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• How do I construct a 3D model of a room from 2 stereo cameras? What is the determining factor to an

  - by yasumi

  Currently, I have extracted depth points to construct a 3D model from 2 stereo cameras. The methods I have used are openCV graphCut method and a software from http://sourceforge.net/projects/reconststereo/. However, the generated 3D models are not very accurate, which leads me to question: 1) What is the problem with pixel-based method? 2) Should I change my pixel-based method to feature-based or object-recognition-based method? Is there a best method? 3) Are there any other ways to do such reconstruction? Additionally, the depth extracted comes only from 2 images. What if I am turning the camera 360 degrees to obtain a video? Looking forward to suggestion on how to combine this depth information. Thank you very much :)

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• Why does my Eclipse crash all the time?

  - by Marcel

  Somehow stupid question, I have to admit - hope it won't cost me too many points. To make it clear: I would also be happy if you can help me find the reason for the crashes. I wouldn't expect a precise answer. However, I don't see why my Eclipse is crashing (freezing) all the time. Mostly when I save a file. For some reason, crashes seem to increase lately... I use Eclipse Helios (Version: 3.6.1) and java version "1.6.0_20" (OpenJDK Runtime Environment (IcedTea6 1.9.2) (6b20-1.9.2-0ubuntu2) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)) on Ubuntu 10.10 (64-Bit). Thank you!

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• Approximate photo of a simple drawing using lines

  - by user3704596

  As an input I have a photo of a simple symbol, e.g.: https://www.dropbox.com/s/nrmsvfd0le0bkke/symbol.jpg I would like to detect the straight lines in it, like points of start and ends of the lines. In this case, assuming the top left of the symbol is (0,0), the lines would be defined like this: start end (coordinates of beginning and end of a line) 1. (0,0); (0,10) (vertical line) 2. (0,10); (15, 15) 3. (15,15); (0, 20) 4. (0,20); (0,30) How can I do it (pereferably using OpenCV)? I though about Hough lines, but they seem to be good for perfect thin straight lines, which is not the case in a drawing. I'll probably work on binarized image, too.

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• Problem with Google AJAX Search API RESTful interface

  - by robert_d

  When I send the following query http://ajax.googleapis.com/ajax/services/search/local?v=1.0&q=coffee%20New%20York%20NY using c# WebClient.DownloadString function or ordinary web browser I get JSON data which is different from data for the same query using JavaScript and Google AJAX Search API. From REST service I get the following url field http://www.google.com/maps/place?source003duds0026q003dcoffee0026cid003d13245583795745066822 but from JavaScript query I get this url field http://www.google.com/maps/place?source=uds&q=coffee&cid=13245583795745066822 The problem with REST service answer is that the url it gives points to a web page with error message "We currently do not support the location". What am I doing wrong?

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• Could someone give me their two cents on this optimization strategy

  - by jimstandard

  Background: I am writing a matching script in python that will match records of a transaction in one database to names of customers in another database. The complexity is that names are not unique and can be represented multiple different ways from transaction to transaction. Rather than doing multiple queries on the database (which is pretty slow) would it be faster to get all of the records where the last name (which in this case we will say never changes) is "Smith" and then have all of those records loaded into memory as you go though each looking for matches for a specific "John Smith" using various data points. Would this be faster, is it feasible in python, and if so does anyone have any recommendations for how to do it?

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• Plotting a cumulative graph of python datetimes

  - by ventolin

  Say I have a list of datetimes, and we know each datetime to be the recorded time of an event happening. Is it possible in matplotlib to graph the frequency of this event occuring over time, showing this data in a cumulative graph (so that each point is greater or equal to all of the points that went before it), without preprocessing this list? (e.g. passing datetime objects directly to some wonderful matplotlib function) Or do I need to turn this list of datetimes into a list of dictionary items, such as: {"year": 1998, "month": 12, "date": 15, "events": 92} and then generate a graph from this list? Sorry if this seems like a silly question - I'm not all too familiar with matplotlib, and would like to save myself the effort of doing this the latter way if matplotlib can already deal with datetime objects itself.

