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How large can an image target get?

February 22, 2013 - 12:44pm #1

Hi,

I'm interested in doing large scale AR projects and wondered how large an image target can get. I'm working under the assumption that it's best to work on a 1 to 1 scale with an image target. What i mean is, if I make an image target that is a standard letter size image, 8.5 x 11, then it's best to use an 8.5 x 11 print out as the image target. However, how much can I scale the print out up or down and it still works as an image target?

Also, I noticed that there is a file size limit of 2.4 mgs that I can upload to make an image target. In order to balance the quality of the image for print and the size of the image target, I've been able to make a 11 x 17 image target print.

So, my main question is, given the file size upload limit, how large can I scale up my 11 x 17 before it starts to break down the image target data set? I'm looking at ways to AR large posters sized prints.

Or, am I looking at this the wrong way? Any numbers explaining the limits of the size of image targets would be greatly appreciated.

 

David

How large can an image target get?

July 3, 2018 - 3:32pm #8

DavidBeard wrote:

You can compose large flat targets using a MultiTarget by defining the configuration so that the faces are aligned to the same plane. This also enables the user to track the target from a greater range of distances - the MT will be trackable as long as one of the faces is trackable which enables the user to get closer to a large MT than they'd be able to with a single large ImageTarget. Also by using multiple images you can maintain higher image resolutions.

 

Are you talking about using a Cuboid shape here?

How large can an image target get?

March 14, 2013 - 9:59pm #7

So, I tried this technique and it didn't work like I had thought it would in that it didn't work. I thought this was more of a way to stitch a much bigger image target out of mulptiple ones, but when I tried it with a static model as a test, it would only attach to image target at a time.

How large can an image target get?

February 24, 2013 - 11:18am #6

Ok. I'm a dunce. The xml file wasn't as intimidating as I thought. Figured out how to re-arrange the MT config. Thanks DavidBeard for the help.

 

David

How large can an image target get?

February 24, 2013 - 10:29am #5

Thanks DavidBeard,

You were right. It didn't occur to me until after that I needed to make a MT target in the Manger first. I just did that. Would you mind talking a little more about the XML config file? What specifically I would need to do with it. A setp by step would be great. For example, currently in the Target Manager, the MT arrangement is in an upside down lower case "t" arrangement. If I want to re-arrange that into a different shape, like a right side up capital "T" arrangement what would I need to do to the config file. Keeping in mind that I"m only interested in using a MT in a flat configuration mounted on a wall.

I'm not a scriptor by any means, but I can copy and paste. hahaha.

Also, do "all" the images for the MT need to be present in order for it to work, or can I offset just the vertical images?

 

David

How large can an image target get?

February 24, 2013 - 9:55am #4

Did you generate the MT in the Target Manager? The Target Manager assumes that you're generating a cube or cuboid, so you'll need to add your images to one of those primitives and then revise the MT configuration XML file after you've imported it.

The MT is recognized as having an MSIT equivalent to the total of its faces.

To accomplish the alternative, using multiple ImageTargets, you'd need to offset the augmentation for each correctly so that it is in the correct relative position for each target. But the challence here is that if you use a MSIT > 1 there is the potential for rendering multiple instances of the same augmentation, which may cause rendering problems. This is another reason that I recommend using a MT.

How large can an image target get?

February 24, 2013 - 9:30am #3

Thanks for this answer. So, I tried setting up a MT and for some reason, when I tried to set up the Data Set it wouldn't take. Is there a trick to setting up the Data Set for MT?

Also, what is the difference for using a MT compared to setting the Max Simultaneous Image Target to let's say 2 or more? And by setting it to 2 or more, how do you set that up? Do you just place as many ImageTarget prefab into the Unity Scene? And if so, how do you tie in the 3D asset into those targets if you can only parent it to one image target?

Thanks,

David

How large can an image target get?

February 22, 2013 - 3:27pm #2

You can compose large flat targets using a MultiTarget by defining the configuration so that the faces are aligned to the same plane. This also enables the user to track the target from a greater range of distances - the MT will be trackable as long as one of the faces is trackable which enables the user to get closer to a large MT than they'd be able to with a single large ImageTarget. Also by using multiple images you can maintain higher image resolutions.

You don't need to maintain a 1:1 correspondence between the submiitted target image and its printed version. For example you can use a lower resolution / size for the target image and a much larger one for the printed target. The significant factor is going to be the correspondence between the apparent features of the targets, and thats going to change w/ distance. So it's often going to be necessary to do some testing to determine the possible near and far distances for the physical target. A good way to do this is to use a projector.

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