This tutorial walks through downloading a dance video, extracting frames, using Baidu AI for person segmentation, generating word‑cloud masks, and stitching the results into a dancing word‑cloud video with Python, OpenCV and the WordCloud library.
This tutorial shows how to use Python, OpenCV, and Pillow to capture, process, and animate Wuhan University’s cherry blossom scenes, turning pixel data into a time‑lapse video with custom text overlays and frame‑by‑frame control.
This tutorial explains how to build a high‑performance Minesweeper bot in Python by capturing the game window, segmenting the board into 16×16 pixel cells, recognizing each cell’s state via OpenCV color analysis, and applying a simple logical algorithm to flag mines and click safe squares.
Learn step‑by‑step how to compress a 1 MB image down to under 100 KB using Java’s ImageIO API and OpenCV, covering the theory of image compression, code snippets for reading, configuring compression parameters, and performance comparisons between native JDK and OpenCV solutions.
Learn how to create a Python-based screen recording tool on Windows 10 using Pillow for screenshots, OpenCV for video encoding, NumPy for frame processing, and pynput for hotkey control, with step-by-step code examples, optimal FPS calculation, and MP4 saving techniques.
This tutorial walks through a complete Python workflow that downloads a B‑site video, extracts frames with OpenCV, uses Baidu AI for human segmentation, crawls danmu comments, creates a masked word‑cloud animation, and finally merges the clips with audio into a polished video.
This tutorial shows how to use Python, ADB, and OpenCV to automate the mobile game Princess Connect, covering environment setup, device communication, screen capture, image matching, OCR, and script snippets for clicking, typing, and switching accounts.
OpenCV 4.5.5 introduces audio support in VideoCapture, updates SOVERSION handling, adds OpenVINO 2021.4.2 LTS compatibility, expands ONNX test coverage, upgrades protobuf, optimizes for RISC‑V, and enhances the G‑API module with numerous vectorized kernels, SIMD scheduling, and various bug fixes.
This article details a step‑by‑step implementation of visual servoing for a TurtleBot3 using a fisheye camera, ROS Melodic, OpenCV ArUco markers, camera calibration, A‑star path planning, and ROS publishers to move, avoid obstacles, and park precisely at a target pose.
This open‑source project implements a Spring Boot and Maven based license‑plate detection and training system in Java, leveraging OpenCV and JavaCPP, supporting multiple plate colors, SVM and ANN algorithms, and providing a B/S architecture with SQLite, Swagger documentation, and extensible image‑recognition features.
This article explains a complete Python workflow for solving image‑click captchas by retrieving the base64 image, binarizing it, detecting character contours, generating candidate character images, matching them, and finally returning the click coordinates needed for verification.
This tutorial explains how to use Dlib and OpenCV in Python to capture face images, extract 128‑dimensional descriptors, store average features in CSV files, and perform real‑time face recognition by comparing Euclidean distances against a known dataset.
This tutorial shows how to embed hidden text into an image using Python's OpenCV and PIL libraries, detailing the step‑by‑step process, complete code, customization tips, and visual results, enabling messages that appear only when the picture is enlarged.
This guide shows how to use Python’s Haishoku library together with PIL or OpenCV to extract dominant colors and full palettes from any image, then apply the results to improve data‑visualization aesthetics.
This guide explains how to install Python and OpenCV, write a script that captures a webcam image and emails it using SMTP, and then package the script into a standalone executable with PyInstaller, including all required commands and code snippets.
This tutorial demonstrates how to use Python's OpenCV and Pillow libraries to read a photo, create a white canvas, and embed hidden text into image blocks so that the message is invisible at normal view but appears when zoomed in, with adjustable font and spacing parameters.
This tutorial explains how to collect captcha images, preprocess them with OpenCV—including grayscale conversion, median blur, binarization, contour detection, and character segmentation—and provides core Python code and visual results for building a reliable Python web‑scraping pipeline.
This article walks through the complete workflow of creating a robust image CAPTCHA labeling and recognition solution—from background concepts and motivation, through data collection, annotation, CNN model training, and deployment—highlighting practical lessons and code resources for Python and OpenCV.
Learn what QR codes are, how to install the Python qrcode library, create simple and advanced QR codes with customizable parameters, and decode them using OpenCV, all with clear code examples and practical tips for safe usage.
This guide explains how to prepare Haar and LBP data, use OpenCV's CascadeClassifier and detectMultiScale functions, and run a complete Python script that captures video, detects faces, draws bounding boxes, displays results, and saves detected frames.
This article introduces the fundamentals of face detection using Python's OpenCV library, explaining the underlying concepts of computer vision and providing a complete, step‑by‑step script that loads an image, converts it to grayscale, detects faces with a Haar cascade, and visualizes the results.
