[HN Gopher] DIY Camera Using Raspberry Pi
___________________________________________________________________
DIY Camera Using Raspberry Pi
Author : the_arun
Score : 145 points
Date : 2021-04-19 04:18 UTC (18 hours ago)
(HTM) web link (ruha.camera)
(TXT) w3m dump (ruha.camera)
| dheera wrote:
| I _really_ _really_ _really_ wish RPi would come out with a
| _real_ HQ camera with at least an APS-C if not 36x24mm sensor.
| This dinky little IMX477 sensor is MQ, not HQ.
|
| The uses would be endless, ranging from astrophotography to real
| professional-quality shots with homemade, scriptable cameras;
| shots synced with high-speed motion; a whole new era of homemade
| SLRs and mirrorless cameras that are actually competent; lots of
| things I can think of.
| bmurphy1976 wrote:
| Also fix the interface so that you can actually record 4k
| video. The sensor is capable but the interface is not.
|
| https://www.raspberrypi.org/forums/viewtopic.php?t=281095
| terramex wrote:
| RPI HQ camera is almost usable for astrophotography, here are
| few shots I did with it last year:
| https://terramex.neocities.org/astro/
|
| Of course it make little sense from financial point of view as
| good star tracker and optics are magnitudes more expensive but
| it was fun.
|
| I agree with rest of your post. Even MFT-size sensor would be
| great as there are plenty great lenses with that image circle
| size.
| mnw21cam wrote:
| I'm just comparing your Bode's Galaxy (f/3.3, 200mm, 120x21s)
| with my recent attempt (f/6.3, 600mm, 42x30s), and besides
| magnification, the result seems fairly similar - if anything,
| I think the dark sections of your image are less noisy. Your
| arrangement collected about 7.2 times as much light (ignoring
| magnification), so that's not surprising. I was using a Nikon
| D7500, so if the RPI HQ camera is comparing reasonably
| favourably with that, then yes that's not bad.
| dheera wrote:
| Yeah it's barely usable, but not great, because ultimately
| larger sensors will still give you better SNR for
| astrophotography. A sensor with 10X the area will be able to
| produce an image with the same final SNR in 1/10 the time.
|
| Also I had lots of faint banding issues with RPi cameras.
| Nobody was able to solve my problem on forums.
|
| https://www.raspberrypi.org/forums/viewtopic.php?t=287866
| terramex wrote:
| I've seen similar banding in some tests when I had set
| analog gain to 1.0 on a warm night. With analog gain set to
| 16.0 and Peltier cooler attached to back of camera PCB it
| was gone.
|
| My guess is that IMX477 does some software de-noise that
| causes banding. I tested this guess by calculating power
| spectrum of a dark frame and there was noticeable drop in
| higher frequencies. Unfortunately, even disabling hot-pixel
| detection did not help. I did not investigate it further.
| dheera wrote:
| > Peltier cooler attached to back of camera PCB
|
| Do you have plans or pics of how to do this? Especially
| how to do it without getting condensation on the
| electronics?
|
| Thanks!
| terramex wrote:
| Honestly, it is just a frankenstein monster of whatever I
| had on hand: https://imgur.com/a/QhvmbUa
|
| 3mm thermal pad I used between PCB and cooler:
| https://botland.store/thermoconductive-tapes-
| pastes/6060-the...
|
| Radiator (I used the smaller one that typically goes on
| cold side of Peltier): https://botland.store/peltier-
| elements/10024-heatsink-with-a...
|
| Fan is standard 40mmx40mm, there is some generic copper
| thermal paste between Peltier and radiator. The plywood
| mount is DIY made with with hole drills. It is a bit too
| thick so I used 2x C-CS mount adapters (like the one
| bundled with the camera) to get more space, otherwise I
| would not be able to screw in lens adapter.
|
| There was a bit of neoprene foam between radiator and fan
| to reduce vibrations but it looks like I lost it
| somewhere.
