executing stitching example throws error: (-2:Unspecified error) OpenCV...
following these steps i had compiled the "stitching.cpp" example: g++ stitching.cpp -o stitching.o -c -Wall -I/usr/include/opencv -I/usr/include/opencv2 g++ stitching.o -o stitching -lopencv_stitching...
View ArticleMake the background of the image transparent using a mask
Greetings. How can I make the background of the image transparent using a mask, not a threshold. The essence of the program is as follows: I get the image and try to cut the object from the background....
View ArticleChange a particular color in an Image Python
Hi there, I have an image and I would like to change a particular colour on that. Particularly, the image contains a set of colours I have used a means algorithm in order to obtain the whole set of...
View ArticleCan I change the fps of a video dynamically?
I am using VideoWriter in python with opencv3.4. I wanted to change the fps of a video dynamically. Presently I am using `out = cv2.VideoWriter('output.avi',fourcc,60.0, (848,480))` where `60.0` is...
View ArticleVideoCapture.read() freezing when reading from gstreamer
Hello, I've recently encountered an issue where the cv2.VideoCapture.read() function seems to freeze when reading a gstreamer pipeline. The stream seems to work in a glitchy manner for a few seconds,...
View ArticleHow to use a keras custom trained classifier's .pb file inside OpenCV DNN module
I'm having trouble using the .pb file generated with keras, I think this is because I don't have a .pbtxt file but I can't generate one for that I would need a .config file and a relevant script (all...
View ArticleImage substraction
I am working on a college project, I am trying to detect damage on the surface of a marble. I am working with OpenCV 4.3.0 I have converted to HSV carried out erode and dilation and isolated the...
View ArticleAGAST vs BRISK detector in opencv
After reading the paper on BRISK, I understand that BRISK uses a modified version of AGAST. So my question is if I use only the BRISK detector(OpenCV implementation), would it be different than the...
View ArticleWhich algorithm are implemented in cv::reg::Mapper classes?
Hello, I'm working with cv::reg::Mapper classes and it works quite well but I really need to know wich algorithms are implemented in it. In particular in cv::reg::MapperGradSimilar. Thank you
View ArticleRobotprogrammering
Hej Jeg er helt nybegynder inden for robotprogrammerings området , jeg er i tvivl om hvilken programmeringsprog som er en god ide at begynde med. Er der nogle som kan hjælpe mig med mit problem?
View Articlepaper detection on image taken from android's camera
I found below code for paper detection ,for the image taken from android phone's camera ,but it doesnot work on certain cases when image is at a crooked or when corners are not distinctly visible .Any...
View ArticleAre minor subversions of OpenCV ABI compatible?
I am building a library that internally uses OpenCV. On my development machine I have OpenCV 3.2 installed, but on some my target machines the version of OpenCV is 3.3.1. (And I cannot control what...
View ArticleUnable to access a logitech 270 webcam through openCV
Im running Ubuntu 18.04, OpenCV 2 Upon trying to use the regular VideoCapture(0), an error pops up as follows: ROR: V4L2: Pixel format of incoming image is unsupported by OpenCV Upon running $v4l2-ctl...
View ArticleLiquid detection on surface
Hello All, I am trying to detect if a part of surface is wait or not and can we identify the level. Surface can be wait because of any type of liquid like water or paint or oil or chemical etc. What...
View ArticleHow to extract the profile data from the Mat?
Hi all. I have a question about extracting profile data from the Mat. I would like to set the line and extract the profile data from belonging to the line. The following image is an example of what I...
View ArticleDNN face detection in UWP/C++: strange output
Hello, I'm using OpenCV and Cafe to perform face detection on some images I receive from a stream. First, I tried with python: prototxt_file = 'deploy.prototxt' weights_file =...
View ArticleCan i use openCV to run keras models using Theano as backend?
I am having a few diffuclties using tensorflow as a backend, because i am having a hard time importing the library. So I changed the backend to Theano, but I am not sure if I can later use models...
View ArticleHow to include the correct directory for OpenCV on raspberry?
I installed the openCV to my Raspberry following this [tutorial](https://qengineering.eu/install-opencv-4.2-on-raspberry-pi-4.html) but the files went to directory: `usr/local/include/opencv4/opencv2`...
View ArticleNon rigid registration
Do opencv have the means to perform non rigid registration like ImageJ BUnwarpJ plugin (2D image registration based on elastic deformations represented by B-splines)?
View ArticleUndocumented HighGui functions
There are some functions in the HighGui module that lack any explanation/documentation. I'm speaking about `startloop`, `stoploop`...
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