opencvsharp 编写canny高精度亚像素从左到右找边函数,指定找边方向FindSubPixelEdge
时间: 2023-07-30 11:10:04 浏览: 74
用OpenCV写的采用Canny算法进行边缘检测的程序.zip
以下是使用 OpenCvSharp 编写的 Canny 高精度亚像素从左到右找边函数,可指定找边方向:
```csharp
using OpenCvSharp;
public static Point2f FindSubPixelEdge(Mat image, Point2f startPoint, float directionX, float directionY)
{
const int iterations = 10;
const float stepSize = 0.1f;
Point2f point = startPoint;
for (int i = 0; i < iterations; i++)
{
// Compute the gradient at the current point
float gradientX = (float)image.Get<double>((int)point.Y, (int)point.X + 1) - (float)image.Get<double>((int)point.Y, (int)point.X - 1);
float gradientY = (float)image.Get<double>((int)point.Y + 1, (int)point.X) - (float)image.Get<double>((int)point.Y - 1, (int)point.X);
// Normalize the gradient
float magnitude = (float)Math.Sqrt(gradientX * gradientX + gradientY * gradientY);
gradientX /= magnitude;
gradientY /= magnitude;
// Compute the step direction
float stepX = gradientY * directionY - gradientX * directionX;
float stepY = gradientX * directionX + gradientY * directionY;
// Perform the step
point.X += stepSize * stepX;
point.Y += stepSize * stepY;
}
return point;
}
```
该函数接受以下参数:
- `image`:输入图像。
- `startPoint`:起始点,即从哪个点开始找边。
- `directionX` 和 `directionY`:指定找边方向的向量。例如,如果你想要从左到右找边,则 `directionX = 1`,`directionY = 0`。如果你想要从上到下找边,则 `directionX = 0`,`directionY = 1`。
该函数返回一个 `Point2f` 类型的点,表示找到的亚像素级别的边缘点的位置。
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