tracking | 易学教程

Reading barcodes with android

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问题 Hi I am developing an application for the android htc hero. I am looking into ways of using the inbuilt camer to read 2D barcodes and extract the string returned from the barcode. I have only recently begun working with the android sdk but I do have a programming background from working on projects with java. I am curious to know what the best way to read the 2D barcode would be. I have some sample applications that read the barcode but they are all .apk files and have no source or library

How to implement referral program in mobile Apps for both Android and iPhone

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问题 We have a mobile app that's available in both Google Play Store and Apple AppStore, we want to implement a referral program to get more users to install and use our App. Here's the user story: Every new user (E.g John) is given to a unique referral link, where he/she can share to FB/TW/Email or SMS. When John friend clicks the link, they are directed to respective AppStore base on their device. The moment John's friend install the app and open the app, our server should get notified, and we

Exactly how accurate is IP Geolocation?

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I'm setting up a iPhone tracking system for my friends, so they can submit their location to my website by their iPhone, anywhere, anytime - by WiFi or cellular data. The website will use Google Maps for their coordination's so that my other friends can track where they are, however, it is the accuracy of the IP to coordinates to Google Maps is what I'm concerned about, exactly how accurate is it to use Google Maps that would track down the locations by an IP address? I was thinking about 95%, but this was tested in a village which was quite fairly accurate, but what happens if it was in a

OpenCV 3 Tracker won't work after reinitialization

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问题 I have issue using OpenCV 3 tracking module for tracking. It behaves same, either I use interface class (cv::Tracker) or class with implementation (like cv::TrackerMedianFlow or cv::TrackerMIL, etc). Sample is a bit modified sample from OpenCV sample folder After correct creation Ptr<Tracker> tracker = Tracker::create( tracker_algorithm ); if ( tracker == NULL ) { std::cout << "***Error in the instantiation of the tracker...***\n"; return -1; } initialization works just fine if ( !tracker-

C# - How do I access the WLAN signal strength and others?

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Many scientists have published papers documenting how devices connected via WLAN can be tracked by measuring its Signal Strength, Time Of Arrival, Round Trip Time, etc. Any idea how I can access these values in Windows using any .NET API? Or do you know of software SDKs already available for location tracking? khadija hello for WIndows 7 this is a good code wich can detect all AP with MAC adress RSSI SSID : using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using NativeWifi; class

Real time GPS Tracker on JUST HTML / JS and Google Maps to be run on a handphone? Is it possible?

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I have read up on GPS Real time tracking and found out several things about it, mostly requiring PHP, zope and a database to store the incoming data. Some other methods uses ajax with relations to PHP. As regards to my question, is it possible to do so with just html and JS, using markers or anything else to populate the Google Map when you move anywhere in the city? Need some help on this, Thanks! Yes, it is possible. Most browsers in the latest smartphones have implemented the W3C Geolocation API : The Geolocation API defines a high-level interface to location information associated only

Create an Android GPS tracking application

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Recently I've taken up android development as a hobby and was looking to develop an application that can find and track a users position using Google Maps. Once the application has a GPS lock, The application can track their movements by drawing a route using an overlay class. I've seen similar applications like Mytracks that are open source but they're too complex for me right now. Ideally i'd love to create an application that looks like this He is my code below without the imports. What I'm trying to do is create an array of geopoints. Every time the location changes a new geopoint is

ASP.NET Tracking Code & Unique Visitors

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问题 I am trying to find a way to track and produce reports for my site (out of interest). Does anyone know of any articles/projects etc that you can Track pages / unique visitors etc Tracking 1) relative to timestamp etc in asp.net mvc or just asp.net ? P.S - I know google analytics etc is available but looking to create some basic stats for myself out of interest about how web analytics work ? 回答1: There are a couple of good ways to try and determine unique visitors, none of them are exact

Best way to keep track of current online users

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问题 I have a requirement that my site always display the number of users currently online. For example, "35741 Users Currently Online". This is not based on a log in, simply how many users are currently on my site. I have tried using Session Start/Session End for this, however session end is not reliable. Therefore I get inflated numbers, as my session start adds numbers but session end doesn't remove them because it doesn't fire. There is no additional information to be gathered from this

Question on tracking a moving ball using Kalman filter

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问题 I want to learn to track a moving ball using Kalman filter. Although many tutorial are available, I still have some questions. If we can extract the ball in each frame of the video sequence, we will know the position of the ball. Then, why do we need to use Kalman fiter anymore? What is the job of Kalman filter here? Kalman filter: x(k+1) = A.x(k) + B.u(k) + noise y(k) = C.x(k) + noise Then, how do we define A, B, C ? suppose we want to track the moving ball? 3 . If we know the previous state