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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9 views

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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1answer
39 views

Parallel image segmentation

Follow up question Image processing using Python OOP library I want to use multiprocessing to analyze several images in parallel: ...
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2answers
43 views

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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1answer
119 views

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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1answer
62 views

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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1answer
69 views

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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1answer
30 views

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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0answers
56 views

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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67 views

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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64 views

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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1answer
252 views

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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24 views

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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1answer
108 views

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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2answers
250 views

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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55 views

Merging rectangles

I am looking at some code that merges boxes: ...
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2answers
866 views

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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2answers
193 views

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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0answers
62 views

Merging two, three or four images

This code is about merging two or more images. Minimum images are two while maximum images loaded are four. So I will check how many images the user wants to merge. If the user chooses 2 and selects ...
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1answer
87 views

Create a structuringselement in the form of a line with a certain degree and length

Within Matlab there exist a function to create a structuringselement in the form of a line. SE = strel('line',len,deg) creates a linear structuring element that is ...
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1answer
70 views

Image tracking code using opencv in python

I wrote this code to track small moving objects falling down a chute. The code works buts runs too slowly: using 60 FPS 1920 by 1080 footage the code only runs at about 10 FPS. The problem there is ...
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1answer
101 views

Add watermark to images

Recently, I started reading image processing via opencv library in python. I create a minio object storage and upload some photos into it. After that, I wrote a program which reads every image in ...
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1answer
136 views

Image Processing - Comparing 2 images and Ranking Similarity

My code compares 2 images of any shape/dimension and ranks them in order of similarity. It starts with reading from a CSV file with columns image1, image2 which contain absolute paths and then ...
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0answers
41 views

Interfaces and OOP Design for Image Editor software

I'm new to C++ programming, and I'm building an Image Editor software like Lightroom/CameraRaw from scratch. Apart from procedural code (actually seems that all the functions works correctly) my goal ...
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0answers
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Create mosaic task #2

This post is a continuation of post here: Create mosaic task. I improved code readability, hopefully it'll be reviewable now. Once again, I'm asking for tips to write better code. Task: The point ...
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1answer
50 views

Whiten black contours around a skewed image

I have this image: I want to whiten the black contours (borders) around it without affecting the image content. Here is the code I used: ...
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0answers
116 views

Plant pest detection using CNN

I am doing a project in plant pest detection using CNN. There are four classes each having about 1400 images. While training the model using Convolution Neural Network, there is a smooth curve for ...
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2answers
445 views

Captcha Letter Extraction

We are developing an automatic text Captcha solver in python 3. The solver has a module that is responsible for extracting letters out of captcha images that contain 4 letters each. We would like to ...
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1answer
4k views

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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1answer
789 views

Image pre-processing and segmentation

I'm new learning python and image processing with python. For this reason, I took a project called "Classification of breast cancer images with deep learning". I applied the following techniques: 1)...
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Image capture client - multi-threading + sharing data between services

I'm working on a small side project at the moment - like a homemade CCTV system. This part is my Python Capture Client - it uses OpenCV to capture frames from a connected webcam and sends the frames ...
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1answer
106 views

Optimizing gradient function in C++

I'm computing the gradient of an image manually (without using built in functions) and I want to make it faster but keeping the same performance. I'm very open to any suggestions.. currently learning ...
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1answer
1k views

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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2answers
1k views

Passing bitmap from C# to C++ via a struct

First, I've read the a few questions regarding this issue, the most helpful being: https://stackoverflow.com/questions/27463876/passing-bitmap-from-c-sharp-to-c I was unable to get the provided ...
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1answer
156 views
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2answers
201 views

Testing Video Frames for Uniqueness

I'm working on a program that will (hopefully) eventually allow me to perform frame rate analysis like Digital Foundry does. The code below works (as far as I know), but before I iterate on it, I'd ...
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0answers
1k views

Real time object Detection and tracking

I am using OpenCV 3.3 to implement a project. My project allows to detect pedestrian and car using background subtraction from video sequence which get from camera. First, I detect the object region ...
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1answer
468 views

Image processing using Python OOP library

I am trying to learn OOP by refactoring my existing code (functions only). This example works but I am not sure whether it is pythonic and good practice. I have a shared library which consist of ...
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84 views

Data set generation with Python and Matplotlib

I want to use Python and Matplotlib to create a data set of images. I want to do this by transforming the plot to a numpy matrix. At the moment it takes about 0.1 second to generate 100 images of size ...
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1answer
588 views

Parallelized Sobel algorithm using OpenMP

I implemented the Sobel algorithm sequentially, and got decent performance (1.49 s) but wanted to improve it. I parallelized it with OpenMP and got a ~3x speedup (0.523 s). I'd like to do better, but ...
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1answer
370 views

Efficiently selecting spatially distributed weighted points

Background: Motivation behind writing the following code is originated in the area of computer vision. More specifically – image rectification. In order to obtain rectified images, one has to find a ...
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1answer
532 views

Multithread resource producer and consumer algorithm

I have made a little example of a code that stores frames of a camera in a buffer that runs in a separate thread and another thread can consume it. Is this model efficient? ...
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1answer
14k views

Looping over pixels in an image

I have the following code which iterates over all pixels of an image and does some manipulations on two images of the same size. I would like to speed it up and to avoid iterating over the positions ...
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1answer
1k views

Converting MP3 albums into MP4 videos for YouTube

This is a quick script that helps me to convert MP3 files from my CDs into videos I can upload on YouTube. It is intended for personal use, so no input error checks. I am creating a silent video using ...
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0answers
681 views

OpenCV multi-colored object tracking

These two classes are part of a larger program that I am developing. The user is supposed to interact with the program using handheld red, blue, green or yellow discs and moving them in front of a ...
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2answers
771 views

Image processing parallelization

I'm working in a big project so I decided to take just part of it which you can copy/paste and compile in your machine. You might get weird image at the end but that's fine, that's what I want. I'm ...
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1answer
62 views

Set of matrix operations for summing around a matrix element

I have a results of simulations, which are discrete complex numbers representing wave function on a NxN grid. I calculate phase of the wavefunction. For every point on that grid I have to perform this ...
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4answers
12k views

Processing an image to extract green-screen mask

I am using OpenCV to process an image, and in my code, I have to check / edit each pixel separately: ...
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0answers
64 views

Improving SVM fitting accuracy

I have this attempt on classifying CIFAR10 images. I'm curently training my SVM only on 1 of 5 sets, and decided on using polynomial kernel(degree=3,C=0.1 [changes have no effect],gamma=2 [changes ...
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1k views

Opencv forEach with lambda expression for parallel processing

I'm using forEach function to access pixels in parallel like so: ...
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0answers
139 views

Performing FFTW double[2] on images of type cv::Mat

I've two different types of variables: cv::Mat and array of type double[2] so I do quite lot of copying between the two types. I ...