|
| About condensation: it was always wet or even icy in
| operation but it never caused any electrical issues, I
| guess condensed water was not very conductive? Once on a
| cold night (about 5C) I had water condensation on the
| sensor itself but it did not cause any lasting damage.
| I've read that putting a fresh silica gel desiccant
| packet into lens adapter helps. I had plans to attach
| temperature probe to lens mount and control cooling power
| form Pi itself, will get back to it in the future. The
| camera sensor itself has embedded thermometer but it is
| not exposed in camera driver.
| PragmaticPulp wrote:
| APS-C sensors are still significantly more expensive than
| common sensors like the IMX477. Demand would be much lower due
| to the high price for the sensor and additional cost for lenses
| and mounting hardware.
|
| RPi foundation isn't really targeted at the niche, high-end,
| low-volume markets that demand the best of the best. They're
| great at delivering an excellent compromise of cost and
| quality. The IMX477 is just right for most use cases.
|
| The sensor alone doesn't deliver 100% of the result of a modern
| SLR. The image processing code does a lot of heavy lifting that
| is mostly proprietary. The open source options are improving,
| but connecting an APS-C sensor to an R-Pi wouldn't
| automatically give you a DIY SLR competitor.
|
| You'd spend a lot more in the process and get worse results
| than just buying a commercial SLR camera and running open-
| source scriptable firmware like Magic Lantern:
| https://magiclantern.fm/
| dheera wrote:
| > Demand would be much lower
|
| Lenses for full frame cameras are _super cheap_ -- you can
| find tons of old Russian, Japanese, and East German lenses
| that will work really well. Many of those lenses are built
| like tanks and can be had for <$100, some <$50. Most of them
| produce _very nice_ images and aesthetically have much better
| look than what I see out of these CCTV lenses for the Pi HQ
| camera. CCTV lenses were never designed for art, and among
| other things produce horrible out-of-focus highlights.
|
| > The image processing code
|
| Well yes, that's also the point, by having an open source
| APS-C or full frame camera you can tinker to your heart's
| content with changing the image processing code.
|
| I use Magic Lantern extensively and there's only so much you
| can do with it, and it's a pain in the ass to recompile code
| for it. Having a full-fledged Linux system with gcc, opencv,
| python, and pytorch at my disposal on camera, and with Wi-Fi,
| Bluetooth, USB, and running an SSH server, and the ability to
| connect arbitrary I2C and SPI sensors, would be freaking
| amazing, to say the least.
|
| Wildlife camera with thermal camera trigger and a neural net
| that recognizes mountain lions? You got it.
|
| LIDAR-based insanely accurate servo-driven autofocus? You got
| it.
|
| Microphone array that figures out who in the picture is
| talking and refocuses the camera to that person? You got it.
|
| Home-made Alt-Az tracker with built-in autoguider and remote
| Wi-Fi progress monitoring? You got it.
|
| And if it can be made to work with the Pi, someone will
| hopefully also make it work with a Jetson Nano or Xavier NX
| and then voila I could do some neural net processing in real-
| time on-board. I've been able to blow Canon's in-camera
| denoising out of the water with state-of-the-art neural nets
| by postprocessing RAW images, and if I had a Xavier or Nano
| on-board I could easily put those neural nets in-camera for
| convenience.
|
| The possibilities are endless, which is why I really want
| this hardware so much.
| PragmaticPulp wrote:
| Everything you described can be built out with this
| existing sensor and hardware.
|
| You don't need an APS-C or larger sensor to get decent
| images. Most APS-C sensors use a different high-speed
| interface that won't work with the Raspberry Pi anyway.
|
| Really, this solution from the Raspberry Pi foundation is a
| great start for any of the projects you mentioned. It's
| also cheap and highly available.
| dheera wrote:
| > You don't need an APS-C or larger sensor to get decent
| images.
