.. _jpeg:

JPEG
========

Overview
--------

**jpeg**  codec driver example project shows how to convert **YUV picture data**  into **RGB data**  and **RGB data**  into **YUV data** .
- decoding function: extract the sample JPG picture data source, the **huffmin** , **huffbase** , **huffsymbol** , **huffenc** , **decoder Q value**  table information and **YUV pixel stream**  data in the picture data, decode the **YUV data**  into **RGB data**  through the hardware JPEG module, and display the original picture information through the **LCD** .

- encoding function: encode the picture **rgb565 pixel stream**  data and **huffmin** , **huffbase** , **huffsymbol** , **huffenc** , **encoder Q value**  table information through the hardware JPEG module, encode the **RGB data**  into **YUV data**  , then restore it to RGB data through the decoding process, and display the original picture information through the **LCD screen**

Board Setting
-------------

- Connect **LCD screen**  to development board ``lcd1``

Running the example
-------------------

When the project runs correctly, the LCD screen will display the picture information of green bamboo correctly, and the serial port terminal will output the following information:

.. code-block:: console

   > jpeg example
   > start decoding
   > decoding done
   > start encoding and decoding
   > encoded 833
   > encoding and decoding done