Birds in Flight Tutorial

 Birds, Tutorials  Comments Off on Birds in Flight Tutorial
Nov 052019
 

This is a short tutorial on how to use the CHDK hack with your Canon camera to freeze birds in flight. The setup I use is shown below.

First download the CHDK MDFB2013 script and add two minus signs to the start of line “set_prop(props.FLASH_MODE, 2) -- flash off“. This will allow the flash to fire.

Use CHDK Enhanced Photo Operations to select the maximum flash power and set Tv to a low value such as 0.0003s. I use Av mode with a wide open aperture and ISO 100. I focus on the feeder in Macro mode and then switch to manual focus. Set the flash to always fire.

I then leave the MDFB2013 script running for a while. I found that the script is not fast enough to catch the birds landing so most of the shots are of the birds on the feeder. However, you should get several shots of the birds taking off like below.

Click on an image below to see some results.

 Posted by at 9:17 am

Vultures in DMS

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May 292019
 

Dave Lochhaas kindly gave me permission to show his first published video using Dave’s Motion Stacker. Great to see how they trace out rollercoaster tracks in the sky.

 Posted by at 7:11 pm

Dave’s Motion Detector – First Trial

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May 282019
 

This is a first test of my latest software. It allows you to scan multiple videos and only select scenes with action. Great for subjects like bird feeders above.

 Posted by at 10:42 am

Painting by Birds – First Results

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Mar 082019
 

Here is the first result from my latest app. It processes video of the sky and adds color trails to all the birds. Click on the image to view the video.

Painting by Birds over Inverness – 18th March 2019

 Posted by at 3:05 pm

3D Gulls

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Mar 122018
 

Another 3D spectrogram of gulls but this time taken with my £20 Adokey voice recorder.

Click on the image or here to view the interactive 3D version. Zoom with your mouse wheel and click-drag to rotate.

 Posted by at 2:08 pm

3D Spectrogram Tutorial

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Mar 042018
 

This tutorial shows you how to easily make interactive 3D Spectrogams like this using Audacity. The source files are zipped up here which includes the “spectrogram.html” file you will need for your own spectrogram.

Click image for interactive 3D version

The 3D graphics are powered by the Babylon.js framework which does all the hard stuff for you.

1. Select Your Audio:- Choose the audio you want to display, optimise it and save it to “original.wav”.

2. Grab Audacity Screenshots:- Load “original.wav” and show its color spectrogram. Hide all toolbars and zoom in to fill track with audio information. Use Audacity>Help>Tools>Screenshot Tools to take a color screenshot. Change spectrogram to monochrome and take another screenshot.

Continue reading »

 Posted by at 12:55 pm

3D Birdsong

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Mar 032018
 

I have been experimenting with processing birdsong in the Audacity sound editor. This is a very powerful and free program which is great for recording and cleaning up audio and inspecting its frequency spectrum. I used the Audacity spectrogram to generate a 3D model that you can view in your browser.

Click on the image below to view the 3D spectrogram. Zoom in with your mouse wheel and click-drag to rotate the view. The robin sings once at 1x speed and then again at half speed so you can follow the detail.

Click image for 3D model with sound

Click image for 3D model with sound

BTW, this was recorded on my £15 Logitech C270 webcam feeding in to Audacity. I set Audacity up to record automatically at 4am and stop at 8am.

 

 Posted by at 2:57 pm