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2018-01-09 05:23:53 -0500 marked best answer SIFT Descriptor content

I got really confused by the content of SIFT descriptor. As I got the descriptor should contain the orientation of keypoints. For each keypoint 128 numbers different orientations. And then a feature vector which is histogram of these orientations could be generated. My questions are first after saving the descriptor file I found that the orientations are not more than 150. I saved image with its keypoints using drawKeypoints function and DRAW_RICH_KEYPOINTS as the flag and in documentation it is said that : "For each keypoint the circle around keypoint with keypoint size and orientation will be drawn." In that image I could see some keypoints' orientations look like 300!! Why this is happened? and second the orientations should be in 8 dimensions, is that right? It means I should have just these numbers: 45,90,135, 180, 225, 270, 315 and 360. But I have more than these 8 directions in descriptor! Almost any number between 0 and 150. Why? Does it mean to make a histogram of keypoints I should group all orientations to those 8 groups myself?

Please someone give me an answer, There is a while I am reading about it and still have these issues to understand SIFT completely. Many thanks in advance

2018-01-09 05:23:33 -0500 commented question SIFT Descriptor content

Thanks @StevenPuttemans , but the link did not explain that much. I have read more papers and I found that I misundersto

2018-01-08 03:53:29 -0500 edited answer see the dictionary content from Bag of Words

As an answer to my question, for each Keypoints 6 or 7 different parameters were stored. In my case it's 7 parameters in

2018-01-06 23:04:31 -0500 marked best answer see the dictionary content from Bag of Words

Hi,

Is it possible to see the dictionary content as visual words from a bow? I found interest points and descriptors of a group of images and clustered them. Now I have a dictionary of visual words which is zero and ones. My question is that is there any way to see the visual words like a piece of image?

Any help would be appreciated.

2018-01-06 23:04:28 -0500 edited answer see the dictionary content from Bag of Words

As an answer to my question, for each Keypoints 6 or 7 different parameters were stored. In my case it's 7 parameters in

2018-01-06 23:02:02 -0500 answered a question see the dictionary content from Bag of Words

As an answer to my question, for each Keypoints 6 or 7 different parameters were stored. In my case it's 7 parameters in

2018-01-06 13:24:12 -0500 marked best answer BOWKMeansTrainer constructor

Hi, I have a question regarding BOWKMeansTrainer constructor. Would anyone please tell me what are the parameters of the constructor? I had a look at opencv document, but I could not find any useful information.

So far I know it has these parameters BOWKMeansTrainer::BOWKMeansTrainer(int clusterCount, const TermCriteria& termcrit=TermCriteria(), int attempts=3, int flags=KMEANS_PP_CENTERS ) And I know clusterCount is the dictionary size/number of clusters. I also guess that attempts is the K parameter for K-Mean. It means if it's 3 the trainer will calculate 3-Means/3 steps.

But I want to know what are the rests task?

Many thanks in advance,

Bests,

2018-01-06 13:24:12 -0500 received badge  Scholar (source)
2018-01-06 13:22:13 -0500 asked a question SIFT Descriptor content

SIFT Descriptor content I got really confused by the content of SIFT descriptor. As I got the descriptor should contain

2017-12-20 06:40:59 -0500 received badge  Student (source)
2017-12-20 06:17:38 -0500 edited question What is inside SVM XML classifier file?

What is inside SVM XML classifier file? I made bag of visual words and trained it using SVM. After training I saved clas

2017-12-20 06:14:08 -0500 edited question What is inside SVM XML classifier file?

What is inside SVM XML classifier file? I made bag of visual words and trained it using SVM. After training I saved clas

2017-12-20 06:13:08 -0500 asked a question What is inside SVM XML classifier file?

