[aprssig] APRS Multi-Mode Tracker
scott at opentrac.org
Sun Mar 4 21:41:11 CST 2007
>JPG is only intended for continuous-tone images; i.e. photos. It applies
image compression by looking for gradual gradients of brightness and color
from groups of adjacent pixels.
Actually, it generally transforms the image to a YCbCr color space, applies
chroma subsampling, then performs a discrete cosine transform on each 8x8
pixel block in each channel, quantizes the resulting coefficients, and uses
entropy coding to store them with run-length encoding and Huffman
compression. But yeah, it makes straight lines and edges look fuzzy. =]
> 2) What you are striving for is not a "multimode tracker" but a
full-function APRS station that happens to be mobile. The commonly-accepted
usage of the term "Tracker" is for a dumb (or should I actually say deaf")
transmit-only mobile that spews out posits periodically and can't receive
The Tracker2 does pretty well for mixed PC and standalone operation. I
haven't implemented a GPS pass-through yet, but I could.
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