OpenCV computer vision with iOS

16/1/2013
Repo had become a mess. Trashed it with a fresh commit.

9/1/2013
added fast vs accurate comparisons
fast omits canny and only scans 1 colour plane
accurate includes canny and scans all colours

2/1/2013
openCV library compiled from latest gitHub clone

Requirements: OSX10.7+ XCode4.4+ iOS5.0+
For XCode4.2/Snow Leopard see OpenCVSquaresSL

integrating openCV and C++ with objective-C

This is a sample application using openCV in iOS. It adapts the "squares.cpp" sample code included with the openCV distribution. https://github.com/Itseez/opencv/blob/master/samples/cpp/squares.cpp

Prompted from a question on stack overflow:

http://stackoverflow.com/questions/13958321/iosretrieve-rectangle-shaped-image-from-the-background-image?lq=1

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The aim is to keep the original c++ code as pristine as possible, and to keep the bulk of the work with openCV in pure c++ files for (im)portability.

CVViewController.h / CVViewController.m

• pure Objective-C

• communicates with openCV c++ code via a WRAPPER... it neither knows nor cares that c++ is processing these method calls behind the wrapper.

CVWrapper.h / CVWrapper.mm

• objective-C++

does as little as possible, really only two things...

• calls to UIImage objC++ categories to convert to and from UIImage <> cv::Mat
• mediates between CVViewController's obj-C methods and CVSquares c++ (class) function calls

CVSquares.h / CVSquares.cpp

• pure C++
• CVSquares.cpp declares public functions inside a class definition (in this case, one static function).
  This replaces the work of main{} in the original file.
• We try to keep CVSquares.cpp as close as possible to the C++ original for portability.

UIImage+OpenCV

This UIImage category is an objC++ file containing the code to convert between UIImage and cv::Mat image formats.