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Improving the augmentable rating

July 4, 2013 - 4:29am #1

I know how to improve the augmentable rating if I am allowed the change anything I want about an image.

But, what about for images that have already printed, or are not controlled by me. My thinking is that since vuforia is working (i think) from relative "features" instead of directly from image data at runtime, then, there should be some types of improvements I could make to my images before uploading them to the manager...that increase the effectiveness of finding features...without changing those feature. Hope that makes sense.

For example adjusting the levels in photoshop is probably one lever we have.

Any best practices known or maybe even some PS scripts people have already made?

Improving the augmentable rating

December 15, 2016 - 11:51am #11

mmdk wrote:

404 page not found.

For the following page: https://developer.vuforia.com/resources/dev-guide/image-target-enhancement-tricks 

 

Note: The same page is linked to from: https://developer.vuforia.com/forum/faq/how-can-i-improve-detection-and-tracking-stability

Any chance of getting a new link or similar page, for a guide to enhance image target. 

 

Thanks in advance 

 

Nevermind, I found this guide.

https://library.vuforia.com/articles/Solution/Natural-Features-and-Ratings

Improving the augmentable rating

December 4, 2016 - 6:34am #10

404 page not found.

For the following page: https://developer.vuforia.com/resources/dev-guide/image-target-enhancement-tricks 

 

Note: The same page is linked to from: https://developer.vuforia.com/forum/faq/how-can-i-improve-detection-and-tracking-stability

Any chance of getting a new link or similar page, for a guide to enhance image target. 

 

Thanks in advance 

Improving the augmentable rating

July 29, 2013 - 8:19am #9

Ok, so I got from that that you guys will scale the image if it is smaller than 320 pixels in width, and that when you do anti-aliasing will occur, so if we don't want that we should upload only 320 pixel or wider images. But that doesn't say whether the image is being scaled to EXACTLY 320 width, basically scaled up if smaller and scaled down if larger. In the next section though, it says this:

Also the down-scaling of the image to the size of 320 pixels on the longer side on the Target Manager can destroy the effect of this operation, so it is important to scale down the image before this step.

I'm having issues creating a natural looking trackable, and I need to find the optimal resolution where no scaling will be occuring when I upload the image for processing so I can get the best results possible.

Improving the augmentable rating

July 29, 2013 - 8:02am #8

From our developer guide (https://developer.vuforia.com/resources/dev-guide/image-target-enhancement-tricks):

When the image is being uploaded to the Target Manager, we recommend scaling the image to be uploaded to 320 pixels or larger width. During the resizing process, anti-aliasing is performed on the uploaded image. This is perfectly acceptable for photos, however this may not always be desirable. To avoid having the anti-aliasing impact, ensure the uploaded image is 320 pixels in width.

 

Improving the augmentable rating

July 29, 2013 - 7:31am #7

AlessandroB wrote:

The image that you upload can be 320 x 320, of course, but it does not have to.

 

The main question is will it be scaled down to 320 width?

Improving the augmentable rating

July 29, 2013 - 7:02am #6

The image that you upload can be 320 x 320, of course, but it does not have to.

Improving the augmentable rating

July 29, 2013 - 6:39am #5

(Duplicate, forgot quote) I'm also wondering this too. Ideally, should the image targets always be 320x320?

Improving the augmentable rating

July 29, 2013 - 6:37am #4

duncanx wrote:

From reading those pages I had a question about upload resolution. Is 320 pixels the minimum viable resolution for an image...or...is it the resolution that will always be used?

For example if I upload an image that is 64x64, I understand that it will be resized for me to 320x320 (and probably be a terrible imagetarget). 

But, if I upload an image that is 1000x1000, will the processor use that or downsize it to 320x320?

 

I'm also wondering this too. Ideally, should the image targets always be 320x320?

Improving the augmentable rating

July 4, 2013 - 9:07pm #3

From reading those pages I had a question about upload resolution. Is 320 pixels the minimum viable resolution for an image...or...is it the resolution that will always be used?

For example if I upload an image that is 64x64, I understand that it will be resized for me to 320x320 (and probably be a terrible imagetarget). 

But, if I upload an image that is 1000x1000, will the processor use that or downsize it to 320x320?

Improving the augmentable rating

July 4, 2013 - 8:56am #2

Hi,

yes, there are certainly many ways of enhancing an image before uploading it to the Target Manager;

an example is to increase the local contrast, but there are many other aspects to be taken into account, and so in general you always have a certain room for improving the image rating;

the developer guide explains very extensively the feature rating concepts and it has a dedicated section about how to enhance your images;

I encourage you to have a read at these two pages:

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

https://developer.vuforia.com/resources/dev-guide/image-target-enhancement-tricks

I hope this helps.

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