Opencv学习笔记(五)关于cv::Point2d cv::Point2f cv:Point2i cv::Point2l cv::Point3d cv::Point3f cv::Point3i的见解
opencv
OpenCV: 开源计算机视觉库
项目地址:https://gitcode.com/gh_mirrors/opencv31/opencv
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在opencv中该模板类涵盖几乎所有表示点的数据类型
可以看到,该模板类有众多的具体化形式
那么,这些类型中的数字(1,2,3),字母(i,f,d)都是什么意思呢?
在此,记录一下
数字(1,2,3)代表的是这个点的维度信息,字母(i,f,d,l)代表该点的类型,整形、浮点型、双精度、long (例如,long int 长整形)
1代表1维,该点仅有X轴即可确定
2代表2维,该点需要X、Y两轴来确定,
3代表3维,需要由X,Y,Z三个轴来确定
例如:我要创建四个二维矩阵中的浮点型的点,那么我要指定点的类型为f
cv::Point2f srcQuad[] = {
cv::Point2f(0, 0), // src Top left
cv::Point2f(src.cols-1, 0), // src Top right
cv::Point2f(src.cols-1, src.rows-1), // src Bottom right
cv::Point2f(0, src.rows-1) // src Bottom left
};
这里,我用四个点定位了一个图像矩阵。
其它情况可以依次类推,这里就不依次描述了
原文链接:https://blog.csdn.net/az9996/article/details/90573002
OpenCV: 开源计算机视觉库
最近提交(Master分支:3 个月前 )
748d6545
videoio(ios): fix NSInvalidArgumentException in VideoWriter release #28173
Summary
Fixes a crash on iOS when calling `VideoWriter::release()` in OpenCV 4.12.0.
Issue
Fixes #28165
Detailed Description
This PR resolves a regression where an `NSInvalidArgumentException` was thrown with the message ` -[NSAutoreleasePool retain]: Cannot retain an autorelease pool`.
The crash was caused by the manual usage of `NSAutoreleasePool` in the `~CvVideoWriter_AVFoundation` destructor. The local pool variable was being captured by the completion handler block passed to `[mMovieWriter finishWritingWithCompletionHandler:]`. Since `NSAutoreleasePool` instances cannot be retained, capturing them in a block causes a crash.
Changes:
- Replaced manual `NSAutoreleasePool` allocation and draining with modern `@autoreleasepool` blocks in `CvVideoWriter_AVFoundation`.
- applied this modernization to the Constructor, Destructor, and `write` methods.
- Specifically in the destructor, an inner `@autoreleasepool` is now used inside the completion block, ensuring no pool object needs to be captured from the outer scope. 21 小时前
c5d70a7f
Iterative Phase Correlation #28146
### Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake
2 天前
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