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        "description": "# PyTurboJPEG\nA Python wrapper of libjpeg-turbo for decoding and encoding JPEG image.\n\n## Prerequisites\n- [libjpeg-turbo](https://github.com/libjpeg-turbo/libjpeg-turbo/releases)\n- [numpy](https://github.com/numpy/numpy)\n\n## Example\n\n```python\nimport cv2\nfrom turbojpeg import TurboJPEG, TJPF_GRAY, TJSAMP_GRAY, TJFLAG_PROGRESSIVE\n\n# specifying library path explicitly\n# jpeg = TurboJPEG(r'D:\\turbojpeg.dll')\n# jpeg = TurboJPEG('/usr/lib64/libturbojpeg.so')\n# jpeg = TurboJPEG('/usr/local/lib/libturbojpeg.dylib')\n\n# using default library installation\njpeg = TurboJPEG()\n\n# decoding input.jpg to BGR array\nin_file = open('input.jpg', 'rb')\nbgr_array = jpeg.decode(in_file.read())\nin_file.close()\ncv2.imshow('bgr_array', bgr_array)\ncv2.waitKey(0)\n\n# direct rescaling 1/2 while decoding input.jpg to BGR array\nin_file = open('input.jpg', 'rb')\nbgr_array_half = jpeg.decode(in_file.read(), scaling_factor=(1, 2))\nin_file.close()\ncv2.imshow('bgr_array_half', bgr_array_half)\ncv2.waitKey(0)\n\n# decoding JPEG image properties\nin_file = open('input.jpg', 'rb')\n(width, height, jpeg_subsample, jpeg_colorspace) = jpeg.decode_header(in_file.read())\nin_file.close()\n\n# encoding BGR array to output.jpg with default settings.\nout_file = open('output.jpg', 'wb')\nout_file.write(jpeg.encode(bgr_array))\nout_file.close()\n\n# encoding BGR array to output.jpg with TJSAMP_GRAY subsample.\nout_file = open('output_gray.jpg', 'wb')\nout_file.write(jpeg.encode(bgr_array, jpeg_subsample=TJSAMP_GRAY))\nout_file.close()\n\n# encoding BGR array to output.jpg with quality level 50. \nout_file = open('output_quality_50.jpg', 'wb')\nout_file.write(jpeg.encode(bgr_array, quality=50))\nout_file.close()\n\n# encoding BGR array to output.jpg with quality level 100 and progressive entropy coding.\nout_file = open('output_quality_100_progressive.jpg', 'wb')\nout_file.write(jpeg.encode(bgr_array, quality=100, flags=TJFLAG_PROGRESSIVE))\nout_file.close()\n\n# decoding input.jpg to grayscale array\nin_file = open('input.jpg', 'rb')\ngray_array = jpeg.decode(in_file.read(), pixel_format=TJPF_GRAY)\nin_file.close()\ncv2.imshow('gray_array', gray_array)\ncv2.waitKey(0)\n```\n\n## Installation\n\n### macOS\n- brew install jpeg-turbo\n- pip install -U git+git://github.com/lilohuang/PyTurboJPEG.git\n\n### Windows \n- Download [libjpeg-turbo official installer](https://sourceforge.net/projects/libjpeg-turbo/files) \n- pip install -U git+git://github.com/lilohuang/PyTurboJPEG.git\n\n### Linux\n- Download [libjpeg-turbo.repo](https://libjpeg-turbo.org/pmwiki/uploads/Downloads/libjpeg-turbo.repo) to /etc/yum.repos.d/\n- sudo yum install libjpeg-turbo-official\n- pip install -U git+git://github.com/lilohuang/PyTurboJPEG.git\n\n\n## Benchmark \n\n### macOS\n- macOS Sierra 10.12.6\n- Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz\n- opencv-python 3.4.0.12 (pre-built)\n- turbo-jpeg 1.5.3 (pre-built)\n\n| Function              | Wall-clock time |\n| ----------------------|-----------------|\n| cv2.imdecode() \u00a0 \u00a0 \u00a0  |   0.528 sec \u00a0   |\n| TurboJPEG.decode()    |   0.191 sec     |\n| cv2.imencode() \u00a0 \u00a0 \u00a0  |   0.875 sec \u00a0   |\n| TurboJPEG.encode()    |   0.176 sec     |\n\n### Windows \n- Windows 7 Ultimate 64-bit\n- Intel(R) Xeon(R) E3-1276 v3 CPU @ 3.60 GHz\n- opencv-python 3.4.0.12 (pre-built)\n- turbo-jpeg 1.5.3 (pre-built)\n\n| Function              | Wall-clock time |\n| ----------------------|-----------------|\n| cv2.imdecode() \u00a0 \u00a0 \u00a0  |   0.358 sec \u00a0   |\n| TurboJPEG.decode()    |   0.135 sec     |\n| cv2.imencode() \u00a0 \u00a0 \u00a0  |   0.581 sec \u00a0   |\n| TurboJPEG.encode()    |   0.140 sec     |",
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