OpenCV computer vision with iOS: stitching panoramas
Version 5.0 of OpenCVStitch - updated for Swift 5.0 + OpenCV 4.3
See appropriate branches and tags for Swift 2.x - 4.x
This project was created to a answer a couple of Stack Overflow questions:
libraries to CAPTURE panorama in iOS
Can I mix Swift with C++? Like the Objective - C .mm files
v2 demonstrates how to mix Swift, Objective-C and C++ in one project whilst keeping the code clearly separate.
The project AppDelegate and View Controller are written in Swift. Swift cannot talk directly to C++ (which we need for OpenCV), so we provide an Objective-C++ wrapper class to mediate between Swift and C++. We also provide an Objective-C++ category on UIImage to mediate between UIImage and CV::Mat image formats. The CVWrapper header file is pure Objective-C. For v1(which doesn't use Swift) this separation was a matter of clean style. For v2, it is a requirement: if any C++ headers are included in the wrapper, the app will not compile (Swift won't like it).
Installation
To run the project you need to install the OpenCV framework using Cocoapods
Assuming you have first installed CocoaPods, run 'pod install' in this directory to install OpenCV for the project. From then on, always open the project in XCode from the SwiftStitch.xcworkspace file that the pod install creates.
The podfile will install openCV v4.3.0.
Use
OpenCVStitch is a very simple iOS/openCV example showing basic use of the Stitcher class. The c++ code is adapted from a sample included with the openCV distribution.
The app has almost no user interface. On launch, the stitching code operates on four sample images, displaying the result in a UIScrollView.
OpenCVSwiftStitch Versions
Version 5.1
Swift / Objective-C / C++
OpenCV 4.3
Modern Swift - async / await
Error, exception handling from C++ -> Objective-C -> Swift
Tested with XCode 13.2 / Swift 5.0 for iOS 13.0+
Version 5.0
Swift / Objective-C / C++
OpenCV 4.3
Tested with XCode 12.0 / Swift 5.0 for iOS 9.0+
Version 4.0
Swift / Objective-C / C++
Tested with XCode 10.0 / Swift 4.2 for iOS 8.0+
Version 3.0
Swift / Objective-C / C++
Tested with XCode 8.0 / Swift 3.0 for iOS 8.0+
Version 2.1
Swift / Objective-C / C++
Tested with XCode 7.0 / Swift 2.0 for iOS 7.0+
Version 2.0
Swift / Objective-C / C++
Tested with XCode 6.4 / Swift 1.2 for iOS 7.0+
Version 1.0
Objective-C / C++
Tested with XCode 4.5.2 -> 6.3 for iOS 5.1 upwards
Provides a partial answer to: Libraries to capture panoramas in iOS 6 (Stack Overflow)
OpenCV Versions
OpenCV 4.3
The podfile installs OpenCV 4.3
this version of OpenCVStitch opted to use cocoapods to overcome the notorious installation issues with previous versions of the framework
XCode 12
Project is now updated for Swift 5.0 and XCode 12. For backwards compatibility checkout the 2.0 / 2.1 branches, 3.0 /4.0 releases or refer to the Objective-C version v1.0.
Comparisons
| OpenCV 2.4.9 | OpenCV 3.0.0 | OpenCV 3.1.0 | OpenCV 4.3.0 |
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