OpenCvSharp PCA异常:不支持输入和输出数组格式的组合
本文关键字:数组 输出 格式 组合 输入 PCA 异常 不支持 OpenCvSharp | 更新日期: 2023-09-27 18:17:15
我使用OpenCVSharp (OpenCvSharp3-AnyCPU版本3.0.0.20150823在Visual Studio 2015中运行并通过NuGet安装)从c#访问OpenCV,但是当调用Cv2.PCACompute
时,我得到一个通用的OpenCVException声明我有一个不支持的输入和输出数组格式组合。
我的目标是使用PCA来找到像素blob的主轴。这是我目前的代码:
using OpenCvSharp;
public struct point2D
{
public int X;
public int Y;
public point2D(int X, int Y)
{
this.X = X;
this.Y = Y;
}
}
public static void PCA2D()
{
int height = 5;
int width = 5;
int[] image = new int[]
{
0,0,0,0,1,
0,0,0,1,0,
0,0,1,0,0,
0,1,0,0,0,
1,0,0,0,0,
}
// extract the datapoints
List<point2D> dataPoints = new List<point2D>();
for (int row = 0; row < height; ++row)
{
for (int col = 0; col < width; ++col)
{
if (image[row * width + col] == 1)
{
dataPoints.Add(new point2D(col, row));
}
}
}
// create the input matrix
Mat input = new Mat(dataPoints.Length, 2, MatType.CV_32SC1);
for (int i = 0; i < dataPoints.Length; ++i)
{
input.Set(i, 0, dataPoints[i].X);
input.Set(i, 1, dataPoints[i].Y);
}
Mat mean = new Mat();
Mat eigenvectors = new Mat();
// OpenCVException occurs here: unsupported combination of input and output array formats
Cv2.PCACompute(input, mean, eigenvectors);
// Code to get orientation from the eigenvectors
}
我还没能找到关于如何初始化均值和特征向量垫的任何文档,或者如果我调用pcaccompute的方式是正确的。对使用pcaccomputer的正确步骤有一些深入的了解将会非常有帮助。
所以dataPoints
不可能是MatType.CV_32SC1
。将代码更改为以下代码允许它工作:
// create the input matrix
Mat input = new Mat(dataPoints.Length, 2, MatType.CV_32FC1);
for (int i = 0; i < dataPoints.Length; ++i)
{
input.Set(i, 0, (float)dataPoints[i].X);
input.Set(i, 1, (float)dataPoints[i].Y);
}