FLARSingleMarkerDetector Error

[greatxam]

Hi,

I got an error when I use custom marker. What I did is this:

var encoder = new FLARIdMarkerDataEncoder_RawBit();
var oReq = new XMLHttpRequest();
oReq.onload = function(e) {
var markerCode = new FLARCode(16,16);
markerCode.loadARPatt(oReq.response);

encoder.encode(markerCode,encoder.createDataInstance());
detector = new FLARSingleMarkerDetector(param, markerCode,80);

}
oReq.open("get", "pattern/custom_marker.pat", true);
oReq.send();

And on my render() function:

function render() {
var isDetected = detector.detectMarkerLite(raster,90); // error triggers here
...
}

Uncaught TypeError: Cannot read property 'length' of undefined JSARToolKit.js:137
c JSARToolKit.js:137
ASKlass.detectMarkerLite JSARToolKit.js:12100

I hope someone can help me with this. And thanks in advance.

[Phil23]

Do you already found a solution for creating custom markers?
I'm also working on an AR project and would realy appreciate your solution.

Thanks a lot!

[greatxam]

No I haven't find a solution. But there a Flash (as3) version that works using SingleMarkerDetector.

[Phil23]

I got it working. I just looked at the AS file and adapted it to JS.

http://www.libspark.org/svn/js/JSARToolKit/trunk/src/JSAR.as

[yuccai]

Hello Phil23
I just want to know if you've already found a solution to create your custom marker with JSARToolKit?
Thank you

[Phil23]

Hey,

yes, i finally got it to work. I found an example from the original java library and adapted it to javascript. But i had to fix some bugs in the JSARToolKit to make it work, which was hard to figure out. I did not find the time to commit my changes yet.

[duxan]

Hi all,

The problem was in detectMarkerLite under FLARSingleMarkerDetector, in JSARToolKit.js.

1st. On line 12098 FLARRasterFilter_Threshold was not instantiated and is not needed

detectMarkerLite : function(i_raster,i_threshold)
  {
    FLARRasterFilter_Threshold(this._tobin_filter).setThreshold(i_threshold);
    //サイズチェック
    if(!this._bin_raster.getSize().isEqualSize_NyARIntSize(i_raster.getSize())){
      throw new FLARException();
    }
    //ラスタを２値イメージに変換する.
...

should be:

detectMarkerLite : function(i_raster,i_threshold)
  {
    this._tobin_filter.setThreshold(i_threshold);
    //サイズチェック
    if(!this._bin_raster.getSize().isEqualSize_NyARIntSize(i_raster.getSize())){
      throw new FLARException();
    }
    //ラスタを２値イメージに変換する.
...

2nd. On line 9841 BUFFER_FORMAT was not accessible

isEqualBufferType : function(i_type_value)
  {
    return BUFFER_FORMAT==i_type_value;
  }

should be:

isEqualBufferType : function(i_type_value)
  {
    return this.BUFFER_FORMAT==i_type_value;
  }

Custom markers now work for me!
I-ll file pull request later today if someone want it compiled.

Cheers!

[kig]

Awesome, thanks!

On 2 July 2015 at 11:41, Dušan Ranđelović [email protected] wrote:

Hi all,

The problem was in detectMarkerLite under FLARSingleMarkerDetector, in
JSARToolKit.js.

1. On line 12098 FLARRasterFilter_Threshold was not instantiated and
   is not needed

detectMarkerLite : function(i_raster,i_threshold)
{
FLARRasterFilter_Threshold(this._tobin_filter).setThreshold(i_threshold);
//サイズチェック
if(!this._bin_raster.getSize().isEqualSize_NyARIntSize(i_raster.getSize())){
throw new FLARException();
}
//ラスタを２値イメージに変換する.
...

should be:

detectMarkerLite : function(i_raster,i_threshold)
{
this._tobin_filter.setThreshold(i_threshold);
//サイズチェック
if(!this._bin_raster.getSize().isEqualSize_NyARIntSize(i_raster.getSize())){
throw new FLARException();
}
//ラスタを２値イメージに変換する.
...

1. On line 9841 BUFFER_FORMAT was not accessible

isEqualBufferType : function(i_type_value)
{
return BUFFER_FORMAT==i_type_value;
}

should be:

isEqualBufferType : function(i_type_value)
{
return this.BUFFER_FORMAT==i_type_value;
}

Custom markers work for me!
I-ll file pull request later today if someone want it compiled.

Cheers!

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[rawatrob]

Hi @duxan, Thanks for it, I have try but didn't get any success can you please share a demo project which have custom marker please share or suggestion

[kalwalt]

@rawatrob see #9