Friday, January 9, 2009

Frame Grabber Upgrade

Unhappy with the results I was getting with the Hauppauge WinTV cards I had, I picked up a Canopus ADVC110 audio/video converter box. The Canopus box is capable of delivering much higher resolution (720 x 480 @ 30fps) than the Hauppauge card's miserable 352 x 288. The difference in image quality was immediately and strikingly obvious - a big improvement!

The Sentinel camera feeds in a composite video NTSC signal to the Canopus which converts it on the fly and outputs the video stream to the PC/laptop via a 1394-FireWire connection. My laptop already has firewire but none of my desktop PCs had it so I picked up a four port PCI FireWire card on eBay for around $8 + postage.

Here's how the sky looks using the Hauppauge frame grabber:

and here's how it looks with the Canopus ADVC110 box:

If a fireball or other transient event is captured, a section of the avi movie can be run through Registax, aligned and stacked for a cleaner all-sky image:

Using a planetarium program, like TheSky6, an all-sky view of the heavens can be generated to identify bright stars, constellations and planets visible at the time of the bolide capture or transient event.

Then using PaintShop Pro or another similar graphics package, the cleaned up image from the camera and the image from TheSky can be overlaid on each other as separate layers. By altering the opacity of the top layer it is possible to see TheSky6 image nicely blending in to the real sky image from the camera.

Using TheSky6 all-sky map also helps to identify and eliminate hot pixels in the camera that might otherwise be mistaken for bright stars.