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Oct 05, 2015, 11:41 PM
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Odroid XU4 plans

The decision was made to pump $110 on an Odroid XU4. Reality was a bit higher than the $75 price quote because of $10 shipping, $7 tax, $7 for an SD card, $11 to ship & tax the SD card. It was already known the droid could only use the 4 Cortex A15 cores with the 4 A7 cores inoperable.

There are no definitive comparisons between the PI 1, PI 2, & the Odroid XU4 or any clear descriptions of what benchmarks they used. You can only estimate a single core of the Odroid is 3x faster than a single core of the PI 2, which is 2x faster than the PI 1. With all 4 cores, the Odroid would probably give 24x the framerate.

Based on the last optimizations, 160x120 would go at 72fps. 240x180 would go exactly at 30fps. 320x240 would go at 15fps. It brings back memories of spending a fortune on a 600Mhz single core Gumstix, just to use a neural network. It was so fast for its size, but less than a PI.

The chroma key & line detection were confirmed as the slowest parts. Since the algorithm can't be done in parallel, a frame pipeline with a 100ms latency would be best. The mane benefit is from averaging multiple frames rather than lowest latency. Changes in lighting & camera angle may provide more benefit than higher resolution from a single position, so you want to maximize the framerate before maximizing resolution.

An attempt to use linear regression to get the chroma key pixel didn't work. The simplest average algorithm here continued to be the best.
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