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• make mongrel_rails (localhost:3000) visible to a virtual machine

  - by Max Williams

  I develop rails in ubuntu and i just set up a virtualbox windows xp virtual machine for IE testing. I'd like to be able to run mongrel_rails in ubuntu and then jump into the vm to check it out, so i can jump back, make a change, jump into the vm again, reload the page and test it, etc. Is this possible? In this sort of situation in the past i've had to set up an apache server on my dev machine and run mongrel under that, in order to get an externally visible (ie visible to my local network) ip address that i then paste into the address bar of IE in the vm. Is this really necessary? Is there a simpler way? Can i do something with my /etc/hosts or sites-available files to just make up some arbitrary network address which points to localhost:3000 in ubuntu? Or something? thanks, max

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• How to point to other table's ID with hibernate?

  - by Wilhelm

  The problem: let's say I have two tables Client, and Product, in which Client has its primary key and a column called products (that points to pk's in Product table)... ok, if I need products to point only one row, it's nice, but if I need it to point for... 1000 rows in Product table, the products column would have to be larger enought... but I can't predict this situation. So, how could I design my table and how would I use hibernate with it, to achieve that "pointing" in a optmized and maybe "easy" way. NOTE: I excluded some columns of the "design" presented here, just to keep the simplicity.

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• ORM on iPhone. More simple than CoreData.

  - by Alexander Babaev

  The question is rather simple. I know that there is SQLite. There is Core Data also. But I need something in between. More object-oriented than SQLite API and simplier than Core Data. Main points are: I need access to stored entities only by id. No queries required. I need to store items of a single type, it means that I can use only one table if I choose SQLite. I want automatic object-relational conversion. Or object-storage if the storage is not relational. I can use object archiving, but I have to implement things (NSArchiver). But I want to write some kind of class and get persistence automatically. As it can be done with Hibernate/ActiveRecord/Core Data/etc. Thanks.

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• scrum and specifications

  - by zachary

  So we start Scrum today and start going over story points estimates. The first story that comes up is a new screen that needs to be developed. It has 1 sentence to describe the screen and 3 user acceptance tests. This starts a fight between the development team and the product owner. Product owner says that stories do not need to be speced out and they will just be fleshed out during the sprint. We say that the story needs to be completely speced out for the sprint. But now I am starting to be unsure about who is right.... Any good articles on this that I can send to the team about how defined a user story has to be?

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• Build Process failed with maven package

  - by vijay.shad

  Hi I am working on a maven project to build a simple utility api. The same source code when build on my office win XP machine, was successful. Now i am at home and working with same source code on CentOS machine. Here the build process failed strangely. The error it reports is ideally in my points should we warning message. As shown below. [ERROR] com.vsd.Provider:[12,240] The import java.util.Set is never used Can you please give me some idea, where can I look into?

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• How can I use Three20 to create a dynamic TTThumbsViewController that feeds from a website directory?

  - by Cory Robbins

  Hello, I'm pretty new to the iPhone developing scene, and I am designing an app for a high school band program. Part of the app needs to be an image gallery that retrieves photos from a directory on the band's website and lists them in the thumbnail view. I can't figure out how to create a thumsview that isn't directly linked to specific pictures. I currently have this setup to work with a UIWebView that points to a PHP photo album designed to look like the iPhone Photo Album. This method works, but it is not ideal, and the navigation is obviously a bit less than what would be expected. Is Three20 the right tool for this job? If not, what should I be using? Thanks!

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• Can I improve performance by refactoring SQL commands into classes?

  - by Matthew Jones

  Currently, my entire website does updating from SQL parameterized queries. It works, we've had no problems with it, but it can occasionally be very slow. I was wondering if it makes sense to refactor some of these SQL commands into classes so that we would not have to hit the database so often. I understand hitting the database is generally the slowest part of any web application For example, say we have a class structure like this: Project (comprised of) Tasks (comprised of) Assignments Where Project, Task, and Assignment are classes. At certain points in the site you are only working on one project at a time, and so creating a Project class and passing it among pages (using Session, Profile, something else) might make sense. I imagine this class would have a Save() method to save value changes. Does it make sense to invest the time into doing this? Under what conditions might it be worth it?

