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Category: Data Mining

Image Enhancements

Image Enhancements

Introduction A couple of years ago I wrote about imaging enhancements using ImageMagick. However, I didn’t really cover it in too much detail. One of those methods was the normalization process. This method basically analyzes the histogram of an image and adjusts the black and white levels. The results are a clearer picture with less shadow washout and crisper colors. This process has some limitations. In this post I’ll cover some additional methods for image enhancements. I’ll continue to work…

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3D Rendering from Facebook Videos

3D Rendering from Facebook Videos

First, source your video from facebook.  I used a video shot from a motorbike of a structure on side of the road.  It was from a post of a road trip in Indonesia by a fellow with my same name.  The scene reminded me of my travels in the Southwest Pacific when I was younger.  It looked like good material as a source for model rendering. For more information on the following steps, see this link for the details.  I…

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Multimedia Meta-data – More than meets the eye

Multimedia Meta-data – More than meets the eye

It is time to step back from system administrative tasks and move back into the subject of digitized multimedia data processing.  The subject is a vast ever evolving beast.  Multimedia basically consists of some combination of visual or auditory information.  With digitized multimedia, additional data can be layered which provides any number of uses. In this post, I’ll be focusing on image file meta-data.  There are several levels and flavors of meta-data which I won’t cover in detail here.  However,…

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RPi Network Packet Analysis Tooling

RPi Network Packet Analysis Tooling

In this post, I’ll cover using the Rpi as a network analysis tool. The hardware of the Rpi and the open source software that runs on it is an extremely cost effective method to network diagnostics and troubleshooting. The hardware layout I’ll be using is fairly simple. The Rpi 3 has built in interfaces for both wired and wireless connections. I’ll be using the wired connection as my packet sniffing port. It will not have any IP bound to it….

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Cacti Custom Graphing Features

Cacti Custom Graphing Features

The default graphs that ship with Cacti provide a good starting point for your monitoring needs. However, you may find that the graphs don’t draw attention to what you would like. In this post, I’ll cover steps to customize your graphing functions. Also, we’ll cover ways to get more text information on your graphs, so lets begin. The default network traffic graph is reminiscent of the days of MRTG. I like to set my graph with both inbound and outbound…

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Raspberry Pi 3 GQRX SDR

Raspberry Pi 3 GQRX SDR

The Raspberry Pi 3 has enough power to run applications that were out of reach of earlier versions.  Software Defined Radio, commonly known as SDR, is such an application.  There are several program options that can be installed.  I’ll be covering GQRX because it powered by GNU-Radio and Qt.  You can find more information about the software at http://gqrx.dk/ Installing gqrx is done by follownig the instructions outlined on the GQRX developer’s website, http://gqrx.dk/download/install-ubuntu Here is an excerpt. For Ubuntu…

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Academic Roundup

Academic Roundup

Summary – it’s getting closer So far, there has been 15 of 20 posts that have stayed on topic with the goals defined at the beginning of this years studies.  I’ve managed to release at least 3 posts per month that covered the intended material.  Here’s a list of those topics based on grouping. Raspberry Pi Specific Raspberry Pi – The basics Command and control as easy as RPi RPi email using sSMTP RPi Backup and Restore Hardware Selecting an…

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Spring Heartbreak

Spring Heartbreak

RPi Dashcam Here’s a step by step using raspivid, super simple. RPi Bluetooth and WiFi I found it much easier to just use a USB adapter Edimax EW-7811Un, these instructions make it look easier than what I experienced with Adafruits “Ourlink” adapters.  I think my new AP doesn’t support the Ourlink band, so I had a sourlink. Here’s one from Plugable. BLE Revisited Bluetooth basic tutorial – from Sparkfun BC118 BLE Mate 2 Hookup Guide – from Sparkfun…don’t get too…

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Augmented reality

Augmented reality

Introduction – seeing what is relative This will be more of an introduction on the topic of augmented reality.  It will be platform independent, but it may make reference to various types of devices.  Basically it is creating a visual experience that is a combination the natural world and digital. The concept of enhancing a visual object, in real time, with detail is the idea behind augmented reality.  Its easier to explain with application that to describe it outright.  Grocery…

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Remote and Local RPi Sensors in Cacti

Remote and Local RPi Sensors in Cacti

Introduction – how’s it going This post will cover the logging of data in Cacti using non SNMP/WMI sources.  We’ll gather local RPi information and plot it in Cacti.  Then we will go through the procedures to gather data from the internet and process it into Cacti.  This is an expansion of the NOAA XML file processing done in an earlier post. Purpose – having a reference can give you an idea of were you’re going Cacti is a multi…

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