Detect blur, sharpness of the single image
I am trying to create validation of the image into my mobile application for different platforms(iOS, Android, etc.) Googled a lot I found some solutions and snippets but unfortunately they are not...
View ArticleWhere are built in functions for android?
Every builtin function I search, are either given in c++ or c or python. How to use them in android? Like I want to convert RGB to LAB color space, and I found...
View ArticleExposure Fusion createMergeMertens not working in 3.1.0
I have a simple Android application, running proper with OpenCV 3.0.0, but crashing in 3.1.0 with error FATAL signal 11. Is there something wrong in 3.1.0 library ? List images = new ArrayList();...
View ArticleBlue image when using VideoCapture
I'm using the cv::VideoCapture class to access the video stream in a native C++ application. If I test the application on my desktop application then the image looks fine, but when running on my...
View ArticleUsing c++ with android camera
I've recently discovered openCV and I am trying to write an application that snaps a quick picture from an android device but it must be written in c++. Should I still be using the openCV for android...
View ArticleI want to multiply a matrix with a number !
I am using opencv in android studio. i want: Mat A; Mat B; int num= 255; B = A*255; But it is not working.
View ArticleDetect tilted face
Hi I am trying to detect the tilted face using `Opencv4android`. I have run `face-detection-sample`, I have noticed that when face is straight, its detected but when the face is right/left tilted or...
View ArticleDetect real time face only
Hi, I am trying to detect real time face detection. I have run `face-detection-sample` but the problem is sample is also detecting the faces from images as well. `How can I setup Open CV to detect...
View ArticleHow to get actual height and width of object in the image in android OpenCv?
I need to calculate actual object width and height that displayed in the image.My purpose is to calculate the wound's height and width in human body without knowing any thing such as focal length,...
View ArticleRodrigues giving empty Matrix
Hi, I'm implementing markerbased tracking on Android and I'm stuck at the rotation matrix. Up until the solvePnP everything works fine and I get results (rvec, tvec) that seem legit. But after using...
View ArticleUsing SIFT/SURF obj. detection with Android
Hi guys, I'm working again on a shelf detector (detects product on a shelf and cut them into images) but the last approach (using hist inspection, as mentioned in my previous question) did not suited...
View ArticleHow to calculate camera focal length in OpenCV
Hi all, I wan to get camera focal length in OpenCv. I am using java code in Android.
View ArticleOpenCV4Android - Extracting the outer edge of a circle.
So I have a set of images with a single circle on them in roughly the same location. On the edges of those circles I have various colors. What I need to do is extract outer 100px of that circle and...
View Articlehow to calculate real object width and height with known distance ?
Hi all, I want to calculate real width and height of the object, I can give distance of objects from camera, please help any one to find the solution..
View ArticleHelp required converting a few lines of Python to Java (Android)
Hi, I've been trying to implement the following Python example from the OpenCV docs into Java for OpenCV4Android:...
View ArticleNeed Advice for a Funded project.
Hi Folks, Pls can anyone suggest me a good camera for following requirements : 1) Should stream to PC like a webcam. 2) Should have more than 30x Zoom 3) Clear 4) compatible with OPENcv. Pls help me...
View ArticleProblem with FaceRecognizer
So I got the 2.4.11 OpenCV library for Android. I am trying to use the org.opencv.contric.FaceRecognizer.java But, I do not understand how do I initiate an instance of that class since this is the...
View ArticleMatlab haar cascade opencv android compatibility
I trained a haar cascade classifier in matlab. I want to use the model(xml file) in opencv with android. The xml file says its compatible with OpenCV 2.4. I am using OpenCV 3.0 in android. Will it have...
View ArticleWhat is the best way to stock data on android apps?
I am a beginner on android developpment,i should developpe an application that works without connection .What's the best form of data that i should use( json,sqlite or Firebase)?
View ArticleOpenCV4Android Camera Calibration sample error
I tried to run the Camera Calibration sample code from OpenCV4Android 3.0.0, Im using android studio. When I run the apps on my android devices the sample code can detect asymetric circle grid pattern...
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