Vuforia external camera

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Vuforia external camera

Discussion in ' Vuforia ' started by frizzleMay 19, Search Unity. Log in Create a Unity ID. Unity Forum. Forums Quick Links. Come check them out and ask our experts any questions! Joined: May 19, Posts: 8. I have a simple uvc device i want to connect to my phone making an ar app using unity external camera functinality. Ive tested this device with several platforms including android and windows and simple uvc apps work fine on those platforms. Joined: Dec 8, Posts: The Unity project then specifies using the same style call as used in native in C giving the name of the driver library.

Thanks, Vuforia Engine Support. Ok ru available on discord? Im not sure it setup properly end to end. Firstly i just made a script to initilize the vuforia engine after the driver Library change which i used from the uvc sample project driver and this allowed the camera on my device to stop being called so now its just black but with the uvc device im not seeing an image so i imagine there is more to this to change the ar camera video to use that driver properly.

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Hello, If you provide a sample project we can take a look. Last edited: May 23, Hello, OK thanks. Hopefully the team will be able to take a look in the coming week or so. SO ive been doing some investigation into the project and I made a few tweaks to the build graddle to include what is instructed and it seems to be building the app with the library files. Now i cant seem to get delayed initialization to work with the driver, using ; VuforiaUnity.

InitVuforia ; It just says after the app opens that Vuforia initialization failed which doesnt happen with setting the default driver with ""; VuforiaUnity.Camera calibration is the mechanism for estimating the parameters of the lens and image sensor of a camera. These parameters are known as intrinsics and extrinsics. These parameters can be used to measure the size of an object in real-world units, correct lens distortion, or determine the location of the camera in a specific frame of reference.

vuforia external camera

Camera calibration is not necessary, but when provided will significantly improve the functionality of Vuforia Engine. Vuforia Engine uses the intrinsics and the distortion parameters to improve performance of detection and tracking. This procedure will require a Camera calibration tool.

There are various tools available for use. Below are some options for camera calibration tools:.

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This outlines the procedure to calibrate an external camera for the Vuforia Engine Driver Framework. The External Camera feature requires the following parameters to be obtained through the calibration process. A calibration template must be printed in order to perform the calibration. Please refer to the specific calibration tool instructions for information on which template to use. In order to calibrate the camera, images need to be captured using the camera.

Capture software which is supplied with your camera can be used to capture frames. Images can be captured using compressed formats such as JPG, but ensure that the images look sharp and do not contain excessive amount of compression artefacts.

Once calibration frames are captured, the frames must be processed in the tool of choice. After completing the camera calibration, the frame size, focal length, principal point and distortion parameters are reported. These values are used from within the Driver. Once the calibration data has been obtained, the Driver needs to be updated and provide the camera intrinsics to Vuforia Engine through the CameraIntrinsics structure.

For more information on building a custom driver, please refer to Creating a Custom Driver. The distortionCoefficients requires 8 values. If the tool does not provide them, use a value of 0. For more details on the mathematical details behind camera calibration and more understanding of the intrinsics and distortion models, see the OpenCV Camera Calibration Tutorial.

External Camera Calibration. Process Outline Print calibration template file Capture camera frames Process camera frames in Camera Calibration Toolbox Update the custom driver with calibration results Prerequisites Your preferred Camera calibration tool A method of capturing Frames from the camera or device A way to print a PDF file — preferably with stiff backing This procedure will require a Camera calibration tool.

Calibration Instructions This outlines the procedure to calibrate an external camera for the Vuforia Engine Driver Framework.

Frame size, 2 integer numbers for width and height in pixels Focal length, 2 floating point numbers for x and y distance between focal point and the image plane in pixels Principal point, 2 floating point numbers for x and y center of the image in pixels Distortion values, floating point numbers representing radial and tangential distortion in camera frame For more information, please refer to the CameraIntrinsics structure section below.

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Print calibration template A calibration template must be printed in order to perform the calibration. Printing considerations: Template size should be at least A4 Print the template on a rigid foam board or mount the printout on a flat, rigid surface such as a sheet of glass, foamboard, an aluminum sheet or a plexiglass sheet.

