How to extract xyz coordinates from 3D point cloud in MATLAB -


i using kinect windows import 3d images matlab. want able find 3d co-ordinates of objects within 3d scene.

one simple way use clicka3dpoint function found here, , click point want know co-ordinates of.

the problem clicka3dpoint expects arguments in 3 n matrix, x y , z coordinates of n samples. when use kinect point cloud depthtopointcloud returns 480 * 640 * 3 matrix.

how can extract x, y, , z coordinates matrix can plot clicka3dpoint? (or scatter3?)

my attempt far:

depthdevice = imaq.videodevice('kinect',2)  %this kinect depth sensor  depthimage = step(depthdevice);  %this takes depth image. (a 480 * 640 uint16 array)  xyzpoints = depthtopointcloud(depthimage,depthdevice); %convert depth image point cloud  clicka3dpoint(reshape(xyzpoints,[3,307200])) %i'm guessing each of 480 * 640 points (307200 points) has x,y , z coordinate, concates coordinates of these points.

but plots points along diagonal line in 3d space. how extract x, y , z coordinates point cloud in matlab?

you can use pcshow function plot points, , take m-by-n-by-3 array directly. can turn on data tips , click on points in plot see coordinates.

if still want create 3-by-n matrix, easiest way following:

x = xyzpoints(:,:,1); y = xyzpoints(:,:,2); z = zyzpoints(:,:,3); points3d = [x(:)'; y(:)', z(:)'];

Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more