ndk-build tutorial-4-opencl
Hello everyone, I was searching around for ways to use camera2 with OpenCV, and came across [this tutorial](https://github.com/opencv/opencv/tree/master/samples/android/tutorial-4-opencl). However,...
View Articleinstall opencv 2.4.13 in ubuntu 16.04
i have recently updated in ubuntu 16.04 ,and now i am facing a lot of problem to run opencv can someone give me proper and clear instruction/steps on how to install opencv on 16.04
View ArticleError building opencv 2.4.13 with Qt mingw
Dear All, I am trying to configure OpenCV 2.4.13 with Qt MinGW. The config with CMAKE was successful, however, when I try to build with mingw32-make command I get the following error:...
View ArticleHow to tranform image in negative like the camera effect-negative
Hi, I want to transform the rgba image and apply a nagative-effect. Can i do this with OpenCV ? If yes. How ? Thanks
View ArticleAssertion failed on picture size (31 px, #), cv2.canny in opencv 3.1
**System:** - opencv 3.1 - mint 17.2 - python 2.7.6 - pycharm 2016.2 prof - ipython 5.0 **Error message taken from ipython:** OpenCV Error: Assertion failed (0 <= _rowRange.start &&...
View ArticleHow to make image of template matching result
Hi, I wanted to know that how can we extract the image out of the result we get by matchTemplate method of opencv. I don't know how to use its location to make an image (colored), we can though put a...
View ArticleAnderstanding of the frame Format on Android
1) we get the frame in RGBA format via inputFrame.rgba(); 2) we must transform to Imgproc.COLOR_RGB2GRAY to process Imgproc methode. 3) We got a destination Mat in output of a lot of method. Witch are...
View ArticleWhy tutorials compile and exit without any explains
Hello comrades. Please help me. Win10, VS 2012 Express. I try to learn OCV. I use just one C++ file in the project, copy tutorial examples from tutorial dir, to this file and try to compile....
View ArticleBisect Video Feed - Zed Camera
**Background:** I was given a Zed Camera with the task of using it as a stereo camera. StereoLabs provided a proprietary software which requires CUDA (NVIDIA hardware-dependent software package) to...
View ArticleHardware requirements to run Opencv in a Android platform
Hello, I'm developing some apps using Haar Cascade for Android and I want to know which is the cheaper smartphone that can execute them. Does anybody know what are the minimum hardware requirements to...
View ArticleAndroid Camera2Renderer can't find the correct resolution
Hi, I'm trying to run this opencv4android example (android tutorial 4): https://github.com/opencv/opencv/tree/master/samples/android/tutorial-4-opencl The project compiles fine, but when i tryied to...
View ArticleMat image creation from buffer data
Hello, I have float x, float y, float z values of an image. I want to construct a 16 bit png depth image by copying the z values. The image I am getting as a result has some invalid points. Below is my...
View ArticleRefining Camera parameters and calculating errors
I've been trying to refine my camera parameters with `CvLevMarq` but after reading about it, it seems to be causing mixed results - which is exactly what I am experiencing. I read about the...
View Articlecudacodec::VideoReader returns 4 channels
Hi, the regular video reader returns 3 channels (BGR) but the gpu version returns 4 channels for the same video. Is there any documentation that could help me understand what format is it returning...
View ArticleCant compile opencv3 on ubuntu
Hi guys and gals, Ive been trying to compiles opencv3 on ubuntu and am hitting this error: *** No rule to make target `/usr/include/../lib/libavcodec.a', needed by `lib/libopencv_videoio.so.3.1.0'....
View ArticleHow to know what to #include for a given function ?
I am using opencv 2.4.13 and I want to use SLIC I googled OpenCV SLIC and I get to this page http://docs.opencv.org/trunk/d3/da9/classcv_1_1ximgproc_1_1SuperpixelSLIC.html#details&gsc.tab=0 Now it...
View Article[Need help]: Converting floorplan (image file) into data model.
Requirement is to identify different sections (bedroom, balcony) of floor map, calculate area and label them. Can someone help me or give ideas how this can be achieved, appreciate you in advance....
View ArticleConvert org.opencv.core.Point[] pointsTmp to MatOfPoint2f
Hi, I need to convert an org.opencv.core.Point[] array to a MatOfPoint2f array, And i can not find a way to do it. This is my org.opencv.core.Point[] array named pointsTmp org.opencv.core.Point[]...
View ArticleCause of unknown exception in detectMultiScale
I use OpenCV in Java. With this call: faceDetector.detectMultiScale(m2, faceDetections, 1.3, 4, 0, new Size( 10, 10), new Size(200, 200)); I get the following error: Exception in thread...
View ArticleColor Circle Tracking
hi, i m trying to track red circle from cam. i find and draw circle but problem is detecting is not stable , if camera and object both are still detecting circles position continuously fluctuate . plz...
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