hardboy111's profile - activity

Does someone have a ios6 project template sample that uses features2D without linker errors..at this point im willing to make a donation if someone could share it with me :)

..i also found someone with a similar issue here http://stackoverflow.com/questions/13933513/build-error-using-featured2d-in-opencv-with-xcode but the solution didnt help

I also invesigated the /features2d/include/opencv2/features2d/features2d.hpp file and found it has a depedency on the module "opencv2/flann/flann.hpp". But when I try and include this in my code it does not exist. Does this mean anything ?

is this true http://iqwen.net/question/32738 that brisk isnt actually included in the standard opencv build? Could this be a reason why it does not recognise the symbols?

Hi, cv::Mat::eye(3,3, CV_8UC1) did not cause any linker errors - compiled ok.

any one? i havent a clue what the problem is - normally linker errors result from a framework not included but it definitely is! :(

Hi,

So I managed to successfully compile the latest opencv source and generate the opencv2.framework. I also successfully implemented this tutorial (http://docs.opencv.org/trunk/doc/tutorials/ios/video_processing/video_processing.html).

I then started to modify my code to add in some feature detection code. I included the module #import <opencv2 features2d="" features2d.hpp=""> and started to code including some key classes and methods needed. The intellisense recognised these classes as I started to type e.g.

Algorithm::create<FeatureDetector>
BRISK BRISKD();
BRISKD.create("Feature2D.BRISK");
BRISKD.detect();
BRISKD.compute()

But then when I tried to build I got linker errors for these classes and method calls. Im confused as I know I have the latest version of opencv framework as the video tutorial all worked fine. The specific errors are shown below. Can anyone suggest why I have problems using the Feature2D module on iOS?

    Ld /Users/mh/Library/Developer/Xcode/DerivedData/Cukamo-fzqnynxgvslzftbswmivdfpiuqdy/Build/Products/Debug-iphoneos/Cukamo.app/Cukamo normal armv7
    cd "/Users/mh/Documents/iOS Projects/Business/Cukamo"
    setenv IPHONEOS_DEPLOYMENT_TARGET 6.0
    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk -L/Users/mh/Library/Developer/Xcode/DerivedData/Cukamo-fzqnynxgvslzftbswmivdfpiuqdy/Build/Products/Debug-iphoneos "-L/Users/mh/Documents/iOS Projects/Business/Cukamo/Cukamo/tesseract-ios-lib/lib" "-L/Users/mh/Documents/iOS Projects/Business/Cukamo/Cukamo" -F/Users/mh/Library/Developer/Xcode/DerivedData/Cukamo-fzqnynxgvslzftbswmivdfpiuqdy/Build/Products/Debug-iphoneos "-F/Users/mh/Documents/iOS Projects/Business/Cukamo" "-F/Users/mh/Documents/iOS Projects/Business/Cukamo/../../../../opencv/ios" -filelist /Users/,h/Library/Developer/Xcode/DerivedData/Cukamo-fzqnynxgvslzftbswmivdfpiuqdy/Build/Intermediates/Cukamo.build/Debug-iphoneos/Cukamo.build/Objects-normal/armv7/Cukamo.LinkFileList -dead_strip -fobjc-arc -fobjc-link-runtime -miphoneos-version-min=6.0 -framework opencv2 -lc++ -framework CoreMedia -framework CoreVideo -framework CoreGraphics -framework QuartzCore -framework CoreImage -framework AVFoundation -framework AssetsLibrary -framework Accelerate -framework UIKit -framework Foundation -llept -ltesseract_all -o /Users/mh/Library/Developer/Xcode/DerivedData/Cukamo-fzqnynxgvslzftbswmivdfpiuqdy/Build/Products/Debug-iphoneos/Cukamo.app/Cukamo

Undefined symbols for architecture armv7:
  "cv::DescriptorExtractor::compute(cv::Mat const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::Mat&) const", referenced from:
      -[ViewController processImage:] in ViewController.o
  "cv::Algorithm::_create(std::string const&)", referenced from:
      cv::Ptr<cv::FeatureDetector> cv::Algorithm::create<cv::FeatureDetector>(std::string const&) in ViewController.o
      cv::Ptr<cv::DescriptorExtractor> cv::Algorithm::create<cv::DescriptorExtractor>(std::string const&) in ViewController.o
  "cv::Feature2D::create(std::string const&)", referenced from:
      -[ViewController processImage:] in ViewController.o
  "cv::FeatureDetector::detect(cv::Mat const&, std::vector<cv::KeyPoint, std::allocator<cv::KeyPoint> >&, cv::Mat const&) const", referenced from:
      -[ViewController processImage:] in ViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Title says it all really..any help much appreciated.

I included the appropriate library 'opencv2/features2d/features2d.hpp' but when I compile SURF isnt recognised.

Im trying to do this http://achuwilson.wordpress.com/2011/08/05/object-detection-using-surf-in-opencv-part-1/

If anyone has other examples please forward on

thx

Hi,

I'm just starting out learning openCV and just looking for some guidance on a problem im playing with.

Essentially what I want to be able to do is detect a sentence of text from a video stream(localization). I've learnt how to capture the mat frames and now im onto the bit of actually doing the detection where im a bit lost.

The key thing is that the sentence of text always starts with the same symbol (the text will vary). What I want to do is detect and bound the text, cut it from the image frame and do some post processing on the text.

I know there are various alogrithms available but I dont know which i should be focusing on e.g. classifers, features etc?

If some one could guide me with some practical advice on even how to detect the symbol that would be most appreciated. I'm developing on iOS but I guess it doesnt have to be iOS specific.

Thanks

Mike