|
| I don't have the space and time to debate the merits here
| but there is a reason they exist, there are lots of
| things you can get by having a large sensor (including a
| different aesthetic and better SNR for low light images)
| and I want those things with a hackable interface and
| programmatic control of whatever the sensor is capable
| of.
|
| I've been doing photography with full frame sensors for a
| a decade after upgrading from APS-C and telling me "you
| don't need an APS-C camera" without understanding why I
| use a full frame camera or the work I produce with them
| isn't really helpful.
| porphyra wrote:
| APS-C sensors are maybe only a few hundred bucks.
|
| I would love to have a nice APS-C or full frame board-level
| camera that can be easily integrated into something like a
| Raspberry Pi. At present it is nearly impossible to get
| something like that --- dev kits for large sensors from Sony
| Semicon, Canon, and ams are profoundly expensive, only sold
| to companies, and go through a lengthy quoting process.
|
| > The sensor alone doesn't deliver 100% of the result of a
| modern SLR. The image processing code does a lot of heavy
| lifting that is mostly proprietary.
|
| This is HN, hackers like us love to be able to tinker with
| the heavy lifting. That's the whole point of the Raspberry Pi
| cameras. Even with the current HQ camera, a used point-and-
| shoot camera with a similarly-sized sensor (or even bigger
| sensor) would tend to produce better images and videos while
| being more compact, robust, convenient, and cheaper than the
| DIY camera.
| dheera wrote:
| > At present it is nearly impossible to get something like
| that
|
| So in the astrophotography world they exist. This for
| example:
|
| https://astronomy-imaging-camera.com/product/asi6200mc-
| pro-c...
|
| uses an IMX455 full frame sensor, gives you a reasonably
| hackable full frame camera (not that well supported, but
| there are grassroots libraries around) but it's $4000
| because it's also a cooled camera.
|
| If they had a version of it that's not cooled and just for
| normal photography for $1000 that'd be awesome.
| PragmaticPulp wrote:
| > APS-C sensors are maybe only a few hundred bucks.
|
| Where are you sourcing APS-C sized MIPI CSI sensors for a
| few hundred bucks in low quantities?
|
| Larger sensors tend to use SLVS-EC interfaces rather than
| MIPI CSI used in the Raspberry Pi. The Raspberry Pi doesn't
| even support full 4-lane MIPI-CSI (except on the CM4). It's
| limited to 2-lane MIPI-CSI.
| JKCalhoun wrote:
| I agree, it would be nice, but is there no way for you or me to
| construct such a thing using some existing chipset or module
| and constructing an interface to the Raspberry Pi?
| ajsharp wrote:
| this is amazing :)
| mattowen_uk wrote:
| I toyed with this idea, as I find taking pictures with my phone
| to be an unsatisfactory experience, and carrying around my Canon
| EOS is annoying as it's too bulky.
|
| What stopped me was: 1) Raspberry PI boot-up time. It's long
| enough to prevent you from quickly snapping a picture when you
| see it - you have to be prepared. 2) Battery power that doesn't
| run down within a couple of days of non-use.
| bduhan wrote:
| Boot times of 3-4 seconds are achievable with a customized
| buildroot [1] [2] if you don't need network, USB, HDMI, and
| other services.
|
| [1] https://mitxela.com/projects/thermal_paper_polaroid
|
| [2] https://himeshp.blogspot.com/2018/08/fast-boot-with-
| raspberr...
| abdullahkhalids wrote:
| As a prof seeings students waste time scanning their homework,
| one gadget I want to build is a easy to use scanner, with a Rpi
| Zero and a cheap camera.
|
| The idea is to have the camera with a wide angle lens attached to
| the top of stack of papers/notebook. Pressing a button takes a
| picture, and then does a affine transform (?) on it get the
| perspective right, then uploads it to the LMS.
|
| Just a clean, hassle free experience. No orienting your phone
| awkwardly, no getting the lighting right, no mini edits on your
| phone, no compiling pdfs.
|
| Also, very useful for me, as I like to do math by hand.
