Log in or register to post comments

Image Target Pose Consistency

October 18, 2018 - 1:44pm #1

I'm working on some applications that require matching real world items to augmentations. I'm doing this by defining offsets from an image target. My issue is that the recognized pose of the target doesn't seem to be very consistent. Sometimes the augmentations relative to the target look great and another time, without changing anything, they're off by a couple inches. Looking at the target longer seems to help but it's not clear. I've seen this behaviour on iOS, Android, and HoloLens.

I've tried some different targets but the current one is 5"x3" and has a 5 star rating. It's not printed on glossy paper. The lighting is good and also out of my control.

I'm wondering if anyone has any tips for improving the consistency of the image target pose. Should I make the users keep the marker in view for 5 seconds? Any other techiniques?

Thanks!

 

 

 

Image Target Pose Consistency

October 26, 2018 - 9:20am #7

Hello @keselmld,

Please check out this post:

https://developer.vuforia.com/forum/model-targets/model-target-and-hololens#comment-65860

As we continue to investigate the issue above, we've found that it is likely not limited to just Model Targets. The issue has been observed for Image Targets, as well.

Can you attempt to recommended workarounds for HoloLens?

Note: When I attempted to replicate your issue, I *did not* try on HoloLens as your post mentioned it was observed on multiple platforms.

Thanks,

Vuforia Engine Support

 

Image Target Pose Consistency

October 22, 2018 - 1:48pm #6

Hi, thanks for checking it out.

 

I do follow the steps you've mentioned. In this case, the image is 5" wide, so I enter .127 (5" = 12.7cm) in the width field. I made sure the image is not scaled to fit the page and it measures correctly. I'm using a HoloLens currently on Unity 2018.2.10f1. I think it works fine about 95% of the time but sometimes it gets off, especially by rotation and gets stuck there for a bit... especially when I'm further away or looking from an angle.

Do you have a specific target you could recommend that's well tested? I could try that to see if my target is the issue or my setup. Or maybe it's just systematic.

 

Thank you

 

 

Image Target Pose Consistency

October 19, 2018 - 5:11pm #5

Hello,

I tried your target in a project running 7.5.26 (a patch release to 7.5.20) with Unity 2018.2.11f1. I used our Core Samples and replaced one of the targets, and printed the target to the size specifications that you mentioned. From my observations, tracking was stable and performant:

https://www.dropbox.com/s/dbuhmpneql9ivfe/2018_10_19_17_01_01%5B1%5D.mp4?dl=0

Two things you need to be careful of:

  1. When uploading the image to the Target Manager, it is highly recommended to specify the width dimension (in meters) to be the same as the target. In this case, the value would be 0.005 (or 5 cm). This is absolutely necessary for see-through eyewear, such as HoloLens
  2. When printing the target, be sure that the aspect ratio is maintained. Most printing software will attempt to fit the image to the paper it is being printed upon, skewing the aspect ratio. This will negatively impact tracking pose accuracy

Hope this helps.

Thanks,

Vuforia Engine Support

Image Target Pose Consistency

October 19, 2018 - 3:52pm #4

Hello,

Can you confirm that you are also using Unity? If so, which version?

Thanks,

Vuforia Engine Support

Image Target Pose Consistency

October 18, 2018 - 6:49pm #3

Hello, thanks for the reply.

 

I'm on version 7.5.20. The target is attached.

 

Thank you

AttachmentSize
Image icon omd_marker_1.jpg164.04 KB

Image Target Pose Consistency

October 18, 2018 - 2:57pm #2

Hello,

What version of Vuforia are you using? Can you share the target?

Thanks,

Vuforia Engine Support

Log in or register to post comments