在OpenCV Java中声明Mat [英] declare Mat in OpenCV java

问题描述

如何使用Java OpenCV创建和分配Mat? 此页面的C ++版本是

How can I create and assign a Mat with Java OpenCV? The C++ version from this page is

Mat C = (Mat_<double>(3,3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);

Java OpenCV中的等效内容是什么?似乎缺少Java OpenCV的文档.确实存在的内容通常包含在Java中不起作用的C ++代码.

What would be the equivalent in Java OpenCV? It seems that the documentation for Java OpenCV is lacking. What does exist often contains C++ code that doesn't work in Java.

推荐答案

是.该文档很少或不存在.等效为

Yes. The documentation is minimal or non existing. An equivalent would be

Mat img = new Mat( 3, 3, CvType.CV_64FC1 );
int row = 0, col = 0;
img.put(row ,col, 0, -1, 0, -1, 5, -1, 0, -1, 0 );

在Opencv Java文档中( 1 )用于Mat类，请参见重载的put方法

In opencv java doc(1) for Mat class, see the overloaded put method

public int put(int row, int col, double... data )
public int put(int row, int col, float[] data )
public int put(int row, int col, int[] data )
public int put(int row, int col, short[] data )
public int put(int row, int col, byte[] data )

我们可以看到，对于double以外的数据类型，最后一个参数是数组，而不是变量参数类型.因此，如果选择创建不同类型的Mat，我们将需要使用以下数组

We can see that for data types other than double, the last parameter is an array and not variable argument type. So if choosing to create Mat of different type, we will need to use arrays as below

int row = 0, col = 0;
int data[] = {  0, -1, 0, -1, 5, -1, 0, -1, 0 };
//allocate Mat before calling put
Mat img = new Mat( 3, 3, CvType.CV_32S );
img.put( row, col, data );

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