"We offer new support options and therefor the forums are now in read-only mode! Please check out our Support Center for more information." - Vuforia Engine Team

marker source image size question

By schreibtisch on Wed, 06/20/2012 - 17:09
I have a very big marker ( 2m by 1m). I read in some faq that it is wise to use an image that is close to the one that is put into vuforia - basicly the camera image size. thing is, i have a scene like a window into something ( and also extending into userspace from the marker). this means that the user will look at the marker from all angles and especially distances. i tried an image thats 1000px and one thats 2000px but i got the same tracking quality and the yellow crosses seem identical. since i can walk close to the marker I thought that a higher res image would provide a better tracking because of its resolution (when closer). Is there a difference ? Simon

There is a limit to the number of features that can be handled per target, so at some point higher resolution doesn't buy you much. You may want to consider breaking your large target into several subtargets and stitching them together to form a multi target.

DavidBeard

Fri, 02/24/2012 - 17:43

Permalink

Also increasing the resolution of an image isn't going to have any effect if the increase does not reveal additional details in the image that will be captured as features. This is probably the case w/ your comparison.

schreibtisch

Mon, 02/27/2012 - 09:22

Permalink

Thanks a lot. This is really a helpful place. You guys seem to care. Thank you. I have to deploy the project basicly tomorrow and i don't think i want to change the setup (multimarker) in a day because the client seems happy with the tracking.