Building OpenCV4Android With OpenGL and OpenCL Support
> **TL;DR:**>>What is the "official" way to build OpenCV4Android, from source, with OpenGL and OpenCL support? I am using the Android NDK, and was using the pre-compiled OpenCV4Android...
View ArticleDrawing Contours around License Plate for android app
-1 down vote favorite I want to find contours and set Region of Interest around License Plate. I am using opencv + android. Please help me how do I find contours set Region of Interest around License...
View ArticleAndroid + OpenCV - Zoom camera frame
Good Evening, now I have a problem with find some solution for zoom camera frames. I have a this ...  ... and I want zoom it like this. ![image...
View Articlemakeptr(inputpath) does not showing the input file path
I was trying to do stabilization of video using this link as reference github.com/opencv/opencv/blob/master/samples/cpp/videostab.cpp but the code breaks in the following line (line number 369) in...
View ArticleDetect and count number of people showing in front of android camera
I want to detect and count all peoples showing in front of camera i use OpenCV HogDescripter approach but it is quite slow.I use jni c++ cascade approach haarcascade_fullbody.xml but it detects single...
View ArticleHow to compare two identical faces in android using OpenCV
I'm trying to compare the similarity between two faces in two photos, but I do not know where to start, I have searched for related documentation, but all in C ++ language, who can help me? Look for...
View ArticleDual lens stereo cameras for Android Opencv?
I am playing with left and right views for stereo vision/Opencv on Android platform. Seems the LG Optimus and HTC EVO are the only devices that I can find with left right stereo lenses...since...
View ArticleReduce Apk size
Hi, i am new in this field so please tell me how i can reduce apk size when i using opencv 3.2 in my android app. All i need from this library is create circular camera use CameraBridgeViewBase class...
View Articlecreate convexhull around detected keypoints
I read an image in android and detect the keypoints using sift algorithm, then I want to create Object of Interest (OOI) around these keypoints by creating a convex hull of the corresponding points...
View Articleobstacle detection size expansion algorithm
I try to follow this paper (Monocular Vision-Based Obstacle Detection/Avoidance for Unmanned Aerial Vehicles) to do obstacle detection, I worked with SIFT algorithm in order to detect the keypoints in...
View ArticleCMT (CppMT) is very slow in android
I wrote an application using CMT. I wrote JNI wrapper to wrap the two APIs in CMP, initialize and processFrame (the gnebehay/CppMT). void JNICALL Java_com_cmt_demo_MyActivity_initialize(JNIEnv *env,...
View ArticleRealtime Video Frame from Camera passing from Java to native
As in most of the Android cases, native VideoCapture class does not work, I am trying to send live video frame from Java to native cpp code through JNI. I followed the sample example (mixed signal)...
View ArticleSudoku Solver Using OpenCV in Android
I am currently making an app that lets you solve a Sudoku in real time. The Sudoku image is feeded directly though the camera. I am at the stage of edge detection, but i am stuck at grid detection (I...
View Articleunable crop a mat
## Getting originalMat into 50*50 Bitmap## Mat cropped = originalMat.submat(0, 50, 0, 50); Bitmap tempBitmap = Bitmap.createBitmap(50, 50, thumbnail.getConfig()) Utils.matToBitmap(cropped, tempBitmap...
View ArticleAndroid_app_not_working_on_x86_64_systems
A friend asked me to check whether it is possible to make an app work on a x86_64 Android system. The app was written a couple of years ago implementing openCv 2.4.5 libraries and works fine on x86...
View ArticleOpenCv 3.20 for Android. Videowriter and 3rd party libs (ffmpeg)
OpenCv3.20 for Android only allows (for what I have tried and seen in some posts) videowriter to encode .AVI files with fourcc "MJPG" code. Any other options that I have tried result in .isOpened()...
View Articlewhy black resulted image while cropping largest contour from image ?
[C:\fakepath\Screenshot_2017-05-14-19-55-56[1].png] (/upfiles/14947853878510603.png)@Override public Mat onCameraFrame(Mat inputFrame) { source =inputFrame; contours = new ArrayList(); hierarchy = new...
View ArticleOpencv4android: Runtime Error org.opencv.features2d.DescriptorMatcher.match
I run my application, It's build successes. But when i run on my android device, It's crash. This error from LogCat (see below). I work with Opencv4Android 3.1.0 message from LogCat: AndroidRuntime:...
View ArticleDetect laser light dot of any colour using OpenCV in Android
I am trying to detect laser light dot of any colour of laser. i have tried some code and it is running perfectly for Only RED colour detection and i want any colour of laser dot detection. I am new in...
View ArticleOpenCv Shared Files (.so) for arm64-v8a
Hello world, I'm having an issue with my android app. I have an error asking for file “libjniopencv_core.so”. so I wanted to add it in the folder JNILibs/arm64-v8a after downloading version 3.1.0...
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