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java.lang.Object org.opencv.core.Algorithm
public class Algorithm
This is a base class for all more or less complex algorithms in OpenCV, especially for classes of algorithms, for which there can be multiple implementations. The examples are stereo correspondence (for which there are algorithms like block matching, semi-global block matching, graph-cut etc.), background subtraction (which can be done using mixture-of-gaussians models, codebook-based algorithm etc.), optical flow (block matching, Lucas-Kanade, Horn-Schunck etc.).
The class provides the following features for all derived classes:
Algorithm.create
). If you plan to add your own algorithms, it
is good practice to add a unique prefix to your algorithms to distinguish
them from other algorithms.
cvSetCaptureProperty()
, cvGetCaptureProperty()
,
VideoCapture.set()
and VideoCapture.get()
.
Algorithm
provides similar method where instead of integer id's
you specify the parameter names as text strings. See Algorithm.set
and Algorithm.get
for details.
Here is example of SIFT use in your application via Algorithm interface:
#include "opencv2/opencv.hpp"
// C++ code:
#include "opencv2/nonfree/nonfree.hpp"...
initModule_nonfree(); // to load SURF/SIFT etc.
Ptr sift = Algorithm.create("Feature2D.SIFT");
FileStorage fs("sift_params.xml", FileStorage.READ);
if(fs.isOpened()) // if we have file with parameters, read them
sift->read(fs["sift_params"]);
fs.release();
else // else modify the parameters and store them; user can later edit the
file to use different parameters
sift->set("contrastThreshold", 0.01f); // lower the contrast threshold,
compared to the default value
WriteStructContext ws(fs, "sift_params", CV_NODE_MAP);
sift->write(fs);
Mat image = imread("myimage.png", 0), descriptors;
vector keypoints;
(*sift)(image, noArray(), keypoints, descriptors);
- See Also:
- org.opencv.core.Algorithm
Method Summary
boolean
getBool(java.lang.String name)
double
getDouble(java.lang.String name)
int
getInt(java.lang.String name)
Mat
getMat(java.lang.String name)
java.util.List<Mat>
getMatVector(java.lang.String name)
java.lang.String
getString(java.lang.String name)
java.lang.String
paramHelp(java.lang.String name)
int
paramType(java.lang.String name)
void
setBool(java.lang.String name,
boolean value)
void
setDouble(java.lang.String name,
double value)
void
setInt(java.lang.String name,
int value)
void
setMat(java.lang.String name,
Mat value)
void
setMatVector(java.lang.String name,
java.util.List<Mat> value)
void
setString(java.lang.String name,
java.lang.String value)
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Method Detail
getBool
public boolean getBool(java.lang.String name)
getDouble
public double getDouble(java.lang.String name)
getInt
public int getInt(java.lang.String name)
getMat
public Mat getMat(java.lang.String name)
getMatVector
public java.util.List<Mat> getMatVector(java.lang.String name)
getString
public java.lang.String getString(java.lang.String name)
paramHelp
public java.lang.String paramHelp(java.lang.String name)
paramType
public int paramType(java.lang.String name)
setBool
public void setBool(java.lang.String name,
boolean value)
setDouble
public void setDouble(java.lang.String name,
double value)
setInt
public void setInt(java.lang.String name,
int value)
setMat
public void setMat(java.lang.String name,
Mat value)
setMatVector
public void setMatVector(java.lang.String name,
java.util.List<Mat> value)
setString
public void setString(java.lang.String name,
java.lang.String value)
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