Comments for More Than Technical http://www.morethantechnical.com On software, code, the internet and more. Mon, 30 Apr 2012 20:52:27 +0000 hourly 1 http://wordpress.org/?v= Comment on Just a simple Laplacian pyramid blender using OpenCV [w/code] by Roy http://www.morethantechnical.com/2011/11/13/just-a-simple-laplacian-pyramid-blender-using-opencv-wcode/comment-page-1/#comment-20728 Roy Mon, 30 Apr 2012 20:52:27 +0000 http://www.morethantechnical.com/?p=962#comment-20728 @jack I've added a small main to the code excerpt. @jack
I’ve added a small main to the code excerpt.

]]> Comment on Just a simple Laplacian pyramid blender using OpenCV [w/code] by jack http://www.morethantechnical.com/2011/11/13/just-a-simple-laplacian-pyramid-blender-using-opencv-wcode/comment-page-1/#comment-20727 jack Mon, 30 Apr 2012 20:00:41 +0000 http://www.morethantechnical.com/?p=962#comment-20727 can you show how to use this in main, im getting assertion failure! hope to hear something soon! thank you! can you show how to use this in main, im getting assertion failure!
hope to hear something soon! thank you!

]]> Comment on Structure from Motion and 3D reconstruction on the easy in OpenCV 2.3+ [w/ code] by Roy http://www.morethantechnical.com/2012/02/07/structure-from-motion-and-3d-reconstruction-on-the-easy-in-opencv-2-3-w-code/comment-page-1/#comment-20121 Roy Wed, 18 Apr 2012 00:59:42 +0000 http://www.morethantechnical.com/?p=998#comment-20121 @nouba You are missing some piece of information to make it work. l = Fx is very good, but it results in a -line-, an epipolar line but a line still, that is - a collection of points, not a single point. If you wish to find a corresponding point from image 1 to one image 2, you can either use feature matching, optical flow, infer from other points you have knowledge for, or if you already know all or part of the 3D structure of the scene... there are plenty of ways. @nouba
You are missing some piece of information to make it work.

l = Fx
is very good, but it results in a -line-, an epipolar line but a line still, that is – a collection of points, not a single point.
If you wish to find a corresponding point from image 1 to one image 2, you can either use feature matching, optical flow, infer from other points you have knowledge for, or if you already know all or part of the 3D structure of the scene… there are plenty of ways.

]]> Comment on Structure from Motion and 3D reconstruction on the easy in OpenCV 2.3+ [w/ code] by nouba http://www.morethantechnical.com/2012/02/07/structure-from-motion-and-3d-reconstruction-on-the-easy-in-opencv-2-3-w-code/comment-page-1/#comment-20113 nouba Tue, 17 Apr 2012 18:42:31 +0000 http://www.morethantechnical.com/?p=998#comment-20113 hi, thank you so much for your great tutorial, it's really rare to find some good on the net. after matching the points and do test to filter a good points matching for calculating the Fundamental matrix, i m stock because i don't know how to use this matrix for finding correspondence point for every single pt in the image, in other terms scanning all points in img1(not only the corners detected by surf) and use fundamental to determinate their correspondence point from img2 with openCv.because l= F.x l:epiline F: fundamental matrix x: point coordinate thanks :) hi,
thank you so much for your great tutorial, it’s really rare to find some good on the net.

after matching the points and do test to filter a good points matching for calculating the Fundamental matrix, i m stock because i don’t know how to use this matrix for finding correspondence point for every single pt in the image, in other terms scanning all points in img1(not only the corners detected by surf) and use fundamental to determinate their correspondence point from img2 with openCv.because l= F.x
l:epiline
F: fundamental matrix
x: point coordinate
thanks :)

]]> Comment on Simple triangulation with OpenCV from Harley & Zisserman [w/ code] by maik http://www.morethantechnical.com/2012/01/04/simple-triangulation-with-opencv-from-harley-zisserman-w-code/comment-page-1/#comment-19852 maik Thu, 12 Apr 2012 16:18:30 +0000 http://www.morethantechnical.com/?p=1023#comment-19852 hi Roy, i think your source code is buggy at file Triangulation.cpp line 71 to 97 (watched at github). First you call the linear triangualtion method and after that you reweight the A and B matrix to calculate X again. Thats good but at line 71 you call the linear triangualtion method again, that overwrites the previous calculation of X. At the end each iteration ends with i == 1. Did i missunderstand your source code??? Thx in advance for your help! hi Roy,

i think your source code is buggy at file Triangulation.cpp line 71 to 97 (watched at github). First you call the linear triangualtion method and after that you reweight the A and B matrix to calculate X again. Thats good but at line 71 you call the linear triangualtion method again, that overwrites the previous calculation of X. At the end each iteration ends with i == 1. Did i missunderstand your source code???

