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How to convert an OpenCV Mat that has been written in an xml file back into an image?


How to convert an OpenCV Mat that has been written in an xml file back into an image?

By : Petr Attritions Baye
Date : November 17 2020, 11:58 AM
I wish this help you you can convert it to matlab format within opencv.
read it in using the Filestorage:
code :
Mat m;
Filestorage fs("m.xml", Filestorage::READ);
fs["myMatrix"] >> m;
// 2.4 version
cerr << format(m,"MATLAB") << endl;
// 3.0 version
cerr << format(m,cv::Formatter::FMT_MATLAB) << endl;


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OpenCV Convert Image to Bytes and Back

OpenCV Convert Image to Bytes and Back


By : Anjelly Ashelly
Date : March 29 2020, 07:55 AM
hope this fix your issue I am trying to convert images to a vector of bytes and back again but each image is horrible distorted. I was hoping someone could tell me why. , I was playing around with my code and I got this to work.
code :
cv::Mat bytesToMat(vector<byte> bytes,int width,int height)
{
    cv::Mat image = cv::Mat(height,width,CV_8UC3,bytes.data()).clone(); // make a copy
    return image;
}
Only one third of image written in OpenCV

Only one third of image written in OpenCV


By : Usahrani Sathivheil
Date : March 29 2020, 07:55 AM
hop of those help? If you are just setting the array to a scalar, you can use either
out = Scalar(0.123, 0.123, 0.123); or
code :
out.at<cv::Vec3f>(j,i)[0] = 0.123;
out.at<cv::Vec3f>(j,i)[1] = 0.123;
out.at<cv::Vec3f>(j,i)[2] = 0.123;
How to convert OpenCV Mat to Halide Image and back?

How to convert OpenCV Mat to Halide Image and back?


By : user6014497
Date : March 29 2020, 07:55 AM
it should still fix some issue Yes, you can avoid copying data. I see two possible approaches: either allocate memory yourself and refer to that memory in both an OpenCV Mat instance and a Halide buffer_t structure; or let OpenCV's Mat class allocate the memory and refer to that memory in a buffer_t structure.
For the first approach, you can use a Mat constructor that takes a data pointer:
code :
float* data = new float[3 * width * height];
cv::Mat image(height, width, CV_32FC3, data, AUTO_STEP);
cv::Mat image(height, width, CV_32FC3);
buffer_t buffer;
memset(&buffer, 0, sizeof(buffer));
buffer.host = image.data;
buffer.elem_size = image.elemSize1();
buffer.extent[0] = image.cols;
buffer.extent[1] = image.rows;
buffer.extent[2] = image.channels();
buffer.stride[0] = image.step1(1);
buffer.stride[1] = image.step1(0);
buffer.stride[2] = 1;
How to convert edged image in OpenCV to svg file?

How to convert edged image in OpenCV to svg file?


By : Zuck Liker
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I assume you want just the contours to be saved as SVG image.
First, you need to compute the contours in your canny image using the findContorus function of OpenCV. Please be careful here, your contours MUST be well defined.
How to convert image file object to numpy array in with openCv python?

How to convert image file object to numpy array in with openCv python?


By : user3223036
Date : March 29 2020, 07:55 AM
wish helps you If you effectively have the contents of a JPEG/PNG file in your variable called response, I think you can do:
code :
frame = cv2.imdecode(response)
frame = cv2.imdecode(np.fromstring(response, np.uint8), cv2.IMREAD_COLOR)
from io import BytesIO
from scipy import misc

frame = misc.imread(BytesIO(response))
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