Tracker (OpenCV 4.9.0 Java documentation)

java.lang.Object
- org.opencv.video.Tracker

Direct Known Subclasses:

TrackerCSRT, TrackerDaSiamRPN, TrackerGOTURN, TrackerKCF, TrackerMIL, TrackerNano, TrackerVit
```
public class Tracker
extends java.lang.Object
```
Base abstract class for the long-term tracker

Field Summary

Fields
Modifier and Type Field Description

protected long nativeObj

Constructor Summary

Constructors
Modifier Constructor Description

protected Tracker(long addr)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Tracker`	`__fromPtr__(long addr)`
`protected void`	`finalize()`
`long`	`getNativeObjAddr()`
`void`	`init(Mat image, Rect boundingBox)`	Initialize the tracker with a known bounding box that surrounded the target
`boolean`	`update(Mat image, Rect boundingBox)`	Update the tracker, find the new most likely bounding box for the target

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

- Field Detail
  - nativeObj
```
protected final long nativeObj
```
- Constructor Detail
  - Tracker
```
protected Tracker(long addr)
```
- Method Detail
  - getNativeObjAddr
```
public long getNativeObjAddr()
```
  - __fromPtr__
```
public static Tracker __fromPtr__(long addr)
```
  - init
```
public void init(Mat image,
                 Rect boundingBox)
```
    Initialize the tracker with a known bounding box that surrounded the target
    
    Parameters:
    
    image - The initial frame
    
    boundingBox - The initial bounding box
  - update
```
public boolean update(Mat image,
                      Rect boundingBox)
```
    Update the tracker, find the new most likely bounding box for the target
    
    Parameters:
    
    image - The current frame
    
    boundingBox - The bounding box that represent the new target location, if true was returned, not modified otherwise
    
    Returns:
    
    True means that target was located and false means that tracker cannot locate target in current frame. Note, that latter *does not* imply that tracker has failed, maybe target is indeed missing from the frame (say, out of sight)
  - finalize
```
protected void finalize()
                 throws java.lang.Throwable
```
    Overrides:
    
    finalize in class java.lang.Object
    
    Throws:
    
    java.lang.Throwable