Questions tagged [opencv]
OpenCV (Open Source Computer Vision) is a cross-platform library of programming functions for real time computer vision.
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Image stitching using SIFT keypoint descriptor and homography matrix
I have written a code to stitch 2 images using SIFT keypoint descriptor and homography matrix for perspective transform. Are there any areas where code an be improved or optimized?
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Converting ffmpeg AVFrame Yuv420P to OpenCV RGB cv::Mat
Thanks to Rotem and his help with this issue, I can offer an implementation that allows to use cvtColor to convert an AVFrame YUV420P into a BGR ...
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Python 3 script to make photo collages
I have written a Python script that takes a list of filenames of pictures and generates a photo collage of them. This is my most complex project yet, and I have written it completely by myself (like I ...
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Control your laptop using hand gestures
This program uses webcam to track hand movements / gestures and sends corresponding mouse / keyboard events to the computer. I use it to switch spaces, move active window between desktops, scroll ...
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Matlab-like reshape in OpenCV
I am translating Matlab code to OpenCV. The code involves lots of reshaping of large matrices. As the Matlab reshape differs from OpenCV you can't just use OpenCV reshape.
Here is why: Let's suppose ...
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Bilinear interpolation optimized using intrinsics
I have found that a bottleneck of the OpenCV application I use is the bilinear interpolation, so I have tried to optimize it. The bilinear interpolation is in 8D space, so each "color" is an ...
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program which select's the ROI from un-stabilized video and Extract the ROI in diff window as stabilized ROI, wants to increase its computation speed
The problem is, program is really lengthy and computationally expensive.
So is there any way to make this program faster or any other way to write this code?
(I am beginner in python and would love ...
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1
answer
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Display Multiple Video in Window Python
I am beginner for the openCV.
I am using below codes to get four video in a file system and show to user. Like this:
V1 | V2
V3 | V4
Video length does not match, ...
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Polarimetric imaging script in python
I made this script that takes 3 images taken with a polarising filter 45° apart as inputs and outputs an RGB preview and an image which encodes the polarization parameters as HSV.
However it's way too ...
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polarimetric imager in python
My code takes 3 images taken with a polarising filter rotated 45° between them and transform them into a single image encoding the polarization parameters as HSV. what can be improved?
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How to using custom colormap with pixel calculation, gray scale value by opencv and make it workable on camera [closed]
I tried to implement the mcolor colormap in the paper
at page 8 to 10.
I developed the code to process a image file and it works ok.
Now, I want to adopt this image processing method to the camera ...
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Remove background from a directory of JPEG images
I wrote a code to remove the background of 8000 images but that whole code is taking approximately 8 hours to give the result.
How to improve its time complexity? As I have to work on a larger dataset ...
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Auto Fishing in Terraria via open cv colour detection
The code works perfectly.
It looks for a certain parts of the screen where the terraria fishing particles would be appear, after which it if the threshold is met it fishes. I was wondering if it was ...
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Looking for the particles that are emitted when a fish is detected in Terraria
The code run perfectly fine, with no errors. However, the entirety of the code is in 1 function and is kind of hard to read. As well as that I'm not sure if and how the code could be more optimised/...
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ORB Image detection and OpenCV
Working code for my image detection script. This is functional code.
I'm loading a number of images into an array, and using two classes to generate the two main components I need for my detection; <...
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Python 3 OpenCV script that scans a giant picture to make a video
This is a Python script that I wrote completely by myself. Basically it scans a giant picture to make a video.
They say one picture is worth more than a thousand words. Since a video contains ...
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Variable speed video playback using OpenCV according to frequency of mouse clicking
Here's my code - I've a lot to learn so any advice, tips etc would be welcome!
A few notes:
I'm using OpenCV and numpy for other features in this code, not just for this snippet.
The main readon for ...
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C++ program that replaces given color in an image using OpenCV
I have created a C++ program that changes the color of a pixel to another color. But the main feature is that it not only changes 100% accurate colors; instead it matches two colors by using a method ...
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Can I better architect this image detection bot?
I'm trying to learn python by building an image detection bot for a 2d game.
The bot checks to see if it can find any one of a number of images within a cropped section of the game window. If it finds ...
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Face tracking with recognition and age/gender detection
This program loads a video, detects and tracks faces in the video and detects the estimated age and gender of each person. The objective is to collect data on the number of unique people in a video ...
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Segment characters from license plate image according to regions with same height
I have (for example) the following license plate image:
And I want to segment the characters. The code I have so far consists of me using cv2.MSER to detect ...
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Multi-core OpenCV denoising
I have ~40,000 JPEG images from the Kaggle melanoma classification competition. I created the following functions to denoise the images:
...
CommunityBot
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Rotating an Image using own algorithm in python
For an uni assignment I have been giving the task of making my own rotating algorithm in python. This is my code so far.
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Batch extracting differences between two images with enhancement using opencv
I am attempting to extract the absolute differences image between two input images and then enhance the intensity (brightness) channel in HSV color space with the given times. The workflow is like ...
