I want to make a game where I need a square shaped matrix with 6 row and six columns.
How to do that?
Here is an iPhone compatible version of Apple's Geek Game Board sample code:
https://bitbucket.org/snej/geekgameboard/.
The original version can be found here (Mac only):
http://developer.apple.com/library/mac/#samplecode/GeekGameBoard/Introduction/Intro.html
It's using Core Animation and provides reusable classes for your problem.
Related
I have an app which uses AVFoundation and tracks the face, eyes, and mouth position. I use the CIFaceFeature to detect these and mark them on the screen.
Is there a simple way to detect a wink using the framework?
For iOS 7, Yes, now you can do it with CoreImage.
Here is the API diff in iOS 7 Beta 2:
CoreImage
CIDetector.h
Added CIDetectorEyeBlink
Added CIDetectorSmile
Before iOS 7:
No, there is no way with iOS frameworks (AVFoundation or CoreImage) for now.
You can check out with OpenCV... but it's more of a researchy topic, not guarantee to work well in different situations:
First, you need to build a eye close/open classifier, afaik, there is no build-in eye wink classifier in OpenCV, so you need to collect enough "close" and "open" samples, and train a binary classifier. (I would suggest using Principle Component Analysis + Support Vector Machine. Both are available in OpenCV)
Then in iOS, use CoreImage to detect the locations of both eyes. And cut a square patch image around the eye center. The size of the patch should be normalized in terms of the detected face bounds rectangle.
And then you need to convert UIImage/CIImage to OpenCV IplImage or CvMat format, and feed them into your OpenCV classifier to determine the eyes are open or close.
Finally, determine if there is a wink based on the sequence of eye open and close.
(You also need to check if the processing frame rate is able to pick a wink action: say the wink happens within 0.5 frame... then you'll never detect it...)
It's a hard problem... otherwise Apple would have already included them in the framework.
I have set up a Kinect device and written a simple program that reads the stream to a QImage using OpenNI 2.0. I have set up skeleton tracking with NiTE 2.0, so I have access to the coordinates of all the 15 joints. I have also set up a simple scene using SceniX. The hand coordinates provided by the skeleton tracking are beeing used to draw 2 boxes to represent the hands.
I would like to bind the whole skeleton to a (rigged)model, and cant seem to find any good tutorials. Anyone have any idea how I should proceed?
depending on your requirements you could look at something like this for Unity Engine https://www.assetstore.unity3d.com/en/#!/content/10693
There is also a Plugin for the Unreal 4 Engine called KINECT 4 UNREAL FROM OPAQUE MULTIMEDIA
But if you have to write it all by hand for yourself, i have done something similar using OpenGL.
I used Assimp http://assimp.sourceforge.net/ to be able to load animated Collada models and OpenNi with NiTE for skeletal tracking. I then used the rotation data from the Nite skeleton and applied it to the corresponding Bones of my rigged mesh, overwriting the rotation values of the animation. Don't use positional Data. It will strech your bones and distort the mesh.
There are many sources for free 3D Models, like TF3DM.com . I for myself used a custom Rig for my models to be suitable for my code. So you might look into using Blender and how to Rig a Model.
Also remember that the Nite Skeleton has no joint for the Pelvis, and that Nite joints don't inherit their parents rotation, contrary to the bones in a rigged model.
I hope this helps to have something to go on.
You can try DigitalRune, they have examples of binding a rigged model to joints. They have mentioned some examples too. try http://www.digitalrune.com/Support/Blog/tabid/719/EntryId/155/Research-Augmented-Reality-with-Microsoft-Kinect.aspx
Also you would need to know to animate model in blender and export it to XNA or to your working graphics framework. Eg:-http://www.codeproject.com/Articles/230540/Animating-single-bones-in-a-Blender-3D-model-with#SkinningSampleProject132
Why should you ever want something like this?
I want to track a single user that is mounted above the ground in a horizontal position. The user is facing downwards to allow free movement of legs and arms. Think of swimming for example.
I mounted the Kinect at the ceiling facing downwards so I have a free view of all extremities.
The sensor is rotated 90° in z-axis to have the maximum resolution (you're usually taller than wide).
Therefore the user is seen from the backside, rotated by 90°. It is impossible to get a proper skeleton from OpenNI 1.5. My tests showed that OpenNI is expecting the user facing the camera with the head up in y-axis (see my other answer). Microsofts SDK is the same but I excluded it here because it won't allow you to change the source code and cannot be adapted. OpenNI 2.0 is not working with the current SensorKinect to interface the Kinect in Linux. So:
Which class is generating the skeleton in OpenNI 1.5.x?
My best guess would be to rotate the prototype skeleton by y 180° and z 90°. If you know where I could find this.
EDIT: As I just learned there is no open source software that generates a skeleton from depth images so I fall back to the question in the header:
How can I get a user skeleton from a rotated back view?
I want to use 'marker reader' technology in my iPhone application (you have a piece of paper, you point the iphone camera at it and information is bein drawn up from it). What API kits can i use/are availible?
The closest SDK I can think of is ARToolKit which should help in a Framework Solution for finding Markers and deriving information. There are a couple of other Frameworks which could be used and I've listed below:
Layar
ARToolKit
Popcode
SGAREnvironment
i've written an algorithm to create electricity using ccDrawLine function in cocos2d for iphone. Currently, the ccDrawLine is a simple wrapper method for drawing openGL lines on the fly.
My algorithm is sound and works as I want. But the problem is with the appearance of the electricity in general.
I have little openGL programming knowledge(hence the use of the wrapper) and I require the ccLines to be blended nicely and look like either lasers or electricity.
How can I go about doing this avoiding the use of openGL programming if possible, otherwise i'll need to learn it.
you sample the surrounding pixels for each pixel of the area and average it out. This is the most basic way i know but it is not very fast so you could blend in 2x2 squares instead of 1x1 or even 4x4 and move over every iteration because for a nice effect you would do maybe 3 times.