I have been researching for this and read different opinions but i wanted to ask you more specific questions.
In my application i want to take 3 or 4 frames from the camera stream to process them without making the user press a button multiple times (and as fast as posible), i do this already on the android version, because android provides a callback method that contains each frame of the camera feed.
I have seen some people using the iOS AVFoundation (classes AVCaptureDevice, AVCaptureInput) to perform this tasks, but as far as i know, this is supported from version 4.0 of iOS.
Is there another way to do this and support older iOS versions? like 3.X?
how fast can the different pictures be taken?
Are there still problems using this Framework to get Apps/updates accepted on the App Store?
Thanks a lot,
Alex.
You should use the new way (AVCaptureInput), as only a few percent of users still use iOS 3. iOS adoption is much faster than android adoption. Early last winter about 90% had already upgraded to 4. At this point even 4.0 is likely in the small minority as well.
One pre-ios-4 way to do it was by opening a UIImagePickerController and taking screenshots. Depending on the exact version targeted, there are sometimes ways to disable the camera overlays.
I see this question: iPhone: Get camera preview
Related
A-Frame's immersive-ar functionality will work on some Android devices I've tested with, but I haven't had success with iOS.
It is possible to use an A-Frame scene for markerless AR on iOS using a commercial external library. Example: this demo from Zapworks using their A-Frame SDK. https://zappar-xr.github.io/aframe-example-instant-tracking-3d-model/
The tracking seems to be no where near as good as A-Frame's hit test demo (https://github.com/stspanho/aframe-hit-test), but it does seem to work on virtually any device and browser I've tried, and it is good enough for the intended purpose.
I would be more than happy to fallback to lower quality AR mode in order to have AR at all in devices that don't support immersive-ar in browser. I have not been able to find an A-Frame compatible solution for using only free/open source components for doing this, only commercial products like Zapworks and 8th Wall.
Is there a free / open source plugin for A-Frame that allows a scene to be rendered with markerless AR across a very broad range of devices, similar to Zapworks?
I ended up rolling my own solution which wasn't complete, but good enough for the project. Strictly speaking, there's three problems to overcome with getting a markerless AR experience on mobile without relying on WebXR:
Webcam display
Orientation
Position
Webcam display is fairly trivial to implement in HTML5 without any libraries.
Orientation is already handled nicely by A-FRAME's "magic window" functionality, including on iOS.
Position was tricky and I wasn't able to solve it. I attempted to use the FULLTILT library's accelerometer functions, and even using the readings with gravity filtered out I wasn't able to get a high enough level of accuracy. (It happened that this particular project did not need it)
I have problems in myself when I drive cars 🚘 I forget to slowly in some way have cameras 🎥 speed in high ways so I thinked if possible to make IOS APP to fixing these problems I explain my thing in image but I can't convert to coding by this step ?
1-After to speed camera 🎥 100 Miter Alerts me app( (there are camera speeds pleas slow down your speed.))
2- just post code i have basic programming languages in swift.
I'm not sure if I got you wright, so please correct me if I'm wrong.
You want an iOS app that tells you if there is a speed camera on the road you're driving, right?
So you have some possibilities to achieve that:
you can have a look at the app store. There are lot of such apps (e.g. TomTom) (easiest way)
if you want to build your own app you can make a use of the navigation sdk provided by mapbox: https://www.mapbox.com/help/ios-navigation-sdk/ (some programming skills needed)
Build your own app from scratch (much work and advanced programming skills)
If you want to build your app by mapbox or on your own you'll need the GPS-locations of speed cameras like provided here: https://www.scdb.info/
I have to build an app to recognize person on photo and find if this person is stored in phone book. I made face detection, I know how to take photos from people stored in phone book but I stuck on recognizing if the person is the same..
I want to ask what would be the easiest way to do it - i saw that iOS 10 comes with facial recognition in Photos app - is there any API to use facial recognition in iOS 10?
or should I use Open CV?
Face detection can be performed natively, as you've already found out, but to identify the faces you'll have to use something like OpenCV as there's no API available to do this presently
There's some information about how OpenCV can be used to recognise faces here.
Information about how to use it with Xcode here.
I built something similar some years ago.
I would suggest you look into perceptual hashing as it's an easy and inexpensive way of matching images.
You can have a look at the documentation, but this way your app will work only on iOS 10 and future versions.
If you plan to support older iOS versions or make also an Android app go for OpenCV
Hi i am developing an application using adobe air for iOS using flex.
i have the user take a snapshot and my intention is to upload the photo to my api.
the problem is when compressing the byteArray and then encoding it to a base64 String to send it up the apps freezes for 1-2 minutes.
My question is: is there a way to multithread this process in adove air, so i have it going in the background ?
and from your experience does an adobe native extension use another thread on the device for itself or no, maybe i can handle the background encoding and upload in a native extension.
Thank you all.
AS3, up until recently, was entirely single threaded. As of FP11.4 and AIR 3.4, you have access to Workers, which is essentially offloading tasks to a second thread. Beta support was added to Android in 3.8 or 3.9 and I believe it is out of beta now in 13.0. Workers are not supported by iOS, though. This is, I believe, because they have to cross compile to Objective-C to support iOS at all, so their methods won't work.
You're only option is to load the processing onto an ANE, which may or may not be a good idea. ANEs are meant to behave as a bridge between AIR and native OS APIs. While this would work, I think it goes beyond the scope of what an ANE is intended for.
Unless your photos are insanely large, I would suggest just not doing compression. Resizing photos (using the BitmapData class) is fairly quick on 4S+, so I don't think that is much of an issue (4S is closing in on being 3 years old at this point. Having old hardware means things run less than ideally, so anything older will just have to accept poorer performance)
Worker Documentation
I am developing an application that presents different stories for kids.
These stories are already made in flash.
My problem is how to add to the storys That app.
Initially one of the approaches was to create an app in Coco2D and make the animations in this language (converting the animations in pictures). However due to possess many animations and sounds, this process is very complicated
Thus, I asked opinions on what approach should I do to solve this problem.
Any opinion will help.
Thanks...
If you want to change the way you will solve the problem, you can try Adore Air which let you use Flash on iOS Apps : An example on how to do this
If you want to continue with Cocos2D, you can find good tutorials there for your project :
Good Tutorials to make a project with Cocos2D
If your stories doesn't have any interactive elements, you can try to convert your stories in Flash to Video Files with some softwares (try to enter it in Google).