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by Egg_man
Thu Dec 02, 2021 9:51 am
Forum: Beginners
Topic: GPIO error: Device or resource busy
Replies: 0
Views: 63

GPIO error: Device or resource busy

Hi there, I am trying to set up the communication between a RPi zero 2 and an FPGA via SPI. However, I need two extra pins other than the four standard SPI ones for RESET and DONE signals. Therefore, I ended up on the website https://www.ics.com/blog/how-control-gpio-hardware-c-or-c , and I copied a...
by Egg_man
Fri Oct 26, 2018 8:46 am
Forum: Camera board
Topic: Effect of ISO in raspistill RAW image acquisition
Replies: 2
Views: 1488

Re: Effect of ISO in raspistill RAW image acquisition

Thank you, that's very useful. Is there any documentation on how the final ISO value is calculated from these? And when acquiring RAW images, are the digital gain factors applied to the RAW data, or only the analog gain is?
by Egg_man
Thu Oct 25, 2018 2:53 pm
Forum: Camera board
Topic: Effect of ISO in raspistill RAW image acquisition
Replies: 2
Views: 1488

Effect of ISO in raspistill RAW image acquisition

I acquired some RAW images with raspistill with different shutter speeds, but I forgot to set the ISOs (I realized that by checking the exif info). However, the digital RAW values I got seem to have all the same ISO setting (since I am doing some radiometric evaluation, I have precise control of the...
by Egg_man
Tue Oct 02, 2018 2:19 pm
Forum: Camera board
Topic: RAW output information
Replies: 236
Views: 124429

Re: RAW output information

Hi! I have a question: what's the quickest way to extract the RAW information from the jpeg image into a numpy array? I did acquire a set of pictures with raspistill -r because setting the exposure time in picamera gave me some problems, and now I'd like to process them with Python and OpenCV.

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