A list of utilities

1. capture luckfox

capture nv12 format and convert it to rgb bmp file!

gcc cap_nv12.c -o capluck

Usage: ./capluck [options]

Options: -d | --device name Video device name [/dev/video11] -h | --help Print this message -c | --count Number of frames to grab [1] -w | --width Frame width -v | --height Frame height

2. nv12 to rgb conversion for 'NV12' (Y/CbCr 4:2:0) format (as it comes from luckfox cameras)

compilation (I use an alpine armv7 docker container with these packages: openssh git gcc musl-dev gd-dev make linux-headers)

gcc nv12_to_rgb.c -o nv12convert

execute on container or on target with:

• ./nv12convert nv12.img output.bmp 800 600

The nv12.img was captured with:

• v4l2-ctl --device=/dev/video11 --set-fmt-video=width=800,height=600,pixelformat=NV12 --stream-mmap --stream-to=nv12.img --stream-count=1 camera settings was set with:
• v4l2-ctl -d /dev/v4l-subdev2 --set-ctrl=exposure=200,analogue_gain=800,vertical_flip=1

Result