Recognize traffic signs in a photograph
Recognize traffic signs in a photograph #!/usr/bin/env python3 # -*- coding: utf-8 -*- import cv2 import numpy as np import glob while (True): red,frame = cv2.imread("14.jpg") cv2.imshow("Frame",...
View Articledatatype CV_16F in opencv.js
Hi everyone, is it possible to enable the new datatype cv.CV_16F in the webassembly version of opencv 4.0? I know that this is meant for GPU-based computing. However, given the fact that webassembly...
View ArticleUnclear how calibrateCamera estimates stdDeviations (perhaps wrong)
Hi, I'm researching camera calibration and uncertainty propagation. I'm trying to understand how calibrateCameraExtended estimates stdDeviationsIntrinsics and stdDeviationsExtrinsics. [The...
View Articlepathname in imread()
I am giving a path name for img = cv2.imread('',1) but while checking print(img) I am getting none message I am coping the pathname by using-shift+rt click and copy path to get it but everytime I am...
View ArticleTypes of Mats and decision making
Hi, I know that Mat has many different types, as detailed below. Its puzzles my how one should decide which one of those to choose ?. Just image quality ? what is the correct way to convert from one to...
View ArticleConfiguration Error CMake 3.15.14 opencv contrib
Selecting Windows SDK version 10.0.16299.0 to target Windows 6.1.7601. Detected processor: AMD64 Could NOT find PythonInterp (missing: PYTHON_EXECUTABLE) (Required is at least version "2.7") Found...
View ArticleCamera Calibration Takes too long
Hey, I am currently working on implementing open Cv/ARuco to Unity3D using C#. I have managed to track the markers in 3d space and get the 3d pos (position/rotation). However i noticed that the...
View ArticleGuidline in building Object detection and its direction.
I am trying to build object detection and its direction ,The shape of Object can be anything. For example let say i am showing the water bottle or chocolate or any object in front of webcam and i want...
View ArticleC++ compilation issue migrating from 3.4.3 to 4.1.1 on Android
I am upgrading an Android JNI project from OpenCV 3.4.3 to 4.1.1. When building an issue came out : error: undefined reference to 'cv::dnn::dnn4_v20190621::Net::setInput(cv::_InputArray const&,...
View ArticleError: Cannot find NvOf library.
Using Samples of cudaoptflow, I am trying to run Nvidia Optical Flow sdk. **code :** while(1) { Mat frame; cap >> frame; //read every frame if(frame.empty()) break; Mat reference_image =...
View ArticleCan I use cv2.putText on a window without an image?
Or is there any alternatives for me to do so? Thanks!
View ArticleProblems with Qt and dnn module
Hi people, I am having problems with my Qt app where I declare "cv::dnn::Net net" object. By just declaring it is enough to cause my app crash at runtime. I use Qt5 and OpenCV 4.1.1 64 bits compiled...
View ArticleWhat backend API to use with DAHENG MER-132 USB3 Vision camera
Hi, I have a DAHENG MER-132 USB3 Vision camera which I am trying to access with opencv (python 3.7, Win 10). I followed some example code to get my webcam working with `capture = cv.VideoCapture(0)`...
View ArticleInstalling openCV from source troubles
Hi everyone, I am an electrical engineering student who is looking to convert my computer vision project from MATLAB to Python and openCV but am having trouble doing so. I've gotten close with the...
View ArticleGetting error with freeType -> putText function
I am getting an error no matching function for call to ‘cv::freetype::FreeType2::putText(IplImage*&, cv::String&, CvPoint&, int&, cv::Scalar_, int&, int&, bool) for the...
View ArticleHow to install OpenCV on Windows xp 32 bit
I'm using Windows xp 32bit, and I have installed python 3.4 on it.. But I'm getting problem to install OpenCV - python on my system. I have tried to copy .pyd file in site libraries too but still it's...
View ArticleBuilding Error VS 2017
Hi I have some trouble with building my opencv on a windows. I will attache the CMAKE log file and the Output build from VS2017. Please rename the files to .txt...
View ArticleMeaning of Input Array and noArray()
Hi In the wiki I found the following description of a function: C++: Vec2d EM::predict(InputArray sample, OutputArray probs=noArray()) what does it mean exactly? I.e. a) What exact type can...
View ArticleKCF is not correctly finding tracked object
When I pass a frame and a bounding box to trackerKCF init the tracker properly initializes. If the tracked object has moved before calling the first update, the update returns a true and the bounding...
View Articledoes JetsonTX2 support CV.dnn ?
I ran this code [Real-time object detection with deep learning and OpenCV](https://www.pyimagesearch.com/2017/09/18/real-time-object-detection-with-deep-learning-and-opencv/), Numbers of the frame per...
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