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OpenCV Reviews

OpenCV (Open Source Computer Vision) is a library of programming functions for real time computer...

Social recommendations and mentions

We have tracked the following product recommendations or mentions on Reddit and HackerNews. They can help you see what people think about OpenCV and what they use it for.
  • Managing your Azure Cognitive Search Costs
    If you find this cost prohibitive, you could try using some compute resources outside of Azure and a library like OpenCV or Azure Form Recognizer to try to extract meaning from image documents and then store the extracted information in Azure Cognitive Search instead of the source document. This typically is not worth the effort, however. - Source: / 8 days ago
  • Real time images to Arduino Arrays conversion for use on LCD displays?
    To capture your eyes and make the determination of whether they are open or not (or to even copy the images to the LCD in realtime) will require a processor running much much faster than the average Arduino. Probably something making use of openCV (an extremely capable open source Computer Vision and image processing library). Arduino's (most) run at 16MHz. A Raspberry Pi or an ESP32 would be much more suited to... - Source: Reddit / about 2 months ago
  • Building a Deep learning model with Keras and ResNet-50
    You first import the OpenCV library. It will pre-process the selected flower image to ensure it has the same dimensions as the images that trained the deep learning model. - Source: / about 2 months ago
  • Does augmented reality websites work
    Hmm without the hardware support for AR-kit/Core, the camera has to do more of the heavy lifting. Not sure if there's a complete framework, but I know I heavily utilized for camera based tracking for AR back in 2017 (before AR-kit/core were released). - Source: Reddit / 3 months ago
  • Does there exist an API accessible from C# that detects faces in images?
    Alternatively, you can get into the nitty gritty of face detection yourself. OpenCV is a massive, open source project for all kinds computer vision tasks. Without jumping into the proprietary world, this is one of the most popular and capable computer vision libraries available. While powerful, OpenCV is comparatively low level; giving you the tools you need to accomplish your task, rather than a direct, single... - Source: Reddit / 3 months ago
  • Camera array system for photogrammetry?
    OpenCV can do this for you, in fact it's probably better for the money and effort than solving your photogrammetry problem with hardware. I use it to create 3D images with two side-by-side GoPros. What you're looking for is the camera calibration process. - Source: Reddit / 3 months ago
  • What is the smallest computer chip you can run a python program on?
    Many people use a Raspberry Pi single board computer (£10 - £50) and a cheap camera module as a security system. For example, I have one that uses OpenCV to tell me if someone or a vehicle I don't know is visiting (and different alerts for people or vehicles it recognises). - Source: Reddit / 3 months ago
  • Truck caught up to me, quickly tail-gaited me, then passed and REVERSE HIGH-BEAMED. 🤣
    Yeah you can overlay images with geometric transformations to make them flat using software like OpenCV (, then upsample, but based on the video it would be unlikely that the frames have enough resolution to do so. - Source: Reddit / 4 months ago
  • I’m not sure how to improve myself further
    By the way, my problem was much easier because it was on a track my car essentially had lanes to stay in. Yes, I stuck an iphone on thecar, and used the iphones camera to center the runner's face in the center of the screen using a library called OpenCV. I also used a rangefinder to determine distance from the car, and then you can basically triangulate with dynamics where the car needs to turn. There wasn't... - Source: Reddit / 4 months ago
  • Hello friends. My 6th grader son is working on his science fair project, the teacher is getting married and she is not going to school for the next couple of weeks.
    You should be able to do this with opencv. - Source: Reddit / 4 months ago
  • App that measures consumption/cost of Analog Electric Meter
    If you need the precise values shown on the meter then you'll need to rig up a camera. You'll also need to space it far enough away that it can focus on the meter + have sufficient illumination. Take stills and then feed it into OpenCV. Something like - Source: Reddit / 6 months ago
  • How To Make Vtuber Softwares?
    In terms of software, what you linked used optical tracking. The underlying tech is commonly called machine/computer vision. You can develop your own tracking software, but there's some open source solutions, like OpenCV than make it faster to build apps. (You can use OpenCV with Python bindings to learn the basics somewhat quickly). What you linked uses Kalidokit, an open source solution using TensorFlow.js and... - Source: Reddit / 6 months ago
  • Which library/framework are standards for image processing?
    OpenCV ( was pretty standard last I was doing image processing in c/c++. - Source: Reddit / 6 months ago
  • The Video Data Issue
    Basically, take two (or more) high performance cameras spaced some known distance apart (distance depends on how far you expect the object to track will be from the cameras) and film the same object in the sky. If the optical parameters, location, and orientation of both cameras are known, you can use algorithms from image processing libraries (i.e. OpenCV) to determine the tracked object's location, speed, and size. - Source: Reddit / 6 months ago
  • Control User Access and Permissions in CVAT with Open Policy Agent
    The post examines the implementation of Identity and Access Management (IAM) in the Computer Vision Annotation Tool (CVAT), which is a part of the OpenCV ecosystem. CVAT helps to annotate raw images and video files to produce a ready-to-use Computer Vision dataset in popular formats such as MS COCO, PASCAL VOC, YOLO, etc. Here we will cover:. - Source: Reddit / 6 months ago
  • Can i learn cv as a 14 year old with no experience in higher level math?
    Try out OpenCV and Kaggle for basics on image manipulation and data science: and - Source: Reddit / 7 months ago
  • Finding the coordinates of numbers in an image
    I think you should just use its dependency OpenCV directly. I would also start with this Sudoku solver that uses OpenCV: - Source: Reddit / 7 months ago
  • Counting cars in video
    This could be done with OpenCV. Actually, someone already made something like that. - Source: Reddit / 9 months ago
  • Diablo Immortal might be able to Track our Faces
    So... I downloaded the client tonight and out of curiosity I browsed the installation folder. There I found out a lot of files that enable recognition through computer vision. Namely, there is a full OpenCV implementation as well as a few files that refer to Face Detection and Face Analysis. - Source: Reddit / 10 months ago
  • stereodemo: compare several recent stereo depth estimation methods in the wild
    OpenCV stereo block matching and semi-global block matching baselines, with all their parameters. - Source: Reddit / 10 months ago
  • Processing images in Java with OpenCV and Quarkus
    If you are into Computer vision, you probably are familiar with OpenCV. Its an amazing library that has almost everything one needs to do 2D and 3D processing and much more. Gesture recognition, face detection, Motion tracking, think of anything related to image processing and OpenCV can be your goto. Its based on the BSD license, so you can just download it and start using it. - Source: / 11 months ago

External sources with reviews and comparisons of OpenCV

Top 8 Image-Processing Python Libraries Used in Machine Learning
These are some of the most basic operations that can be performed with the OpenCV on an image. Apart from this, OpenCV can perform operations such as Image Segmentation, Face Detection, Object Detection, 3-D reconstruction, feature extraction as well.
5 Ultimate Python Libraries for Image Processing
Pillow is an image processing library for Python derived from the PIL or the Python Imaging Library. Although it is not as powerful and fast as openCV it can be used for simple image manipulation works like cropping, resizing, rotating and greyscaling the image. Another benefit is that it can be used without NumPy and Matplotlib.
Top Python Libraries For Image Processing In 2021
To build computer vision and machine learning models, OpenCV has more than 2500+ algorithms. These algorithms are very much useful to perform various tasks such as face recognition, object detection, and many more. Let’s see some examples where we can perform using OpenCV:

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