This is the documentation for the latest (main) development branch of HPM SDK. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

10.2. JPEG encode

10.2.1. Overview

JPEG decoding example project demonstrates how to encode an image capture from camera sensor to a JPG file using either JPEG module or software jpeg library

10.2.2. Board Setting

  • Connect the USB disk to the development board usb0, or insert the SD memory card into the development board SD card

  • Connect LCD screen and Cam camera to development board

10.2.3. Engineering configuration

  • File CMakeLists.txt. If set (JPEG_USE_SDCARD 1) is configured, jpeg files are stored in SD card or set (JPEG_USE_UDISK 1), they will be saved to udisk.

10.2.4. Store picture size

  • The image format stored in this routine is JPG, and the resolution size is 640*480

10.2.5. Running the example

  • Configure storage in CMakeLists.txt

  • Connect camera senor, LCD pannel and storage to board

  • Power on the board

  • Download built elf into development board and run the demo

  • If everything goes well:

    • camera sensor preview will be shown on LCD panel

    • press GPIO button (please check Button section of specific board) will save current frame and encode to jpeg file and save to target storage

    • encoded image will be decoded and shown on LCD pannel until GPIO button is pressed again. Once it’s been pressed, preview will be resumed.