In this post I’m sharing the pre-built libraries and binaries for OpenCV that I use to build Qt/QML and OpenCV powered apps for Android (armeabi-v7a) phones. An example of such application is Quick-Camera-CV which I shared its source codes in a previous post. Continue reading “OpenCV 3.2.0 Pre-Built Libraries for Android”
I have avoided using QML for long time and always wrote even the most simple applications using Qt Widgets and C++ code but the release of Qt’s Quick Controls 2 and Material Style just made it very irresistible and I had to go for it. Well it didn’t take too long to get a hold of things (for a newcomer) since I had enough programming experience and QML is just too well-structured and easy to learn and use. In this post I’m going to share a project that demonstrates using OpenCV in QML to write beautiful and powerful Android (and other platforms) apps.
This one is taken from one of my favourite books (OpenGL 4.0 Shading Language Cookbook) and the relevant chapter’s title for this tutorial in the book is called “Implementing diffuse, per-vertex shading with a single point light source”. Of course it’s modified to use OpenGL ES in Qt which is more cross-platform and creates less issues with building and running on different operating systems (including Android and iOS)
Sır aşikar olmaz meğer
Aşkın şarabından eğer
İçsen görürsün gördüğüm
Görmek bu aşuba değer
First of all let’s briefly go through what’s an OBJ File. Here’s a very brief description from Wikipedia: “OBJ (or .OBJ) is a geometry definition file format first developed by Wavefront Technologies for its Advanced Visualizer animation package. The file format is open and has been adopted by other 3D graphics application vendors.” Anyway, I’ll assume that now that since you’re here you already know what an OBJ File is and How and Where to use it.
If you’re a regular Qt user (like me) and have tried writing Android applications with Qt then you must have come across situations where you’ve needed some very simple capabilities of Android API but it wasn’t present in the Qt library. Displaying a Toast message in Qt for Android is one of those situations. In this post I’m going to describe how to display Toast messages in Qt for Android, and it’s also a very good example of showing how to use JNI (QAndroidJniObject class in Qt, along with Java code) to access Java code from within C++/Qt code.
Bu iki beyti yine yazmalıyımdır meleğim
Nefesi sözlere aktarmalıyımdır meleğim
Bu işin kürdü de yok, türkü de yok
Arap, acem, hepsi yalandır meleğim
Bu yalanlarla bizi hep ayırırlar
Seni benden, beni senden meleğim
Bizi düşman kılıp asude olurlar
Ama her şey, sonu vardır meleğim
Bu dövüşler, bu savaşlar, bu ölümler
Bir sabah uyandığında bitecektir meleğim
Geriye toz bile kalmaz göreceksin
İzleyen sen olacaksın meleğim
Ne olursak olalım, bu can emanet
Vereni bizleri hep izleyecektir meleğim
You can use Cascade Trainer GUI to easily train and test your cascade classifiers. It has a very simple user interface which helps with everything related to training cascade classifier that are usable with OpenCV. Starting from preparing the positive and negative image data set, its cropper tool will help you with quickly preparing your training data set. Just make sure you have enough videos of the object you want to train a classifier for, and detect. It also allows avoiding all the complexities of setting parameters for the training. Of course if you want a very high quality classifier, then you’d have to touch a few parameters here and there but for the most part, it’s select and Go.
You can use the Train tab to train a classifier, and then use the Test tab to test it on a video or image. And switch between them as long as you’re not satisfied with your classifier’s performance.
You can always download the latest version of Cascade Trainer GUI from its official website, or by clicking here.
And make sure to report any bugs and missing features using the Contact Me page.
Today I released a new version of Picture Stamper after quite a while. This version addresses a few minor issues in the user interface and also as of this version (v2.8.0) you can also set an opacity level for Logo and/or Watermark text that you add to the images. Pretty much everything else is the same, but you can find out for yourself if you head to official Picture Stamper page.
Below is an screenshot of the Mac OS X version (exactly the same as Windows version) in which I tested the new features on my own picture 🙂