How to offload imaging processing to worker
Hi All! I've run into a little predicament. I'm trying to: 1. Use CameraBridgeViewBase in my main activity to grab images 2. Use a Worker class to process the images 3. Draw the processed images back...
View ArticleHow to properly install opencv 3 with QT on Raspberry
HI all, i want to install opencv 3 with QT enabled on my raspberry B+ , any suggestions or links to do all the procedure thanks
View ArticleMac 10.10.4, opencv3.0 in qt creator can't use imwrite
In my program, I want to use imwrite to save a picture, but I got two compile error, which says: error: symbol(s) not found for architecture x86_64 error: linker command failed with exit code 1 (use -v...
View Articleno matching function for call findcontours
Hello, I'm currently developing an application with openCV for IOS on Ipad. My work is based on the sample call 'Chapter13 : saving video' from 'Instant Opencv for iOS' book. I would like to process...
View ArticleOpenCV 2.4.11 GPU features
Hi all, I have a Alienware laptop with 2 x GTX880M (SLI) with Windows 10. I have recompiled OpenCV 2.4.11 with CUDA and Cublas option. I'm using CUDA 7.0. I do the same on another computer which have...
View ArticleHOGDescriptor::detectMultiScale parameters
Can someone tell me the parameter ` win_stride` and `padding` parameters? I see the parameter `block_stride` in the constructor. Is it the same as `win_stride` in the detect* functions? If so, why this...
View ArticleOpenCV 3.0 with VS2013
Hi guys, here's what I'm trying to achieve: I'd like to start doing some object tracking with a webcam with OpenCV 3.0 powered by VS2013. After viewing the tutorials, I got to view my webcam quite...
View ArticleHow to flip a camera calibration?
Hi, I have intrinsically calibrated a camera using chessboard images. If all the input images are then vertically flipped, does anyone know how to programmatically calculate the intrinsic camera...
View Articlecamera rotation and translation based on two images
Hello, I'm just starting my little project in OpenCV and I need your help :) I would like to calculate rotation and translation values of the camera basing on two views of the same planar, square...
View ArticleImage rectifying using homography matrix
Hello! I'd like to transform an image using homography matrix. That is, when I have an image taken at a certain position and attitude, I want to get an image taken at a different position and...
View ArticleHow can I resize an image from the center?\
Hello! I have a contour, and I want to resize this contour and then draw the resized contour in same image, In another words, I want to create an external contour to the existent one. To this I need to...
View ArticleHidden Markov Model implementation
Hi guys, I have created and trained an HMM in matlab and it give quite good results. What i`m strugling to find is an implementation of HMM in opencv. Does something like this exists or I should be...
View Articleopencv 3 java face recognition example requested
For now on opencv 3 I'm succeeding face detection. but I could not even start face recognition. I could not find facerec.dll and I do not have the compilers to have it from cpp files... Can somebody...
View ArticleError building OpenCV 3.0.0 with FFMPEG
Hello, This is my first question on this forum. I have been using OpenCV for a while. However I have recently changed my system to a cluster where I do not have any admin permission. The problem is...
View ArticleErrors with installing OpenCV 3.0.0 on Ubuntu 12.04.
Hi. I have no experience with OpenCV. I'm trying to install OpenCV on Ubuntu 12.04 but am encountering errors. To install OpenCV, I am following instructions at...
View ArticleHow do I train an ANN to deal with diverging inputs
For inputs: Let Y be results axis from data from various samples, influenced by one known variable and other uncontrolled conditions. There will be regions on the X axis (the control variable) where...
View ArticleGPU/CUDA CascadeClassifier detectMultiScale Slow Performance
I was trying to improve the face detection (HAAR face frontal dataset) performance, so I switched the regular CascadeClassifier::detectMultiScale API to the one under gpu (CUDA) module, and the result...
View ArticleWorse performance of LUT function on Android Lollipop
Hello, everyone! I was developing a project using OpenCV for device LG G3 with Android 4.4.2 and OpenCV 3.0.0. The average execution time for the LUT function used to modify input image (size 9...
View ArticleOpenCV 2.4.10 + Maxwell gpu cmake = error
I installed a NVidia Geforce GT750Ti with Auto and PTX=5.0, ArchBin = 2.0 - 5.0. My CUDA version is 7. I tried out some functions. For some reason, my gpu::transpose and gpu::flip functions runs fine,...
View ArticleList of which functions use IPPCV?
In the 3.0 release notes it says "a subset of Intel IPP (IPPCV) is given to us and our users free of charge, free of licensing fees, for commercial and non-commerical use. It’s used by default in x86...
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