piHDR

Scripts for capturing and processing HDR images on a raspberry pi with a raspberrypi compatable camera module

How to use:

execute ./run_hdrcapture.bsh to capture exposure bracketed jpgs, create an HDR image, calculate glare metrics, crate a falsecolor image, and create a tone-mapped image.

Using cron to schedule regular captures.

Use crontab -e to edit crontab file

To capture an hdr image every 5 minutes between 8AM and 7PM on weekdays, add this to the file crontab file:

*/5 8-19 * * 1-5  bash /home/pi/piHDR/run_hdrcapture.bsh

Make sure the pi is set to auto login to the user with the crontab file.

Setting up dependencies

Dependencies include:

• imagemagic sudo apt-get install imagemagick
• Radiance (pfilt, evalglare, pcond, falsecolor, ra_tiff http://www.radiance-online.org/)
• genHDR (http://www.anyhere.com/)
• python
• picamera

Compiling Radiance for Raspberry Pi

sudo apt-get install tcsh
sudo apt-get install libx11-dev
wget --no-check-certificate http://www.radiance-online.org/software/snapshots/radiance-HEAD.tgz
wget --no-check-certificate http://www.radiance-online.org/download-install/radiance-source-code/latest-release/rad5R0supp.tar.gz
tar -xf radiance-HEAD.tgz
tar -xf rad5R0supp.tar.gz
cd ray
sudo ./makeall install

Installing genHDR

wget http://www.anyhere.com/gward/pickup/hdrgen_AMDRaspian.tar.gz
tar -xf hdrgen_AMDRaspian.tar.gz
sudo mv hdrgen /usr/local/bin/.
sudo mv hdrcvt /usr/local/bin/.

Enabling the camera module (added resolution for PiCamera v2 requires 256MB GPU RAM)

sudo raspi-config
select "7 Advanced Options"
select "A3 Memory Split"
Enter "256"
Select "<Ok>"
Select "<Finish>"
Select "<Yes>" in answer to "Would you like to reboot now?"

sudo reboot

Enabling the camera module

sudo raspi-config
select "5 Interfacing Options"
select "P1 Camera"
select "Yes"

sudo reboot

Disable Camera LED

The red LED on the camera module can affect your images, especially if you use clip on lenses. The instructions to disable the LED below come from this website: http://www.raspberrypi-spy.co.uk/2013/05/how-to-disable-the-red-led-on-the-pi-camera-module/

sudo nano /boot/config.txt

add the following:

disable_camera_led=1

Watchits:

• Make sure you have the python library picamera (you should)
• Make sure that you have the camera installed correctly and on the correct port https://www.youtube.com/watch?time_continue=152&v=GImeVqHQzsE
• Set the field of view variables in run_hdrcapture.bsh for your camera + lens combo
• Make sure the path to piHDR in run_hdrcapture.bsh is valid.