halcon模板匹配和旋转矫正

1.前言

1.1什么是模板匹配和旋转矫正

在常见的很多项目中，经常会使用手动绘制ROI的情况，但是实际产品的位置往往不是固定的，可能出现在视野上的各种地方和各种角度，所以就需要使用到旋转矫正。将产品放置在视野的中央，并且使得图像呈现出我们所需要的角度。

1.2halcon实现方式

先预先定义一个固定的带角度的矩形ROI，角度为我们所需要修正的角度的方向，然后进行生成和创建模板，然后匹配模板，并将匹配成功的横纵坐标与角度进行图像旋转即可

2.C#程序

2.1C#程序

#region // 模板匹配和旋转矫正(初始创建的ROI角度应该使用序列化参数进行保存)
/// 

/// 模板匹配和旋转矫正
/// 
/// 输入图像
/// 是否创建新模板
/// 输入矩形ROI的横坐标
/// 输入矩形ROI的列坐标
/// 输入矩形ROI的角度
/// 输入矩形ROI的一边长
/// 输入矩形ROI的一边宽
/// 输入模板存放的位置，文件后缀为.shm
/// 输出旋转后的图像
/// 
public static bool TemplateSpin(HObject image,bool NewTemplate,
            HTuple Row,HTuple Column,HTuple Phi,HTuple Length1,HTuple Length2,string ModelAddress,
            out HObject imageAffineTrans)
{
    HOperatorSet.GenEmptyObj(out imageAffineTrans);
    try
    {
        HTuple modelID = new HTuple();
        if (NewTemplate)
        {
            Module.CreatTemplate(image, Row, Column, Phi, Length1,Length2, 0.8, 1.2, out modelID);
            HOperatorSet.TupleLength(modelID, out HTuple length);
            if (length==0)
            {
                return false;
            }
            HOperatorSet.WriteShapeModel(modelID, ModelAddress);
        }
        else
        {
            if (!System.IO.File.Exists(ModelAddress))
            {
                return false;
            }
            HOperatorSet.ReadShapeModel(ModelAddress, out modelID);
        }
        Module.FindTemplate(image, modelID, 0.3, out HTuple resultRow, out HTuple resultCloumn, out HTuple resultAngle, out HTuple resultScore);
        HOperatorSet.TupleLength(resultRow, out HTuple length1);
        if (length1==0)
        {
            return false;
        }
        HOperatorSet.GetImageSize(image, out HTuple width, out HTuple height);
        HOperatorSet.VectorAngleToRigid(resultRow, resultCloumn, resultAngle+Phi, height/2, width/2 ,  0, out HTuple homMat2D);
        HOperatorSet.AffineTransImage(image, out imageAffineTrans, homMat2D, new HTuple("constant"), new HTuple("false"));
        return true;
    }
    catch (Exception)
    {
        return false;
    }
}

#endregion
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#region // 模板匹配

/// 

/// 查找模板
/// 
/// 输入图像
/// 输入模板
/// 输入最小匹配分数
/// 输出匹配中心的横坐标
/// 输出匹配中心列坐标
/// 输出匹配模型角度
/// 输出匹配分数
/// 匹配成功返回true，匹配失败返回false
static public bool FindTemplate(HObject Image, HTuple ModelID, HTuple MinScore, out HTuple ResultRow, out HTuple ResultCloumn,
            out HTuple ResultAngle, out HTuple ResultScore)
{
    ResultRow = -1;
    ResultCloumn = -1;
    ResultAngle = -1;
    ResultScore = -1;
    try
    {
        HOperatorSet.GetShapeModelParams(ModelID, out HTuple numLevels, out HTuple angleStart, out HTuple angleExtent,
           out HTuple angleStep, out HTuple scaleMin, out HTuple scaleMax, out HTuple scaleStep, out HTuple metric,
           out HTuple minContrast);
        HOperatorSet.FindScaledShapeModel(Image, ModelID, angleStart, angleExtent, scaleMin, scaleMax, MinScore, new HTuple(1),
                    new HTuple(0.5), new HTuple("least_squares"), numLevels, new HTuple(0.9), out ResultRow, out ResultCloumn,
                    out ResultAngle, out HTuple Scale, out ResultScore);
        HOperatorSet.TupleLength(ResultScore,out HTuple length);
        if (length > 0)
        {
            return true;
        }
        else { return false; }

    }
    catch (Exception ex)
    {
        return false;
    }

}

/// 

/// 创建模板
/// 
/// 输入图像
/// 矩形中心横坐标
/// 矩形中心列坐标
/// 矩形ROI角度
/// 矩形一条边的长
/// 矩形另一条边的长
/// 模板最小缩放比例
/// 模板最大缩放比例
/// 输出模板
/// 创建成功返回true，创建失败返回false
static public bool CreatTemplate(HObject Image, HTuple Row, HTuple Column, HTuple Phi,
            HTuple Length1, HTuple Length2, HTuple ScaledMin, HTuple SacledMax, out HTuple ModelID)
{
    ModelID = -1;
    try
    {
        HOperatorSet.GenRectangle2(out HObject ROI, Row, Column, Phi, Length1, Length2);
        HOperatorSet.ReduceDomain(Image, ROI, out HObject imageReduced);
        HOperatorSet.CreateScaledShapeModel(imageReduced, 8, (new HTuple(0)).TupleRad(), (new HTuple(360)).TupleRad(), new HTuple("auto"),
                ScaledMin, SacledMax, new HTuple("auto"), new HTuple("none"), new HTuple("ignore_global_polarity"), new HTuple("auto"),
                new HTuple("auto"), out ModelID);
        HOperatorSet.TupleLength(ModelID, out HTuple length);
        if (length==0)
        {
            return false;
        }
        return true;
    }
    catch (Exception ex)
    {
        return false;
    }


}
#endregion
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3.测试过程

4.总结

实际上模板匹配和旋转矫正时非常简单的事情。需要在旋转矫正时加上预先设定的ROI角度即可。