c - grouping motion vectors -


i using -lucas-kanade algorithm calculate optical flow of video sequences opencv. got motion vectors. want group motion vectors in clusters. vectors near each other want group them together. thing nearest neighbor approach. don't know how can implement same. appreciated.

thank you.

i used cvkmeans2() group corner points after running optical flow algorithm...

i have clusters in vector of vectors clustercontainer. want draw boundary line around every clusters..i not sure how can so...if knows please help.

using below code opencv manual draw circle around every cluster..but want draw rectangle rather circle..any body please me.

    for(int h = 0; h < clustercontainer.size(); h++ )         {             cvpoint pt1,pt2;                cvmat box[100];             pt1.x=(int)points->data.fl[h*2];            pt1.y=(int)points->data.fl[h*2+1];               cvcircle( frame1, pt1, 20, cv_rgb(255,255,0),4);  }

enter image description here

to obtain bounding rectangle set of points, can use opencv boundingrect() function. note similar fitellipse() function.

boundingrect
calculates up-right bounding rectangle of point set.

c++: rect boundingrect(inputarray points)   python: cv2.boundingrect(points) → retval c: cvrect cvboundingrect(cvarr* points, int update=0 ) python: cv.boundingrect(points, update=0) → cvrect

parameters: points – input 2d point set, stored in std::vector or mat.
function calculates , returns minimal up-right bounding rectangle specified point set.

fitellipse
fits ellipse around set of 2d points.

c++: rotatedrect fitellipse(inputarray points) python: cv2.fitellipse(points) → retval c: cvbox2d cvfitellipse2(const cvarr* points) python: cv.fitellipse2(points) → box2d

parameters: points – input 2d point set, stored in:

std::vector<> or mat (c++ interface) cvseq* or cvmat* (c interface) nx2 numpy array (python interface)

the function calculates ellipse fits (in least-squares sense) set of 2d points best of all. returns rotated rectangle in ellipse inscribed. algorithm [fitzgibbon95] used.


Comments

Post a Comment

Popular posts from this blog

jquery - Invalid Assignment Left-Hand Side -

i trying assign class tag via jquery, resulting in error through firebug says "invalid assignment left-hand side" on fourth line below. <cfoutput> $('.pngfix a').each(function(index) { var hreflink = $(this).attr("href"); if (hreflink.tolowercase() = '../audio.cfm') { $(this).addclass('audioimg'); } }); </cfoutput> looking around online, looks syntax problem, don't seem see it... any tips? thanks if (hreflink.tolowercase() = '../audio.cfm') that attempts assign value, rather check equality. change = operator == .
Read more

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more