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  • Kankamuso commented on MaykeS1's instructable A Raspberry Pi Multispectral Camera1 year ago
    A Raspberry Pi Multispectral Camera

    So this is getting complicated ! XD. I currently have some DJI cameras on board my drones. Some of them are used for NDVI calculation and are both CMOS and RGB based but the IR filter is removed. Therefore I supposed I can use a filtered RGB to compute the NVDI (at least a variant). I want to go seriou with this so I will have a look at the FPGAs option. Not know where to start though... I also own a Parrot Sequoia but it is failing so I decided I can do something similar as a computer scientist but I lack expertise on this field as well as special purpose optics. In fact I feel there is still place for a-so-compact and inexpensive camera for drones work... don't you think so? Thanks a lot!

    Thanks a lot!. Delay is a serious problem as I am planning to use it with a flying wing. I am intrigued as how do the commercial cameras solve this issue... Perhaps an intermediate buffer... don't know. I will definitely go for a global shutter camera (not really sure if monochrome or just a RGB and a NIR. Any suggestions based on your experience?Regards, Jose

    The sequoia is a second hand one and whenever I connect the sunshine sensor it hangs on shooting :-(. I still don't know the cause but something is causing it to reboot ort just freeze (and drops wifi connection). So it is unusable at this time. The DJI cameras are single mountable on my drones (Matrice 100 and Matrice 200) so I have to decide whether I get a NDVI or a visible orthomosaic so I have to fly twice to get both. This is an enormous waste of time (and batteries) so a single camera having it all would be nice. But, with all of that, my main motivation is testing my habilties and creating something on my own. If I can use it later commercially it would be an extra and welcome outcome :-). But... I do not have much time and there is not much information out there. At this moment...

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    The sequoia is a second hand one and whenever I connect the sunshine sensor it hangs on shooting :-(. I still don't know the cause but something is causing it to reboot ort just freeze (and drops wifi connection). So it is unusable at this time. The DJI cameras are single mountable on my drones (Matrice 100 and Matrice 200) so I have to decide whether I get a NDVI or a visible orthomosaic so I have to fly twice to get both. This is an enormous waste of time (and batteries) so a single camera having it all would be nice. But, with all of that, my main motivation is testing my habilties and creating something on my own. If I can use it later commercially it would be an extra and welcome outcome :-). But... I do not have much time and there is not much information out there. At this moment I have access to FPGAs but I don't know how to connect available cameras ("cheap" ones with global shutter). I have seen the ArduCam products and they seem promising for my needs, being the lag the only aparent problem at this moment... In short, I am looking to create something and see it work ! :-)

    It seems my last comment was removed or was not published... I am having a look at literature but I have no experience with FPGAs so I don't know where to start from. I have been using RGBs (with filter removed) cameras to calculate NDVI (DJI cameras, so not cheap ones by the way) and also have a Parrot Sequoia. But still thing a customized, cheaper camera can do the job better for our needs... Let's see how I make it. Thanks!

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