Brox Optical Flow - Python Binding
Is there any Python binding available for Brox Optical Flow in OpenCV 4? Thanks
View ArticlefindChessboardCornersSB irregular behavior
I am testing **findChessboardCornersSB** as an alternative to **findChessboardCorners', mainly to be able to use a calibration target which may overlap the image boundaries. While it works like...
View Articlecan't find QuasiDenseStereo in opencv_contrib_python
Hi everyone, It's very possible I'm overlooking something, but I can't seem to find the Quasi Dense Stereo implementation in opencv_contrib for python. It's part of the `stereo` module in contrib....
View Articledetect pixel difference in gray scale image
 I have convert image to gray scale image and the result in shown below. is there a way to detect the difference between the tow sections, or...
View Articlehow to solve (-215:Assertion failed) !empty() in function...
please help me i got this error. --------------------------------------------------------------------------- error Traceback (most recent call last) in 19 20 rerect_size = cv2.resize(im, (im.shape[1]...
View ArticleWhat is the length of the tape/strip from the image?
Problem explanation: 1. tape can be in any position of the image 2. Position can vertical / horizontal for tape Condition: Is to do without using a deep learning model only with help of OpenCV my...
View ArticleFastest way to convert BGR RGB! Aka: Do NOT use Numpy magic "tricks".
---------- **IMPORTANT:** This article is **very** long. Remember to click the `(more)` at the bottom of this post to read the whole article! ---------- *I was reading this question:...
View ArticleHow to color the pixels in an image depending on whether they are...
I am converting an input ROS image to OpenCV, drawing a circle on the image, and removing points outside the circle. I want to be able to color the pixels in the image depending on whether they fall...
View ArticleWhy is a contour from cv2.findContours() in a shape like [N,1,2]?
Hi, guys, I am a learner of OpenCV, and I found the returned contours from cv2.findContours() are in a a shape like [N,1,2]? And I want to know why not using the shape as [N,2]? What is the reason for...
View ArticleunwrapPhaseMap() does not take ndarray in Python
Hi there, I'm doing some structured light and fringe analysis work and am trying to use the phase unwrapping function cv.phase_unwrapping_PhaseUnwrapping.unwrapPhaseMap in OpenCV (4.4.0) with Python...
View Articlehow to create an image box in python using tkinter
Hi guys, I was developing an application, i was to create a desktop based application, it is about face recognition, i have a problem that i still can not solved , i was newby in python , I want to...
View ArticleIs multithreading handled differently in Python and C++?
Hi there! I recently built a simple OpenCV-application in Python, that uses ORB and a BruteForce-Matcher to compare image-pairs that live in two separate datasets. The code for that was as follows: def...
View ArticleImage frame saving from Video without losing resolution and quality
I want to save the images extracted from the video without losing any information, resolution and quality. I have saved using OpenCV in four formats `png, bmp, jpg, tif` The code is as below file =...
View Articlepython: How to Crop White region from Number Plate image??
Hey I want to crop white region from image and show the characters written in white region on screen. Here is my code import cv2 import imutils # Read input image img = cv2.imread(r'111.jpg') hsv =...
View ArticleVideoWriter not working on MacOS
Installed opencv from PIP (python 3.8) and just cant write any video properly. Using this general constructor pattern: ```writer =...
View ArticleGMS-matcher doesn't write to Output-Vector
Hi there! I have two databases containing image-pairs and try to find the corresponding image for the image in the first directory by iterating over the second directory and comparing local...
View ArticleHow can I get just one rgb value in a video from ROI's center
I'm processing a video and I want the ROI's center rgb value . But, because it's a video there too many rgb values coming out from the roi's center. what should i do to get the most accurate or...
View ArticleFisheye --> Undistorted --> Fisheye
Hi all, this is my first question on this forum! I calculated the intrinsic and extrinsic parameters for my fisheye camera by the calibration script found...
View ArticleOpenCV solvePnPRansac() function
I am working on a 3D model reconstruction form multiple images project. I have the camera matrix as well as 2D-3D point correspondence. I want to compute the projection matrix. I used...
View ArticleHow to solve TypeError: Expected Ptr for argument 'src'?
I'm trying to highlight faces in a video with face_cascade. My code: import cv2 face_cascade = cv2.CascadeClassifier('D:/Anaconda/Lib/site-packages/cv2/data/haarcascade_frontalface_default.xml')...
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