im new to augmented reality but what is meant by the term marker ? i have done a web search and it says the marker is a place where content will be shown on the mobile device but im not clear still. Here is what i found out so far:
Augmented reality is hidden content, most commonly hidden behind
marker images, that can be included in printed and film media, as long
as the marker is displayed for a suitable length of time, in a steady
position for an application to identify and analyze it. Depending on
the content, the marker may have to remain visible.
There are a couple of types of marker in Vuforia, there are ones you define yourself, after putting them in to they CMS online, ones that you can create at run time and set markers that just have information around the edge. They are where your content will appear. You can see a video here where my business card is the marker and the 3d content is rendered on top. http://youtu.be/MvlHXKOonjI
When the app sees the marker it will work out the pose (position and rotation) of the marker and apply that to any 3d content you want to load, that way as you move around date marker the content stays in the same relative position to the marker.
And one final heads up, this is much easier in Unity 3D than using the iOS or Android native versions. I've done quite a lot and it saves a lot of time.
Marker is nothing but a target for your Augmented Reality app. Whenever you see your marker through the AR CAMERA, the models of your augmented reality app will be shown on!
It will be easy to understand if you develop your first app in augmented reality! :)
TLDR: Augmented Reality markers ~= Google Goggles + Activator
AR markers can be real-world objects or locations that trigger associated actions in your AR system when identified in sight, and usually result in some action, like displaying annotations (à la Rap Genius for objects around you).
Example:
Imagine you are gazing through your AR glasses. (You will see both what is displayed on the lenses, if anything, as well as the world around you.)
As you drive by a series of road cones closing the rightmost lane ahead, the AR software analyzes the scene and identifies several road cones in formation. This pattern is programmed to launch traffic notification software and, in conjunction with your AR's built-in GPS, obtains the latest information regarding what is going on here and what to expect.
In this way, the road cone formation is a marker: something particular and pre-defined triggers some action: obtaining and providing special information regarding your surroundings.
Related
Using arcore and/or sceneform, would it be possible to place circles accurately on a real life object. Lets say i had a real world table and a known set of coordinates where small ( 10mm ) AR "stickers" need to be placed. They could be on the top/side/underside of the table and need to be placed accurately to the mm. I am currently solving this problem with a number of fixed mounted lasers. would this be possible to accomplish using arcore on a mobile device - either a phone or AR/smart glasses? Accuracy is critical so how accurate could this solution using arcore be ?
I think you may find that current AR on mobile devices would struggle to meet your requirements.
Partly because, in my experience, there is a certain amount of drift or movement with Anchors, especially when you move the view quickly or leave and come back to a view. Given the technologies available to create and locate anchors, i.e. movement sensors, camera, etc it is natural this will not give consistent millimetre accuracy.
Possibly a bigger issues for you at this time is Occlusion - currently ARcore does not support this. This means that if you place your renderable behind an object it will still be drawn in front of, or on top of, the object as you move away or zoom out.
If you use multiple markers or AR "stickers" your solution will be pretty precise considering your location of your circles will be calculated relative to those markers. Image or marker based tracking is quite impressive with any Augmented Reality SDKs. However, having these markers 10mm can cause problems for detection of markers. I would recommend creating these markers using AugmentedImageDatabase and you can specify real world size of the images which helps for tracking of these images. Then you can check if ARCore can detect your images on the table. ARCore is not the fastest SDK when it comes to detecting images but it can continue tracking even markers are not in the frame. If you need fast detection of markers i would recommend Vuforia SDK.
I am very new to android, and I basically have almost no experience. Recently my client got an idea where he wants to have a custom map (in .png/.jpg/.jpeg format) on which, using GPS only, will be displayed his location using a marker, and location where he is supposed to get. Those two markers have to be connected with a "path", that will be like some sort of navigation from one marker to another. One of the requests is that it must be done without any usage of Google maps. My question here is - is that even possible to be done like this?
The only idea that I got is to get coordinate from GPS, make a proportion pixels on the image to coordinates and put a marker on where the user is supposed to be. Is there a better option than this?
