How to change Install Dir when Building OpenCV 3.1.0 on Ubuntu 18.04 for...
I am trying for over one week to compile OpenCV 3.1.0 for Android with NDK r18 on Ubuntu 18.04. I have used the following command: cmake -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON \...
View ArticleHow to extract those keypoint to text file
Greetings...i needed some help regarding SIFT on android..i been executed SIFT algorithm in android and result (link) as below..and how do i extract those values of the keypoints to a text file??This...
View ArticleUnknown error code -220 on cv::ocl::attachContext
Hi guy, I am new to OpenCV and I am trying to make an Android app with OpenGL OpenCL and OpenCV. I looked around the internet and I have found many examples but none of them works with my devices....
View ArticleWhy after fusion my picture is dark
Hello, I use OpenCV 3.4.3 in Java for android I use this script : https://docs.opencv.org/master/d3/db7/tutorial_hdr_imaging.html to make hdr picture. However My result is to dark and I want to...
View ArticleHow to Crop image after extract text in JAVA
I'm trying to use android-opencv to recognize text in the picture and I want to do something like finding blocks of text in an image and crop them. After croping image I will get some of text image...
View ArticleCreating Android app using java and openCv Query
Hi guys, i am currently planning a project and could use some assistance regarding my setup. My app goal is to detect when a person is falling asleep based on facial detection, eyes closing and other...
View ArticleOpencv error: undefined reference to 'cv::CascadeClassifier::detectMultiScale
Hi, I am newbie to OpenCV. I am using latest version for android openCVLibrary343. getting error while running project.. [OpenCv Face...
View Articlednn::net forward in native C++ Android Studio
Hallo, I want entwickelt native c++ App in Android studio but I come cross undefined reference to 'cv::dnn.Net::forward(out, layerNames)". I need help how can I use net.forward(out, layerNames) in...
View ArticleOpenCV Manager removed from play store
As I noticed OpenCV Manager was removed from play store and without it, apps that uses OpenCV can't be launched. Is there any way to run app without manager? I know that manager can be installed...
View ArticleImage comparing using "ORB" opencv for android
hi everyone, I am new to OpenCV and I am trying to write an android code using OpenCV to compare two images for similarities, for my example i loaded two images from Drawable folder as you see in the...
View ArticleOpenCV Contrib Android - Module appears in Java, but not in C ++
Hello guys, I have an Android project, and I'm using an OpenCV compilation with the extra modules, from opencv_contrib. The compilation I am using is available here:...
View ArticleUsing calibrateCamera without Chessboard
Hi all, I am not familiar with Calib3d.calibrateCamera(): https://docs.opencv.org/3.2.0/d9/d0c/group__calib3d.html Is it possible to calibrate the camera without the use of a checkered chessboard...
View ArticleIs there implicit limit for DNN input size of OpenCV Android?
I trained a Caffe model which does NOT specify input sizes. Then I ran it on Android using OpenCV. The code is like below. private void runEntireImageTest(Mat inY) { float scaleFactor = 1.0f / 255.0f;...
View ArticleLow accuracy of SVM on Android
Hello guys, I have an Android project that uses the face detection feature (Cascade Classifier). After recognizing the face, I trim the eyes and use a descriptor (Kaze) in conjunction with Bag of Words...
View ArticleHow can I improve the binarization of image in my sample app
I'a practicing in proprocessingiages in android studio and I want to improve the binarihiszation of images in my program, for example i have this image: ![image...
View ArticleHow to get pixel values of a binarized image in android studio?
I want to get the pixel value of a binarized image and store it in an integer array. I used openCV to grayscale the image and used adaptivethreshold for the binary: grayBitmap =...
View ArticleHow to get pixel value of a binary image.
How to get the values of a binarized image? I have this line of code that turns my grayscale image to binary:...
View ArticleWhere to find header files when building with android-gradle
I have successfully built OpenCV 3.4.3 from source using Gradle and the Android NDK (16b - 18b also seemed to work). I've used the ExternalNativeBuild plugin to do this - which seems to be the current...
View ArticleHow to get pixel values of a binarized image in android studio?
I want to get the pixel value of a binarized image and store it in an integer array. I used openCV to grayscale the image and used adaptivethreshold for the binary: grayBitmap =...
View Articleerror: (-215) 0
I have suceesfully drew a rectanlge over the face in Android. Inorder to crop the selected face I used the following code: Mat cropped_face = image; Rect cropped= new Rect(facesArray[i].tl(),...
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