|
| Edit: Image https://imgur.com/Fb45H7M.png The fact that camera is
| fixed relative to paper means the transform is also fixed. Multi-
| colored led (and knowledge of paper color) can also fix lighting.
| akeck wrote:
| Towards the end of my math degree, I started doing written
| homework assignemnts in Inkscape using the pen tool and a Wacom
| tablet. It worked surprisingly well.
| hrktb wrote:
| Phone scanners are already there.
|
| Auto scanning with border and angle detection works decently
| well [0], mini tripods with phone brackets abound. It's very
| easy to set a phone above the table at a slight angle (that
| makes it easier to move the docs in and out and get rid of
| shadows) with the app auto scanning every sheet that's laid
| below.
|
| [0] I used Scanner Pro by Readle, on iOS for reference
| abdullahkhalids wrote:
| Funny how an Apple consumer is advocating for a "fiddly"
| solution. I only use linux, but I was actually inspired by
| the Apple philosophy in this. A one-button, no-nonsense
| solution.
| ska wrote:
| They work ok, but are fiddly. I think OP is looking for
| something more bulletproof with a better workflow.
|
| Come to think of it a frame with a black base and an overhead
| light incorporating a phone holder would likely do the trick
| well.
| abdullahkhalids wrote:
| It will technically work. But do you think a student who
| still wants to appear "cool" is going to whip out the
| contraption you mention in front of their peers? There is
| more to solutions to problems than the technological
| possibilities.
| ska wrote:
| Sure, but that applies at least as much to the original
| solution.
|
| And this seems more of a 'on my desk at home' sort of
| problem space than a 'whip it out of my bag' sort.
| porknubbins wrote:
| Having built a lot of rpi projects bulletproof is the last
| word that comes to mind though. I mean the software end is
| usually fine if the sd card doesn't get corrupted but
| building physically robust devices is a serious challenge.
| tga wrote:
| Just in case someone didn't know this and finds it useful:
| the system Files app on iOS can also scan documents to PDF,
| including perspective correction. I believe the Notes app can
| do that too.
| spaceisballer wrote:
| The notes app can definitely do this and works quite well.
| It's never worth the trouble of taking out my scanner
| anymore. If you have decent lighting and a contrasting
| background for the document it almost never requires
| refining for me.
| LegitShady wrote:
| I have thousands of photos of homework from when I was in
| school stored in Google photos. I always took pictures as a
| backup but the stuff I submitted I always scanned using a real
| scanner because it was hard to get a perfectly parallel photo
| with good lighting.
| enchiridion wrote:
| I believe it would a homography transform, which is less
| constrained than an affine transform, as it does not preserve
| parallel lines/angles. Instead it maps lines to lines as a way
| to adjust perspective.
|
| https://en.wikipedia.org/wiki/Homography
| vanderZwan wrote:
| Open Note Scanner does this quite well on Android, in my
| experience.
|
| https://github.com/allgood/OpenNoteScanner
|
| https://f-droid.org/en/packages/com.todobom.opennotescanner/
|
| https://play.google.com/store/apps/details?id=com.todobom.op...
| abdullahkhalids wrote:
| Yes, phone apps work, but they still require several clicks
| to get things right, and upload. But if your camera is fixed
| relative to the paper, then there is a single known transform
| that will correct perspective. If you write software to
| integrate directly with the LMS, then it will only require
| one hardware button press per page, to upload the assignment.
| ska wrote:
| Really the transform isn't as much trouble as getting a
| uniformly lit area with good contrast.
| abdullahkhalids wrote:
| Yes, that could be problematic, hence I incorporated the
| LED in my proposal image.
|
| As we are working with standard paper, we know its color
| (as it appears to the camera in neutral light). We could
| have a calibration step, where the multicolored LEDs are
| tuned to get the right contrast and color balance.
| Though, I have no idea how well it will work in practice.
