Gender Detection
Hi: I was trying to follow the instructions from this site http://docs.opencv.org/2.4/modules/contrib/doc/facerec/tutorial/facerec_gender_classification.html but I am getting these error messages :...
View ArticleCapture 180 HFOV but produce video without distortion?
The goal is to create a camera system that offers 180 HFOV but produces video focused only on one part -- for instance, to cover a whole basketball court but only produce video focused on one player....
View Articleopencv_test_calib3d accuracy test failed, fisheyeTest.rectify
Dear all, I complied opencv 2.4.13 on Ubuntu14.04(gcc 4.8.2 ), and it FAILED when I ran the accuracy test **opencv_test_calib3d** . The exact failed test was **fisheyeTest.rectify**. I thought it...
View ArticleOpenCV 3.1 (C++) - SVM.load() does not set var_count correctly
Okay, I have some training data with 35 variables, I trained an SVM classifier and saved it using: svm->save("trained-svm.xml") In another application, I was trying to load the classifier using the...
View Articleopnecv build fails on rpi3 with Ubuntu 16.04 and ENABLE_NEON=ON
Hello I try to build OpenCv on my Raspberry Pi 3 with Ubuntu 16.04. But when I try to build it with Arm Neon enabled **My cmake Command is this one:**> cmake -D CMAKE_BUILD_TYPE=RELEASE -D>...
View ArticleHow to choose an appropriate set of negative samples?
So I'm not sure exactly how much time and effort I should be spending on preparing my negative picture sets. I usually just choose backgrounds that I think I'll encounter, which don't contain the...
View Articleg++ error: undefined reference to CommandLineParser
I am new to opencv, and learning from "opencv by example" book. I finished the installation and wanted to run an example : opencv_version.cpp as suggested. In the book it said I need to run this: g++...
View Articlereading a samsung recorded h.264 video
Hi, I have an issue with reading h264 encoded video recorded by my samsung S5 mini phone camera in OpenCV 3 (on my PC). I get errors like this: [h264 @ 0xc5e900] AVC: nal size 555455581 [h264 @...
View ArticleHow do I solve this issue for this Multiscale Template Matching script?
Hi! I am trying to write a python script to analyze many still images that have different logos in them The logo is not always of a fixed size and clarity is not the same either (the logo's resolution...
View Articlehandle waitkey in multi-thread application
I have a multi-threading application written in C++ with Qt5.7 and OpenNI. It has a main thread that starts a second thread which capture frame from a .oni recording file (asus xtion pro live) does...
View Articleyuv422 to nv12 convertion
yuv422 to nv12 conversion is possible in openCL? if it is possible please help me .
View ArticleCalibrateCamera returns bad intrinsic Matrix
Hey there, I'm currently working on a cameracalibration using a Chessboard. The cornerdetection works perfectly and everything runs without error, the return value of calibrateCamera() is somewhere...
View ArticleError when opencv running (visual studio c++)
I have an error with information as below: OpenCV Error: Assertion failed (dims <= 2 && data && (unsigned)i0 < (unsigned)size.p[0] &&...
View ArticleDrawing with touchscreen
Hello All, I have read the drawing tutorial, and understand how to do some basic drawing functions. I would like to draw using a touchscreen. There a library that can help me do that?
View ArticleHough Circle
Hi everyone, I have a problem that I do not understand as below: I write a program to detect the circle, my goal is detect it in binary (only black and white) image. I read some example and I can use...
View ArticleBehaviour of ORB keypoint detection with masks
I was doing some work in OpenCV 2.4.8 and I noticed a strange behaviour when detecting keypoints using ORB: `ORB::detect()` gives a different result if I use an all-permissive mask (all set to non-zero...
View ArticleIP Camera Capture delay/lag
Hello, I am trying to so some processing on a IP Camera (Onvif) output image, and it works well, but I see a lag between the real world and the video capture in about 3~4 seconds. I am using the...
View ArticleCombining FAST and SIFT: low Keypoint size
I try to combine the FAST algorithm and parts of the SIFT Algorithm to get a fast Solution for Mobile Phones. The code I created for that works like the following: - Get Image - calculate Size for...
View Articlebuild errors when building opencv_contrib from source code
I download the opencv_contrib source code from the github and try to build it. I use windows 10 + visual studio 2015, My operating system is 64bit, I choose to build the win 32 solution. I also install...
View ArticleLinker problems, OpenCV 3.1.0
I am trying to install OpenCV 3.1.0 and use it inside of Visual Studios. I've completed the installation of OpenCV, but I'm getting linker errors. I tried using:...
View Article