Classic image-processing algorithms, written in C++ in 2019, running in your browser.

▶  Open the live museum

C / C++  ·  CImg  ·  Emscripten  ·  WebAssembly  ·  vanilla JS

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Pick a public-domain photograph and run classic image-processing algorithms on it: brightness and contrast, median and harmonic filters, edge and line detection, histogram equalisation, morphology, and the Fourier domain. The result appears straight away. The algorithms are the original C++ I wrote in 2019 for the Computer Vision course of my Information Technology bachelor's degree, compiled to WebAssembly and run unchanged. No image is uploaded; everything happens on your machine.

Examples

Every result below is produced by the actual compiled C++, applied to Ansel Adams's The Tetons and the Snake River (1942).

Original the source photograph	Negative invert every pixel, g = 255 − f	Roberts edges 2×2 diagonal gradient (1963)
Rayleigh equalise redistribute tones to reveal detail	Median filter denoise, keep edges sharp	FFT spectrum log-magnitude Fourier transform

How it works

Each operation is the original C++ program, compiled to WebAssembly and run unchanged, driven exactly as it would be from a terminal:

canvas pixels  ->  encode 24-bit BMP  ->  write /input.bmp into Emscripten's in-memory filesystem
               ->  Module.callMain(['--orobertsi', '/input.bmp'])   (the program's real main)
               ->  read /newOne.bmp  ->  decode BMP  ->  draw to canvas

-Dcimg_display=0 turns CImg's desktop-window calls into no-ops, so the original GUI code runs harmlessly and image.save() still writes the result. The algorithm source is byte-for-byte unchanged. See WEB-MUSEUM.md for the details and the full list of operations.

Repository

Path	What
Task1–Task4/	the original C++/CImg programs (unchanged algorithm source)
docs/	the website (HTML/CSS/JS and the compiled wasm/), served by GitHub Pages
build/build.sh	compiles the four programs to WebAssembly
WEB-MUSEUM.md	what changed for the browser port, exhibited vs. omitted operations

Build the WebAssembly

source ~/emsdk/emsdk_env.sh      # Emscripten SDK
bash build/build.sh              # writes docs/wasm/Task{1..4}.{js,wasm}

Credits

Algorithms by Szymon Ruciński (2019). The gallery is public-domain photography from NASA, the Farm Security Administration / Office of War Information, the U.S. National Archives (Ansel Adams's National Park Service series), and the 1873 Wheeler Survey, sourced via the Library of Congress, the National Archives and Wikimedia Commons.