This article guides readers through downloading Haar cascade files for face detection using OpenCV, including code examples and step-by-step instructions.
This tutorial explains the history and common uses of QR codes, shows how to install the Python qrcode library, demonstrates simple and advanced QR code generation with customizable parameters, and teaches how to decode QR codes using OpenCV, complete with code examples.
This article introduces the most widely used Python image‑processing libraries—including scikit‑image, NumPy, SciPy, Pillow, OpenCV‑Python, SimpleCV, Mahotas, SimpleITK, pgmagick, and Pycairo—explaining their key features and providing concise code snippets that demonstrate filtering, segmentation, enhancement, and computer‑vision tasks.
This tutorial demonstrates how to use OpenCV in Python to read an image and draw basic shapes such as rectangles and circles by specifying coordinates, dimensions, colors, and line thickness, then display the edited image in a window.
This article demonstrates how to use Python's OpenCV library to read an image, display its original dimensions, resize it to a specified size, save the resized image, and handle user input to close the display windows.
This article explains the three commonly used color spaces in computer vision—grayscale, BGR, and HSV—detailing their characteristics and typical applications, and provides a Python OpenCV code example that converts an image to grayscale and displays both the original and processed images.
This tutorial explains the concept of facial recognition, describes how it works, and provides step‑by‑step instructions and code examples for implementing face detection and identification using OpenCV and Python, including installation, basic image handling, and a complete sample script.
This tutorial walks through downloading a Bilibili dance video, extracting GIF frames, converting each frame to ASCII art, renaming and ordering the frames, converting them to images, and finally assembling them into a video with background music using Python libraries such as you-get, OpenCV, Pillow, and moviepy.
This article introduces a Python 3.6‑based attendance system that combines PyQt5 for the GUI, OpenCV and DeepFace for real‑time face recognition with liveness detection, and MySQL for storing student and class data, detailing its design, database setup, features, and step‑by‑step usage instructions.
This article demonstrates how to use Python's OpenCV and Pyzbar libraries to capture video from a webcam, decode barcodes in real time, display the results, and save captured frames, providing a practical guide for implementing barcode recognition in a retail checkout scenario.
Discover ten essential, free Python libraries for image processing—from scikit-image and NumPy to OpenCV-Python and Pycairo—each with resources, usage examples, and visual demonstrations, enabling you to manipulate, analyze, and transform images efficiently for computer vision and data science projects.
This tutorial walks through a project‑based OpenCV workflow that reads a digit template, preprocesses both template and credit‑card images, extracts individual numbers, matches them against the template, and finally overlays the recognized digits onto the original image, illustrating core computer‑vision techniques.
This article describes a Java-based ID card number recognition project that integrates Tess4j with JavaCPP to leverage OpenCV functionality without requiring a separate OpenCV installation, outlines required software, troubleshooting steps, recent updates, and provides the project repository link.
This tutorial demonstrates how to import, resize, threshold, rotate, and blend foreground photos with a panda‑head background using OpenCV and Pillow in Python, then add English or Chinese text and save the resulting meme image.
This tutorial walks you through building a cute panda‑head meme by importing, resizing, binarizing, rotating, and compositing foreground photos onto a background image using OpenCV and Pillow, then adding English or Chinese text and saving the final emoji.
TextShot, a newly released open‑source Python utility by GitHub user ianzhao05, lets you capture any screen region and instantly convert the image to editable text using Tesseract OCR, with multilingual support, hotkey integration, and step‑by‑step installation guidance for Windows and Linux.
This tutorial demonstrates how to create a Python GUI image viewer and a simple computer‑vision application using PySimpleGUI, os, and OpenCV, covering layout design, element configuration, event handling, and camera integration with clear code examples and explanations.
This article introduces a Java OCR project for ID cards that integrates OpenCV, JavaCPP, and Tess4J to perform image preprocessing, region cropping, and character recognition without requiring OpenCV installation, and details its features, encountered issues, system requirements, updates, and source repository.
This article introduces a Java-based ID card number recognition project that integrates OpenCV, Tess4J, and JavaCPP to perform OCR without prior training, outlines the encountered library linking issue, lists required software, and details recent updates such as chunked uploads and OpenCV version upgrade.
This article presents a practical solution for eliminating POI label overlap on maps by applying 2D collision‑detection techniques and the A‑Star path‑finding algorithm to intelligently position labels and draw connector lines, complete with Python and OpenCV code examples.
An open-source Java Spring Boot project demonstrates license plate detection and recognition using OpenCV, supporting multiple plate colors, with SVM and ANN training, detailed architecture, feature list, installation guide, and visual processing steps, offering a beginner-friendly tutorial for image recognition enthusiasts.
