surf

How to draw a SURF graph without black edges in Matlab?

The black lines are awfull, how I get rid of them? I want only the colored surfaces. ...

How to draw (semi-)logarithmic 3d plots? (Matlab)

I know semilogx and semilogy for 2D plots. There is any equivalent for SURF and MESH? ...

How to get a beautiful color scale on (semi-)logarithmic 3d plots on Matlab?

After having this question answered through a link to an external site, I realized that I solved a problem, just to get another one: On a logarithm scale the C=Z parameter of MESH and SURF functions don't work very well. All you get is a blue graph, without the usual color gradient, that you get by passing 3 parameters. How to revert th...

alfresco ---- how to add event handler into surf template ?

<div class="yui-gd"> <div class="yui-u first"><label for="${args.htmlid}-addContent">${msg("label.HowToAddContent")}:</label></div> <div class="yui-u"> <select id="addContent" name="addContent" onchange="dropdown(this)"> <option value="1" selected="selected">${msg("label.ge...

SURF and SIFT Alternative Object Tracking Algorithm for Augmented Reality

After asking here and trying both SURF and SIFT, none of them seams to be efficient enough to generate interest points fast enough to track a stream from the camera. SURF, for example, takes around 3 seconds to generate interest points for an image, that's way too slow to track a video coming from a web cam, and it'll be even worse when...

How to implement login mechanism in Alfresco Surf application

Hi all, i am playing around with alfresco WCM and want to implement a simple login mechanism in my surf application, so that I can show some information about the actual existing Alfresco user. Can anyone give me a hint? I already walked through http://www.benh.co.uk/alfresco/surf-part-1-getting-started/ but now I get stucked. Tha...

OpenCV / SURF How to generate a image hash / fingerprint / signature out of the descriptors?

There are some topics here that are very helpful on how to find similar pictures. What I want to do is to get a fingerprint of a picture and find the same picture on different photos taken by a digital camera. The SURF algorithm seams to be the best way to be independent on scaling, angle and other distortions. I'm using OpenCV with th...

What is a vocabulary tree and how to build one?

I'm reading a lot about vocabulary trees when it comes to fast queries for similar images or texts in big databases. But I couldn't find any good (easy to unserstand) description on what such an vocabulary tree is and how to build one out of features. ...

Is there a way to show a 3-D surface plot in the browser?

I've got a bunch of data for 3-D surface plots. I want to build a quick web interface to let me browse through that data. Are there any (free) packages out there that can easily show surface plots? I found this question but the suggested libraries did not support surface plots. If it requires a plugin like flash / java that is fine. Thi...

Speeded-Up Robust Features SURF

Hi Guys, I'm implementing SURF algorithm and I'm referring to the Chris Evan's OpenSURF (Sorry, The link doesn't seem to work). In OpenSURF and in almost all the other SURF implementations I see that when Dxx and Dyy are computed a multiplying factor 3 is used(look at the code below). No where in the SURF paper or OpenSURF paper is it m...

Find Exact Matches of SURF in openCV

I am using openCV Surf tracker to find exact points in two images. as you know, Surf returns many Feature points in both images. what i want to do is using these feature parameters to find out which matches are exactly correct (true positive matches). In my application i need only true positive matches. These parameters existed : Hessia...

OpenCV SURF, is it normal that the captured videos lag by a little? How to speed it up?

How do I speed up the correspondence matching processes of SURF? I used the samples provided and changed it to capture color images from the webcam for processing, however, the speed certainly needs improvement. Where should this be tackled on? ...

A good method for detecting the presence of a particular feature in an image

I have made a videochat, but as usual, a lot of men like to ehm, abuse the service (I leave it up to you to figure the nature of such abuse), which is not something I endorse in any way, nor do most of my users. No, I have not stolen chatroulette.com :-) Frankly, I am half-embarassed to bring this up here, but my question is technical an...

matlab: how to plot multidimensional array

Hello, Let's say I have 9 MxN black and white images that are in some way related to one another (i.e. time lapse of some event). What is a way that I can display all of these images on one surface plot? Assume the MxN matrices only contain 0's and 1's. Assume the images simply contain white lines on a black background (i.e. pixel valu...

What is SSO authentication touch point used for?

I find there are following code in NTLMAuthenticationFilter.java which used for alfresco share SSO authenticate: Response remoteRes; if (cachedNtlm) { Connector conn = connectorService.getConnector(this.endpoint, session); ConnectorContext ctx = new ConnectorContext(null, getConnectionHeaders(conn)); remote...