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• OpenGL texture not showing up on some computers, problem with auxDIBImageLoad?

  - by CptanPanic

  I have a simple openGL GUI that has uses a bmp as a texture. The problem is on some computers the texture doesn't show up. But on ones with newer OpenGL drivers it works. How can I make it more compatible. I think the problem may be with auxDIBImageLoad. When I inspect the result, I see the x,y correct, but the data pointer points to memory bank with all zeros. What could be wrong?

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• Whats are basic things you should kept in mind while writing functional tests?

  - by piemesons

  Hello, what kind of functionality should be covered in functional test? How to prioritize what are the functionality that must be covered in functional test. I can understand it depends upon on the project, whats the functionality present the project. Lets take a example of stackoverflow. Suppose we are developing a basic working model of this. What kind of functional test must be covered in this. Just brief what the key points while writing functional tests. (taking any basic functionality from this site just to understand the reference) Still its platform independent question.I am using ruby on rails developer, but keeping ruby on rails as mind will be preferable.

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• desktop module for existing web application

  - by maxxxee

  My client has a running web application which has been online for more than a year. Recently the client has introduced smart cards for his employees. Because of the difficulty in integrating smart card with its api on a web interface(i will post another detailed question on this later) we are planning to have desktop interface for this. There are 10-20 terminals which will use the desktop interface. 3 approaches for doing this that I have considered : Direct connection and operations on DB-Not using this because of data integrity and consistency issues. Build web service end points and use it from desktop interface Build a dll with common functions and use from both web and desktop Questions: 1. What are your opinions based on 2 and 3 approach? 2. Any other approach that I should consider? Note: I am using .Net framework, web application in asp.net

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• Single file in a working copy (branch) pointing to trunk under TortoiseSVN?

  - by Camsoft

  Got a very strange problem. I've got a working copy which is from a branch. When I commit any changes from this working copy, one single file in the working copy gets committed to the trunk. If I right-click this single file and click Commit the SVN URL displayed points to the /trunk and not the branch. How on earth could this happen? I used TortoiseSVN to create the branch in the first place. How can I fix this?

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• matlab: how to transform screen pixels into specific coordinates

  - by user3137385

  I have to draw a curve captured on a image using screen pixels (mouse clicks) into a coordinate system. E.g.: Pixels on the screen, from left to right (130 px to 970 px) correspond to the x-axis of my coordinate system (1000 to 6000). Pixels from bottom to top (670 to 99) correspond to the y-axis of coordinate system (0 to 1.2). How can this be done? Maybe there's a function in matlab doing something like that? Some more explanation: I have a jpg image of a curve on a coordinate system. I've got pixel positions (x,y) of several points on that curve. Now I want to plot same curve into a matlab figure with same x and y axis as on the jpg image.

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• Custom DataSource Extender

  - by Brian

  I dream of creating a control which works something like this: <asp:SqlDataSource id="dsFoo" runat="server" ConnectionString="<%$ ConnectionStrings:conn %>" SelectCommandType="StoredProcedure" SelectCommand="cmd_foo"> </asp:SqlDataSource> <Custom:DataViewSource id="dvFoo" runat="server" rowfilter="colid &gt; 10" datasourceid="dsFoo"> </Custom:DataViewSource> I can accomplish the same thing in the code behind by executing cmd_foo, loading the results into a DataTable, then loading them into a DataView with a RowFilter. The goal would be to have multiple DataViews for one DataSource with whatever special filters I wish to apply to the select portion of the DataSource. I could imagine extending this to be more powerful. I tried peaking at this and this but am a bit confused on a few points. Currently, my main issue is being unsure where to grab the output data of the DataSource so I can stick it into a DataTable.

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• What platforms have something other than 8-bit char?

