Latest Articles

Insight into Hyper-V Storage

by Zahir Hussain Shah | May 2013 | Enterprise Articles

In this article by Zahir Hussain Shah, the author of Windows Server 2012 Hyper-V: Deploying Hyper-V Enterprise Server Virtualization Platform, we will dive deeper into Hyper-V storage, where we will discuss the various types of storage options available with Microsoft Windows Server 2012 Hyper-V for a virtual machine in detail.

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Android Native Application API

by Feipeng Liu | May 2013 | Cookbooks

Thanks to the Android native application APIs, it is possible to write an Android application with pure native code since Android API level 9 (Android 2.3, Gingerbread). That is, not a single line of Java code is needed. The Android native APIs are defined in several header files under the <NDK root>/platforms/android-<API level>/arch-arm/usr/ include/android/ folder.

In this article by Feipeng Liu author of Android Native Development Kit Cookbook, we will cover the following recipes:

  • Creating a native activity with the native_activity.h interface

  • Creating a native activity with the Android native app glue

  • Managing native windows at Android NDK

  • Detecting and handling input events at Android NDK

  • Accessing sensors at Android NDK

  • Managing assets at Android NDK

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Tracking Faces with Haar Cascades

by Joseph Howse | May 2013 | Open Source

This article by Joseph Howse, author of OpenCV Computer Vision with Python introduces some of OpenCV's tracking functionality, along with the data files that define particular types of trackable objects. Specifically, we look at Haar cascade classifiers, which analyze contrast between adjacent image regions to determine whether or not a given image or subimage matches a known type. We consider how to combine multiple Haar cascade classifiers in a hierarchy, such that one classifier identifies a parent region (for our purposes, a face) and other classifiers identify child regions (eyes, nose, and mouth).

We also take a detour into the humble but important subject of rectangles. By drawing, copying, and resizing rectangular image regions, we can perform simple manipulations on image regions that we are tracking.

By the end of this article, we will integrate face tracking and rectangle manipulations into Cameo. Finally, we'll have some face-to-face interaction!

All the finished code for this article can be downloaded from my website: http://nummist.com/opencv/3923_04.zip.

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What is OpenLayers?

by Alessio Di Lorenzo Giovanni Allegri | May 2013 | Open Source

In this article by Alessio Di Lorenzo and Giovanni Allegri, the authors of the book Instant OpenLayers Starter, we will discuss some basic points about OpenLayers

OpenLayers is an open source map viewing library, originally developed and released by MetaCarta under a BSD license. It is written in pure JavaScript and makes it easy to incorporate interactive maps from a variety of sources into your web pages and applications.

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Move Further with NumPy Modules

by Ivan Idris | May 2013 | Beginner's Guides Open Source

NumPy has a number of modules that have been inherited from its predecessor, Numeric. Some of these packages have a SciPy counterpart, which may have fuller functionality. The numpy.dual package contains functions that are defined both in NumPy and SciPy. The packages discussed in this article are also part of the numpy.dual package.

In this article by Ivan Idris from the book NumPy Beginner’s Guide - Second Edition, we shall cover the following topics:

  • The linalg package
  • The fft package
  • Random numbers
  • Continuous and discrete distributions
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