3 ms·

OpenCV and the Wild Kingdom

68 points by zdw 2y ago

VoidWhisperer 2y ago
Site doesn't actually seem to load (SSL protocol Error)
- from-nibly 2y ago
  Loading now. (At least for me)
  - VoidWhisperer 2y ago
    Just figured it out was not loading because of my antivirus (malwarebytes).. while virustotal doesn't flag the domain name, the ip it is hosted on is flagged as malicious/a trojan[0]. The IP is on Namecheap's ASN so evidently at some point the ip was used by someone to host malicious files. [0]: https://www.virustotal.com/gui/url/8d8ed17d3e28dc16fc10b6d762e7c8b39bc1f48dab8a2a0a2029c1e271fedef6 https://www.virustotal.com/gui/url/8d8ed17d3e28dc16fc10b6d76...
lloydjones 2y ago
Excellent! I wonder how difficult it would be to detect specific actions in the video frames, like “cat eating food”?
- pbmonster 2y ago
  A dynamically detected bounding box (cat) overlapping with a predefined bounding box (bowl) would be less than 50 lines of python if you use openCV. Discriminating raccoons and cats would probably be another 50 lines if you use some pre-trained ML model. Adding an electric scale to the bowl would certainly cut down the false positive rate you're going to get (from the cat, safe to say the raccoon will always be eating if it overlaps the bowl).
VMG 2y ago
For those wondering, the "FLIR Boson" camera is around $900 on eBay
- stefan_ 2y ago
  If you don't want to pay quite that much, you can get cheap thermal cameras from China e.g. from InfiRay. They just show up as a UVC camera.
begueradj 2y ago
I can't read the article. Getting below error: "503 Service Unavailable No server is available to handle this request. "
pmontra 2y ago
https://archive.is/20240723031436/https://scottsexton.co/post/opencv_wild_kingdom/ https://archive.is/20240723031436/https://scottsexton.co/pos...
rurban 2y ago
I've build a water fountain for my cats a year ago, with a simple cheap motion sensor (3€ AliExpress). They prefer running water over everything, so it works great. The only real enemy, neighbors black cat, is locked out.
hi_hi 2y ago
I'm looking for a way to run a simple motion detector (as in physical motion using a gryoscope device) and have this notify me somehow that motion has occured. The bit I get stuck on is how to enable connectivity so it can notify me from a remote position with no access to wifi or wired network. I would love for this thing to consume minimal power too, so I only have to recharge the battery once per week (for example, this might not be possible, or maybe something much better is possible, i have no idea) The most convenient option I can think of is a cheap smartphone with 3g/4g data connection that can somehow integrate with the motion sensor and enables me to write some code to send a message. There must be something better suited to this though. Thoughts welcome.
- hurtuvac78 2y ago
  What's the distance you need to cover ? BLE use very little power, is wireless, can go 100m or so, max.
- buescher 2y ago
  The Nordic Thingy dev platform is available in both Bluetooth Low Energy Long Range and cellular versions. It has everything you need. More expensive than a cast-off cell phone for a one-off though.
- tastyfreeze 2y ago
  LoRa mesh network is another option. I've considered BTLE and LoRa for a sensor network I have been planning.
- axegon_ 2y ago
  If I understand correctly, I feel like OpenCV and computer vision is a huge overkill for something like that. Here are a few thoughts: 1. A microcontroller with a LoRa module and a motion sensor will get you a long way and it will consume little to no power. That said, you also need to make sure you have a device to either read the signal or someone in a radius of 4 to 6km is hosting a lorawan gateway. If not, I'm sure people will be grateful if you set up one yourself - to my mind it's worth it and I happen to be the only person that hosts one and covers my area of the city. Just make sure you don't enable any of the other gimmicks the microcontroller might come with - wifi, bluetooth or whatever. For instance I have a bunch of these [1] and they seem like they would do the trick for you if you pair them with a motion sensor. I need to warn you though, the documentation is appalling. 2. If you do wanna go CV - you can but it will never be low power and you will need to figure out some connectivity. If it's a raspberry pi or some other SBC with GPIO, you could of course hook up lora to it. As for the CV itself - opencv will get you there or you could train a very small yolo-like neural network - if you control the environment/lighting and they are static, you only need a handful of sample images to train it and you will get great accuracy. Like even something in the very low double digits will do the trick. Imo that would be overkill and your best bet is still the first option. [1] https://www.lilygo.cc/en-bg/products/lora3 https://www.lilygo.cc/en-bg/products/lora3

