Read image from Amazon S3 directly to MAT with AWS SDK for C++? [closed]

asked 2016-02-12 19:50:43 -0500

cuongvt101 gravatar image

Does anyone have experience with this AWS SDK for C++?

So for example, I have this image:

How can I read this image directly to MAT without saving it to disk using AWS SDK for C++?

Any help would be greatly appreciated!

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Closed for the following reason the question is answered, right answer was accepted by sturkmen
close date 2020-10-07 12:51:44.483037


if there's an aws sdk, why not use it ?

if not, you want one of those

berak gravatar imageberak ( 2016-02-13 00:05:02 -0500 )edit

Hi Berak, I am trying to use aws sdk actually. My question is how? Thanks

cuongvt101 gravatar imagecuongvt101 ( 2016-02-13 00:13:49 -0500 )edit

sorry, can't help with that ;(

but once you have the bytes in memory, you can construct a cv::Mat easily like

Mat m = cv::imdecode(buffer, IMREAD_COLOR);
berak gravatar imageberak ( 2016-02-13 00:21:07 -0500 )edit

Thanks Berak anyway. I'm reading the documentation of AWS SDK to read to buffer but has now luck so far.

cuongvt101 gravatar imagecuongvt101 ( 2016-02-13 00:24:20 -0500 )edit

Hi, Cuongvt101. I wrote an article for using OpenCV and AWS SDK for C++.[email protected]/items...

This is the snippet.

    std::stringstream ss;
    ss << getObjectOutcome.GetResult().GetBody().rdbuf();
    std::string str = ss.str();
    std::vector<char> vec(str.begin(), str.end());
    cv::Mat img = cv::imdecode(cv::Mat(vec), CV_LOAD_IMAGE_COLOR);
d9magai gravatar imaged9magai ( 2016-08-09 06:07:04 -0500 )edit

Didn't check back this question for a while. Thanks a lot d9magai for your help

cuongvt101 gravatar imagecuongvt101 ( 2016-09-16 14:44:47 -0500 )edit