Describe the bug
Not sure if it is a bug or expected behaviour. The resolution of the camera is pretty low, ranging from blurry to very pixelated depending on the phone used (I tested on an iphone 6s, iphone 8 and a brand new huawei).
To Reproduce
My code is the same as the README, except to the changes made to the <a-box>.
Expected behavior
Crisper camera, I guess.
Screenshots

Smartphone:
try another random web demo using the mobile camera, to see if there are differences. like: https://davidwalsh.name/demo/camera.php
In this demo you sent me it looks much better. I tried using <a-marker-camera> and <a-camera-static> but they had the same results. I haven't tried using just a normal video element because I assumed that the whole camera logic would be gone. I thought it might be like this because the video is covering the entire screen but in that case older phones should have it worse, right?
Ok I found the way to change that parameter:
on the a-scene, parameter 'arjs', set this:
sourceWidth:1280; sourceHeight:960; displayWidth: 1280; displayHeight: 960;
defaults are here (640 and 480 pixels): https://github.com/jeromeetienne/AR.js/blob/master/three.js/src/threex/threex-artoolkitsource.js
That did the trick! I must have missed those options in the documentation. Thank you 馃槃
Which documentation 馃槃
I meant this section of the /aframe README, the attributes were there and I didn't notice :B
Most helpful comment
Ok I found the way to change that parameter:
on the a-scene, parameter 'arjs', set this:
sourceWidth:1280; sourceHeight:960; displayWidth: 1280; displayHeight: 960;defaults are here (640 and 480 pixels): https://github.com/jeromeetienne/AR.js/blob/master/three.js/src/threex/threex-artoolkitsource.js