From ros-users-bounces@code.ros.org Tue Mar 1 10:22:51 2011 Return-Path: X-Original-To: www-data@code.ros.org Delivered-To: www-data@code.ros.org Received: from pub5.willowgarage.com (localhost [127.0.0.1]) by pub5.willowgarage.com (Postfix) with ESMTP id F069425C178; Tue, 1 Mar 2011 10:22:51 -0800 (PST) X-Original-To: ros-users@code.ros.org Delivered-To: ros-users@code.ros.org Received: from sam.nabble.com (sam.nabble.com [216.139.236.26]) by pub5.willowgarage.com (Postfix) with ESMTPS id E2EC325C139 for ; Tue, 1 Mar 2011 10:22:50 -0800 (PST) Received: from ben.nabble.com ([192.168.236.152]) by sam.nabble.com with esmtp (Exim 4.69) (envelope-from ) id 1PuUDi-0001YH-2T for ros-users@code.ros.org; Tue, 01 Mar 2011 10:22:50 -0800 Date: Tue, 1 Mar 2011 10:22:50 -0800 (PST) From: "gee [via ROS-Users]" To: ros-users Message-ID: <1299003770060-2605228.post@n3.nabble.com> In-Reply-To: <1CB0AD32-9DEB-40FA-B479-47B2F625A4F4@web.de> References: <428571.55513.qm@web113505.mail.gq1.yahoo.com> <1CB0AD32-9DEB-40FA-B479-47B2F625A4F4@web.de> MIME-Version: 1.0 Subject: Re: [ros-users] Calculating height of objects in 3D point clouds X-BeenThere: ros-users@code.ros.org X-Mailman-Version: 2.1.9 Precedence: list Reply-To: User discussions List-Id: User discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============4599048095990898195==" Mime-version: 1.0 Sender: ros-users-bounces@code.ros.org Errors-To: ros-users-bounces@code.ros.org --===============4599048095990898195== Content-Type: multipart/alternative; boundary="----=_Part_63754_20260137.1299003770070" ------=_Part_63754_20260137.1299003770070 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sorry about the information i missed in my last post. I have already transformed the camera data to world coordinates considering the tilt and other external parameters. But the problem is how do i calculate length, breadth or height of individual segments from their associated point cloud. As i have a grid of points for each segment i need to know how to consider these points to calculate length, breadth or height. For e.g., if a segment is such that it is directly facing the camera, to know its height, it is sufficient to calculate the distance between the points on the top most row and the bottom most row of the segment. The points which are in between need not be considered. obviously this heuristic works for a special case. I would like to know if there is a more general way to address this issue. I haven't considered kinect yet. ______________________________________ If you reply to this email, your message will be added to the discussion below: http://ros-users.122217.n3.nabble.com/Calculating-height-of-objects-in-3D-point-clouds-tp2600855p2605228.html This email was sent by gee (via Nabble) To receive all replies by email, subscribe to this discussion: http://ros-users.122217.n3.nabble.com/template/NamlServlet.jtp?macro=subscribe_by_code&node=2600855&code=cm9zLXVzZXJzQGNvZGUucm9zLm9yZ3wyNjAwODU1fC0xMTE1OTY4OTkw ------=_Part_63754_20260137.1299003770070 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Sorry about the information i missed in my last post. I have already transformed the camera data to world coordinates considering the tilt and other external parameters.  But the problem is how do i calculate length, breadth or height of individual segments from their associated point cloud.

As i have a grid of points for each segment i need to know how to consider these points to calculate length, breadth or height.
For e.g., if a segment is such that it is directly facing the camera, to know its height, it is sufficient to calculate the distance between the points on the top most row and the bottom most row of the segment. The points which are in between need not be considered.

obviously this heuristic works for a special case. I would like to know if there is a more general way to address this issue.


I haven't considered kinect yet.

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http://ros-users.122217.n3.nabble.com/Calculating-height-of-objects-in-3D-point-clouds-tp2600855p2605228.html
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