I continue playing with powerful NEON engine in iPhone and iPad devices. Recently i bought iPhone 4S that replaced my HTC Mozart and i decided to check how to speed up BGRA to GRAY color conversion procedure using multithreading.
After a long delay i’m happy to resume posting OpenCV tutorials in my blog. In Part 7 i will present you a new way of generation of icons for samples. Also i’ll show how to use NEON and assembly language to speed-up cv::transform function twice! Also there are three new samples i have to say few words about each.
Interface improvements Default sample icons I think each sample has to have it’s own unique icon image.
Hi friends! the summer has ended and schools and universities has opened their doors in front of new students. Since i graduated few years ago i still remember good old times of study. Doh. I’m to so old yet :) So, on 1st September i decided to share with you about my plans for next three months. Because i scheduled very interesting activities for this autumn.
OpenCV Hotshots Yes it is.
I’m glad to publish a official announce of the OpenCV Hotshot book. This book is currently available as a RAW (Read As we Write) book. A RAW book is an ebook, and this one is priced at 20% of the usual eBook price. Once you purchase the RAW book, you can immediately download the content of the book so far, and when new chapters become available, you will be notified, and can download the new version of the book.
I think developers and research guys who works with object recognition, image registration and other areas that uses keypoint extraction can find this post useful. Recently (from 2.4.2) a new feature descriptor algorithm was added to OpenCV library. FREAK descriptor is claimed to be superior to ORB and SURF descriptors, yet it’s very fast (comparable to ORB). Also people in comments on my blog mentioned BRISK descriptor which is also new and more efficient than SURF.
[toc] Hi folks! I’m glad to publish a sixth part of the OpenCV Tutorial cycle. In this post I will describe how to implement interesting non-photorealistic effect that makes image looks like a cartoon. It has numerous names: cartoon filter or simply “toon” also it known as rotoscoping. In addition we will refactor application interface and add tweeting feature to share your results across the web. According to the roadmap I promised to put the video recording module too, but due to lack of free time I decided to put it on hold for now. To compensate this in this part I will demonstrate how to get Sepia effect using simple matrix multiplication. Don’t afraid, video recording will be added, but later. I think after part 9, when most of the samples will be optimized using ARM NEON I will add this feature.
