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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Is there a way to speed up a nested for loop in Python?

I was just wondering if ther's 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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34 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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28 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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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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247 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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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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237 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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54 views

Merging rectangles

I am looking at some code that merges boxes: ...
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2answers
854 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
168 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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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
78 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
68 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
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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
126 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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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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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
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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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114 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
401 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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Extracting face features from selfies faster

My code takes two .jpg files (two selfies) and extracts a vector of 128 features from each selfie. After this extraction we take these two vectors and get their cosine distance. I timed the script ...
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1answer
757 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
105 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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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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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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199 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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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
433 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
569 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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367 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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518 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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679 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
757 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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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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63 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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Opencv forEach with lambda expression for parallel processing

I'm using forEach function to access pixels in parallel like so: ...
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137 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 ...
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282 views

OpenCV numpy image tranformation efficiency [closed]

I am doing a few image transformations - resize, offset, and crop. I am doing all these operations separately, but I feel like they can be better combined to get a speed improvement. This is happening ...
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757 views

Optimize GPU usage for real-time object detection from camera with TensorFlow GPU and OpenCV

Trying to recognize objects real time using TensorFlow Object Detection API OpenCV using ssd_mobilenet_v1_coco_11_06_2017 model in GPU. ...
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1answer
8k views

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 ...