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Cloud response - indication of match / multiple response

February 21, 2019 - 8:11am #1

I have been testing with the cloud reco service and it is working great. Although I thought in the past there was a response indicating the matching score and get multiple responses with the best match as the first result.

 

Currently we do get quite a few false positives which we can't build a proper response around as we don't know what the matching quality is and I rather serve result nr 2 and 3 as well.

Is there a way to get this back in place?

Cloud response - indication of match / multiple response

February 28, 2019 - 2:05pm #4

Hello,

dhenst wrote:

I understand it is an image recognition service only, that is why I am using it. But the quality of recognition is getting quite poor when we add a large amount of photos.

Many false positives and I would like to see the reco_rating.

Normally, false positives can be traced to similar images in the Cloud Reco database. We offer an API to check for these:

https://library.vuforia.com/articles/Solution/How-To-Use-the-Vuforia-Web-Services-API.html#How-To-Check-for-Duplicate-Targets

The duplicate target check VWS API will analyze a cloud database for similar and/or duplicate images. It will return target IDs (up to 16 results) that the cloud recognition service deems as similar enough that they *may* be matched during cloud queries. The list is sorted in order of the internal confidence of similarity. We do not expose the confidence values as they are meaningless outside of our algorithm.

The duplicate analysis will occur on an entire image's content, not just the subject matter. For example, if an image of a soda bottle appearing in front of a busy background is submitted for duplicate check, it may not match a similar image of the same bottle in front of a plain background. This is because elements from the background are also being analyzed, in addition to the bottle itself.

dhenst wrote:

If I am not wrong I got this response in the API some time ago but now it is not available anymore?

Per our development team, this field was never officially populated. The primary reason is that a rating's value can be ambiguous and may not fit all use cases.

Thanks,

Vuforia Engine Support

Cloud response - indication of match / multiple response

February 26, 2019 - 11:49pm #3

I understand it is an image recognition service only, that is why I am using it. But the quality of recognition is getting quite poor when we add a large amount of photos.

Many false positives and I would like to see the reco_rating. If I am not wrong I got this response in the API some time ago but now it is not available anymore?

I would like to see how confident Vuforia is with the photos I am sending over and see if we can tweak this a bit.

Cloud response - indication of match / multiple response

February 21, 2019 - 12:09pm #2

Hello,

The Vuforia Web Query API, https://library.vuforia.com/content/vuforia-library/en/articles/Solution/How-To-Perform-an-Image-Recognition-Query.html, provides a list of up to 10 image matches sorted by order of confidence. Note that using the Web Query API means you will not be able to provide 6DoF tracking experiences for the target - it is strictly an image recognition service.

The Vuforia Web Service API has a field for reco_rating in some responses, but this field is populated as an empty string at this time.

Thanks,

Vuforia Engine Support

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