Friday, January 13th, 2012, 27 days ago

Capturing images from webcams using openCV in Ubuntu 11.04

opencv 2.3.1-video-capture-image

This is a simple example of capturing live images from webcams using the new installed OpenCV 2.3.1 in the Ubuntu. The relevant information of OpenCV 2.3.1 install can see my previous posts -


Installing openCV in Ubuntu with pandaboard part 1
Installing openCV in Ubuntu with pandaboard part 2
Installing openCV in Ubuntu with pandaboard part 3 – the network proxy
Installing openCV in Ubuntu with pandaboard part 4 – compiling openCV 2.3.1
Installing openCV in Ubuntu with pandaboard part 5 – running openCV 2.3.1 examples, and
Tutorial: A Comprehensive Guide to Installing and Configuring OpenCV 2.3.1 on Ubuntu

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Wednesday, January 11th, 2012, 30 days ago

Fixing ‘[libavutil/libavutil.so.51] Error 1′ in ffmpeg make for openCV 2.3.1 install

Screenshot-cw418@hud-desktop: ~-Documents-OpenCV-2.3.1-build-1

This post describes an error and its solution in ffmpeg make for openCV install. It is based on Osman’s comprehensive troubleshooting of openCV 2.3.1 installing and configuring, but adds an additional error – ‘[libavutil/libavutil.so.51] Error 1‘ and the solution.

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Tuesday, January 10th, 2012, 31 days ago

Fixing ‘ QMainWindow: No such file or directory’ in v4l installation with Ubuntu

Screenshot-cw418@hud-desktop: ~-Documents-OpenCV-2.3.1-build

Thanks to the comprehensive troubleshooting guide to opencv installation posted by Osman, some install errors could be referred and fixed. But some errors are not included in that guide, as the chance of the error is various.

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Sunday, January 8th, 2012, 33 days ago

The first set of images captured from the Xtion pro with Ubuntu on Pandaboard

Screenshot - xtion depth image 1

The initial outcomes of the OpenNI installation

A previous post has described an overall progress of installing OpenNI in Linux-arm -based pandaboard with Xtion pro. This post is a sequence of the instsallation, which demonstrates the success of OpenNI installation, and the working of Xtion pro with Linux-arm Ubuntu.

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Saturday, January 7th, 2012, 34 days ago

Installing OpenNI for Linux-ARM in Ubuntu Pandaboard

Screenshot-cw418@hud-desktop_ ~-Documents-OpenNI-Platform-Linux-Build-1-make-install

About OpenNI

OpenNI has shown some lights to natural interactions by using depth map images together with RGB images from cameras. Natural human gestures, e.g. hand moving, limbs movements are all being developed fast. Microsoft Kinect is a typical example that demonstrated the huge potential of the OpenNI in terms of game applications. While, more work could be done with OpenNI, with other devices that could capture depth images, e.g. ASUS’s Xtion pro. In the OpenNI community supported by manufacturers e.g. Primesense, Microsoft and Asus more information could be found in openni.org.

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Thursday, December 22nd, 2011, 50 days ago

Installing openCV in Ubuntu with pandaboard part 5 – running openCV 2.3.1 examples

Screenshot-root@hud-desktop: ~-Downloads-OpenCV-2.3.1

The last tutorial about installing opencv in ubuntu with pandaboard 4 – compiling the opencv 2.3.1 did not complete the final compile steps, this post aims to complete that.

Continue the compiling of openCV 2.3.1

I assume you have finished the openCV compiling using cmake ., make, and make install commands in the terminal. Bear in my mind there is one thing I need to remind – be aware of the system date and time, as I left that incorrect and made some unnecessary compiling mistakes.

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