What is inside SVM XML classifier file? I made bag of visual words and trained it using SVM. After training I saved clas

2017-11-29 08:27:14 -0500 commented answer BOWKMeansTrainer constructor

Thanks for the comment. Could you explain more about iteration? which iteration you mean? Is this means value from each

2017-11-29 06:43:53 -0500 edited question BOWKMeansTrainer constructor

BOWKMeansTrainer constructor Hi, I have a question regarding BOWKMeansTrainer constructor. Would anyone please tell me

2017-11-29 06:40:06 -0500 asked a question BOWKMeansTrainer constructor

BOWKMeansTrainer constructor Hi, I have a question regarding BOWKMeansTrainer constructor. Would anyone please tell me

2017-11-29 06:40:03 -0500 asked a question BOWKMeansTrainer constructor

BOWKMeansTrainer constructor Hi, I have a question regarding BOWKMeansTrainer constructor. Would anyone please tell me

2017-11-29 05:44:23 -0500 commented question see the dictionary content from Bag of Words

Thanks @berak for your time. exactly drawKeypoints() could draw a circle of keypoints. Each circle is a visualizatio

2017-11-29 03:07:12 -0500 commented question see the dictionary content from Bag of Words

Thanks a lot @berak for the comment I have an xml file of keypoints and descriptors of 93 images. the file looks like t

2017-11-29 03:05:52 -0500 commented question see the dictionary content from Bag of Words

Thanks a lot @berak for the comment I have an xml file of keypoints and descriptors of 93 images. the file looks like t

2017-11-29 03:05:43 -0500 commented question see the dictionary content from Bag of Words

Thanks a lot @berak for the comment I have an xml file of keypoints and descriptors of 93 images. the file looks like t

2017-11-29 03:03:40 -0500 commented question see the dictionary content from Bag of Words

Thanks a lot @berak for the comment I have an xml file of keypoints and descriptors of 93 images. the file looks like t

2017-11-28 08:22:39 -0500 commented question see the dictionary content from Bag of Words

But I think the picture shows before clustering. I also want to see how they clustered!

2017-11-28 08:20:00 -0500 commented question see the dictionary content from Bag of Words

I used SIFT to find interest points and descriptor and Kmean to cluster them. Yes exactly like that picture. Is it possi

2017-11-28 08:03:36 -0500 asked a question see the dictionary content from Bag of Words

see the dictionary content from Bag of Words Hi, Is it possible to see the dictionary content as visual words from a bo

2017-11-07 00:50:40 -0500 received badge  Enthusiast
2017-11-06 10:37:49 -0500 commented question Haarcascading XML does not work properly

If you think I just came here and expect you to ask all my questions it's wrong. I did a lot researching, I could mentio

2017-11-06 10:12:50 -0500 commented question Haarcascading XML does not work properly

@berak sorry I don't have a text version of screenshots... No it was not necessary...

2017-11-06 10:08:23 -0500 commented question Haarcascading XML does not work properly

So, what's your suggestion to recognize different motions like running, walking, etc?

2017-11-06 09:58:13 -0500 received badge  Editor (source)
2017-11-06 09:58:13 -0500 edited question Haarcascading XML does not work properly

Haarcascading XML does not work properly I'm pretty new to OpenCV and cascade training. I did train a cascade to recogni

2017-11-06 09:55:32 -0500 asked a question Haarcascading XML does not work properly

Haarcascading XML does not work properly I'm pretty new to OpenCV and cascade training. I did train a cascade to recogni

2017-11-06 09:49:12 -0500 commented answer OpenCv calculate or convert the speed of a moving Object

@bincos sounds simple... but it could work just for linear movements... like car passing. Do you have any idea for movem

2017-10-31 09:13:14 -0500 commented answer OpenCv calculate or convert the speed of a moving Object

Thanks @bincon for the reply. Exactly, agree with you, but the main problem is here! I don't know how to calculate the

2017-10-25 07:33:22 -0500 answered a question Full body matching

Hi You could use Haar-like feature object detection. have a look at this: https://docs.opencv.org/trunk/dc/d88/tutorial_

2017-10-25 07:29:15 -0500 answered a question OpenCv calculate or convert the speed of a moving Object

Hi @bincos I have the same problem. Please let me know if you have found a solution for the problem and share your exp