cannot load image on android
Every time I try to run template match function in android studio, I get Assertion failed error. I have started to debug and my img.cols() and img.rows() is always 0. Some kind of empty matrix is...
View Articlehow to find all the objects in the picture with one template using opencv and...
i tried to do a code that find all objects using a template .The logCat don't give me any errors but the application stopped this is the code .Please help me public Mat matchTemplate(String inFile,...
View ArticleSegfault when using add on Android
What I'm essentially trying to do is: L = (17.8824 * r) + (43.5161 * g) + (4.11935 * b) The code I'm using for that is essentially: Mat rgb = inputFrame.rgba(); List rgbSplit = new ArrayList(3);...
View ArticleHough transform in OpenCV4Android
Hi guys, I'm stuck again on my app, i.e. detecting boxes on shelf. now I am starting to use simpler photos, with foreground (boxes) is different from background: colored boxes on white or black...
View Articlein android, to show an image using opencv, where should i create the Mat object?
I dont know in what place i need to do it, I know that not in onCreate, but i dont know where yes.
View ArticleWhy the trained model's performance is not the same while running on PC and...
Hi, I have trained a cascade classifier for a particular object. The classifier is supposed to be used in android app. For testing purposes I've written a python script and the model performance...
View Articlehow to use Opencv machine learning for android project (KNN or SVM algorithms)?
I need your help .I am a beginner in opencv and i should recognize letters in an image taken by android camera .I should use opencv machine learning such us KNN or SVM .I searched a lot but i don't...
View Articleprocess of ORB algorithm in OpenCV
Dear great OpenCV community I am a computer science bachelor student. Presently, I am using OpenCV 3.0.0 and Android Studio to make an markerless augmented reality android app for my thesis. For the...
View ArticleAndroid - Opencv - error: (-215) u != 0 in function void cv::Mat::create
My app keeps crashing with this error FATAL EXCEPTION: Thread-22883 Process: com.aar.Cline, PID: 7270 CvException [org.opencv.core.CvException: cv::Exception:...
View ArticleOpenCV4Android - calcCovarMatrix for image averages
So I have two RBG averages that I want to get a Mahalanobis distance for but the Mahalanobis function requires an inverse co-variance matrix. My question is how do I create a inverse co-variance matric...
View ArticleSimpleBlobDetector in opencv for android
Helle everyone! I'm quite new to opencv , so I'm having a hard time tring to use the class SimpleBlobDetector in my Android project (OpenCV library 300) . I don't know how to create the detector. All...
View ArticleError when tring to train image with opencv and android
public class MainActivity extends Activity { Button button; ImageView res4; TextView T1; private static final String TAG = "training"; private BaseLoaderCallback mLoaderCallBack = new...
View ArticleHow to put a label of type string in a matrix (KNN)
This line put a label for a trainData mat train_labels.push_back(new Mat (1,1,CvType.CV_32FC1,new Scalar(i))) I would put a string label instead of a float label .is it possible ?
View ArticleHow to hide camera in opencv android 3.0?
Hi, I am trying to hide camera display in opencv3.1.0 android/java. I have CameraBridgeViewBaseif I set its visibility to GONE or Invisible OnCameraFrame method is not firing in my activity. And if...
View ArticlefindEssentialMat gives wrong results in android
Hi, I am trying to create a visual odometry app for android using NDK. I am using FAST and KLT and then using findEssentialMat to find the essential matrix. However, it is giving erroneous results....
View ArticleUse OpenCV without any external installation Android
Hi, I'm using OpenCV on Android devices. I have 2 kinds of problem using OpenCV libraries: 1. If I'm trying to download the OpenCV package by using the apk file, The user interrupted twice, first, he...
View ArticleUnity mobile camera lag Facetracking
I´m trying to build a facetracking app, but when the camera track the face with FaceTrackerARSample script, the fps are very low and it´s impossible to run it without lag. I play it on android device...
View ArticleAndroid QR code detection/extraction using OpenCV
I am trying to develop an android application to decode QR codes, however i do not want to use libraries such as zxing, i must implement it. The main problem i am having is how to perfectly extract a...
View Articlewhich method is better SVM,KNN or neural network for letters recognition
i have to recognize letters in a picture taken with android camera and i should use machine learning .I can't choose the best method .
View ArticleHow to recognize all the letters in a picture with opencv , KNN and java
i have to write a java program that recognizes all the letters in a picture taken with android camera .I tried KNN method but i could only recognize a single letter in the picture and i want to...
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