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problem of recognise real building in CloudReco

April 6, 2013 - 5:57am #1

Hi Vuforia Moderator.

 

as i want to use your sample app (cloudreco) to recognize real building which was photo taken, and i uploaded this photo to targetmanager.

it is working very very fine for recognizing that building via scanning that photo.

 

But it is fail to recognize that building via scanning that real building.

 

what suggestion do you have for me to solve this problem ?

 

problem of recognise real building in CloudReco

April 7, 2013 - 10:59pm #5

Thanks for nice reply 

problem of recognise real building in CloudReco

April 7, 2013 - 5:15am #4

Hi,

the typical use case for Image Targets is to print the image (note: exactly the same image that you have uploaded to the Cloud or Device Database) on some support like a paper or plastic plate for instance; the, when you scan the printed image target with your device camera, Vuforia will try to match it with an image target on the Cloud (if you are using CloudReco) or in a device database.

I think the best would be to look at the videos in the sample pages, to see how image targets work in practice:

https://developer.vuforia.com/resources/sample-apps/image-targets-sample-app

https://developer.vuforia.com/resources/sample-apps/cloud-recognition-sample-app

 

Concerning the type of algorihtms used for detection and tracking, this is mostly confidential; what we can say from a high level perspective is that images are recognized and tracked based on the presence of a certain number of natural features in the images,  as explained here:

https://developer.vuforia.com/resources/dev-guide/natural-features-and-rating

and here:

https://developer.vuforia.com/resources/sample-apps/image-targets-sample-app

Hope this helps.

 

 

problem of recognise real building in CloudReco

April 6, 2013 - 9:50pm #3

 

as i want to use your sdk (mainly cloudReco) on my final year project in university, i need to present your technology to my schoolmates and professors. 

 

how can you compare the the captured frame and the photo in your Cloud database, finally, find out the matching target ?

are you comparing photo with target using color distribution , histagram comparison, object feature on the photo, special outline of oject on the photo ?

 

I know something is your confidential,  can you tell me what any general image processing techonology or algorithm in the cloudReco ?

problem of recognise real building in CloudReco

April 6, 2013 - 10:28am #2

Hi,

recognizing a building can be quite challenging, because the picture that you took will always be a bit different from what you see in the real world;

in particular, outdoor lighting conditions might represent the biggest challenge, as well as the distance from the building (which may pose some issues with the ability of the camera to focus on it).

Note: this is not an ideal scenario to use Vuforia.

 

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