This article introduces an open‑source Java Spring Boot project that implements a license‑plate detection and recognition system with training capabilities, detailing its features, architecture, supported plate types, software requirements, processing steps, installation guide, and reference resources.
This article explains the principles and implementation of face detection based on statistical methods, detailing Haar feature types, integral image computation, feature normalization, cascade classifiers, and provides step‑by‑step OpenCV code examples for static images, eye detection, and real‑time webcam detection.
This tutorial walks through building a Python program that uses OpenCV to reduce colors and enhance edges for cartoon‑style conversion, then wraps the process in a simple Flask web app for uploading images and displaying the resulting cartoons.
This tutorial shows why learning Python is valuable and walks you through four fun projects—drawing Peppa Pig with the turtle library, changing image backgrounds using OpenCV, splitting images into a 3×3 grid with Pillow, and creating dynamic QR codes with MyQR—complete with code examples and visual results.
This tutorial demonstrates how to use Python's OpenCV library to read and display images, perform resizing, convert to HSV, apply binary thresholding, execute erosion and dilation, and replace specific pixel colors, providing step-by-step code examples and visual results for each operation.
This tutorial explains how to use Python, Appium, and OpenCV to automatically perform WeChat’s “punch” (拍一拍) action by locating a friend’s avatar via image recognition and simulating a double‑tap, all within roughly 30 lines of code.
This tutorial demonstrates how to use Python, OpenCV, and NumPy on Windows to import an image, resize it, convert it to HSV, apply color-based masking, perform erosion and dilation, replace the background color, and finally save the processed photo with a single script.
TextShot is a Python-based OCR utility that captures a screen region and instantly converts the image into editable text, leveraging Tesseract and optional language parameters, with installation steps, hotkey integration, and guidance on image preprocessing for improved accuracy.
This article explains traditional image augmentation techniques focusing on geometric transformations such as translation and rotation, describes forward and backward mapping concepts, coordinate‑system conversion, matrix representations, and provides detailed C++ OpenCV examples for implementing these operations with warpAffine and getRotationMatrix2D.
This tutorial shows how to turn a loved one's photo into a heart‑shaped mosaic made of the phrase “I love you” using Python, OpenCV, and PIL by extracting pixel colors and drawing colored text onto a new image.
A Wuhan University student turned the phrase “武汉加油” into thousands of colored pixels using Python, creating a time‑lapse cherry blossom animation that celebrates spring and supports the city, with step‑by‑step code for image generation, video assembly, and pixel‑level color handling.
The article details how a low‑cost, compact face‑recognition lock for an escape‑room game was built using a Raspberry Pi, camera, ultrasonic sensor, relay‑controlled electromagnetic lock, and Tencent Cloud’s Face Recognition API, with about 200 lines of Python code handling parallel sensor monitoring, video streaming, watermark overlay, and cloud authentication.
This tutorial explains how to detect, calculate, and correct the rotation angle of text in an image using OpenCV, covering image binarization, minimum‑area bounding box extraction, angle adjustment, and affine transformation with clear Python code examples.
This article introduces a complete vehicle license‑plate detection and recognition pipeline—covering image preprocessing, ROI extraction, character segmentation, SVM‑based classification, and a PyQt5 GUI—while also discussing code structure, demo results, and future improvements.
This tutorial demonstrates how to perform face swapping on static images using Python, dlib, and OpenCV, guiding readers through landmark detection, Procrustes alignment, color correction, and seamless blending to achieve realistic results.
This article demonstrates how compiling OpenCV 3.2 with CUDA 8.0 enables GPU‑accelerated template matching in Python, reducing average processing time from 0.299 seconds on CPU to 0.181 seconds on GPU—a 39.4% performance gain for automated testing image‑recognition APIs.
This article explains how to compile OpenCV‑Python with CUDA support to speed up image template matching, compares CPU and GPU execution times, and shows a practical Python example demonstrating a 39.4% performance improvement using OpenCV 3.2.0 and CUDA 8.0.
This guide explains how to build an Android automation script that uses ADB screenshots and OpenCV template matching to detect and repeatedly pull cards in a game, handling start, SSR/SR detection, and completion without manual interaction.
This article provides a concise introduction to image processing, covering its hierarchical structure, fundamental techniques such as classification, detection, segmentation, geometric transformation, and the most widely used libraries and deep‑learning frameworks for newcomers.
This article introduces core image processing concepts—pixel fundamentals, binary, grayscale, and RGB images, matrix representation—and demonstrates practical implementations of cropping, canvas creation, watermarking, translation, rotation, and scaling using Python's OpenCV and NumPy libraries, including algorithm choices for resizing.
