Matrix - CAM500B

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1 Introduction

CAM500A

• The CAM500B module uses Omni Vision’s QSXGA CMOS OV5640 module. It has DVP parallel output interface and supports up to 2592 x 1944 photographing and 720P@30fps video recording. It has automatic image control functions: AFC, AWB and AEC etc.

• The CAM500B uses a cell phone camera. This camera’s focal length is 2.7mm. Its aperture is 2.8. Its viewing angle is 66 degree.

2 Features

• 5MP (2592 x 1944) photographing, 720P@30fps video recording
• Focal length: 2.7mm, Aperture: 2.8, Viewing angle: 66 degree
• Automatic image control functions: AFC, AWB and AEC etc
• 24 PIN FPC interface including DVC parallel output, 3.3V power, I2C and GPIO

3 Connect CAM500B to S5P4418/S5P6818 Boards

• If your 4418/6818 based board runs Android5.1 and it is connected to FriendlyElec's LCD or an HDMI monitor after Android is fully loaded click on the "Camera" icon and the application will be started. You can take pictures or record videos.
• Under Debian/Ubuntu a camera utility "nanocams" is available for previewing 40 frames and picture taking.You can try it by following the commands below:

sudo nanocams -p 1 -n 40 -c 4 -o IMG001.jpg

For more details about the usage of the nanocams run "nanocams -h". You can get its source code from our git hub:

git clone https://github.com/friendlyarm/nexell_linux_platform.git

3.1 Connect CAM500B to NanoPi M2

• NanoPi M2 works with CAM500B

3.2 Connect CAM500B to NanoPi 2

• NanoPi 2 works with CAM500B.

3.3 Connect CAM500B to NanoPi 2 Fire

• NanoPi 2 Fire works with CAM500B.

3.4 Connect CAM500B to NanoPC-T2

• NanoPC-T2 works with CAM500B

3.5 Connect CAM500B to Smart4418

• Smart4418 works with CAM500B

3.6 Connect CAM500B to NanoPi M3

• NanoPi M3 works with CAM500B

3.7 Connect CAM500B to NanoPC-T3

• NanoPC-T3 works with CAM500B

4 连接H3开发板使用

启动Debian/Ubuntu系统，连接网络，以root用户登录终端并编译运行mjpg-streamer:

cd /root/mjpg-streamer
make
./start.sh

mjpg-streamer是一个开源的网络视频流服务器，在板子上成功运行mjpg-streamer后会打印下列信息:

 
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: YUV
 i: JPEG Quality......: 90
 o: www-folder-path...: ./www/
 o: HTTP TCP port.....: 8080
 o: username:password.: disabled
 o: commands..........: enabled

假设M1的IP地址为192.168.1.230，在PC的浏览器中输入 192.168.1.230:8080 就能浏览摄像头采集的画面了，效果如下:

mjpg-streamer是用libjpeg对摄像头数据进行软编码，你可以使用ffmpeg对摄像头数据进行硬编码，这样能大大降低CPU的占用率并提高编码速度:

ffmpeg -t 30 -f v4l2 -channel 0 -video_size 1280x720 -i /dev/video0 -pix_fmt nv12 -r 30 -b:v 64k -c:v cedrus264 test.mp4

默认会录制30秒的视频，输入q能终止录制。录制完成后会在当前目录生成一个名为test.mp4的视频文件，可将其拷贝到PC上进行播放验证。

4.1 连接NanoPi M1使用

4.2 连接NanoPi NEO Air使用