Android example of document scanning with OpenCV featuring edge detection, perspective correction, and image enhancement. Demonstrates implementation of camera preview, image processing, and OCR integration for document scanner applications.

Take any phone-taken picture and turn it into a document scan.

Automatically extract documents from images and perspectively correct them with classic computer-vision algorithms. In maintenance mode. Check out its successor at:

Android application for correcting perspective in photos.

Pytorch implementation for Perspective Plane Program Induction from a Single Image (P3I).

This is a projective geometry project aiming to correct perspective distortions in images after a user identifies pairs of horizontal and vertical lines.

iOS app that scans a photo and saves it with a custom timestamp and location data

PixSoR - Pixel Software Renderer with Shader Emulation.

Automatic photo rectification

Zero-tap document rectification for Android — automatic boundary detection, perspective correction, and clean rectangular output using classical CV with planned ML enhancement

一个专为太阳能电池板等阵列结构设计的智能分割标注工具，支持均匀分割和基于波形分析的智能分割。A semi-automatic annotation tool for regular array structures such as photovoltaic panels, featuring uniform splitting and waveform-based smart segmentation.

Image processing application built with C# for correcting perspectives in industrial or desktop environments.

Simple software rendering

A modern, web-based tool to fix skewed or distorted image perspectives using Bezier control points. Built with Next.js and fully browser-based.

Perspective correction and image alignment tool for OCR/AI preprocessing. Straighten skewed documents. Pure HTML/JS.

An OpenCV project that automatically detects a document in an image and finds its corners for perspective correction. This notebook demonstrates a practical computer vision pipeline using morphological operations, Canny edge detection, and contour analysis to prepare for a "bird's-eye view" transformation.

│ 📄 Free, open-source document scanner for Android — capture, auto-detect edges, crop, apply filters, OCR text extraction, and export as PDF/JPEG. Built with Kotlin, CameraX, OpenCV, and ML Kit.

Software rasterizer written in C++

VisionMetrix is a computer vision platform that measures real-world objects using a standard A4 sheet as a reference plane. It converts pixel distances into millimeters through perspective correction, homography transforms, sub-pixel corner refinement, and rotation-invariant dimensioning for accurate planar measurement.