Here we are going to discuss about the most incredible feature that OpenCV library has newly. The good news is that you can run image processing code using JavaScript code. So it would be very simple to have image processing feature for websites and I think that is awesome. Feel free and leave comment your opinion about this feature. because I really love this feature I will try to share tutorials about image processing in JS.
How to install Opencv-JS
First of all we need the OpenCV sources. To build JS file you should install emscripten. Installation is really easy just check this link. Emscripten is a toolchain for compiling to asm.js and WebAssembly, built using LLVM, that lets you run C and C++ on the web at near-native speed without plugins. This is a really useful SDK and I would like to share more about it in later posts.
The next Step is like following:
1.To build opencv.js, execute python script <opencv_src_dir>/platforms/js/build_js.py <build_dir>. For example, to build in build_js directory:
>>cd opencv
>>python ./platforms/js/build_js.py build_js
Note: It requires python and cmake installed in your development environment.
2.The build script builds asm.js version by default. To build WebAssembly version, append --build_wasm switch. For example, to build wasm version in build_wasm directory:
>> python ./platforms/js/build_js.py build_wasm –build_wasm
[optional] To build documents, append --build_doc option. For example: >>python ./platforms/js/build_js.py build_js –build_doc
Note: It requires doxygen installed in your development environment.
[optional] To build tests, append --build_test option. For example: python ./platforms/js/build_js.py build_js –build_testTo run tests, launch a local web server in <build_dir>/bin folder. For example, node http-server which serves on localhost:8080. Navigate the web browser to http://localhost:8080/tests.html, which runs the unit tests automatically. You can also run tests using Node.js. For example: cd binnpm installnode tests.jsNoteIt requires node installed in your development environment.
Now you can test your code. Take a photo from you and draw a red rectangular boarder around it. It’s really simple and fun. you can download the pre-built library in this link
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