| [deleted]
| jjeaff wrote:
| Seems like to get it to work at such a sharp angle, you
| would need a very large depth of field with your lense in
| order to keep both the nearest and farthest portions of the
| page in focus.
| abdullahkhalids wrote:
| I do have a phd in a theoretical quantum optics, so no, I
| have no idea if such a weird angle will actually work in
| practice given the physical and budgetary constraints.
| :-D
|
| Seriously, though, I have idea. We can take two pictures
| focusing once the near part, and once on the far part.
|
| If cameras are cheap (I haven't researched), maybe two on
| either end of the device would mitigate the complexity of
| the lenses required.
| spoonjim wrote:
| Might be useful in a place where no one has smartphones but
| otherwise why not use the smartphone camera that people already
| have?
| tootie wrote:
| I do scanning to PDF just with Google Drive on my phone. You
| can also buy (or DIY) a scanning box like this guy:
| https://smile.amazon.com/Scanner-Bin-Document-Scanning-Solut...
|
| I've seen models that also have LED strips for even lighting.
| What I haven't seen is a gadget that can feed multiple sheets
| easily.
| jimbob45 wrote:
| Do you not accept phone pictures of homework? That's what I
| used to submit and the clarity was enough for TAs to be able to
| readily spot mistakes.
| abdullahkhalids wrote:
| Of course I do. But students are probably taking like 50
| pictures a week for their various courses. I don't think they
| like the tediousness of it.
|
| Plus with this, I could look at student solutions much easier
| during class or office hours.
|
| Similarly, I don't want to whip out my phone to take 30
| pictures of my research notes one by one.
| brudgers wrote:
| A module on making pictures with the phone would have fewer
| dependencies. Most of the problem is simply not understanding
| the problem space. Humans have had less than two hundred years
| dealing with it and only a decade or so since everyone had a
| camera in their pocket all the time and about a year of
| scanning photographs for academia.
| JKCalhoun wrote:
| Notes that ships with iOS actually has a nice document scanner
| built in that uses the phone camera ... I mean it does the
| transform you describe to get better-than-normal document
| photos.
|
| Too bad it then simply adds as an attachment to the note and
| doesn't allow you to go straight to Share.
| brundolf wrote:
| There are other apps that do similar things. When I was in
| college a decade ago I was using "CamScanner", which seems to
| still be around (though I feel like I read recently that it
| got bought and the new owners started doing something
| sketchy)
|
| These days I just use the regular camera app. Documents are
| plenty readable as-is, and you can straighten/adjust 3D
| perspective/raise contrast using the regular photo editing
| features (at least in iOS)
| mlyle wrote:
| Clearscanner on the phone does this -- my kids use it for their
| homework. Snaps pictures, finds edges, does affine transform,
| corrects exposure, and assembles into PDF.
| sneak wrote:
| I went into the app store to see about this app, having not
| heard about it yet. The app's privacy policy says it uses
| Firebase (Google) Analytics, which transmits information
| about your use of the app off the device without consent.
|
| This, to me, means I can never trust it for scanning
| sensitive or private documents, because who knows what it's
| sending. I declined to install it. YMMV.
| mlyle wrote:
| This is in the context of scanning homework assignments.
|
| Not to mention-- Firebase tracks what, events? You think
| somehow it's encoding the documents in an event stream to
| exfiltrate them?
| sneak wrote:
| An app that shares my event data silently and without
| consent cannot be trusted with even low-grade private
| information. Why would I ever allow it on a device that
| handles high-grade private information?
| mlyle wrote:
| > An app that shares my event data silently and without
| consent
|
| You're complaining about a -disclosed- use of analytics.
|
| It seems like you'd be happier with an app that just
| didn't mention the use.
| jjeaff wrote:
| It's not without consent nor is it silently. You consent
| when you decide to install it and it's not silently if
| they just told you that it happens.
| StavrosK wrote:
| Can you not just block its internet connection?
| sneak wrote:
| Not conveniently on iOS.
| StavrosK wrote:
| Ah, that's unfortunate.
