by maxshm on 11/29/21, 3:40 PM with 49 comments
by maxshm on 11/29/21, 8:18 PM
https://www.jvsg.com/calculators/cctv-lens-calculator/
It is a web app (Javascript+React) that runs in a browswer or on a tablet or a smartphone.
It took our team more than 1 year to complete the calculator.
Calculator functions:
- calculate pixel density (PPM/PPF)
- clearly see dead zones in 3D
- check DORI zones (detection, observation, recognition, identification) based on pixel density calculations and IEC and EN 62676 standard.
- calculate lens focal length
- load a floor map to see camera coverage on your plan
- over 9,000 video surveillance camera models embedded in the CCTV Lens Calculator.
- 12 languages supported.
Today we launched our Security Camera Lens Calculator also on ProductHunt.
We would love to get some feedback. Particularly from people using it to solve real world problems.
by GistNoesis on 11/29/21, 6:49 PM
The following is commentary for the web app cctv-lens-calculator (not the whole software).
For face recognition applications, taking the picture from a camera too high make the face harder to recognize (even more so when people look down); (And the portrait of the person doesn't show the rotation).
Some camera have both horizontal rotation and vertical rotation, and depending on whether you mount it on the wall or on the ceiling, and the camera model (and their axis-rotation order), the field of view and the up vector may not be up.
Add affiliate links to buy the chosen camera model.
Add multiple cameras and their respective field of view to check for blind spots.
Allow loading sketch-up or 3d model of the building (I couldn't find how to "load a floor map to see camera coverage on your plan" )
Bug : Clicking on the "Meter" button scale the person up indefinitely.
by buro9 on 11/29/21, 4:59 PM
Meaning... OK, so you're going with a Sony and you want a prime lens and you'll be x distance from the camera and want to be frame with head and shoulders... which prime lens is the one you should choose?
For a single camera + lens you'd probably experiment and a shop can rent you variations. But as soon as you're into the "I'm setting up a home studio and need several cameras" then you'd want to spend less time experimenting and get closer to the final configuration on the first pass, i.e. to use a tool to help get it right first time.
by azalemeth on 11/29/21, 4:44 PM
by jaclaz on 11/29/21, 4:52 PM
>Calcolare la lunghezza focale dell obiettivo della fotocamera, la densità dei pixel e vedere le zone della fotocamera in 3D
In actual Italian that would be:
Calcolo della lunghezza focale dell'obiettivo della fotocamera, della densità dei pixel e visualizzazione 3d delle zone di copertura
The current one is understandable, but sounds a bit like native americans talk in old westerns.
And - if I may - you have colours "reversed", I would instinctively expect green to be "good, OK", red "No good", yellow something midway.
by bmcahren on 11/29/21, 5:19 PM
Worst resolution = Red/Orange
Acceptable resolution = Yellow
Best resolution = Green/Blue
by scottlamb on 11/29/21, 8:39 PM
Since this discussion is attracting IP camera-savvy folks...I'm struggling to find cameras to buy/recommend. In particular, ones that:
* Aren't made by the big Chinese companies (Dahua, Hikvision, Uniview, Huawei) that are actively participating in the Uyghur genocide [1] and/or are considered a security threat by the US. (Most of those are banned for US government installations by the National Defense Authorization Act [2]; future models won't get FCC approval for private use either, according to the Secure Equipment Act of 2021 [3].)
* Support direct RTSP use rather than require a fast/reliable Internet connection and/or proprietary cloud service subscription. (This excludes eg the Nest and Ring stuff, as far as I can tell.)
* Are reasonably priced, although not necessarily as cheap as the Chinese vendors.
* Have decent night image quality. I'd be thrilled to find a model with the larger 1/1.8" sensors.
I know I should renew my IPVM subscription and see what they say. I'd love to find (other) quality review sites or forums that aren't super invested in Dahua/Hikvision (like ipcamtalk seems to be).
[1] eg https://ipvm.com/reports/dahua-uyghur-warning
[2] https://ipvm.com/reports/ndaa-guide
[3] https://www.cepro.com/security/senate-passes-secure-equipmen...
by mtmail on 11/29/21, 3:41 PM
by daenz on 11/29/21, 6:27 PM
One small bit of feedback, the installation height doesn't impact the rendered person. I was expecting the rendered person to be a 3D model that was rasterized into the target resolution, but when I put the camera nearly overhead, it doesn't show primarily the top of the model's head, it still shows a mostly frontal view.
by maxshm on 11/29/21, 5:13 PM
by CTDOCodebases on 11/30/21, 5:25 AM
by pseudosavant on 11/29/21, 9:57 PM
by Gys on 11/29/21, 4:34 PM
One thing: the left side menu is not scrollable but should be? On my MacBook Pro with Firefox 94.0.2 I see 'FOV Width' at the left bottom and I assume there is an input field below it, but I cannot see it.
by sirmoveon on 11/29/21, 5:40 PM
by fennecfoxen on 11/29/21, 4:51 PM
by emmelaich on 11/30/21, 3:45 AM
by linux_is_nice on 11/29/21, 6:42 PM
by kingcharles on 11/30/21, 1:50 AM
by atum47 on 11/29/21, 11:21 PM