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* ROSboard -- visualize ROS topics in the web browser -- https://github.com/dheera/rosboard https://github.com/dheera/rosboard Lots of things that could be don

by dheera 3y ago

* ROSboard -- visualize ROS topics in the web browser -- https://github.com/dheera/rosboard https://github.com/dheera/rosboard Lots of things that could be done with this but a lot of robotics teams and projects got laid in the past year and it doesn't have as many users as it once did. There is also Foxglove which is a full-blown funded startup working on something similar and the more progress they make, the less motivation I have to make my FOSS project better, as a one-person team. * Air quality monitor -- https://dheera.net/projects/airmonitor/ https://dheera.net/projects/airmonitor/ Unfinished due to the PM2.5 sensor in it (PMSA003I) always reporting 0 and Adafruit not caring. * BotParty -- telepresence robots -- https://dheera.net/projects/botparty/ https://dheera.net/projects/botparty/ Unfinished since COVID isolation ended and telepresence parties aren't needed anymore * Luxo -- jumping Pixar lamp -- https://dheera.net/projects/luxo/ https://dheera.net/projects/luxo/ Unfinished due to lack of time but it does scoot and jump. * Digital 4x5 camera back -- https://dheera.net/projects/4x5/ https://dheera.net/projects/4x5/ Unfinished due to issues with CRA optimization on the microlens array on the Pi HQ camera and unavailability of a real HQ camera with an actually large (e.g. 35mm) sensor. * E-ink picture frame -- https://dheera.net/projects/einkframe/ https://dheera.net/projects/einkframe/ Pending to be done: (a) Get rid of the unsightly USB power wire, use a battery or super-capacitor and a thin strip of solar panel on top of the frame, and ESP32 deep sleep mode and have it update once every hour or so. (b) Update it to use a diffusion model in the cloud for image generation (c) Add a microphone and a mode where you can yell a prompt at it and it draws it

mikewarot 3y ago
In reading about your 4x5 camera back, I think the plastic lens mount might be obstructing the light going to the sensor, the angles inside such a wide format system are fairly large. If possible, I'd suggest removing it. As far as I can tell, there's no lens array on the sensor[1][2], just a normal Bayer filter. You could get a calibration frame by removing the lens with the sensor centered, and a black frame by putting a lens cap on, to help with corrections. That looks like a really fun project. With the HDR mode of the sensor you should get some awesome images. Good luck! [1] https://www.sony-semicon.com/files/62/pdf/p-13_IMX477-AACK_Flyer.pdf https://www.sony-semicon.com/files/62/pdf/p-13_IMX477-AACK_F... - (PDF) Flyer [2] https://www.uctronics.com/download/Image_Sensor/IMX477-DS.pdf https://www.uctronics.com/download/Image_Sensor/IMX477-DS.pd... - (PDF) Data Sheet
- dheera 3y ago
  Thanks! > I think the plastic lens mount might be obstructing the light going to the sensor It's actually a low-profile, 3D printed thing housing a glass UV/IR cut filter. The housing is flush with the glass filter unlike the stock Pi HQ camera lens holder. Removing the UV/IR cut results in full-spectrum photos that manifest the same color shift problem which is characteristic of CRA optimization (where they deliberately put the microlenses off-center toward the edges of the sensor. > As far as I can tell, there's no lens array on the sensor[1][2] I thought there is a lens array on almost all Sony sensors? [2] for example lists a "CRA characteristics of recommended lens" section on page 47, but this is not the full datasheet and only goes upto page 25. I can't find the full datasheet on the public internet unfortunately.
  - mikewarot 3y ago
    Well, if you want to try something different, here's a modified camera that removes the microlens array along with color filters to make the sensor monochrome.[1] [1] https://maxmax.com/maincamerapage/uvcameras/raspberry-pi-hq-12mp https://maxmax.com/maincamerapage/uvcameras/raspberry-pi-hq-...
    - mikewarot 3y ago
      Alternatively, you could tilt the sensor as you move it to compensate. Perhaps moving it on a curved path to match the optical center? I don't know how well that would work with variable focal length lenses, though. If you've ever seen a ball cutter attachment for a lathe, or one of those parallax eliminating camera mounts, you could step the sensor along a sphere instead of a plane.

by dheera 3y ago

mikewarot 3y ago

In reading about your 4x5 camera back, I think the plastic lens mount might be obstructing the light going to the sensor, the angles inside such a wide format system are fairly large. If possible, I'd suggest removing it. As far as I can tell, there's no lens array on the sensor[1][2], just a normal Bayer filter. You could get a calibration frame by removing the lens with the sensor centered, and a black frame by putting a lens cap on, to help with corrections. That looks like a really fun project. With the HDR mode of the sensor you should get some awesome images. Good luck! [1] https://www.sony-semicon.com/files/62/pdf/p-13_IMX477-AACK_Flyer.pdf https://www.sony-semicon.com/files/62/pdf/p-13_IMX477-AACK_F... - (PDF) Flyer [2] https://www.uctronics.com/download/Image_Sensor/IMX477-DS.pdf https://www.uctronics.com/download/Image_Sensor/IMX477-DS.pd... - (PDF) Data Sheet

dheera 3y ago
Thanks! > I think the plastic lens mount might be obstructing the light going to the sensor It's actually a low-profile, 3D printed thing housing a glass UV/IR cut filter. The housing is flush with the glass filter unlike the stock Pi HQ camera lens holder. Removing the UV/IR cut results in full-spectrum photos that manifest the same color shift problem which is characteristic of CRA optimization (where they deliberately put the microlenses off-center toward the edges of the sensor. > As far as I can tell, there's no lens array on the sensor[1][2] I thought there is a lens array on almost all Sony sensors? [2] for example lists a "CRA characteristics of recommended lens" section on page 47, but this is not the full datasheet and only goes upto page 25. I can't find the full datasheet on the public internet unfortunately.
- mikewarot 3y ago
  Well, if you want to try something different, here's a modified camera that removes the microlens array along with color filters to make the sensor monochrome.[1] [1] https://maxmax.com/maincamerapage/uvcameras/raspberry-pi-hq-12mp https://maxmax.com/maincamerapage/uvcameras/raspberry-pi-hq-...
  - mikewarot 3y ago
    Alternatively, you could tilt the sensor as you move it to compensate. Perhaps moving it on a curved path to match the optical center? I don't know how well that would work with variable focal length lenses, though. If you've ever seen a ball cutter attachment for a lathe, or one of those parallax eliminating camera mounts, you could step the sensor along a sphere instead of a plane.