| snthd wrote:
| You might like OpenNoteScanner
| https://github.com/allgood/OpenNoteScanner
| yoloswagins wrote:
| I would love to see a guide to fitting an rpi camera module into
| a film camera back, to bring old film cameras into the modern
| age.
| CloselyChunky wrote:
| During the quarantine, I started photographing on film,
| developing the film at home and digitize the negatives using my
| DSLR. At least for B/W film, the process of developing film
| yourself is dead easy and I'm happy to have a hobby away from
| my computer. Also, having a price per picture and only a
| limited amount of shots helps me actually think about composing
| nice pictures instead of taking 5 almost identical images and
| moving on.
|
| In general, film photography is having a comeback. Prices for
| used film cameras skyrocketed in the last years for a few
| models.
|
| Personally, I find photographing on film really rewarding.
| Having a physical product in the end (be it a print of the
| image or only the negatives) makes the process more enjoyable.
| So if you have some old film cameras lying around, I can only
| recommend giving them a try. Maybe there are even old films
| with old memories in these cameras.
| fish_phrenology wrote:
| I was thinking about this yesterday while looking for resources
| on building a board to read data from a modern sensor from
| something like an a7 (turns out its way over my head). The
| issue you'd run into with the pi hq camera module assuming you
| can get the focal plane right and everything to fit is that the
| sensor is way smaller than 35 film so you'll have a rather
| large crop factor.
| brudgers wrote:
| The issue is the difference in "sensor" size. The "crop factor"
| of the rPi camera is 5.5 so a 50mm lens provides an angle of
| view equivalent to a 275mm lens for 35mm film.
|
| To get down into "normal" lens equivalent would require
| something like 8mm. A fisheye would probably be ok because the
| center tends to be relatively less distorted. But if there are
| 8mm rectilinear lenses for 35mm film cameras you probably can't
| find one and maybe not afford one...Its price would buy a lot
| of film.
|
| I mean there are digital sensors that retrofit film cameras.
| Products for Hasselblad 500 series and Mamiya RB have been
| around since the early days of digital. They have always been
| less than $100k and still are today.
|
| Anyway if you want to use an old film camera, just buy some
| film and have a go. They are incredible mechanical devices and
| a pleasure in the hand and produce that film look naturally.
| throwanem wrote:
| It would have to vary pretty heavily by film camera model, and
| many probably can't be nondestructively modified that way.
| Nikon F and whatever Canon's film flagships were, sure - those
| are designed to take a motor drive winder, so you can remove
| the back cover entirely. But my heirloom Nikkormat FTn, for
| example, wasn't designed that way, and removing the film cover
| hinge pin would at best be a very fiddly task with a
| significant risk of damaging the hinge.
|
| That said, and assuming you use a camera module that you can
| disassemble far enough to expose the sensor, it shouldn't be
| too hard. You'd most easily I think design and 3D-print a
| replacement cover with a light-tight fitting to place the
| sensor on center at the flange focal distance (ie in the
| designed film plane), and route whatever cables out to where
| you could connect them. Maybe also a case for the Pi that has a
| 1/4"-20 screw to mount on the tripod socket, just so you don't
| have to cram your face past it to get a good look down the
| viewfinder.
|
| You'd probably have a hard time getting anything like a wide-
| angle shot. I don't know offhand what sensor sizes are common
| in RPi camera modules, but I feel like expecting 1"-class would
| be expecting too much, so you'd be dealing with a pretty fierce
| crop factor.
| dheera wrote:
| I use film camera lenses all the time on my full-frame consumer
| digital camera, which is at present a slightly better way to
| bring 35mm film camera _lenses_ back into the modern age.
|
| The problem with retrofitting a film camera back with a Pi
| camera is that the Pi camera has a dinky little IMX477 sensor
| which only covers a small, small fraction of the area that
| would normally be illuminated on 35mm film, so you would not
| get very good images at all.
