mat

问题 std::vector<cv::Mat1f> mat = std::vector<cv::Mat1f>(10,cv::Mat1f::zeros(1,10)); mat[0]+=1; for(size_t i=0;i<mat.size();i++) std::cout<<mat[i]<<std::endl; And it prints: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] How can I avoid

问题 I have a problem with .mat file and Simulink. I need to input data from .mat file to Simulink but not signals, i need to input variables in blocks. Block "From File" doesn't do any good for me since it only uses signals. Is there any way for me to use Simulink Callbacks, PreLoadFcn or InitFcn? Or is there some other way to do this? 回答1: You can specify MAT file as input for your model workspace data using Model explorer. Open model explorer from the view menu and then choose "model workspace"

问题 I have installed MAT tool in my eclipse. I have tomcat running on eclipse but no process is showing this, how to I proceed to fix get this working. I have configured eclipse to use JDK ( in installed jre ) 回答1: I have clicked on configure and given JDK path and it worked 来源： https://stackoverflow.com/questions/38522401/mat-eclipse-is-not-showing-any-running-process

问题 So I have a directory that has many .mat files: apples.mat, oranges.mat, bananas.mat, grapes.mat, apricots.mat, pears.mat, pineapple.mat All of these .mat files has a variable name "calories" assigned a value. How do I load all of these .mat files simultaneously in MATLAB and change the variables for each one from calories to calories_(fruit name) so that I can have all the variable values in the workspace to play with? For example, I want to load apples.mat and change its variable name from

问题 Based on my humble understanding, OpenCV's Mat handles the memory management efficiently; so copying Mats does not mean they are "hard/physically" copied; they just refer to the original Mat. However, for mats that has been pushed into a larger Mat using push_back, is it safe to clear them assuming that they were hard copied, not using same technique of copying like in x=y ? In the following code, does bigx still has x 's contents even after releasing the latter? Mat x, bigx; bigx.push_back(x

问题 I am writing my first program in OpenCV in Java and I'd like to ask, is it possible to load and display image from file only using Mat? I found solution on this website http://answers.opencv.org/question/31505/how-load-and-display-images-with-java-using-opencv/ but it changes Mat to Image before. I'll be grateful for any tips 回答1: Nope, there is no imshow equivalent in java. Please refer this link. 回答2: You can use the next code to transform a cvMat element into a java element: BufferedImage

问题 My question is how to convert the bitmap image which I got into onActivityResult into mat object so that I do some image processing using native part.I want to do the image Processing on my mat image.Thanks in advance private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) { @Override public void onManagerConnected(int status) { switch (status) { case LoaderCallbackInterface.SUCCESS: { //System.loadLibrary("nativegray"); Log.i(TAG, "OpenCV loaded successfully"); /

问题 Is there any easy way to multiplicate Mat and Vec_? (Provided, that they have proper sizes, e.g.: Mat_<double> M = Mat(3,3,CV_32F); Vec3f V=(1,2,3); result = M*V //? Maybe there is some easy method of creating row (or col) Mat based on Vec3? 回答1: You can't just multiply Mat and Vec (or, more generally, Matx_ ) elements. Cast the Vec object to Mat : Mat_<float> M = Mat::eye(3,3,CV_32F); Vec3f V=(1,2,3); Mat result = M*Mat(V); Also, I noticed an error in your code: when constructing M , the

问题 My web application is running in apache tomcat. The classloader/component org.apache.catalina.loader.WebappClassLoader @ 0x7a199fae8 occupies 1,70,86,32,104 (88.08%) bytes. The memory is accumulated in one instance of java.util.concurrent.ConcurrentHashMap$Segment[] loaded by <system class loader> . I got this problem while analyzing Heapdump. How to analyze it further ? 回答1: You provide very little information so I only can provide very little advice… ;-) First you need to find out who is

问题 Suppose, I have a 2D array initialized with values, how do I put this value in a Mat object in OpenCV? 回答1: Sorry don't know about Java but can suggest the general logic. In C++ openCV we do it by 2 for loops as following: matObject.create( array.rows, array.cols, CV_8UC1 ); // 8-bit single channel image for (int i=0; i<array.rows; i++) { for(int j=0; j<array.cols; j++) { matObject.at<uchar>(i,j) = array[i][j]; } } Let me know if it was your query.. 回答2: probably something like this will work