Archive for March 10th, 2018

SJCAM M20 vs. Cycliq Fly6 Resolution: License Plates

The Cycliq Fly6 has marginal resolution for license plates at anything other than lethally close distances and, after its recent battery failure and rebuild, I picked up an SJCAM M20 to see whether more dots would be useful.

The Fly6 records 1280×720 @ 30 fps, with somewhat high contrast and weird color balance:

Fly6 - Backlit license

Fly6 – Backlit license

It works better with a stationary target in good light:

Fly6 - Stationary license

Fly6 – Stationary license

The M20 records 1920×1080 @60 fps (among many other choices), with reasonable contrast and coloring:

M20 - backlit license

M20 – backlit license

Good lighting and no motion helps it along, too:

M20 - Stationary license

M20 – Stationary license

The original frames-grabbed-from-the-video aren’t visibly different from the JPGs you see here.

Collecting all the plates in one montage:

Fly6 vs M20 - License Plates

Fly6 vs M20 – License Plates

I enlarged the left pair by 200% and the right pair by 300%, using GIMP’s cubic interpolation, to make them large enough to see with the naked eye. The interpolation algorithm slightly smooths the edges, but the cameras put those weird compression artifacts / blobs in the original images.

The left pair also got auto-brightness adjustments to drag ’em out of the murk.

I saved the montage as a PNG, rather than a JPG, although JPG image compression made no difference.

All in all, the M20 has better image quality than the Fly6, but its 1.5× higher resolution isn’t a slam-dunk win and, IMO, video compression has more effect than image resolution. The Fly6 has no compression controls and I’ve set all the M20 controls to as good as they can be.

Both those license plates sport NYS’s now-obsolete high-contrast blue-on-white color scheme: the current blue-on-gold NYS plates have much lower contrast. In this age of ubiquitous license plate reading and storing, I cannot explain why this was allowed to happen.

The Fly6, now equipped with a high-quality 18650 lithium cell, should have more hours of run time than I can measure this early in the season. Perhaps six hours, with its red blinky LED at full throttle, according to the doc.

The M20 lasted 72 minutes with a freshly charged battery, which means it didn’t quite survive the trip. Performing battery maintenance in the middle of a ride for groceries isn’t appealing; I should conjure an external 18650 battery pack for the thing.


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