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Update image pixels based on different criteria
Problem statement: Assume a high resolution (> 3000 x 3000) image is given as input. The image pixels can be classified into one of the three categories namely text, background and drawing. There ...
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Rainbow Trails Video Effect
This is an effect to augment juggling videos:
The goal of this effect is to add a rainbow trail to a video using a tracked set of points.
Link to source video
Link to source data
Link to complete ...
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1
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Reinventing BGR to Grayscale OpenCV convert function in Python
For academic purposes I want to reinvent Blue Green Red to Grayscale function in Python. I am new to Python so I believe my code below can still be optimized.
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1
answer
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Image (Const) Iterator using C++17
I am trying to learn how to correctly implement an iterator (and its corresponding const variant) using a single template, so I would appreciate any criticism to the following code. It's an forward ...
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OpenCv webcam streaming class for WPF
My goal is to make a class that wraps the complexity of OpenCvSharp implementation to show a webcam streaming into a WPF Image. ...
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vote
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answer
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Watermarking an image
I have a small bit of code and I wonder if I can make it more readable. I would appreciate it if some people could take a look at it and give me some feedback. I especially wonder if there is a beter ...
Mast♦
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Python - Get Unique frames of video containing object
I am analyzing videos from the popular social media platform, TikTok, and extracting the songs into a Spotify playlist. Here is a gif of one of these videos: https://i.imgur.com/I0dVoac.mp4. Full ...
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Parallel image segmentation [closed]
Follow up question Image processing using Python OOP library
I want to use multiprocessing to analyze several images in parallel:
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Selecting child contours in OpenCV
I'm really new to OpenCV. :) I have been working on this for almost an entire day. After hours of sleepless work I would like to know if I can further improve my code.
I have written some code to ...
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answer
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Trimming blank space from images
I am working on scanned documents (ID card, Driver licenses, ...). The problem I faced while I apply some preprocessing on them is that the documents occupy just a small area of the image, all the ...
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2
answers
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Analyzing the darkest pixels of an image in Python
This script takes an image copied from the clipboard and analyzes the n darkest pixels of the image. It will loop through each found value, prints out the value information and the quantity, then ...
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Made a sudoku solver with basic GUI in C++
I've made a sudoku solver which solves a sudoku, given user input, and can also extract digits from a picture of a sudoku to solve it. I've used OpenCV and GTK+ 2.0 to achieve the above. I am very ...
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Image color-moment extractor [closed]
I was just wondering if there is a way to speed up the performances of this for loops in Python.
I'm trying to process an image to get the color-moments without using libraries.
It takes about 12sec ...
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Conway game of life implemented with C++/OpenCV
Here is an implementation of Conway's Game of Life. It is kind of a brute force but it works fine. I have a special question about the method cv::Mat render() const,...
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Tensorflow Python ML to Detect Emotion [closed]
I've created an application to predict emotions. But I think the application is being over fitted. And I cannot figure out how to solve the overfitting. I'm using a small data set of 107 images spread ...
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1
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Dealing with lot of images and multiplications
With some basic knowledge of Python and referring a lot of sources, I have written the code below. But it takes half an hour for execution. How can I reduce the time? I read about vectorization but ...
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PPE object detection with tensorflow and opencv with rtsp streams
I am working on an object detection API implemented in Tensorflow 1.14 and OpenCV 4.1, where my task is to recognize personal protection equipment (PPE) worn by workers at various construction site ...
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Print numbers from video frames to console using pytesseract
This is my first ever Python program. It checks every frame of a video file with Tesseract then uses OCR to recognise numbers in that frame and prints it to the console.
...
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Find product defects in a photograph
I have been trying to find defects (brown/copper parts) on this sample using PyQt, OpenCV and Python:
And I can find defects, too. My problem is, I have nobody to ask, get feedback etc. I need some ...
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OpenCV motion detection and tracking
I've been tinkering with Python and OpenCV for a while now, and thought I'd start an actual project. This is my first time making something that I'd actually consider using, and my first time posting ...
CommunityBot
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Image edge detection
I have a Canny Edge Detection Code written in C++. I would like to know how can I make it more robust in terms of detecting all the edges correctly and save it? Is this the best possible edge ...
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PyOpencv code that displays color, b/w and canny images input from single live webcam camera
I have e single live webcam camera. I have displayed one color image, black and white image and canny edge image. Do you think I should put a scrollbar for the canny edge detection amount to make it a ...
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Display image from live webcam as taken, with four different color filters and in B/W
I have a live webcam windows which means there are six subdivided windows in a single window live. And show pictures in colored and black and white. Is there anyway I can make the code ...
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Merging rectangles in C++ [closed]
I have the following code for separating out overlapping rectangles vs.
non-overlapping rectangles in C++ 11:
...
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0
answers
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Python video streaming server and client
Worked with same IP cameras for some time, and noticed that camera use much processing power because of multiple connections. Writing streaming server looked as nice solution so I decided to write my ...
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answers
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OpenCV calculate center of mass for a single contour
I was recently going through some OpenCV code that finds the center of mass in a contour and realized there is potential room for optimisation.
What I noticed looking back through my code is when I ...
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