|
| If they came out with a full-frame sensor that plugged into the
| Pi though, that would be _awesome_.
|
| That said -- that's for 35mm cameras. Now there are also other
| film cameras ... I am working on using a Pi camera to scan a
| _large format_ 4x5 area to bring a Toyo view camera back into
| the modern age :). It takes a good 15-20 minutes to scan the
| image and I get gigapixel results. Still a work in progress.
| Un-doing the effect of CRA optimization on the sensor 's
| microlens array is annoying.
|
| https://www.instagram.com/dheeranet.large/
| JKCalhoun wrote:
| Cool. I remember when flatbed scanners were pressed into
| service to make (very) large format images.
|
| Stephen Johnson was playing around with this in the 1990's.
|
| http://www.betterlight.com/field_photography.html
|
| "I initially captured 180 degrees of view in a 6,000 x 40,055
| pixel image, but soon learned that Photoshop was limited to
| opening files with less than 30,000 pixels in either
| dimension, so I had to perform surgery on the original TIFF
| file to reduce the image to just under this limit."
| dheera wrote:
| I thought about that method as well and after taking apart
| about 3 scanners it stopped being fun. Scanner assemblies
| are _really_ hard to work with. Especially that some of
| them strobe colored RGB lights instead of a colored sensor,
| some use microlenses, and some won 't start scanning if
| they detect that the light has failed (and you don't want
| the light for photography, so you disconnect the lights but
| then find that it refuses to scan). However if there's a
| hackable linear color CCD that is 4 inches long that I can
| wire into a RPi that might be super interesting.
| fish_phrenology wrote:
| Now that is a neat idea. I was thinking about making a film
| scanner that can auto scan + cut rolls of 120 and 35 but this
| is way neater. Thank you for sharing!
| jrussino wrote:
| Is there a solid open-source Rpi-based home security camera
| solution yet? I'd like to set up something of comparable quality
| to say a Ring doorbell camera or a Nest/Blink security cam or a
| baby monitor but that I can fully control.
| varispeed wrote:
| I've been thinking about just getting off the shelf system like
| Hivision IP camera and NVR, then run it on a separate network
| disconnected from internet. It shouldn't be much more
| expensive, but still I'd probably disassemble cameras to make
| sure there is no wifi of other means to leak data.
| markfchapman wrote:
| I'm thinking of looking at this...
|
| https://github.com/ccrisan/motioneyeos
|
| ...has anyone used it?
| jjeaff wrote:
| Not rpi, but I think there seems to be a pretty solid system
| built up around the esp32-cam devices using esphome, which are
| actually quite a bit cheaper and lower power than rpi.
|
| https://home-assistant-guide.com/2020/10/08/building-a-video...
| buran77 wrote:
| Have you looked at motionEyeOS? I'm not sure how it compares to
| Nest/Blink but I got along very well with it since 2015
| (originally as motionPie).
|
| https://github.com/ccrisan/motioneyeos
| cvwright wrote:
| That's been a dream of mine for a long time. I don't think
| there's anything quite like we want just yet.
|
| However, there is a super cool open source project from the
| author of GKrellM (remember that from the ancient days of
| Linux?). He's using the Pi's built-in hardware video coder to
| get high quality motion detection very cheaply. The basic idea
| seems to be, when the encoder produced a lot of bits, there
| must have been some motion in the frame.
|
| https://github.com/billw2/pikrellcam
| tonmoy wrote:
| I set up a reolink PoE camera with a PoE injector connected
| directory to a RPi. The RPi itself is connected to the Wifi and
| I have homeassistant running on it and the camera itself can
| generate an event when it detects a motion that homeassistant
| can do stuff with. I am pretty happy with this solution.
| paxswill wrote:
| I briefly used Kerberos.io a few years ago (kind of a difficult
| name SEO-wise), and it seemed to work pretty well.
| rubatuga wrote:
| Just buy a used Lumix GF2
| augbot wrote:
| There are c-mount to Canon EOS lens adapters. Could take this
| project to the next level!
