ncnn-webassembly-nanodet

更新 nanodet-plus 版本

站在巨人的肩膀上，感谢 nihui 大佬

参考 https://github.com/Tencent/ncnn/blob/master/examples/nanodetplus_pnnx.cpp 修改了 nanodet-plus 版本的 Web 版

open https://nihui.github.io/ncnn-webassembly-nanodet and enjoy

build and deploy

1. Install emscripten

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

source emsdk/emsdk_env.sh

2. Download and extract ncnn webassembly package

wget https://github.com/Tencent/ncnn/releases/download/20220216/ncnn-20220216-webassembly.zip
unzip ncnn-20220216-webassembly.zip

3. Build four WASM feature variants

mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DWASM_FEATURE=basic ..
make -j4
cmake -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DWASM_FEATURE=simd ..
make -j4
cmake -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DWASM_FEATURE=threads ..
make -j4
cmake -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DWASM_FEATURE=simd-threads ..
make -j4

4. Deploy the _.data _.js _.wasm and _.html files to your web server

# deploy files
deploy/
├── index.html
├── nanodet-basic.data
├── nanodet-basic.js
├── nanodet-basic.wasm
├── nanodet-simd.data
├── nanodet-simd.js
├── nanodet-simd-threads.data
├── nanodet-simd-threads.js
├── nanodet-simd-threads.wasm
├── nanodet-simd-threads.worker.js
├── nanodet-simd.wasm
├── nanodet-threads.data
├── nanodet-threads.js
├── nanodet-threads.wasm
├── nanodet-threads.worker.js
└── wasmFeatureDetect.js

5. Deploy local server(python3 as a example)

python3 -m http.server --directory deploy

6. Access local server(chrome as a example)

# launch chrome browser, enter following command to address bar and press ENTER:
chrome://flags/#unsafely-treat-insecure-origin-as-secure

# enter following keyword to "Search flags" and press ENTER:
"insecure origins"
you will find "Insecure origins treated as secure" key

#enter local server url and click right side dropdown list, select "Enabled"
url example: http://192.168.1.100:8000

#relaunch chrome browser and access http://192.168.1.100:8000 (replace 192.168.1.100 with your local ip)