@webarkit/purecv-wasm

This is the official WebAssembly binding for PureCV, providing high-performance, pure-Rust image processing and computer vision functions directly in the browser and Node.js.

Dual-Build Architecture

This package comes heavily optimized out of the box with a dual-build strategy:

• Standard (dist-std): Provides maximum browser compatibility.
• SIMD (dist-simd): Delivers massive performance boosts in environments that support WebAssembly simd128 (most modern browsers).

You can load either module depending on your runtime capabilities.

Installation

npm install @webarkit/purecv-wasm

Usage Example

// Example using a bundler (webpack, vite) or in Node.js
import init, { Mat, gaussian_blur, CV_8UC3, BORDER_DEFAULT } from '@webarkit/purecv-wasm/dist-std/purecv_wasm.js';

async function run() {
    // Initialize WebAssembly
    await init();

    // Mat.new(rows, cols, mat_type)
    const mat = Mat.new(480, 640, CV_8UC3);
    
    // Process your image data here...
    // For example, uploading an ImageData array buffer to `mat`

    // gaussian_blur(src, ksize_w, ksize_h, sigma_x, sigma_y, border_type)
    const blurredMat = gaussian_blur(mat, 5, 5, 0.0, 0.0, BORDER_DEFAULT);

    // Free memory manually!
    mat.free();
    blurredMat.free();
}

run();

For a concrete, runnable example directly in an HTML file using fetch, check out the www/ demo directory in our GitHub repository!

Memory Management

Because WebAssembly runs linearly in memory and holds pointers to Rust Vec objects, memory allocated for matrices such as Mat are not automatically garbage collected by JavaScript. When you are done manipulating your matrix, you must ensure you call .free() to prevent memory leaks in the browser.

API coverage

Right now we have covered a large majority of operations for core and imgproc, and have started on calib3d and video:

• Core: Arithmetic (add, subtract, multiply, absdiff etc.), Structural (hconcat, vconcat, flip), Geometry, constants etc.
• ImgProc: Filters (blur, gaussian_blur, bilateral_filter), Thresholding (threshold), Coloring (cvt_color), Edge Derivatives (canny, sobel, laplacian), Morphology (erode, dilate, morphology_ex, get_structuring_element), Pyramids (pyr_down, pyr_up, build_pyramid), Feature Detection (good_features_to_track, corner_sub_pix).
• Video: Optical Flow (calc_optical_flow_pyr_lk).
• Calib3d: Pose Estimation (solve_pnp, solve_pnp_ransac), Homography (find_homography), and geometry (rodrigues).

Note: To interface between JavaScript Typed Arrays and purecv-wasm, please use the available getter functions (.data()) which directly retrieve a Float32Array or Uint8Array view into WASM memory.