I think you can try out this method in the below link.
Which can turn your images into interactive map layers that can be displayed in websites, used in mobile phones, tablets, GPS devices, map mashups or opened in the desktop GIS software, Google Maps or Google Earth.
http://www.maptiler.com/
I have quite strange augment reality case to implement. Most AR frameworks I've found can be classified on 2 groups:
GPS based ones
Based on visual markers (something like a QR code) located in real world.
Basically here is a list:
AndAr https://code.google.com/p/andar/
Mixare https://code.google.com/p/mixare/
DroidAr https://code.google.com/p/droidar/
But this does not fit my case, in simple words, I do need to place visual marker flying in a room near by one or several physical assets. I do have all needed coordinates, but I don't sure how I can show marker flying 2 meters in front of a phone, because all above mentioned frameworks positioning api based on degrees, minutes and seconds. Don't sure how I can correlate those 2 coordinates system.
I use BeyondAR for this. is small, simple, free and open source.
The Wikitude SDK allows you to put markers (so called GeoObjects) relative to a position. The position could be the user's position or any position defined by latitude, longitude, altitude (in your case this could be the initial user's position). The relative position is defined in meters north/east of the initial position.
For more information have a look at the documentation at: http://www.wikitude.com/external/doc/documentation/3.0/Reference/JavaScript%20Reference/index.html
It includes both Geo-based AR and Image Recognition & Tracking.
Disclaimer: I'm working for Wikitude
I use BeyondAR for this. is small, simple, free and open source. Here the linke
BeyondAR Framework
I am working on an Augmented Reality app that requires image tracker placed at a distant. A target would be a bill board or scoreboard in a basketball game. I have tried Qualcomm's Vuforia SDK, it seems it only works when the marker is placed within 3 feet from the camera. When you move further, I think it loses detail and AR engine is not able to recognize the tracker any more.
In theory, if the marker is large and bright enough, and with a clearly defined details and border markings for tracking purpose, should it not work?
Also, is there anyway for an AR app to recognize ANY flat surface like a table or hardwood floor with variety of colors and textures, as long as it's a flat surface. Typical applications would be virtual keyboard or chess board.
thanks,
Joe
AR is about recognition markers, not shape. AR engine input is image from camera and there is no way to determine shape from it, so answer for Your second question is: NO.
PS: In my case (iOS) default marker is detected from about 1,5m and can be tracked to about 4m. I think, that resolution of the camera is important thing and can affect on tracking effiency.
The experience we have is that a marker in the size of about 20x20cm is readable by the Vuforia SDK in about 5 meter distance. That seems to be the very limit.
i just need some guide on how to detect a marker and make an output text.. for ex: a marker with an image of a dog , when detected, i have an output text "DOG" in a textfield .. can someone help me with my idea? oh, btw which one is more effective to use nyartoolkit or andar for my idea?thanks:) need help..!
What you're looking for isn't augmented reality, it's object recognition. AR is chiefly concerned with presenting data overlaid on the the real world, so computation is devoted each frame to determining the position relative to the camera of the object. If you don't intent to use this data, AR libraries may be an inefficient. That said...
AR marker tracking libraries usually find markers by prominent features like corners, and can distinguish markers by binary patters encoded inside the marker, or in the marker's borders. If you're happy with having the "dog" part encoded in the border of a marker, there are libraries you can use like Qualcomm's AR development kit. This library, and Metaio's Unifeye mobile can also do natural feature tracking on pre-defined images. If you're happy with being able to recognize one specific image or images of dogs that you have defined in advance, either of these should be ok. You might have to manipulate your dog images to get good features they can identify and track. Natural objects can be problematic.
General object recognition (being able to recognize a picture of any dog, not known beforehand) is still a research topic. There are approaches, but they're mostly very computationally intensive, and most mobile solutions involve offloading the serious computation to a server. Recognition of simple outline sketches however is more tractable, there's a great paper called "Shape recognition and pose estimation for mobile augmented reality" (I can't find a copy online, but the IEEE link is here) that uses contours to identify objects - this is light enough to run on a mobile (and it's pure genius).