Immi's profile - activity

Hello all,

I'm looking for a method to recognize and identify textures. Is there any possibility to create something similar to haarClassifier.xml for textures? I don't want to use template matching.

Thanks in advance!

Immi

Do you use real images or self drawn ones? If you draw your pictures, you should filter them with a lowpass filter to get proper results from HoughCircles.

I hope it will help you.

Implement your own GLCM algorithm. You have:

1. Get the value of the actual pixel and its neighbour
2. Take those two values to adress the pixel in the GLCM-image
3. Increment that chosen pixel

Hi,

you should search the missing dll in opencv folder and add this to your exe-file.

I can't accept my answer at myself. Got to less points.

I solved the problem with:

• calculating the mean color and a compare it with a threshold
• calculating glcm and compare the glcm with PSNR function (Link to Tutorial)

I've solved it with average color and GLCM. Thank you for your hints!

I am also not so experienced in Cascade training, but I think you should use more than 15 stages. When I tried it, I got with 30 stages good results. And I'd take more negative images.

Did you try feature tracking for your logo? I think this could be also a solution. http://docs.opencv.org/doc/tutorials/features2d/table_of_content_features2d/table_of_content_features2d.html#table-of-content-feature2d

Yes, thats the reason. For more deteails, eg: Bradski, G. & Kaehler, A. Learning OpenCV: [computer vision with the OpenCV library (p.373)

I've seen this topic, but it's almost one year old, so something could change and the docu link is offline. That's why I opened new thread or better using the old topic? If there are just undocumented functions, I'll create one by myself.

Hi all,

I've read in some posts that the GLCM went into legacay. Is there a new function providing the same functionality? Or shall I use the legacy.hpp?

Best regards, Immi

Hi,

to solve this warnings goto: "Debug" its in the same list like "file" "edit"... -> "Options and Settings" -> in this window: Left side: "Debugging" -> "Symbols" -> Check "Microsoft Symbol Server"

I think, for mobile device is checking colors no solution, because of huge variance of luminance.

I'm just wondering about this error described in topic. It crashs equalizing one image. im1 = imread("im1.bmp, CV_LOAD_IMAGE_GRAYSCALE); im2 = imread("im1.bmp, CV_LOAD_IMAGE_GRAYSCALE);

equalizeHist(im1, im1); // then it crashs like described above. descriptors_2 is empty

//adding following line, it's working equalizeHist(im2, im2);

And now I'm asking, why this happens.

I have still a question for this problem: When I'm equalizing both images, it works also with the same image file. Why does it crash, when I'm equalizing only img_1?

Hi, I've found the solution: http://answers.opencv.org/question/11449/flann-algorithm-cannot-find-any-descriptor/ I was using the same picture for img_1 and img_2

Hi, thanks for your answers. I've loaded images with img_1 = imread("path", CV_LOAD_IMAGE_GRAYSCALE); after your comments I've tried with cvtColor() but the error was the same. descriptors_1 is not empty. Checked with .data and .empty().

The code is running, when both images are equalized.

Hi, I've just changed imread from variable to path and deleted the lines with check of arguments.Thanks for your help.

Hello all!

I've tried this tut: http://docs.opencv.org/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.html#feature-flann-matcher .

When I'm adding: equalizeHist(img_1,img_1) after loading the images, the program will crash. This crash at "matcher.match( descriptors_1, descriptors_2, matches );" with error: "OpenCV Error: Unsupported format or combination of formats (type=0) in unknown function, file ......\src\opencv\modules\flann\src\miniflann.cpp, line 315"

What changes in format does equalizeHist() do? Do you have some hints for me, to evade this error? Thanks in advance. Wish you a nice weekend.

Solution: http://answers.opencv.org/question/11449/flann-algorithm-cannot-find-any-descriptor/ I was using the same image. Immi

@Guanta May you tell my, why it crashes with Delete and not with calling destructor directly?

@Guanta (hope it get linked): I've played a little bit with this in OpenCV 2.4.4: When I'm trying it like described in the Question -> It works. I get a crash with: int main (void) { cout << "Creating" << endl; VideoCapture cap(0); cout << "Created" << endl; delete &cap; cout << "Deleted" << endl;

waitKey();
return 0;

}

I've used minMaxLoc in my sample and I'm getting always 0..1 (depends on method). Also when the template is not in picture I get with minMaxLoc best value.

Did you tried to call the destructor? ~VideoCapture();?

Did you tried x.release();?

destroyWindow(window_name);

Thank you for your help, I' ll try it!

Hi, I'll try this and reply.