robro's profile - activity

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2018-10-13 12:08:53 -0600	commented question	Roi to small? :D Yes, i missed that! Thank you very much, problem solved ;-)
2018-10-13 11:50:59 -0600	asked a question	Roi to small? Roi to small? Hi, I am using ROIs to crop my images and I just noticed that the ROIs are always one pixel to small. Ac
2018-08-01 12:27:36 -0600	commented answer	Efficient calculation with multiple cv::Mat Thank you very much! This is exactly what I was looking for :-)
2018-08-01 12:27:18 -0600	commented answer	Efficient calculation with multiple cv::Mat Thank you very much!
2018-08-01 12:27:02 -0600	marked best answer	Efficient calculation with multiple cv::Mat Hello, I need to do some math with my matrices and I would like to know the most performant way. I have the following vectors: `std::vector<cv::Mat> b //200 matrices with 1 row and 1000 elements per row std::vector<cv::Mat> w //200 matrices with 1 row and 1000 elements per row std::vector <cv::Mat>image //200 matrices with 500 rows and 1000 elements per row` All vectors with the same index belong together. I need to calculate the following for every Mat of the vectors with the same index and every pixel in the image: `image(x, y) = (image(x,y) – b(x)) / (w(x) – b(x)) * 0,9` I would start like the following: `for(int i=0; i<image.size(); i++) { //And here? //Usage of the “at”-method or pointer arithmetic? //Or is there an operation which can calculate everything automatically line by line? }` Thank you very much :-)
2018-08-01 00:23:25 -0600	commented question	Efficient calculation with multiple cv::Mat Thanks for the idea! I just had another one. I could make the number of rows of "b" and "w" dynamically the same as imag
2018-07-31 15:33:44 -0600	asked a question	Efficient calculation with multiple cv::Mat Efficient calculation with multiple cv::Mat Hello, I need to do some math with my matrices and I would like to know the
2018-07-02 11:44:22 -0600	commented answer	Create a vector of Mat from a three dimensional vector Thanks! One last question... How can Mat's memory be consecutive if the end dimensions (rows, cols) are not known at the
2018-07-02 11:39:19 -0600	received badge	● Supporter (source)
2018-07-02 11:39:16 -0600	marked best answer	Create a vector of Mat from a three dimensional vector Hello, I have a vector of the type `std::vector< std::vector< std::vector <uint16_t> > >` and data is stored in the following order: `vector[col][channel][row]`. I would like to create a vector of the type `std::vector<cv::Mat>` in which a grayscale image of each channel is stored. Also, the Mat vector should point to the original data. The original vector changes dynamically as new columns are appended and so the Mat vector should grow as well. What is the best way to create, fill and extend the Mat vector? Thank you very much!
2018-07-02 11:39:16 -0600	received badge	● Scholar (source)
2018-07-02 11:12:23 -0600	commented question	Create a vector of Mat from a three dimensional vector Sorry, I was not clear enough. The original format is uchar* buffer for eyery image line. From this buffer I need to cas
2018-07-02 10:30:40 -0600	commented question	Create a vector of Mat from a three dimensional vector Yes and I always get a buffer with one image line.
2018-07-02 10:12:25 -0600	commented question	Create a vector of Mat from a three dimensional vector This is a hyperspectral cube coming from BIL format (http://desktop.arcgis.com/en/arcmap/10.3/manage-data/raster-and-ima
2018-07-02 09:15:42 -0600	asked a question	Create a vector of Mat from a three dimensional vector Create a vector of Mat from a three dimensional vector Hello, I have a vector of the type "std::vector< std::vector&