Tõnu Samuel's profile - activity

Downvoted. Not an answer.

You do not pass Matrix as argument, do you understand this?

What you are trying to achieve with cv::countNonZero(masked == 255)? http://docs.opencv.org/modules/core/doc/operations_on_arrays.html says argument must be array, not some logical comparison.

I never worked on hand recognition myself but whatever OpenCV question I see, usually answer is in "Learning OpenCV" book. I strongly recommending it, saves time. In this book hand recognition topic is discussed with contours.

https://www.google.com/search?q=contour+hand+opencv provides multpiple posts about it.

You asked same question in different places and got similar answers. Value time other people spend on you and at mark some answers as accepted. People do not get even points from you otherwise. Same applies to other questions you asked in this site.

Get a book "Learning OpenCV". Explains many things including camera calibration already suggested. The rest is very basic school triangles math.

IOS is known to be slow compared to PC in many different reasons. In my case first time I used algorithms on IOS they ran 200 times slower than on PC. I did some work and learned some tricks how to speed up IOS: http://stackoverflow.com/questions/11219240/maximum-speed-from-ios-ipad-iphone And of course you always can try to work with smaller image. Handheld, battery powered ARM is not PC-like monster.

All caps title without much information what you actually ask. Tags misformatted. Missing punctuations. All makes difficult to work with, so voted down.

I do:

mkdir build
cd build
cmake ../OpenCV-2.4.2 -DWITH_QT=YES
make -j4
sudo make install

Mac OSX, Ubuntu Linux all same way and works well.

You need to re-implement camera driver plus more software for your ARM7 unless you use some existing OS. I hope Linux runs on ARM7, so if you use linux you can reuse anything what already works under linux.

Sounds like your camera device /dev/video0 is inaccessible to non-root users. Try to run with sudo.