  - by Craig McQueen

  Every now and then, someone on SO points out that char (aka 'byte') isn't necessarily 8 bits. It seems that 8-bit char is almost universal. I would have thought that for mainstream platforms, it is necessary to have an 8-bit char to ensure its viability in the marketplace. Both now and historically, what platforms use a char that is not 8 bits, and why would they differ from the "normal" 8 bits? When writing code, and thinking about cross-platform support (e.g. for general-use libraries), what sort of consideration is it worth giving to platforms with non-8-bit char? In the past I've come across some Analog Devices DSPs for which char is 16 bits. DSPs are a bit of a niche architecture I suppose. (Then again, at the time hand-coded assembler easily beat what the available C compilers could do, so I didn't really get much experience with C on that platform.)

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• Using Maven to build JAR from source in Subversion trunk

  - by Anonymouse

  There's a Java library that I would like to use in my project. My project uses Maven to pull in dependencies and it works great for everything except this one library. The problem is, this library never has releases. The author maintains the source in a Subversion repository and only makes changes in trunk. Is there a way I can tell Maven to Update (or check out) the library's source tree from Subversion Build it according to its POM Use the resulting jar as a dependency for this project Do this regularly (possibly at each build) For bonus points, mark which Subversion revision of that library I want to use Thanks!

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• Using htaccess redirect all files to another domain but exclude the root domain.

  - by Shawn

  Recently, I want to restructure and redesign my website, my old website located at www.example.com, there are lots of blog posts under this domain, like: www.example.com/post1 www.example.com/post2 www.example.com/post3 ... I can redirect all those posts to another sub domain points in another folder (not sub folder), (if I put all those posts in a sub folder, it will recursive the subfolder name) , anyway, it works for me by using the code below: RewriteEngine On RewriteRule ^(.*)$ http://pre.example.com/$1 [L,R=301] But there is one things I want to do is not redirect the main domain, only all the posts. RewriteEngine on RewriteCond %{REQUEST_URI} !^/blog/ # the new blog # I tried below #RewriteCond %{REQUEST_URI} !^/$ #RewriteCond %{REQUEST_URI} !^www.example.com$ RewriteRule ^(.*)$ http://pre.example.com/$1 [L,R=301] Is it possible I can do that? Thx.

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• Can I improve performance by refactoring SQL commands into C# classes?

  - by Matthew Jones

  Currently, my entire website does updating from SQL parameterized queries. It works, we've had no problems with it, but it can occasionally be very slow. I was wondering if it makes sense to refactor some of these SQL commands into classes so that we would not have to hit the database so often. I understand hitting the database is generally the slowest part of any web application For example, say we have a class structure like this: Project (comprised of) Tasks (comprised of) Assignments Where Project, Task, and Assignment are classes. At certain points in the site you are only working on one project at a time, and so creating a Project class and passing it among pages (using Session, Profile, something else) might make sense. I imagine this class would have a Save() method to save value changes. Does it make sense to invest the time into doing this? Under what conditions might it be worth it?

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• FlexBuilder 3 Linked folders not picking up as files.

  - by Jafin

  I am using Flex Builder 3 to write a flex component. I have created a real folder path \common. Under common I create a Linked Folder to Session. Session points to a shared source folder with a item with a namespace of common\Session\ClassName. When I go to compile the project FlexBuilder warns that it was unable to find the type. if I stop using Linked folders and create a physical \common\Session\ in my project and place SessionInfo.as in the folder then it works. just in case my textual explanation is a bit obscure here is the layout. \src\common\Session\SessionInfo.as namespace of SessionInfo is common.Session. If you need any further info just let me know.

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• C# - Getting record from a row using DataRow

  - by pinkcupcake

  I'm trying to get record of a row using DataRow. Here's what I've done so far: uID = int.Parse(Request.QueryString["id"]); PhotoDataSetTableAdapters.MembersTableAdapter mem = new PhotoDataSetTableAdapters.MembersTableAdapter(); PhotoDataSet.MembersDataTable memTable = mem.GetMemberByID(uID); DataRow[] dr = memTable.Select("userID = uID"); string uName = dr["username"].ToString(); Then I got the error: Cannot implicitly convert type 'string' to 'int' The error points to "username". I don't know what's wrong because I'm just trying to assign a string variable to a string value. Anyone figures out the reason of the error? Please help and thanks.

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