2017-06-07 08:30:40 -0600 asked a question Integral Projection Is there anyone knowing about Integral projection? and i wish you give me a sample of code of integral projection ? I don't know about integral projection. This's very important for my final project. please help me. thank you. 2017-01-31 08:48:05 -0600 asked a question Matrix Deviation I want to make dev1,dev2,dev3 to array mat like ( dev[d] )but i can't. Mat dev1,dev2,dev3; dev1=Mat(align)-average; dev2=Mat(align)-average; dev3=Mat(align)-average;  is there anyone can help me? thank you 2017-01-25 04:36:01 -0600 commented question Convert Mat 5x5 to Vector It contains matrix (x,y). is that wrong? 2017-01-25 04:12:35 -0600 asked a question Convert Mat 5x5 to Vector This is Matrix 5x5 , I want to convert it to vector. But it failed. I use reshape(0,1) and the error says bad number of row.  [ 3.76666679e+001, -1., 40., -1., 3.06666660e+001, -1.,3.06666660e+001, -1., 27., -1., 40., -1., 4.46666679e+001, -1.,3.53333321e+001, -1., 3.43333321e+001, -1., 30., -1., 3.06666660e+001, -1., 3.53333321e+001, -1., 3.03333340e+001, -1.,28., -1., 24., -1., 3.06666660e+001, -1., 3.43333321e+001, -1., 28., -1., 29., -1., 25., -1., 27., -1., 30., -1., 24., -1., 25.,-1., 2.23333340e+001, -1. ]  Any somebody knows my problem? My code always difficult to reshape. Thank you 2017-01-21 08:02:25 -0600 commented question Calculate Eigen Vector and Eigen Value for PCA The data is vector x y -> 25 data. and I change/ reshape it to nxn = 5x5 (this is int). after that I convert to 32F. and that the result. any i idea for change it to 1 channel matrix with row n column same . thank you 2017-01-21 07:44:04 -0600 asked a question How to change 2 channel matrix to 1 channel matrix Mat covmat ; //is 2 channel matrix , and 5 row*5 col and I wanna change it to 1 channel matrix. How? I have tried to change with reshape(1,n), I got 1 channel matrix, but the column changed to 10. I want to get 1 channel matrix but the row and col still same. Any Idea? Thank you. 2017-01-21 06:14:26 -0600 commented answer Calculate Eigen Vector and Eigen Value for PCA Ok, thank you, I will try it. 2017-01-21 01:30:11 -0600 commented answer Calculate Eigen Vector and Eigen Value for PCA So, how to make it, to be single channel? I'm a beginner in opencv. 2017-01-21 01:27:43 -0600 asked a question Error to get eigenvector and eigenvalue in opencv I want to get eigen vector and eigen value from PCA value. this's my part of code. Data from txt file (matdev) %YAML:1.0 Point: !!opencv-matrix rows: 5 cols: 5 dt: "2f" data: [ 0., 0., 1., 0., -1., 0., 0., 0., 0., 0., 0., 0., -1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 1., 0., -1., 0., 0., 0., 1., 0., 1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ]  PCA pt_pca(covmat, Mat(), CV_PCA_DATA_AS_ROW, 0); Mat pt_eig_vals = pt_pca.eigenvalues; for (int i = 0; i < 4; ++i) cout << pt_eig_vals.at(i, 0) < in unknown function, file ......\src\opencv\modules\core\src\matmul.cpp Please somebody help me. :(. Thank you so much 2017-01-21 01:19:32 -0600 asked a question Error to get EigenVector and Eigen Value I want to get eigen vector and eigen value from PCA value. this's my part of code. Data from txt file (matdev) %YAML:1.0 Point: !!opencv-matrix rows: 5 cols: 5 dt: "2f" data: [ 0., 0., 1., 0., -1., 0., 0., 0., 0., 0., 0., 0., -1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 1., 0., -1., 0., 0., 0., 1., 0., 1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ] Mat covmat=((matdevmatdev.t())/3); //data float matrix 55, this's working. but when I add with PCA function. It's break. PCA pt_pca(covmat, Mat(), CV_PCA_DATA_AS_ROW, 0); Mat pt_eig_vals = pt_pca.eigenvalues; for (int i = 0; i < 4; ++i) cout << pt_eig_vals.at(i, 0) < This is the error. OpenCV error: Assertion Failed in unknown function, file ......\src\opencv\modules\core\src\matmul.cpp Please somebody help me. :(. Thank you so much  2017-01-21 01:15:11 -0600 commented question Calculate Eigen Vector and Eigen Value for PCA matdev is matrix data from txtfile like this. %YAML:1.0 Point: !!opencv-matrix rows: 5 cols: 5 dt: "2f" data: [ 0., 0., 1., 0., -1., 0., 0., 0., 0., 0., 0., 0., -1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 1., 0., -1., 0., 0., 0., 1., 0., 1., 0., -1., 0., 0., 0., -1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ]