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Wall and Ceiling as trackables

June 7, 2011 - 5:12pm #1

Hi,

Consider walls and ceiling of home as trackables in an application developed using Qualcomm's AR SDK.

Suppose, I take picture of wall in Day time in sunlight and convert it using online trackables. Will I be able to use the this trackable image any time Evening or nights when lights/bulbs inside home are on or is there limitation to the amount of light ?

Thanks,
NGarach

Re: Wall and Ceiling as trackables

June 9, 2011 - 12:59pm #9

Hi NGarach,

Does your wall have a pattern on it? A solid color wall will not track well if at all. The best ImageTargets have an even distribution of detection points across the entire image. Try uploading some images to the TMS to get an idea for what images work well.

To answer your question. If your wall has lots of patterns on it, upload a scan of it to the TMS. If it receives 3 or more start then what you describe is not a problem. If your wall produces only 1 or 0 stars in the TMS, what you describe will not work.

You may be able to achieve what you want by registering the posters instead of the wall. As long as the poster is in the field of view of the camera you can have augmentation on the wall.

Thank you,

-Peter

Re: Wall and Ceiling as trackables

June 9, 2011 - 12:46pm #8

Suppose initally I have two posters on wall. I take image of this wall and convert it using TMS and use it as trackable in my application.

Suppose someday I hang one more poster on the wall. My application has image with 2 posters but same wall has three posters now.

Can QCAR still recognize the wall even if the number of posters has increased ?

Re: Wall and Ceiling as trackables

June 9, 2011 - 10:04am #7

Hello NGarach,

You may want to look at using those posters on your walls as targets. The posters will probably track better.

-Peter

Re: Wall and Ceiling as trackables

June 9, 2011 - 9:45am #6

Hmm, you're not going to be able to track an empty wall :)

QCAR works on features, it needs a feature-rich image to track. Take a look at the sample targets in the dev guide. Try uploading images to the TMS and looking at the feature points.

- Kim

Re: Wall and Ceiling as trackables

June 9, 2011 - 9:31am #5

If there are no posters, artwork etc on wall initially when I create image using TMS but later when I use my application I hang some posters/artwork.

Would these posters and artworks block the identification of wall or make difficulty identifying the wall?

Re: Wall and Ceiling as trackables

June 9, 2011 - 5:45am #4

There really isn't a way to handle shadows, you want the lighting to be even if possible.

If your walls are a solid color but covered in artwork, posters, etc. I might suggest making targets of the individual pieces on the walls. You could combine these into a multi target describing the offset between each.

- Kim

Re: Wall and Ceiling as trackables

June 8, 2011 - 9:30am #3

Thanks Ksiva.

Is there a way to handle shadows ?

Can I feed clean 2D image of individual walls of a room instead of whole room to TMS to create a trackable and get the better tracking performance ?

Re: Wall and Ceiling as trackables

June 7, 2011 - 8:48pm #2

The tracker works best in good, even lighting. That said, you should be able to track in both daylight and artificial light. Evening and shadows might cause problems.

I'm not sure how well tracking the walls and ceiling of a room is going to work though. QCAR is really meant for tracking feature-rich print, and typically you would feed a clean 2D representation of the image to the TMS to create a trackable. A photograph of your room will probably not result in the best tracking performance.

- Kim

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