This article compiles a series of entertaining Python code examples—including flag drawing with Turtle, image‑to‑ASCII conversion, Tetris, a plane shooter game, and a 25‑line face‑recognition script—to inspire learners and demonstrate practical programming techniques.
This tutorial walks through using OpenCV and a K‑Nearest Neighbors model to preprocess, segment, manually label, train, and finally recognize distorted, noisy CAPTCHA images, achieving about 82% accuracy on a test set of one hundred samples.
This article presents a step‑by‑step solution that combines computer‑vision preprocessing, OCR, CNN classification, shape matching, and inpainting to isolate meaningful foreground elements from images with intricate backgrounds, discussing practical results, limitations, and code implementations.
This article surveys the evolution of face recognition from early statistical methods to modern deep‑learning approaches, outlines key researchers, open‑source projects, popular APIs, core processing steps, the DeepFace architecture, datasets, and experimental results, providing a comprehensive guide for practitioners and researchers.
This article walks through creating a concise 200‑line Python script that automatically detects facial landmarks with dlib, aligns faces using Procrustes analysis, corrects color differences, and blends a second face onto a first image, complete with code snippets and step‑by‑step explanations.
This tutorial explains how to implement high‑accuracy face recognition using OpenCV, Python, and deep learning by leveraging dlib's deep metric learning, creating a custom dataset, encoding facial embeddings, and performing real‑time identification on images and video streams.
The article presents a complete iOS pipeline that trains an SSD‑MobileNet detector with TensorFlow, optimizes and converts it to TensorFlow Lite, runs C++ inference, applies non‑maximum suppression, and finally removes detected watermarks using OpenCV inpainting or pixel‑wise inversion, while discussing practical limitations.
This article walks through creating a real‑time card‑based augmented reality prototype using Python, OpenCV, and NumPy, covering surface detection, feature extraction, matching, homography estimation, and RANSAC to project 3D models onto a reference plane.
This article explains how to write a compact Python script (about 200 lines) that automatically detects facial landmarks with dlib, aligns two faces using Procrustes analysis, corrects color differences, and blends the second face onto the first using OpenCV, complete with full source code and visual examples.
This article explains how to use Python and OpenCV to automatically locate the player character and the next landing platform in the WeChat Jump game by applying template matching, Canny edge detection, image cropping, and pixel analysis to calculate the required press duration.
On the cusp of the 2017 year‑end, the author humorously marks the last 90‑post turning 18 while offering a Python‑OpenCV tutorial that, in just 30 lines of code, applies a beauty filter to make anyone look younger, complete with installation steps and sample output.
This article introduces how to leverage the opencv4nodejs Node.js module—binding OpenCV’s full API—to develop a face detection and recognition application, highlighting the CPU‑intensive nature of computer‑vision tasks, the limitations of JavaScript, and the availability of synchronous and asynchronous examples.
This guide walks you through extending a deep‑learning object detection project to process live video streams using OpenCV, Python, and the VideoStream class, covering environment setup, command‑line arguments, model loading, frame‑by‑frame detection, FPS measurement, and performance‑boosting tips.
This tutorial walks through using Python and OpenCV to capture screen images from GTA V, covering screen grabbing, converting to NumPy arrays, improving frame rates, handling key and controller input, and setting up a basic autonomous driving test environment, all without relying on pre‑existing libraries.
This article walks through a real‑world mobile implementation of a convolutional neural network for document detection, covering problem definition, limitations of traditional OpenCV pipelines, the adoption of a HED edge‑detection network, data preparation, model training, TensorFlow library trimming, and deployment tricks for iOS and Android.
This article showcases five engaging Python projects—including drawing a national flag with Turtle, converting images to ASCII art, building a Tetris clone, creating a simple plane‑shooter game, and implementing a 25‑line face‑detection script—complete with code snippets, installation tips, and visual results.
This article demonstrates how to build a lightweight facial‑recognition tool using Python and OpenCV, explains the underlying concepts such as cascade classifiers and image preprocessing, and provides a fully commented ten‑line script together with installation instructions and usage examples.
This article describes how the MMGame testing team combined the open‑source Appium automation framework with OpenCV's image‑recognition capabilities to enable coordinate‑based testing of third‑party mobile games that lack accessible UI elements, detailing the workflow, implementation, results, and a comparison with other mobile testing tools.
This tutorial shows how to use Python, OpenCV, and basic image‑processing techniques to automatically detect whether a kitchen oven is on by analyzing the red indicator light captured by a home camera, providing a simple safety alert system.
This tutorial walks through using PHP with OpenCV to detect faces, noses, and mouths, filter out false detections, and programmatically overlay a mustache image onto the identified region, complete with step‑by‑step algorithms, debugging tips, and visual results.
