Raspberry Pi Forums

HermannSW

Nice, today the two ordered M12 extension rings arrived as well, and a Realacc soldering station allowing to hold the now 12cm long Raspberry camera plus 4 extension rings plus 70mm lens and give more stable images than with my hand: https://twitter.com/HermannSW/status/987661223868198912 Did not cl...

HermannSW

The 3.98° lens arrived after only 21 days, with 9$ it is much more expensive than the other lenses: https://www.aliexpress.com/item/HD-2-Mega-Pixel-CCTV-Lens-pinhole-70MM-M12-0-5-Mount-1-F1-6-3/32746976750.html https://stamm-wilbrandt.de/en/forum/70mm.M12.png Technical data: Focal length:70mm Mount:...

HermannSW

I will start working on providing high framerate options to raspiraw for v2 camera (besides --fps) soon. As a first quick test I wanted to follow up on 424fps recodings (640x480, but only top 215 lines got updated) posted earlier in this thread: https://www.raspberrypi.org/forums/viewtopic.php?t=109...

HermannSW

Recently I got a nice surprise at work, was asked "do you want that 4k monitor?":
https://twitter.com/HermannSW/status/981848283961352192

Today I connected my Pi 3B+ to that monitor without problems, full HD only, nice anyway:

HermannSW

What is the output of running this command?

Code: Select all

vcgencmd get_camera

HermannSW

From table here: https://www.raspberrypi.org/documentation/raspbian/applications/camera.md ... 5 1296x730 16:9 1-49fps Full 2x2 6 640x480 4:3 42.1-60fps Full 2x2 plus skip 7 640x480 4:3 60.1-90fps Full 2x2 plus skip ... Btw, you can do up to 665fps with v1 camera: http://stamm-wilbrandt.de/en/Raspbe...

HermannSW

I did tweet on my preparation for two camera recording of 1000KV sparks in my motor test station: https://twitter.com/HermannSW/status/985266045165428737 Luckily I got a warning response on twitter wrt alligator clips being dangerous for the cables. I then did tape both cables so that alligator clip...

HermannSW

The camera can flip view horizontally and vertically, see 5-4 of datasheet: https://github.com/rellimmot/Sony-IMX219-Raspberry-Pi-V2-CMOS/blob/master/RASPBERRY%20PI%20CAMERA%20V2%20DATASHEET%20IMX219PQH5_7.0.0_Datasheet_XXX.PDF horizontal+vertical flip is rotation by 180°. OpenCV should be able to r...

HermannSW

In 2015 there was a robot competition in Písek/Czech Republic. https://robotika.cz/competitions/robotour/2015/en The robot had to transport 5l beer through a park autonomously. My son was member of winner team with robot "Beteigeuze" (students from KIT/Germany): https://www.kamaro.kit.edu/178.php Th...

HermannSW

Yes, Pi 3B or 3B+ are quicker than Pi Zero, but most times single core performance is what is needed, and even that is not an issue for microscope application. See here for a specific lot of integer processing optimized C programm Zero needs 30μs, Pi 2B 27μs, Pi 3B needs 17μs and Pi 3B+ needs 14μs r...

HermannSW

Then start with Pi Zero W (10$), v1 night vision camera with M12 lens (10$), Pi Zero camera cable (1$), M12 extension rings (2x2$) and some lenses (few dollars each).

HermannSW

As our aim to lower the budget as much as possible, does the 8mp camera worth it by comparison to the 5mp? It is good to have one v2 camera, as it can eg. take VGA videos at 180fps with full GPU support, and it has 8MP compared to 5MP for v1 camera. On the other hand you get v1 camera for 6$ with f...

HermannSW

Today new 1000KV(!) igniter module arrived: https://stamm-wilbrandt.de/en/forum/1000KV.igniter.png It can do 1000KV with 7.4V input voltage, and generate 2cm sparks. Today I did connect only one 600mAh 25C lipo via a motor controller controlled by Pi Zero, and made 1cm sparks. I gave 4.05V to input ...

HermannSW

Shutter time option is really needed for raspivid, 1.5ms is too blurry for closing mouse trap. Youtube video played a 1fps gives a better feeling for where the mouse bar is compared to single frame: https://www.youtube.com/watch?v=jMjWJ89WpyM&feature=youtu.be The spark shows that piezo trigger got a...

