Petwe

I'm building a live video chromakey thingy, where it should be possible to grab a physical object in a color and track it, so that that object becomes a 3d object on the live video.

So far it's going good, but I want to project it on a wall, therefore in full screen. I have used the patch to color track from Robert Ramirez in this thread 

https://cycling74.com/forums/augmented-reality-need-help-to-insert-3d-models-into-live-video-feed.

 The problem is that when I go full screen in both Robert Ramirez patch and my patch with live video, the color tracked object stays in the upper left corner.

I believe the problem is that the coordinates from the color tracker is from 320 to 240. Could this be the problem? And how do I fix it?

So far it's going good, but I want to project it on a wall, therefore in full screen. I have used the patch to color track from Robert Ramirez in this thread https://cycling74.com/forums/augmented-reality-need-help-to-insert-3d-models-into-live-video-feed. The problem is that when I go full screen in both Robert Ramirez patch and my patch with live video, the color tracked object stays in the upper left corner.

I believe the problem is that the coordinates from the color tracker is from 320 to 240. Could this be the problem? And how do I fix it?


color-tracking-coordinates-goes-wrong-when-viewing-full-screen

"I believe the problem is that the coordinates from the color tracker is from 320 to 240. Could this be the problem? And how do I fix it?"

Yes, this is the cause of the problem. The (quick) fix is to determine a ratio of pixels for fullscreen mode. In this hacked/modified version of the example patch by Robert, the scaling value for both the x and y co-ords is changed to 4.0 when the fullscreen toggle is a activated. This scaling value is not quite the right value for the fullscreen value on my machine (=1440x900 - and quite probably not on yours either) - the original image is somewhat stretched in fullscreen mode anyway as the ratio of width to height of the fullscreen image is not 4:3 (320:240). I't will be up to you to determine the best ratio(s) for your uses, but I would suggest working to the least distorted image in fullscreen if that is your final destination.

Yes, this is the cause of the problem. The (quick) fix is to determine a ratio of pixels for fullscreen mode. In this hacked/modified version of the example patch by Robert, the scaling value for both the x and y co-ords is changed to 4.0 when the fullscreen toggle is a activated. This scaling value is not quite the right value for the fullscreen value on my machine  (=1440x900 - and quite probably not on yours either) - the original image is somewhat stretched in fullscreen mode anyway as the ratio of width to height of the fullscreen image is not 4:3 (320:240). I't will be up to you  to determine the best ratio(s) for your uses, but I would suggest working to the least distorted image in fullscreen if that is your final destination.


jit.displays can also help determine overall size and screen proportion. then use [scale] to go from 320 x 240 to (whatever your screen is).

(didn't look at patches so maybe jit.displays is already there)

Or the screensize object. Just learned about that one recently.

Or the screensize object.  Just learned about that one recently.


color tracking coordinates goes wrong when viewing full screen