yuhanz2003 | 14 Jun 22:23 2012

OpenCV installation with SURF feature support on Ubuntu

Hi all,

I just installed OpenCV-2.4, and compiled and run my code,
but reached an error saying: "OpenCV-2.4.0/modules/legacy/src/features2d.cpp:77: error: (-213)
OpenCV was built without SURF support in function cvExtractSURF".

The code was working previously with OpenCV-2.2 on Windows.

Looks like I need to rebuild OpenCV with SURF. so, what are the parameters that I will need to enable in order
to make SURF feature work?

Thank you.

Yuhan

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pattern | 14 Jun 16:52 2012
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free video-processing software for spatial modifications

Hi there,
would anyone please give me a link to download a free video processing software that enables me to do some
spatial modifications to video frames(e.g., crop or mask a ROI).

Thanks in advance

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verma.shubhang | 13 Jun 14:39 2012
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Image Segmentation

Sir
I am new to opencv so if you could kindly guide me how to use the grow cut algorithm function in any sample
image. 

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jricardojr | 13 Jun 23:20 2012
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Affine Transform

Hello,

I'm working on a project where two images are given, where the second image is a modification of the first
one. This modification can be anything, like a filter, pixel modification or an affine transform, like
rotation or translation.

Does anybody knows if is it possible to use OpenCV in order to check if the transformation was an affine
transform, like rotation, for example, giving-me the rotation angle. 

Thanks a lot!

Jose Ricardo

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willemmerson | 14 Jun 12:06 2012
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recommended HD camera?

Hi, I want to purchase a camera with resolution higher than 640x480 for my project, but not sure which one
would be best? I wondered if anyone has had any experience with HD cameras?
I was looking at the Microsoft lifecam cinema camera, but it has autofocus which is going to mess up my
background subtraction unless I can control it somehow.
I also wondered why webcams have a much higher still image resolution than video image resolution. Are they
just interpolating?

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richie11122 | 13 Jun 16:52 2012

HoG+SVM -> HOGDescriptor::setsvmdetector

Hi,
I want to feed the HOGDescriptor (CPU interface) with a trained SVM. The HOG Descriptor offers a method
setSVMDetector(const vector<float>& detector) and I'm asking what has to be in vector<float>& detector?
All I found on the web was
http://opencv-users.1802565.n2.nabble.com/training-a-HOG-descriptor-td6363437.html , but
there is no confirmation about what to do.

I have a trained SVM which can create a xml file and in there are basically stored the
- support vectors
- alpha values
- rho
Of course, everything can also be loaded again, but only the support vectors are accessible from the
interface cvSVM that I use.

I wrote each support vector in a row and got a matrix A of support vectors. Now I've done [alpha1 alpha2
...alphaN] * [A] which gave me one vector. I assumed that rho is the bias which has to be added or
concatenated to this vector and then handed over to setsvmdetector().
But this doesn't work at all.

Please, has anyone an idea or any suggestion?
Please let me know.

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floyd3237 | 13 Jun 17:21 2012
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CvFuzzyMeanShiftTracker Module

Has anybody gotten the CvFuzzyMeanShiftTracker working ? Is there an example of how to make it work and the
order of the function calls ?

Thanks 

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paulal7489 | 13 Jun 14:39 2012

URGENT: Problem with matchTemplate

Hi everybody,

I just wrote the following code. Now I need to let the program check, which
templates are in the picture. I have more templates, but just two are always to
find. I tried it with a loop, but it is not working.
Any suggestions?

// fullProgram4.cpp : Definiert den Einstiegspunkt für die Konsolenanwendung.
//
#include "stdafx.h"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "iostream"
#include "stdio.h"
#include "cv.h"
using namespace cv;
using namespace std;

/// Global variables

/** General variables */
Mat src, edges;
Mat src_gray;
Mat templ, result;
Mat templ1, result1;
Mat templ6, result6;
Mat standard_hough, probabilistic_hough;
int min_threshold = 0;
int max_trackbar = 70;

(Continue reading)

Ahmed Albhy | 14 Jun 05:04 2012
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(unknown)





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Ardhendu Behera | 14 Jun 04:40 2012
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(unknown)





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Devon Yoo | 14 Jun 01:51 2012

Any1 good at writing efficient code?



Hi guys,

 

I have been trying to reduce processing time of my code and got stuck on one iteration code.

 

Here is what I am doing:

 

Mat src;

Mat dst;

For (x=0;x<width;x++){

    For(y=0;y<height;y++){

        If(src.at(y,x)[0] > 200)

            dst.data[dst.channels()*(dst.cols*y + x) + 0] = 255;

    }

}

[running time: 200ms]

 

To

 

Mat src;

Mat dst;

inRange(src, Scalar(200, 0, 0), Scalar(255,255,255), dst);

[running time: 25ms]

 

 

And here is where I am stuck:

 

Mat src;

Mat dst;

For (x=0;x<width;x++){

    For(y=0;y<height;y++){

        If(src.at(y,x)[2]/( src.at(y,x)[0] + src.at(y,x)[1] + src.at(y,x)[2]) > 0.5)  //simply, r/(r+g+b)>0.5

            dst.data[dst.channels()*(dst.cols*y + x) + 0] = 255;

    }

}

 

To

 

???

 

 

How can I rewrite that code to reduce the running time?

 

 

 



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