| graiz wrote:
| I tried this with little success. The c-mount is such a cropped
| sensor that even with the EOS lens adapter you only get the
| middle of the shot... also I haven't found a good solution for
| focus and f-stop that is buried inside the EOS pin protocol.
| I'm sure it's solvable but haven't found it yet.
| daveslash wrote:
| This may be a dumb question, but I haven't borked around with the
| Pi Camera at all yet.... Why does the lens have a megapixel
| rating? I'd assume that there's no imaging sensor in it, right?
| [deleted]
| PragmaticPulp wrote:
| > Why does the lens have a megapixel rating? I'd assume that
| there's no imaging sensor in it, right?
|
| The megapixel rating is an indicator for sharpness. There are
| more technical ways to rate sharpness, but listing the
| megapixel rating and sensor size is a quick way to suggest that
| the lens is sharp enough to resolve pixels that small.
| throwanem wrote:
| It doesn't make sense, no. The whole article seems very
| barebones - I'd have expected to see discussion of how the
| sensor-lens system needs to work for proper focus, at least.
| Granted they link the STL for their case, which will be
| designed for correct alignment, but some discussion would still
| be useful to those wanting to mod for different lenses or
| sensors.
| dheera wrote:
| The lens having an MP rating is likely just saying that the
| optics is good enough to resolve an image to the detail that a
| 10MP sensor would capture.
|
| I know it's a shitty way to specify lens resolution, but that's
| likely what the manufacturer called it, not the fault of the
| article's author.
| daveslash wrote:
| Thank you. That makes sense. Yes - that's the description
| from the manufacturer, not the post author. Lens may be found
| here. https://www.adafruit.com/product/4562
| brudgers wrote:
| The rPi camera accepts c-mount lenses. C-mount is a mechanic
| standard for the connecting threaded couple of lens and camera.
|
| It is not an optical standard.
|
| C-mount lenses project image circles of different sizes
| depending on their intended use. The initial use was 8mm film
| cameras. But it was also used by lenses designed to cover the
| larger super8 film image standard. And today there is at least
| one c-mount lens that can nominally cover APS-C though with
| noticeable vignette...anyway...
|
| The rPi camera sensor has a diagonal of 7.9mm. This is about
| 20% larger area than super8 film.
|
| For a photographer whose opinions of image quality revolve
| around technical details, such a super8 format intended lens
| might produce about 10 "acceptable" megapixels on a 12mp
| sensor.
|
| Most photographers tend to think about image quality in those
| terms. Limiting the specifications that way heads off
| complaints about unfulfilled expectations. It is easier to hold
| strong opinions about technical measures than to consider
| aesthetic possibility created by a lens' optical limitations.
| playpause wrote:
| Good question. It looks like the Raspberry Pi HQ camera module
| (the bit with the sensor) is rated at 12MP. My guess is that
| the angle of this lens means you can only make use of the
| middle portion of the sensor, in this case 10MP's worth of it.
| And as there's only one sensor module on the market that this
| lens can screw onto, they can tell you the effective megapixel
| rating of the lens. There's also a 'wide angle' 6mm lens [1]
| available for the same camera module, rated at 3MP, which I
| assume casts the image on a even smaller portion of the sensor.
| I could be completely wrong though, not an expert.
|
| [1] https://thepihut.com/products/raspberry-pi-high-quality-
| came...
| JKCalhoun wrote:
| I don't think you are correct. For this reason only: I have
| played with the Raspberry Pi HQ camera module and a pair of
| lenses for it and the frame-grab software never returned an
| image with a black (or otherwise) border. From your
| description I would instead expect a thick black border
| around the image where no photon data was captured.
|
| To be sure the frame-grab tool could be sensing the lightless
| border from the image and cropping, but I doubt it's that
| clever.
| brudgers wrote:
| Your description of the frame grab software output is
| consistent with the proposed degree of cleverness.
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