Barcode recognition and No matter what picture is placed, the idMatrix in the result is 0?

[maryjoohn]

const cameraPara = new ARCameraParam('./camera_para.dat',function(){
const arController = new ARController(window.innerWidth, window.innerHeight, cameraPara);
arController.addEventListener('getMarker', function (ev) {
console.log('found marker?', ev);//No matter what picture is placed, the idMatrix in the result is 0?
});
arController.process(v1);

},function(){
console.log('error')
});