UMat和OpenCV中的Mat有什么区别? [英] What is the difference between UMat and Mat in OpenCV?

问题描述

我已经阅读了文档，但没有获得有关UMat的清晰详细描述；但是我认为它与GPU和CPU有关.请帮帮我. 谢谢.

I have been through the documentation and didn't get a clear detailed description about UMat; however I think it has something to relate with GPU and CPU. Please help me out. Thank you.

推荐答案

本文档的第3节可能会有所帮助:[现在断开链接] https://software.intel.com/sites /default/files/managed/2f/19/inde_opencv_3.0_arch_guide.pdf

Perhaps section 3 of this document will help: [link now broken] https://software.intel.com/sites/default/files/managed/2f/19/inde_opencv_3.0_arch_guide.pdf

具体来说，第3.1节:

Specifically, section 3.1:

一个统一的抽象cv :: UMat，它可以使用CPU或OpenCL代码实现相同的API，而无需显式调用OpenCL加速版本.如果系统中存在这些功能，则使用启用了OpenCL的GPU，否则将自动切换到CPU操作.

A unified abstraction cv::UMat that enables the same APIs to be implemented using CPU or OpenCL code, without a requirement to call OpenCL accelerated version explicitly. These functions use an OpenCL-enabled GPU if exists in the system, and automatically switch to CPU operation otherwise.

和第3.3节:

通常，cv :: UMat是C ++类，与cv :: Mat非常相似.但是实际的UMat数据可以位于常规系统内存，专用视频内存或共享内存中.

Generally, the cv::UMat is the C++ class, which is very similar to cv::Mat. But the actual UMat data can be located in a regular system memory, dedicated video memory, or shared memory.

链接到 @BourbonCreams 的注释中建议的用法:
https://docs.opencv.org/3.0-rc1/db /dfa/tutorial_transition_guide.html#tutorial_transition_hints_opencl

Link to usage suggested in the comments by @BourbonCreams:
https://docs.opencv.org/3.0-rc1/db/dfa/tutorial_transition_guide.html#tutorial_transition_hints_opencl

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