Webcam window doesn't respond (C++)
Hello, I am new to openCV and even though I have managed before to make my webcam work fine in a previous project, I started writing today something new in which I am trying to get 2 following frames...
View ArticleReact Native and opencv
Has anyone heard of this before? https://facebook.github.io/react-native/ I'm building an app that needs to do image recognition, then find an image match based on a small number of pre-set images....
View ArticleMorpho filter reduce sharp
Hi everyone, How I can restore the sharp of a triangle after use morpho filter, My program as below: erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(size, size)));...
View Articlemoney bill detection
i want to create an application that takes a picture of a bill and tells the user to which country this bill belongs to and how much is it worth . any ideas??
View Articlei cannot configure opencv With cmake
[Untitled.png](/upfiles/14753196663440797.png) i am facing this problem..... plz help me.....
View ArticleStoring frames from large video [Memory issue]
Hey guys, I'm investigating how I can process video frames in bulk. Once I have my frames, I intend to just greyscale them and reconstruct the video. But what I'll add more to the process once this is...
View ArticlePlease How can i compare finger prints
Hello Please i am working on a school project where by i want to compare scanned finger prints in my database to new finger prints to see if they much. Please is there a way i can achieve that? Thank you
View ArticleProblem with contourArea return value
Hello, I'm trying to use the contourArea fonction in ordre to remove the "too small" shapes but when I'm running the above code I'm obtaining this king of results : "contour 1 color 125 area 1" or more...
View ArticleIf multitracker's update function returns false, how to tell which object...
According to cv::MultiTracker Class Reference http://docs.opencv.org/3.1.0/d8/d77/classcv_1_1MultiTracker.html#a1386c7c7c3b5418f0f65a03b93cc5c65 bool update (const Mat &image) returns just a...
View Articlehello, i m using open cv 2.4.13 and codeblocks-16.01mingw-setup, i cant...
hello, i m using open cv 2.4.13 and codeblocks-16.01mingw-setup, i cant compile the simple program, please help me , tanks
View Articlekeeping the alpha channel in transparent image mat
How do you keep an image's transparent background or alpha channel? i.e., Canny input: .png with existing transparent alpha channel background. I'd like to figure out how to get the latter output...
View ArticleShutdown camera in VideoCapture java wrapper is not possible
I tried to experiment with VideoCapture class in java. It looks like there is a bug - it is possible to open the camera but closing is not possible. For example, this code leads to java crash ():...
View Articleproblem in displaying video stream window in face detection python
hey i just want some help this is my code but i do not know how to display the video using imshow or anyother method. it was working fine but as soon as i put all the code into processes it is running...
View ArticleBest way to calculate speed of a Bowling Ball
 I am working on detecting Bowling Lane and Ball on it and my final objective is to calculate speed of the ball between two fixed points (see two...
View ArticleDrawing an outline on outside contour
How does one draw an outline on the outsider edge of a contour?
View Articlehow to linearize light during a dayt whit abs_exposure camera parameter
Hi, On my camera I can use only gain and abs_exposure parameter (V4Lc linux ubuntu) ... my problem is change abs_exposure parameter duringa a day from 160 to 600 automatically (These values have...
View ArticleCan't find "modules/dnn/opencl_kernels_dnn.hpp" for SURF opencv
Hello! I am trying to use the SURF algorithm from opencv_contrib git:https://github.com/opencv/opencv_contrib. However, when trying to build the repo I have the error:...
View ArticleCreating a focal point service that only responds w/ coordinates
I'm looking to create a simple HTTP service where you post a URL to an image, and in response it would simply reply with the coordinates of the image's focal point (not so much recognizing a face or...
View ArticleCalibration with findCirclesGrid - trouble with pattern width/height
Hi, I'm calibrating a GoPro Hero 4. I have calibrated using chessboard pattern. I would like to see if I can get a better calibration with the circles instead. However I'm having some problems...
View ArticleShape is transformed
Hi everyone, I have a blue Rectangle, in a short distance, I can recognize it by findContour with threshold method. but if I increase the distance, the shape after thresholding as below: ![image...
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