Android OpenCL DFT vs. CPP Version is very slow!
Hey, I've started to learn a bit about Android GPU programming and wanted to implement the DFT with the new T-API in OpenCV 3.0. My Device is a Sony XPERIA Z1 which runs with OpenCL 1.1 (on Lollipop -...
View ArticleHelp building OpenCV 3.0 with CUDA 7.0 and VS2012
I am using OpenCV 3.0 with CUDA 7.0 and VS2012 c++/cli on a Win 8.1 64 bit machine. I also have CMake 3.0.1. Previously, I was able to build OpenCV 3.0 and everything worked fine. Now, I cannot...
View ArticleHow to find source version using getbuildinformation?
Hi, In getBuildinformation I have got this two lines : General configuration for OpenCV 3.0.0-dev ===================================== Version control: 3.0.0-645-gc3eb125 Is it possible to retrieve...
View Article[android] Save and load model in opencv 3.0.0 android
I already imported opencv 3.0.0 in android but when I tried to save using svm.save("path") it got error> Fatal signal 11 (SIGSEGV) at> 0x4275bd40 (code=2), thread 27676> (nacht.opencv_as)...
View ArticleAndroid OpenCV Error: Assertion failed
I'm developing an android image processing application using Opencv. in this App I take each frame of camera and process it to find hand. I searched a lot and did some things but I couldn't solve the...
View ArticleHow to make auto-adjustments(brightness and contrast) for image Android...
i'm using OpenCV for **Android**. I would like to know,how to make **image correction**(auto adjustments of brightness/contrast) for image(bitmap) in android via OpenCV or that can be done by native...
View ArticleImread() Umat for OpenCL in Android doesn't work!?
Finally I was able to compile the Code in the Tutorial 4 of Android OpenCV [here](https://github.com/Itseez/opencv/blob/master/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp) . It works...
View Articlehow to calculate the distance between two points??
below is the source pic:  below is my binary pic after processing on android platform:  now i...
View Articleopencv brisk function refine1D?
Hello, I am a bit confusing with the brisk src code and I've found this function: inline float BriskScaleSpace::refine1D(const float s_05, const float s0, const float s05, float& max) const { int...
View Articlecan Opencv for android support GPU acceleration ?
is it only support NVIDIA for android device?
View ArticleRandom Forest predict_prob in OpenCV 3.0
Hi, I'm looking for the predict probability functionality for binary classification task present in 2.x releases. As far as I see it is gone, is there a tendency towards getting it back? Best regards,...
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View ArticleHow to define the parameter 'numDisparities' in StereoSGBM?
I'm using StereoSGBM to get the absolute location of one object. But I found that different value of numDisparities would change the matrix of disparity. For example, when I set numDisparities=64, the...
View ArticleC++ vs Python, the cost of the abstraction
Hello guys. I'm working in a computer vision software for a while, and I always used C++ to code the system. The C++ was chosen because of performance. The software works with video input and have to...
View ArticleBackgroundSubtractorMOG2 set parameters
Hi, i'm trying to use the class BackgroundSubtracorMOG2 with Opencv 3.0. After: Ptr pMOG2; pMOG2 = createBackgroundSubtractorMOG2(); I want to set some parameters like: pMOG2.setShadowThreshold(0.5);...
View ArticleDetect multiple 3d shapes in an image
I'm currently learning OpenCV for a project I recently started in, and need to detect 3D boxes (imagine the big plastic boxes maybe 3ft x 2ft x 2ft) in an image. I've used the inRange method to create...
View ArticleUSB camera disconnection/reconnection
I have a project running Python with OpenCV and Pygame under Ubuntu 14.04 that uses two USB cameras, images from which are processed and displayed on the local monitor. If the system is started with...
View ArticleTracking API
Hello, I am building OpenCV with the contrib extras in order to expose the Tracking API. Is this likely to be accelerated by the GPU as many posts have an issue with performance, even in release mode....
View ArticlefastNLmeansDenoising
The documentation says that opencv uses the NL-Means denoising algorithm with several computational optimizations. Can anyone tell me what those optimizations are?
View ArticleCalculate Log Transformation in RGB Image?
How to calculate log trasformation in RGB image? What is algorithm?
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