qt 5.7, opencv 3.1 and win 10
hi using MinGW and Cmake I built opencv (with Qt option) and now trying ro run sample program. Here is the code #include #include int main() { cv::Mat image=...
View ArticleIssues with opencv on a RPI3
I'm trying to run face-detection-node-opencv on a RPI3 for a school project. I succesfully installed opencv 2.4.9 and the node-face-detection but I got an error when i'm trying to access to the cam...
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 ArticleFatal error detected on SVM
# A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007f68840000f8, pid=13617, tid=0x00007f688b290700 # # JRE version: Java(TM) SE Runtime Environment...
View Articlepng to grayscale conversion offset by 1 in pixel intensity
hi I am running opencv in ubuntu 14.04 Here I am reading a png file and displaying it , printing value of b,g,r channel at pixel and converting to gray scale (file not changed on disk only in memory)....
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 ArticlePlatform independent way to determine the min and max values of CV_ types
What's the best possible way to determine the min and max values that can be stored in a datatype? For example, CV_16U can store values between 0 through 65535 inclusive. I tried searching for OpenCV...
View ArticleHow to play a video with a fixed fps?
I am extracting frames from video using the following code. However, i want a fixed fps(fps=10) for every videos used to extract frames, but it is not giving me the same number of frames for each...
View ArticleError in Using TrackerKCF in Ubuntu /Linux
I have built successfully OpenCV 3.2 with the extra modules contribution successfully on Ubuntu. However, I'm having an error when building a code that uses (TrackerKCF::MODE), although this code was...
View ArticleHow to detect gun on gray scale image with opencv c++?
Hi' I'm new in opencv c++. I want to detect gun on gray scale image with opencv c++ but I don't know how do it. This is my original picture: s5.picofile.com/file/8286154918/3.jpg...
View ArticleHow to integrate opencv manager in android app?
Can you, please, describe the process step by step?
View ArticleFilter android video from sd card
I want to filter video which play exoplayer like Instagram. so some suggest me to use OpenCV but I don't know how to start in OpenCV use android camera filter. I want to filter video which store...
View Articlehow to detect motion in java?
i have opencv 3.2 and the highgui class is deleted and i cant use a lot of fonction and static variable.....
View ArticleGrab second largest contour from max()
I'm completely new to OpenCV and Python (Java Developer) so It'd be much appreciated if detailed instructions were included. Thanks. Okay, My goal is to grab two contours (same color) that are the...
View Articlei have this Error: Assertion failed (scn == 3 || scn == 4) in cv::cvtColor
i'm trying to face detect and motion detect for my internship... here is my code.... public class FaceDetect { private Button cameraButton, cropButton, pictureButton, close, compare; private ImageView...
View ArticleHow use sterio Camera with two images in the same frame
I bought a stereo synchronized camera where the two images (left and right) are together in the same frame. My application was written in java using OpenCV 3.1.0, my computer is a macbook pro 2014....
View Articlerobot arm plays chess with recognition of chess pieces.
Instead of building a chess board with sensors would like to have chess pieces which are like checkers with standard chess piece identification printed on top of checker. Any ideas on best coloration...
View ArticleVLFeat K-means: how to use in c++
I've read of VLFeat, which has an implementation of the algorithm of k-mean, which is faster than that of OpenCV, but do not understand how to readjust this code (in c++ and OpenCV) to use VLFeat. Mat...
View Articlelow time performance on Ubuntu 14
Hello everyone, I have a very unusual issue with OpenCV 3.2 on my Ubuntu 14 machine. Time performance for image pre-processing functions such as CvtColor and remap is a way lower as compared to the...
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