How to convert Mat inputFrame to 8UC3?
Hello, I'd like to convert Mat inputFrame to 8UC3. But I don't know how to do it. Specificaly, I use javacamera and I want to convert inputFrame to 8UC3 and substitute inputFrame(8UC3) for...
View ArticleHow do I support c++11 in Opencv 3 Android NDK
Hi, all I am doing the next changes to support c++11 with opencv 3 in android NDK: I change from APP_STL := gnustl_static to APP_STL := c++_static Application.mk APP_STL := c++_static APP_CPPFLAGS :=...
View ArticleApplying NDVI indicator on JPEG images in Android using OpenCV
I am a beginner in image processing. I have a set of survey images of a farm which I have stitched (eliminating the overlap) and the result is one single image (JPEG) of the entire farm. I want to...
View ArticleHow to Manually Change Exposure Value in Android
I'm trying to disable auto-exposure and manually set an exposure value in the color-blob-detection sample provided with the SDK. Is there a way to do this via OpenCV or the native Android Camera2 API?...
View ArticleHow can i use opencv FloodFill with java?
I tried to use floodfill in my source code but the application doesn't work and this is my code : `final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),options); Mat tmp = new...
View ArticleHow can I connect to an ip camera using java in android eclipse?
Dear users I'm trying to connect to an ip camera using opencv android 2.4 in eclipse. I read some resources but I couldn't find any clear code to do it. can someone help me?
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Tips For Saving Your Battery
It's incredible to consider exactly how much technology has come the years. It feels like as time takes place, technology is being boosted at a quicker price compared to ever before. Take mobile phone,...
View ArticleHow can I connect to an ip camera using java in android eclipse?
Dear users I'm trying to connect to an ip camera using opencv android 2.4 in eclipse. I read some resources but I couldn't find any clear code to do it. can someone help me?
View ArticleHow to determine an image with strong or weak illumination in android API please
I need to analyse an image and see if it has a good level of ilumination, but I need to do that in Android.
View ArticleHow to integrate OpenCV Manager in Android App without ask user to install...
Hello I need a way to instal the opencv manager within the host app without install a second app for it, that works well in production. Kind regards.
View Articlewhy imread return empty matrix
l'm work on android app with opencv 2.4.9 and in jni function l try to read images from database l test simple one Mat testSample = imread("/storage/emulated/0/h.jpg"); l search online but can't solve...
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 ArticleHow to convert Camera frame to Video in android?
I need to convert camera frame to video . how to do it ? . is there sample code for this?
View ArticleBuilt library is twice as large as the distributed one
When I use `cmake` to build `libopencv_java3.so` in release mode with default configuration I got a library of **17MB** I can reduce that to **10MB** by adding some flags and disabling some modules....
View ArticleLoading video files using VideoCapture in Android
Hi, My aim is to load two video files, grabbing the frames from each file and creating a single frame. I have understood I can use `VideoCapture` java class to load files and use `Mat` class to work on...
View Articlebuild OpenCV 3.1 for android with openCL support
Hi All! I tried OpenCL on my OpenCV project and the result is a huge improvement in terms of performance so I would like to try OpenCL on android. I use this...
View ArticleIt is possible to know how much of a given color is Required to If you come...
My question was a bit confusing. I'll explain the situation. I have 1 color, which is the result of mixing other 4 colors. Since I am new to the forum, I can not Attach the image in that question, But...
View ArticleOpen cv image proc on iOS and Android framework limit size.
I want to be able to only use a couple of image processing components in my app. I am limited by the size of what I can use as it is part of an SDK. How would I go about compiling just the canny edge...
View ArticleCannot load SVM .xml file in OpenCV 3.2.0 Android
I have problem with loading saved .xml file for my SVM predictor after upgrading OpenCV version to 3.2.0. The error I get is following: java.lang.UnsatisfiedLinkError: No implementation found for long...
View ArticleImproper Computation of NDVI
I am new to image processing. I am applying NDVI index on an image of an agricultural farm taken by drone. But the formula (NIR-Red)/(NIR+Red) is giving me wrong output (here instead of NIR we are...
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