记录之一《划分图像区域为中心，四边，四角》

在做图像处理的时候，我们有时候对图像的不同区域的处理方式不一样，我这里写下我最近使用的方法，将一副图像分成三个区域–中心，四边，四角，如下图:



边的最小宽度和高度占图像的比例为Ratio，例如Rato等于0.1，即中心占图像的0.8的比例。

1、获取中心区域：

void GetImageRegion_Center (HObject *ho_Region, HTuple hv_imWidth, HTuple hv_imHeight, HTuple hv_Ratio)
{
GenRectangle1(&(*ho_Region), hv_imHeight*hv_Ratio, hv_imWidth*hv_Ratio, (hv_imHeight*(1-hv_Ratio))-1, (hv_imWidth*(1-hv_Ratio))-1);
}

2、获取四边区域：

void GetImageRegion_Side (HObject *ho_Region, HTuple hv_imWidth, HTuple hv_imHeight, HTuple hv_Ratio)
{
// Local iconic variables
HObject  ho_Rectangle_top, ho_Rectangle_bot, ho_Rectangle_lft;
HObject  ho_Rectangle_rgt, ho_ObjectsConcat;
//top
GenRectangle1(&ho_Rectangle_top, 0, hv_imWidth*hv_Ratio, (hv_imHeight*hv_Ratio)-1, (hv_imWidth*(1-hv_Ratio))-1);
//bottom
GenRectangle1(&ho_Rectangle_bot, hv_imHeight*(1-hv_Ratio),hv_imWidth*hv_Ratio, hv_imHeight-1, (hv_imWidth*(1-hv_Ratio))-1);
//left
GenRectangle1(&ho_Rectangle_lft, hv_imHeight*hv_Ratio, 0, (hv_imHeight*(1-hv_Ratio))-1, (hv_imWidth*hv_Ratio)-1);
//right
GenRectangle1(&ho_Rectangle_rgt, hv_imHeight*hv_Ratio, hv_imWidth*(1-hv_Ratio), (hv_imHeight*(1-hv_Ratio))-1, hv_imWidth-1);
ConcatObj(ho_Rectangle_top, ho_Rectangle_bot, &ho_ObjectsConcat);
ConcatObj(ho_ObjectsConcat, ho_Rectangle_lft, &ho_ObjectsConcat);
ConcatObj(ho_ObjectsConcat, ho_Rectangle_rgt, &ho_ObjectsConcat);
Union1(ho_ObjectsConcat, &(*ho_Region));
}

3、获取四角区域：

void GetImageRegion_Corner (HObject *ho_Region, HTuple hv_imWidth, HTuple hv_imHeight, HTuple hv_Ratio)
{
// Local iconic variables
HObject  ho_Rectangle_lt, ho_Rectangle_lb, ho_Rectangle_rt;
HObject  ho_Rectangle_rb, ho_ObjectsConcat;
//left top
GenRectangle1(&ho_Rectangle_lt, 0, 0, (hv_imHeight*hv_Ratio)-1, (hv_imWidth*hv_Ratio)-1);
//left bottom
GenRectangle1(&ho_Rectangle_lb, hv_imHeight*(1-hv_Ratio), 0, hv_imHeight-1, (hv_imWidth*hv_Ratio)-1);
//right top
GenRectangle1(&ho_Rectangle_rt, 0, hv_imWidth*(1-hv_Ratio), (hv_imHeight*hv_Ratio)-1, hv_imWidth-1);
//right bottom
GenRectangle1(&ho_Rectangle_rb, hv_imHeight*(1-hv_Ratio), hv_imWidth*(1-hv_Ratio), hv_imHeight-1, hv_imWidth-1);

ConcatObj(ho_Rectangle_lt, ho_Rectangle_lb, &ho_ObjectsConcat);
ConcatObj(ho_ObjectsConcat, ho_Rectangle_rt, &ho_ObjectsConcat);
ConcatObj(ho_ObjectsConcat, ho_Rectangle_rb, &ho_ObjectsConcat);
Union1(ho_ObjectsConcat, &(*ho_Region));
}

注意：四边和四角的区域各有四个，返回的是联合区域。