Take care not to introduce kinks, ripples or distortions Capture images In order to calibrate the camera, images need to be captured using the camera. Capturing Calibration Frames Specify the camera frame size in the application used to capture the images. Different frame sizes will have different camera parameters; therefore, the specified frame size used in the calibration process must be the same frame size that will be used by the Driver in Vuforia Engine.

Capture 20 or more images of the checkerboard from different distances and angles as shown below. For best results during calibration, ensure the following when capturing the images: The template goes right into the corners of the image in some views. The template is completely visible in every image and has a white border.This article describes the different focus modes available in Vuforia Engine since v1.

When setting this mode, if the return value of setFocusMode is TRUE your application will provide sharp camera images for both superior rendering, as well as for robust tracking performance.

Under certain conditions due this focus logic the tracking can be lost for a moment until a sharp image is provided again by the camera. HD camera view enables apps to request camera preview frames in HD. Supported devices include those that have a HD camera and screen, and quad core processors. This article describes two approaches for obtaining the camera image without augmentation in Unity:.

Register for the desired image format using the CameraDevice. SetFrameFormat method:.

vuforia external camera

Note : The Vuforia Namespace Reference page lists the available pixel formats. Call this method after Vuforia Engine has been initialized and started; to this aim, it is recommended to register an OnVuforiaStarted callback in the Start method of your MonoBehaviour script, e. Instructions: Attach this script to a GameObject in your AR scene and check the logs in the Console to see the captured Image information:.

The Image class provides the camera pixels as a byte array. You can obtain the image as an OpenGL texture using the approach demonstrated in the OcclusionManagement sample.

This article explains how to extract one of the images provided by the Vuforia Engine, using a desired image format.

If you are using Vuforia Engine 2.


In this case, if you open the VuforiaSamples sample, and find the ImageTargets. Also, the Frame Format can be set toi the desired one e. If you are using an older version of Vuforia Engine prior to 2. Note: This is not how OpenGL does it per default, but since it is just matrix math, we can do whatever we want here.

The coordinate frame is just rotated by 90 degrees around the x-axis. For targets:. This option can be helpful if the developer uses an existing rendering solution that enforces a different convention.

In this case the Vuforia pose conversion to GL modelview matrices will need to be implemented to suit that convention. This article describes the various camera parameters exposed by Vuforia Engine and how to use them. Vuforia Engine sets up a camera sitting at the origin, pointing in the positive Z direction, with X to the right, and Y down. For details on this coordinate system, see this article:. The projection matrix is created using device-specific camera parameters.

Sometimes it is necessary to find the field of view of the camera, especially when integrating with third party rendering engines.Datasets are created using the Vuforia Target Manager. While the Vuforia engine is running, it takes exclusive ownership of the camera it is using. This impedes the ability to also use that camera image data in alternative visual processing algorithms. However, periodically at a rate of tens of Hzthe Vuforia engine makes available Frame s containing snapshots from the camera, and through which camera image data can be retrieved.

These can optionally be retrieved through the frame queue. To access these Frame s, call setFrameQueueCapacity int to enable the frame queue. Once enabled, the frame queue can be accessed using getFrameQueue and the methods thereon used to access Frame s as they become available.

When setFrameQueueCapacity int is called, any frame queue returned previously by getFrameQueue becomes invalid and must be re-fetched. Note that calling this method invalidates any frame queue retrieved previously through getFrameQueue. Skip navigation links. The VuforiaLocalizer interface provides an interface for interacting with subsystems that can help support localization through visual means. CameraDirection VuforiaLocalizer.

CameraDirection enumerates the identities of the builtin phone cameras that Vuforia can use. CloseableFrame exposes a close method so that one can proactively reduce memory pressure when we're done with a Frame. Parameters provides configuration information for instantiating the Vuforia localizer. Advanced Returns information about Vuforia's knowledge of the camera that it is using. Advanced Calls the indicated code with a frame from the video stream, exactly once.

Advanced Returns a queue into which, if requested, Vuforia Frame s are placed as they become available. Loads a Vuforia dataset from the indicated application asset, which must be of type.