HermannSW

What is the purpose of the "IR 1080P f6.0mm 1/2.7" lens (65°)"? Take image of very small item like the ball? I had no experience with cameras or lenses, so I bought different angle sensors (65°, 20°, 130° and 150°). My experiments sofar confirmed my assumption that less degree gives better resoluti...

HermannSW

> Do you have other kind of picture of small objects, sand grains... things like this? > I posted all in the thread I pointed to. See below photo that you need to have all interesting stuff in same distance, at least with 65° lens (a roughly 1mm diameter tin solder ball). > Can you tell me more abou...

HermannSW

Not sure why you need the microscope ;-), see image below. With Raspberry v2 camera (8MP), M12 lens mount, IR 1080P f6.0mm 1/2.7" lens (65°) and two M12 extension rings you can take images with down to 0.77μm/pixel, in a 3280×2464 pixel image: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=...

HermannSW

"665fps mouse trap closing played at 1fps"
https://www.youtube.com/watch?v=5TuBjqj ... e=youtu.be

HermannSW

I want to set shutter time with raspiraw to 0.25ms. https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=201568&p=1299787#p1299787 I tried "--expus" with values 250, 25 and even 5, but all frames have same brightness. Then I realized that raspiraw seems not to have shutter time option, only expos...

HermannSW

The frames were NOT taken with 0.25ms shutter time, I have problems to get shutter time working with raspiraw. So shutter time for the frames shown is frame delta time which is 1.5ms. This explains the slightly blurry frames. I asked in raspiraw thread for help: https://www.raspberrypi.org/forums/vi...

HermannSW

I switched to v1 camera for really high framerate video. I did a 665fps video with raspiraw 640x128_s tool. In order to move the mouse trap into the top 128 rows (vertically as in last video in order to reduce rolling shutter effect) I moved the camera further back, and exchanged the 65° lens by a 1...

HermannSW

What you describe in altering the shutter speed will not really alter the rolling shutter effect due to movement (object in the scene or of the overall sensor). Correct, but I found another way to reduce rolling shutter effect a bit. For a closing mouse trap the speed increases steadily by constant...

HermannSW

I found a way to reduce the rolling shutter effect a bit -- just turn the camera by 90°. Below you can see frames from different videos with 0.25ms shutter time sorted by position of mouse trap bar: https://stamm-wilbrandt.de/en/forum/mt/Screenshot345.png https://stamm-wilbrandt.de/en/forum/mt/Scree...

HermannSW

I tried with different shutter times, and 0.25ms gave good videos, and the moving mouse trap bar was not blurred anymore. So I took ten videos. This is from 1st of these videos, and I realized that no spark showed up. Seems that yesterday's last hit by mouse trap bar destroyed it. Will buy more 1$ l...

HermannSW

Recently I found another really cheap high framerate gadget, a 5ct spinning coin passing in front of camera: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=206047&p=1293730#p1293730 Sparks on the other hand are no high framerate gadget, although they really look nice: https://www.raspberryp...

Search found 2700 matches

Re: Creating a RPI-assisted microscope

Re: Creating a RPI-assisted microscope

Re: Raw sensor access / CSI-2 receiver peripheral

37" is nice HDMI monitor size for Pi 3B+ ;-)

Re: Pi NOIR not working

Re: Max FPS on Raspberry pi zero with cam 1.3

Re: Capturing 2.5mm sparks with Raspberry camera

Re: Permanently Rotate / Flip Camera

Re: Beer transporting robot

Re: Creating a RPI-assisted microscope

Re: Creating a RPI-assisted microscope

Re: Creating a RPI-assisted microscope

Re: Capturing 2.5mm sparks with Raspberry camera

Re: Cheap local high framerate gadget

Re: Creating a RPI-assisted microscope

Re: Creating a RPI-assisted microscope

Re: Creating a RPI-assisted microscope

Re: Cheap local high framerate gadget

Re: Raw sensor access / CSI-2 receiver peripheral

Re: Cheap local high framerate gadget

Re: Cheap local high framerate gadget

Re: IMX219 rolling shutter effect severity

Re: Cheap local high framerate gadget

Re: Cheap local high framerate gadget

Re: Cheap local high framerate gadget