我使用的是OpenCV api for java。我试图使用MatOfPoint3f元素。
我发现您可以初始化并插入所需的所有数据但只需一次。
插入一些数据后,我想添加新数据或修改元素。
我该怎么做?
我必须尝试它,但是当我使用类MatOfPoint3f的.fromArray()或.fromList()方法插入新数据时,已经插入的数据被清除,只有新数据保留在那里。 / p>
我有这段代码
int i = 2;
int j = 4;
double k = 0.0;
Point3[] point = new Point3[2];
point[0] = new Point3(i, j, k);
point[1] = new Point3(2*i, 2*j, 2*k);
System.out.println("Point3: "+point);
MatOfPoint3f objectCorners;
objectCorners = new MatOfPoint3f(point[0]);
System.out.println("1-objectCorners"+objectCorners.toList());
objectCorners.fromArray(point);
System.out.println("2-objectCorners:"+objectCorners);
objectCorners.fromArray(point[1]);
System.out.println("3-objectCorners"+objectCorners.toList());
我在控制台中得到了这个结果:
Point3: [Lorg.opencv.core.Point3;@5e222e
1-objectCorners[{2.0, 4.0, 0.0}]
2-objectCorners:Mat [ 2*1*CV_32FC3, isCont=true, isSubmat=false, nativeObj=0x539a320, dataAddr=0x539e310 ]
3-objectCorners[{4.0, 8.0, 0.0}]
答案 0 :(得分:0)
对于迟到的回答感到抱歉,但仍然可以帮助某人。 我使用方法put()与double [],它工作。 我将y从4.0修改为5.0。
java.util.List<Point3> pointsList = new ArrayList<Point3>();
MatOfPoint3f pointsMat = new MatOfPoint3f();
int i = 2;
int j = 4;
double k = 0.0;
Point3[] point = new Point3[2];
point[0] = new Point3(i, j, k);
point[1] = new Point3(2*i, 2*j, 2*k);
pointsList.add(point[0]);
pointsList.add(point[1]);
// MatOfPoint3f from List
pointsMat.fromList(pointsList);
// Index of element to change
int elementIndex = 0;
System.out.println("Before modifying");
Point3 readedPoint = pointsMat.toList().get(elementIndex);
System.out.println(readedPoint);
// Modify a point
point[elementIndex].y = 5.0; // Changing y to 5.0 for example
double[] modified = {point[elementIndex].x, point[elementIndex].y, point[elementIndex].z};
pointsMat.put(0, elementIndex, modified);
System.out.println("After modifying");
readedPoint = pointsMat.toList().get(elementIndex);
System.out.println(readedPoint);
控制台输出:
Before modifying
{2.0, 4.0, 0.0}
After modifying
{2.0, 5.0, 0.0}