Loads a Vuforia dataset from the indicated file, which must be a. XML file and contain the full file path. Advanced Sets the maximum number of Frame s that will simultaneously be stored in the frame queue. The corresponding. DAT asset must be a sibling. Note that this operation can be extremely lengthy, possibly taking a few seconds to execute. Loading datasets from an asset you stored in your application APK is the recommended approach to packaging datasets so they always travel along with your code.

DAT file must be a sibling file in the same directory. Provides access to the Camera used by Vuforia. Will be null if a built-in camera is in use.During runtime, Vuforia Engine loads the library and uses it as a data source e.

We are mainly interested in the Driver. This file defines several functions and classes which must be extended by the custom driver. For more information, refer to the comments in Driver. The driver provides camera frames to Vuforia Engine through a callback class. The driver provides pose data to Vuforia Engine through a callback class. Driver implementation should first feed pose and then the matching camera frame.

Pose is optional and in such scenarios, driver implementation can just feed the camera frames. Vuforia Engine manages the lifetime of the driver by making function calls in the following order:. After the driver is compiled, it may be shared with other developers who want to use the external system. To use a driver within Vuforia Engine, the application developer must make the following call:. To disable an active driver and return to using default Vuforia Engine data capture mechanisms, pass a zero-length string to setDriverLibrary :.

Creating a Custom Driver. This constant is defined in Driver.

vuforia external camera

The driver developer selects a version value that is non-empty and generally under 50 characters long e. The memory and lifetime of this object is owned by the library. Object should remain valid until destroyExternalCamera is called. Object should remain valid until destroyExternalPositionDeviceTracker is called. The driver can support camera frames with corresponding device poses or camera frames only. There are two different capabilities supported by Vuforia Driver.

After calling open the supported camera modes must be available. Using a Driver in Vuforia Engine After the driver is compiled, it may be shared with other developers who want to use the external system. To use a driver within Vuforia Engine, the application developer must make the following call: Android Vuforia.

Vuforia::setDriverLibrary "CustomDriver.A sample of Vuforia ImageTarget detection without real camera. This uses locally stored images as camera images. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

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If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Previous Vuforia could not use local image files for camera images but from Vuforia 7.

This repository contains only a subset of the files in the Unity project. Because the files in the Unity project are too big and I did not want to include Vuforia's license key in this repository. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Sign up. Branch: master. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Git stats 1 commits 1 branch 0 tags.

Attach digital content to specific objects.

Failed to load latest commit information. View code. Significance Previous Vuforia could not use local image files for camera images but from Vuforia 7. How build FileDrive. You do not need a camera! Read images from files instead of actual cameras. About A sample of Vuforia ImageTarget detection without real camera. Topics unity vuforia externalcamera.Model Targets recognize objects by shape using digital 3D models.

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Place AR content on multiple objects from multiple views on a wide variety of items like industrial equipment, vehicles, and toys. Area Targets utilize 3D scans of a location and are designed for experiences in large, indoor spaces. From retail stores to factory floors - place content anywhere in your environment. Image Targets are the easiest way to put AR content on flat objects such as magazine pages, trading cards and photographs.

Multi Targets are for objects with flat surfaces and multiple sides, or that contain multiple images. Product packaging, posters and murals all make great Multi Targets. Cylinder Targets enable you to place AR content on objects with cylindrical and conical shapes. Soda cans, bottles and tubes with printed designs are great candidates for Cylinder Targets. Object Targets are created by scanning an object.

They are a good option for toys and other products with rich surface details and a consistent shape. VuMarks allow you to identify and add content to series of objects. Want to make your app look like an X-Ray machine? How about night vision? Create your own shaders to implement sophisticated visual effects. Watch static images come alive in full motion video.

Vuforia Engine video playback makes it simple for videos to be played directly on target surfaces. Imagine a magazine page that acts like a touch screen.

With Vuforia Engine, that is possible. Create virtual buttons that your app can see and respond to on top of image targets in the real world. Special occlusion handling allows apps to display graphics as if they appear inside physical objects. Attach digital content to specific objects. Expand Your AR Experiences. Ground Plane Ground Plane allows you to attach content to horizontal surfaces such as floors and tables.

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Augmented Reality Tutorial: Multiple Camera Setup for Screenshot and Video Recording


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