SubpixelEdgelDetection (ImgLib2 Javadocs 0-SNAPSHOT API)

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java.lang.Object
- net.imglib2.algorithm.edge.SubpixelEdgelDetection

```
public class SubpixelEdgelDetection
extends Object
```
Compute the set of sub-pixel edgels for the input image. A pixel contains an edgel if its gradient magnitude is a local maximum in the direction of the gradient (perpendicular to the edge). The sub-pixel position of the edgel is found as the maximum of a quadratic function fitted to the neighboring magnitudes in the gradient direction. The method is described in
F. Devernay, A Non-Maxima Suppression Method for Edge Detection with Sub-Pixel Accuracy , RR 2724, INRIA, nov. 1995

Author:

Tobias Pietzsch

Constructor Summary

Constructors
Constructor and Description

SubpixelEdgelDetection()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T extends RealType<T>> ArrayList<Edgel>`	`getEdgels(RandomAccessibleInterval<T> input, ImgFactory<T> factory, double minGradientMagnitude)` Compute the set of sub-pixel edgels for the input image.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SubpixelEdgelDetection
```
public SubpixelEdgelDetection()
```
- Method Detail
  - getEdgels
```
public static <T extends RealType<T>> ArrayList<Edgel> getEdgels(RandomAccessibleInterval<T> input,
                                                                 ImgFactory<T> factory,
                                                                 double minGradientMagnitude)
```
    Compute the set of sub-pixel edgels for the input image. A pixel contains an edgel if its gradient magnitude is a local maximum in the direction of the gradient (perpendicular to the edge). The sub-pixel position of the edgel is found as the maximum of a quadratic function fitted to the neighboring magnitudes in the gradient direction.
    Note: The input image type must be a signed type! Otherwise gradient computation will not work.
    
    Parameters:
    
    input - input image
    
    factory - used to create an image to store the partial derivatives of the input image
    
    minGradientMagnitude - Only consider a pixel an edgel if the gradient magnitude is greater than this
    
    Returns:
    
    set of edgels found in the input image

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