Thx in advance for your help!

]]> Comment on Bust out your own graphcut based image segmentation with OpenCV [w/ code] by Roy http://www.morethantechnical.com/2010/05/05/bust-out-your-own-graphcut-based-image-segmentation-with-opencv-w-code/comment-page-1/#comment-19754 Roy Tue, 10 Apr 2012 12:35:56 +0000 http://www.morethantechnical.com/?p=634#comment-19754 @CV Obviously, the linker is missing the cvSVD function. Make sure all OpenCV .lib/.so/.dylib files are properly added to the linking step. @CV
Obviously, the linker is missing the cvSVD function.
Make sure all OpenCV .lib/.so/.dylib files are properly added to the linking step.

]]> Comment on Bust out your own graphcut based image segmentation with OpenCV [w/ code] by CV http://www.morethantechnical.com/2010/05/05/bust-out-your-own-graphcut-based-image-segmentation-with-opencv-w-code/comment-page-1/#comment-19753 CV Tue, 10 Apr 2012 10:51:53 +0000 http://www.morethantechnical.com/?p=634#comment-19753 @ Roy, Error 2 error LNK2019: unresolved external symbol _cvSVD referenced in function "public: void __thiscall GaussianFitter::finalize(struct Gaussian &,unsigned int,bool)const " (?finalize@GaussianFitter@@QBEXAAUGaussian@@I_N@Z) GMM.obj GrabCut what is needed here. @ Roy,
Error 2 error LNK2019: unresolved external symbol _cvSVD referenced in function “public: void __thiscall GaussianFitter::finalize(struct Gaussian &,unsigned int,bool)const ” (?finalize@GaussianFitter@@QBEXAAUGaussian@@I_N@Z) GMM.obj GrabCut

what is needed here.

]]> Comment on 20-lines AR in OpenCV [w/code] by William http://www.morethantechnical.com/2010/11/10/20-lines-ar-in-opencv-wcode/comment-page-1/#comment-19632 William Mon, 09 Apr 2012 06:14:44 +0000 http://www.morethantechnical.com/?p=732#comment-19632 I am new to the openGL and I want to combined 3d object into openCV2.3 in vc2010 C language. I think your code can be a good sample for me to learn. I am not good at coding. I compile it and it say 'pthread.h': No such file or directory Where can I find it or what should I do thanks I am new to the openGL and I want to combined 3d object into openCV2.3 in vc2010 C language.
I think your code can be a good sample for me to learn.
I am not good at coding. I compile it and it say
‘pthread.h’: No such file or directory
Where can I find it or what should I do

thanks

]]> Comment on Structure from Motion and 3D reconstruction on the easy in OpenCV 2.3+ [w/ code] by kewal http://www.morethantechnical.com/2012/02/07/structure-from-motion-and-3d-reconstruction-on-the-easy-in-opencv-2-3-w-code/comment-page-1/#comment-19516 kewal Fri, 06 Apr 2012 04:14:47 +0000 http://www.morethantechnical.com/?p=998#comment-19516 @roy I have completed course on building a robotic car. http://www.udacity.com/overview/Course/cs373 What I am asking is that is there any technique with which I can find that is there an obstacle in my robot's path & also can build map of environment so that I could apply path planning algorithm. I want to do above mention things by using single camera as a sensor and using your smf-toy library. @roy I have completed course on building a robotic car. http://www.udacity.com/overview/Course/cs373

What I am asking is that is there any technique with which I can find that is there an obstacle in my robot’s path & also can build map of environment so that I could apply path planning algorithm.

I want to do above mention things by using single camera as a sensor and using your smf-toy library.

]]> Comment on Structure from Motion and 3D reconstruction on the easy in OpenCV 2.3+ [w/ code] by Roy http://www.morethantechnical.com/2012/02/07/structure-from-motion-and-3d-reconstruction-on-the-easy-in-opencv-2-3-w-code/comment-page-1/#comment-19503 Roy Thu, 05 Apr 2012 14:13:12 +0000 http://www.morethantechnical.com/?p=998#comment-19503 @kewal That is a very big undertaking. Not only you are concerned with sensing from a single camera, but also with pathfinding algorithms and artificial intelligence. I would say the best way to start with some robotics tutorials online, and start building your robot simple, then going on to higher level vision from a single camera. @kewal
That is a very big undertaking. Not only you are concerned with sensing from a single camera, but also with pathfinding algorithms and artificial intelligence.
I would say the best way to start with some robotics tutorials online, and start building your robot simple, then going on to higher level vision from a single camera.

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