ncnn-webassembly-ocrlite

Requirements

• ncnn webassembly
• opencv-mobile webassembly 3.4.13

Build

1. Install emscripten

git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install 2.0.8
./emsdk activate 2.0.8
./emsdk_env.sh

2. Download and extract ncnn & OpenCV

Directory Tree

├─assets
├─demo
├─include
├─ncnn-static
│  └─webassembly
│      ├─basic
│      ├─simd
│      ├─simd-threads
│      └─threads
├─opencv-static
│  └─webassembly
│      ├─bin
│      ├─include
│      ├─lib
│      └─share
└─src

and

Get missing opencv2/imgcodecs.hpp Link
Path: opencv-static/webassembly/include/opencv2

3. Build

mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=/PATH_TO_EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DCMAKE_BUILD_TYPE=Release -DOCR_STATIC=ON ..
make

Demo

demo/index.html

demo/arknights.html

References

• chineseocr_lite
• ncnn-webassembly-yolov5
• ncnn-webassembly-nanodet