libopencv_java3.so for x86 is 3x larger?
I've noticed that libopencv_java3.so for Android is around 40mb for x86 but just 10mb for armeabi. Does anyone know why the x86 flavour is so big?
View ArticleHow to match object in image with SURF on Android
Hello guys, I am trying to build an application that has a capability to matching an image using SURF, I've succeed to obtain the keypoints and descriptors for each image. but when I try to match it...
View ArticleDetermine the different corners of a rectangle detected on screen
I have an image with a significantly large rectangular area in it, as shown in the image below.  (On an Android phone) I can easily detect...
View ArticleSIFT Descriptor content
I got really confused by the content of SIFT descriptor. As I got the descriptor should contain the orientation of keypoints. For each keypoint 128 numbers different orientations. And then a feature...
View ArticleTemplate matching not working as expected
I am very new to opencv and using for template matching.Actually i want to match two images below are my code snippet int match_method=Imgproc.TM_CCOEFF_NORMED; Mat temp =...
View ArticleHow to increase maximum number of features in ORB detector in Android OpenCV
Hi, all, I tried to use ORB detector in Android to detect features of image, but I found the maximum number of features detected by ORB detector was 500. Is there any way to detect more feature?
View ArticleSFM for android
**System information (version)** - OpenCV => 3.4 - Platform => Android - Compiler => NDK 16b **Detailed description** We try to compile sfm for android, but we face some errors. Is it...
View ArticleProper T-API Tutorials
Is there a complete tutorial on the proper way of using the T-API functions in OpenCV to make code that works without a glitch? Rule of thumb such as function that syncs the GPU/CPU functions or...
View ArticlePtr_StereoMatcher in java wrappers for android
Hello! I builded opencv 3.4.0 with opencv_contribs for android and succesfully added opencv to project and run it. But in module ximgproc I don't see functions for disparity map filtering...
View ArticleHow to compare static images with camera image using openCV
I am working on object recognition in android using openCV. Below are my usecase . 1) I have static images in my drawable(I have captured these images using my mobile cam and stored in drawable) 2)Then...
View ArticleFatal signal 6 (SIGABRT) when openCV is linked
Hi everyone, I have a Qt project for Android and few linked libraries to the project (one of them is openCV for recognizing some objects). When some class throws an exception sometimes it can't be...
View ArticleHow to extract color patches from image?
Hello I am knew to OpenCV. I have just started developing with Android and OpenCV. I have an image as given below. I need to extract those ten square color patches from it. What method(s)/procedure...
View ArticleHow to use openCV BOW API in android
I am using SURF FeatureDetector to compare static images with camera image[FeatureDetector ](http://answers.opencv.org/question/182384/how-to-compare-static-images-with-camera-image-using-opencv/)....
View Articletraits.hpp compile error opencv 3.4
Hi all, I'm trying to compile .so libraries for Android NDK. The cmake configs are for ndk version 9 and and using all the opencv-contrib modules. When I go to the directory after `cmake` has done...
View Articleandroid camera
Hi i would like to use open cv in one of my application for android but i need the camera to be run along with that app in background, i am not able to run the camera in background ,can anyone help me...
View ArticleWhy MatOfPoint is list of points?
Hi, I'm quite new in OpenCV and image processing, I'm trying to understand findContours function and handle it's result, particularly I have to detect from image discrete graph and the number written...
View ArticleHow to find the duplicate images?
I have collection of images in my gallery, Whenever i have taken the image using my mobile camera before saving the image in Gallery, I want to check the image has already exist or not in gallery. I...
View Articleworkaround to link against libopencv_java3.so using cmake, ndk r16b ,clang...
Hello I'm trying to build a shared library (.so) for android , basically is a simple region detection module. But if I link my library with stl = c++_shared I have the next error: error: undefined...
View ArticleConvert Mat to normalized float array
Hello, I am trying to use opencv on android to detect objects and then to pass these objects to trained tensorflow model. The problem is that my tensorflow model needs float array of the image on the...
View ArticleAre there any clear and working installation guide to use OpenCV c++ in...
I have tried a some of installation guides but each one had a problem and didn't work finally! I am really seeking a more complete with more explanation of how to use OpenCV C++ on Android...
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