Google play alert about libpng security warning with openCV 2.4.11
Im using openCV to write c++ and java for my Android application. there is new security alert from Google play "libpng containing a security vulnerability". libpng contains a security vulnerability...
View ArticleCreate libopencv_java.so from source
Hi I've downloaded openCV source code and follow http://code.opencv.org/projects/opencv/wiki/Building_OpenCV4Android_from_trunk (OpenCV build section) to build for Android. after running make -j8 I see...
View ArticleROI in android
I want to make a app that enable use to select ROI and save it to gallery like this . This is the...
View ArticleOpenCV4Android 3.1 Mat to Allocation Renderscript
I am making an Android app to simulate colourblindness. It takes a camera feed and manipulates at runtime. - My question: I have an OpenCV Mat object rgba, containing all Pixels of a given frame with...
View ArticleOpenCV manager 2.4
I'm making a project using OpenCV on android android studio. I am using OpenCV library 3.0 because I made a project to calculate the image moments, but the library as Imgproc.Moments not exist in the...
View Articleopen api reference for android
where can I find open api reference for android? could you tell me?
View ArticleDrawMatching between two images - image recognition
I was trying to show the matched keypoints between two Images (one that is captured from my camera and the other from the database) Can anyone help me out in writing DrawMatches function in my code in...
View ArticleOpenCV multi-threading frames on Android
I am doing some work with OpenCV on Android. My code was all on the Java interface and its performance was very bad, so I implemented almost all the image processing with JNI. So on Java I have:...
View Article3.1 build for "armeabi-v7a with NEON" fails
On my OSX machine I added -DANDROID_ABI="armeabi-v7a with NEON" to the cmake command in platforms/scripts/cmake_android_arm.sh When I now execute make -j5 in build_android_arm directory I get...
View Articlehow to get camera frame whitout showing it on activity windows
Hi, So a got a problem with the use of "implements CvCameraViewListener2". If anderstoud that we need to setContentView of the activity if not we cannot get the frame on onCameraFrame. My probleme is...
View ArticleCan't make CameraGLSurfaceView works on Android
Hi, I'm trying to run the example from this link: https://github.com/opencv/opencv/tree/master/samples/android/tutorial-4-opencl The project compiles fine, but when i run the application on my Sony...
View Articlendk-build tutorial-4-opencl
Hello everyone, I was searching around for ways to use camera2 with OpenCV, and came across [this tutorial](https://github.com/opencv/opencv/tree/master/samples/android/tutorial-4-opencl). However,...
View ArticleWhere to find example for OpenCV on Android
Hi, OpenCV on android is quite different from the C++ version. Data in method are not the same. The vector as change to Mat. So it is quite difficult to use it without any documentation on the use of...
View ArticleTrouble setting up OpenCV with NDK in Android Studio
Hi, I would like to use OpenCV with the NDK in my Android Project. I am using Android Studio. I can't get it to compile properly. I am getting error while including opencv2 in my cpp file..... ** I...
View Articleshow the intermediate MAT in Android
Hi, On android we need to do this : Mat rgba = inputFrame.rgba(); // get the full picture Mat rgbaInnerWindow = rgba.submat(0, height, 0, width); // Procces it Imgproc.cvtColor(rgbaInnerWindow,...
View ArticleHow to tranform image in negative like the camera effect-negative
Hi, I want to transform the rgba image and apply a nagative-effect. Can i do this with OpenCV ? If yes. How ? Thanks
View ArticleHardware requirements to run Opencv in a Android platform
Hello, I'm developing some apps using Haar Cascade for Android and I want to know which is the cheaper smartphone that can execute them. Does anybody know what are the minimum hardware requirements to...
View ArticleAndroid Camera2Renderer can't find the correct resolution
Hi, I'm trying to run this opencv4android example (android tutorial 4): https://github.com/opencv/opencv/tree/master/samples/android/tutorial-4-opencl The project compiles fine, but when i tryied to...
View ArticleConvert org.opencv.core.Point[] pointsTmp to MatOfPoint2f
Hi, I need to convert an org.opencv.core.Point[] array to a MatOfPoint2f array, And i can not find a way to do it. This is my org.opencv.core.Point[] array named pointsTmp org.opencv.core.Point[]...
View ArticleOpenCV4Android Lower Screen Resolution While Maintaining Fullscreen
I am making an OpenCV app on android that needs a lowered resolution of 640x480 to compensate for the heavy image processing I am doing. I do this in the main activity like so:...
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