68 points by zdw 2y ago

VoidWhisperer 2y ago

Site doesn't actually seem to load (SSL protocol Error)

from-nibly 2y ago
Loading now. (At least for me)
- VoidWhisperer 2y ago
  Just figured it out was not loading because of my antivirus (malwarebytes).. while virustotal doesn't flag the domain name, the ip it is hosted on is flagged as malicious/a trojan[0]. The IP is on Namecheap's ASN so evidently at some point the ip was used by someone to host malicious files. [0]: https://www.virustotal.com/gui/url/8d8ed17d3e28dc16fc10b6d762e7c8b39bc1f48dab8a2a0a2029c1e271fedef6 https://www.virustotal.com/gui/url/8d8ed17d3e28dc16fc10b6d76...

lloydjones 2y ago

Excellent! I wonder how difficult it would be to detect specific actions in the video frames, like “cat eating food”?

pbmonster 2y ago
A dynamically detected bounding box (cat) overlapping with a predefined bounding box (bowl) would be less than 50 lines of python if you use openCV. Discriminating raccoons and cats would probably be another 50 lines if you use some pre-trained ML model. Adding an electric scale to the bowl would certainly cut down the false positive rate you're going to get (from the cat, safe to say the raccoon will always be eating if it overlaps the bowl).

VMG 2y ago

For those wondering, the "FLIR Boson" camera is around $900 on eBay

stefan_ 2y ago
If you don't want to pay quite that much, you can get cheap thermal cameras from China e.g. from InfiRay. They just show up as a UVC camera.

begueradj 2y ago

I can't read the article. Getting below error: "503 Service Unavailable No server is available to handle this request. "

pmontra 2y ago

https://archive.is/20240723031436/https://scottsexton.co/post/opencv_wild_kingdom/ https://archive.is/20240723031436/https://scottsexton.co/pos...

rurban 2y ago

I've build a water fountain for my cats a year ago, with a simple cheap motion sensor (3€ AliExpress). They prefer running water over everything, so it works great. The only real enemy, neighbors black cat, is locked out.

hi_hi 2y ago

I'm looking for a way to run a simple motion detector (as in physical motion using a gryoscope device) and have this notify me somehow that motion has occured. The bit I get stuck on is how to enable connectivity so it can notify me from a remote position with no access to wifi or wired network. I would love for this thing to consume minimal power too, so I only have to recharge the battery once per week (for example, this might not be possible, or maybe something much better is possible, i have no idea) The most convenient option I can think of is a cheap smartphone with 3g/4g data connection that can somehow integrate with the motion sensor and enables me to write some code to send a message. There must be something better suited to this though. Thoughts welcome.

hurtuvac78 2y ago
What's the distance you need to cover ? BLE use very little power, is wireless, can go 100m or so, max.
buescher 2y ago
The Nordic Thingy dev platform is available in both Bluetooth Low Energy Long Range and cellular versions. It has everything you need. More expensive than a cast-off cell phone for a one-off though.
tastyfreeze 2y ago
LoRa mesh network is another option. I've considered BTLE and LoRa for a sensor network I have been planning.
axegon_ 2y ago
If I understand correctly, I feel like OpenCV and computer vision is a huge overkill for something like that. Here are a few thoughts: 1. A microcontroller with a LoRa module and a motion sensor will get you a long way and it will consume little to no power. That said, you also need to make sure you have a device to either read the signal or someone in a radius of 4 to 6km is hosting a lorawan gateway. If not, I'm sure people will be grateful if you set up one yourself - to my mind it's worth it and I happen to be the only person that hosts one and covers my area of the city. Just make sure you don't enable any of the other gimmicks the microcontroller might come with - wifi, bluetooth or whatever. For instance I have a bunch of these [1] and they seem like they would do the trick for you if you pair them with a motion sensor. I need to warn you though, the documentation is appalling. 2. If you do wanna go CV - you can but it will never be low power and you will need to figure out some connectivity. If it's a raspberry pi or some other SBC with GPIO, you could of course hook up lora to it. As for the CV itself - opencv will get you there or you could train a very small yolo-like neural network - if you control the environment/lighting and they are static, you only need a handful of sample images to train it and you will get great accuracy. Like even something in the very low double digits will do the trick. Imo that would be overkill and your best bet is still the first option. [1] https://www.lilygo.cc/en-bg/products/lora3 https://www.lilygo.cc/en-bg/products/lora3